K-TEK AccuTrak AT100 User manual

AT100-0200-1 Rev L (10-2010) DCN0528 2
TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................................................... 4
2.0 STORAGE INFORMATION .............................................................................................................................. 5
3.0 INSTALLATION AND BASIC WIRING............................................................................................................. 5
3.1 All Installations ............................................................................................................................... 5
3.1.1 Compression Fittings ............................................................................................................ 5
3.1.2 Floats .................................................................................................................................... 5
3.1.3 Transmitter Housing Height .................................................................................................. 5
3.2 Stilling Probes ................................................................................................................................ 5
3.2.1 Assembly Instructions for F1 Flexible Probes ....................................................................... 6
3.3 Loop Wiring.................................................................................................................................... 6
3.4 Jumper Settings ............................................................................................................................. 6
4.0 TRANSMITTER CALIBRATION AND SETUP ................................................................................................. 7
4.1 Level Output Calibration ................................................................................................................ 7
4.1.1 Calibration Using the Pushbuttons........................................................................................7
4.2 Reversing Action ............................................................................................................................ 7
4.2.1 Reverse Action Calibration Using the Pushbuttons ..............................................................7
4.3 Damping......................................................................................................................................... 7
4.4 Calibration Using the LCD Setup Menu......................................................................................... 9
4.5 Selecting a Primary Variable (PV) ................................................................................................. 9
4.6 Selecting an Engineering Unit for Measurement (EUN) .............................................................. 10
4.7 Level Offsets (L1O and L2O) ....................................................................................................... 10
4.8 DAC Trim ..................................................................................................................................... 10
4.9 Temperature Output..................................................................................................................... 10
4.9.1 Selecting the Unit of Temperature (EUN TEMP) ................................................................10
4.9.2 Temperature Output Calibration.......................................................................................... 11
4.9.3 Temperature Reset (TMP RSET)........................................................................................ 11
4.9.4 Temperature Master Calibration ......................................................................................... 11
4.10 Volumetric Strapping.................................................................................................................. 12
4.10.1 How the Strapping Table Works ....................................................................................... 12
4.10.2 Setting Up (or resetting) the Strapping Table.................................................................... 12
4.10.3 Selecting the Input Mode (Automatic or Manual) ..............................................................12
4.10.4 Setting Up Strapping Table Points .................................................................................... 13
4.10.5 Notes on Strapping Table Usage ...................................................................................... 13
4.10.6 Saving/Loading a Strapping Table ....................................................................................13
4.10.7 Setting Current Output Based on Volume......................................................................... 13
4.11 Alarm Delay ........................................................................................................................................14
4.12 Custom Current Ranging ............................................................................................................ 14
4.12.1 Description and Method of Operation ................................................................................14
4.12.2 CCR Set Up .......................................................................................................................14
5.0 COMMUNICATION OPTIONS........................................................................................................................ 15
5.1 Hart Protocol Interface Option ..................................................................................................... 15
5.1.1 Using a 268/275/375 Rosemount Communicator or Equal................................................. 15
5.2 Honeywell DE Protocol ................................................................................................................ 15
5.2.1 Interoperability and Conformance Class .............................................................................15
5.2.2 Operating Modes................................................................................................................. 15
5.3 Foundation Fieldbus .................................................................................................................... 16
5.3.1 Topology ............................................................................................................................. 16
5.3.2 Electrical Considerations..................................................................................................... 16
5.3.3 Field Wiring ......................................................................................................................... 17
5.3.4 Jumper Settings ..................................................................................................................17
5.3.5 DD Files .............................................................................................................................. 17
5.3.6 Transducer Block ................................................................................................................ 17
5.3.7 Al Function Blocks............................................................................................................... 17

AT100-0200-1 Rev L (10-2010) DCN0528 3
TABLE OF CONTENTS (continued)
5.3.8 PID Blocks ........................................................................................................................................18
5.3.9 Link Active Scheduler / Back-up LAS.........................................................................................18
5.3.10 Threshold Adjustment ..............................................................................................................18
5.3.11 Sample Configurations .............................................................................................................18
6.0 SAFETY, MAINTENANCE, & TROUBLESHOOTING....................................................................................19
6.1 Personnel Qualifications...............................................................................................................19
6.2 Required Tools .............................................................................................................................19
6.3 Suggested Proof Test...................................................................................................................20
6.4 Safety Inspection ..........................................................................................................................20
6.4.1 Float Inspection .............................................................................................................20
6.4.2 Sensor Inspection..........................................................................................................21
6.4.3 Transmitter Testing .......................................................................................................21
6.4.4 Output Checkout ...........................................................................................................21
6.5 4-20mA, HART Transmitters ........................................................................................................23
6.6 Foundation Fieldbus Transmitters................................................................................................24
6.7 Verify Proper Power Up of the Transmitter ..................................................................................25
6.8 Verify Current Output Stability......................................................................................................25
6.9 Threshold Adjustment ..................................................................................................................26
6.10 Module Replacement .................................................................................................................26
6.11Terminal Strip Checkout...............................................................................................................26
6.12Threshold Adjustment Using an Oscilloscope..............................................................................27
7.0 NAMETAG INFORMATION ............................................................................................................................28
8.0 WIRING DIAGRAMS .......................................................................................................................................29
8.1 FM/CSA ........................................................................................................................................29
8.2 ATEX/IEC .....................................................................................................................................31
8.3 Typical Loop Wiring Diagram .......................................................................................................33
8.4 Loop Powered TX Hookup /RI Dual Compartment Housing ........................................................34
8.5 Temperature Simulation Wiring Diagram .....................................................................................35
9.0 /F1 OPTION ASSEMBLY DRAWING .............................................................................................................36
10.0 SIL CERTIFICATE……………………………………………………………………………………………………37
11.0 EU DECLARATION OF CONFORMITY .......................................................................................................39
12.0 WARRANTY STATEMENT ...........................................................................................................................40

AT100-0200-1 Rev L (10-2010) DCN0528 4
K-TEK AT100 transmitters are used extensively around the world to accurately measure level in process
vessels. High accuracy and no maintenance are two of the most common reasons for choosing this technology.
With optional ratings to 800°F (427°C) and 3000 PSI (207 bar), K-TEK's Magnetostrictive Level Transmitters are
suitable for almost any application. HART, Honeywell DE, and Foundation Fieldbus Protocol options make our
AT100‟s easy to connect digitally to most control systems. LCD displays provide indication as 4-20mA, %, and other
engineering units.
When used on Storage Tanks, concerns of high accuracy, low maintenance and reasonable cost leads
customers to install flexible probe versions of the AT100‟s in their storage tanks. With the ability to be easily
installed to a maximum of 75 feet (23 meters), almost any liquid storage application can be handled. Some
common liquids include water, acids, caustics, propane, ammonia, oils, fuels, chemicals, and waste liquids. An
optional internal 20-segment increment table allows the AT100 to provide volumetric output in vertical cylinder,
horizontal cylinder or spherical vessels (See Section 4 for details on the Volumetric Strapping Table).
K-TEK‟s AT100‟s can be used as "Displacer Replacers". Most Liquid Level Displacers in dynamic
processes have seen many repetitive problems in operation including the following: extreme errors in output due to
specific gravity changes, leaks around the torque tube penetration, and low or stuck readings due to product buildup
on the torque tube or displacer. AT100‟s can be inserted into the existing Displacer Chambers or a new External
Chambers to solve the listed problems. Tremendous improvements in accuracy will be realized. Additionally, this is
an extremely easy way to update pneumatic Displacer Transmitters.
The Magnetostrictive Level Transmitter (AT100) can be used to measure the level of interface between two
fluids The AT100 is the finest technology available for liquid level interface measurement and control. K-TEK
AT100‟s can be equipped to provide two (2) level indications: one for interface and a second for total level. Designs
are available for differences of specific gravity down to 0.04 differences. Most commonly applied to oil and water
separator interface, this technique is used in many process applications. Others include HF acid / propane vessels,
de-salters and sumps.
The AT100 can be used as a Valve Positioner by utilizing the AT100‟s non-contact style of measurement. A
magnet is attached to the valve stem and the AT100 is located along side the valve stem. The inherent 0.01% high
accuracy in our AT100 transmitter allows exceptionally fine control and measurement of valve position. K-TEK‟s
AT100‟s never need to be re-calibrated ensuring accurate and precise control. The AT100 can also be used as an
Equipment Positioner. Industrial facilities require accurate positioning of equipment. This can be accomplished with
Magnetostrictive (non-contact measurement). It has been applied to many devices including gates, louvers,
dampers, and hydraulic cylinders. K-TEK advantages of push button configuration, 4-20mA output, and heavy duty
construction ensure ease of installation and a long trouble free life.
Finally, the AT100 can be used in various Sanitary Applications including the Bio-Tech, Pharmaceutical and
Food Industries. A range of surface finishes are available to suit the needs of the process environment including
electro-polishing.
Based on the Functional Safety Assessment of Exida, the AT100 transmitter is suitable for use in a Safety
Instrumented Function requiring a SIL 2 risk reduction in single use and a SIL 3 risk reduction in redundant use with
a Hardware Fault Tolerance of 1.
Only transmitters meeting all of the following requirements may be used in a Safety Instrumented Function:
 Transmitters fitted with a 4-20 mA output HART protocol /M4A or /M4B or /M4AS or /M4BS Electronic Module.
 Modules marked as follow: AT_H_01_S003_090209 or AT_H_TS_01_S003_090209 (Transmitters equipped
with software revision of AT_H_090209 or AT_H_TS_090209 and a hardware revision 01).
1.0 INTRODUCTION

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If required, storage prior to installation should be indoors at ambient temperature, not to exceed the following:
Temperature range: -40º- 150ºF (-40º- 66ºC)
Humidity: 0 to 95% R.H. non-condensing.
WARNING: Transmitter probes with /SW3 option have a flexible stainless steel sensor tube which is not hermetically
sealed. When removing the sensor from the sensor well, care should be taken not to expose the sensor to moisture, and to
prevent water from entering the sensor well.
3.1 All Installations
Prior to installation, verify the model of the transmitter listed on the nametag is suitable for the intended
application. Information regarding the model specifications may be found on the AT100 Datasheet at
www.ktekcorp.com.
3.1.1 Compression Fittings
When fitted with a compression fitting as the process connection, the sensor tube is shipped with a set of
TEFLON ferrules, and a set of metal ferrules in a separate bag. The Teflon ferrules are only intended for use in
applications with operating pressures below 50 PSI (3.4 bar) and temperatures below 400ºF (204ºC.); for higher
operating pressures or temperatures or for permanent installation, replace the Teflon ferrules with the metal ferrules.
3.1.2 Floats
During installation, it may be necessary to remove the float and spacer (if included) from the sensor tube.
For proper operation, the float must be reinstalled using the proper orientation. Floats may be marked with “Top for
SPM” or “Top for AT”, this end of the float must face the transmitter head. Other floats may be marked with an arrow
indicating the proper orientation. If a float is etched with information but does not indicate a proper orientation, it will
be bidirectional and can be installed in either direction. If a float does not have any markings (sanitary applications)
it will have an extra rolled seam to indicate the top half of the float.
3.2 Stilling Probes
Certain transmitter options will have the sensor tube inserted into a stilling probe. These options allow the
sensor tube and housing to be removed for service without breaking the seal on the vessel. These options include
(consult model number) SW1, SW2, SW3 and F1.
Model Sensor Type Stilling Probe
SW1 1/2” rigid 5/8“ tube
SW2 5/8” rigid 3/4” pipe (typical)
SW3 1/2” flexible stainless 5/8” tube
F1 5/8” flexible plastic 1” sectional tube
The compression fittings which hold the sensor inside the stilling probe will contain Teflon ferrules. It is not
necessary to change the Teflon ferrules to metal. This connection will not be required to hold pressure.
2.0 STORAGE INFORMATION
3.0 INSTALLATION AND BASIC WIRING
Option Height
H0 7.75 inches (197 mm)
H1, F1 14.75 inches (375 mm)
H2, H3 24.75 inches (629 mm)
3.1.3 Transmitter Housing
Once installed, the top of the transmitter housing will extend above the
process connection based on the particular model number. The extension of the
probe on some of the options is required to keep the transmitter electronics
within its safe operating environment not to exceed:
Temperature range: -40º- 150ºF (-40º- 66ºC)
Humidity: 0 to 95% R.H. non-condensing.

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3.3 Loop Wiring
Remove the test wires shipped with the transmitter. For field wiring, use 18 Gauge twisted shielded pair.
Please refer to included wiring diagram (Section 8.0). Electrical connection to the transmitter should comply with all
necessary standards as indicated by the area classification listed on the nameplate of the transmitter (Section 7.0).
Apply loop power to transmitter as follows:
Terminal Block + : +24 VDC (14-36 VDC)
Terminal Block - (METER) : COMMON
Terminal Block METER : Not used during normal operation
Ground screw : GROUND
- Ground wires must be connected to ground screws using fork terminals to ensure proper electrical connection.
- The current output of the transmitter is capable of driving a minimum of 250 ohms with a supply voltage of 19 Volts minimum.
WARNING: A multi-meter may be placed between the METER positions of the terminal block to read the current output
of the transmitter without breaking the loop wiring. Do not connect multi-meter to METER test positions when instrument
is located in a hazardous environment.
3.2.1 Assembly Instructions for F1 Flexible Probes
Refer to Appendix B for /F1 Option Assembly Drawing
1. Prepare joints #2 and #3 by lubricating the O-Ring and mating surface.
2. Lower the bottom tube section with the float stop and float into the tank.
3. Insert the top of the tube assembly through the mounting flange.
4. Add the next section of tube and thread together using thread locking fluid to secure joints.
5. Repeat step 4 for each middle tube sections.
6. Add the last section (TOP) of tube, with 1” compression fitting, and thread into assembly using thread
locking fluid to secure the joint.
7. Thread the tube compression fitting into the mounting flange using thread sealant.
8. Lower the tube assembly until it hits the bottom of the tank. Raise the sensor well back up ½” and
secure the assembly in place by tightening the tube compression fitting.
WARNING: When handling flexible tube, do not bend any section of the tube into a diameter of less than 4 ft., as this
could permanently damage the internal assembly and prevent proper operation.
9. Insert the flexible probe into the tube assembly. Secure flexible probe assembly to stainless steel tube
using 1” tube to 1” tube compression fitting.
WARNING: Insure that assembly is tight and properly sealed to prevent moisture entry.
3.4 Jumper Settings
The jumpers located on the face of the electronics module (top left hand side) can be setup as follows:
See Section 6.11
ALARM (Fail Safe): (left jumper)
-The Alarm jumper will determine the output of the transmitter in the event that there is a failure in detecting
the return signal from the sensor tube. This jumper should be set in the location which will send the control
structure into a safe state.
-Placing the jumper to the lower position causes the output to go to 20.99 mA when there is a loss of signal
or transmitter malfunction.
-Placing the jumper to the upper position causes the output to go to 3.61 mA when there is a loss of signal
or transmitter malfunction.
WRITE PROTECT (right jumper)
-When the jumper is in the lower position, the transmitter configuration cannot be changed via the
pushbuttons or with a handheld communicator.
For changes to the jumper settings to take effect, transmitter power must be turned OFF then back ON.
3.0 INSTALLATION AND BASIC WIRING

AT100-0200-1 Rev L (10-2010) DCN0528 7
4.1 Level Output Calibration
The AT100 is a digital transmitter with no routine calibration required. If re-calibration is required, calibration
can be changed using the module pushbuttons, a HART communicator (for units with the HART option), or with the
menu driven LCD readout (for units with LCD option).
4.1.1 Calibration Using the Pushbuttons
 Setting the 4mA point:
-Establish a tank level of 0% or move the float to the desired 0% point
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second.
-Press the DOWN button for 1 second to set the output at 4.00mA.
 Setting the 20mA point:
-Establish a tank level of 100% or move the float to the desired 100% point
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second.
-Press the UP button for 1 second to set the output at 20.00mA.
Note: The above steps can be repeated as many times as required
4.2 Reversing Action
If required, transmitter output can be reversed by following these steps (Note: this only reverses the 4-20 mA
output, not the Engineering Unit Readout)
4.2.1 Reverse Action Calibration Using The Pushbuttons
1. Adjust the tank level to 50% or move the float to the 50% point ( + or - 10% ).
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second and press
the DOWN button for 1 second to set the output at 4.00 mA.
2. Adjust the level or move the float to the new SPAN (20.00mA) point.
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second and press
the UP button for 1 second to set the output at 20.00 mA.
3. Adjust the level or move the float to the new ZERO (4.00mA) point.
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second and press
the DOWN button for 1 second to set the output at 4.00 mA.
Note: Procedures 4.1.1 and 4.2.1 will only change the calibration for the selected Primary Variable.
4.3 Damping
Damping helps to reduce the affects of rapid or irregular movement of the fluid level in a tank or vessel.
Adjustments to Damping will either increase or decrease the time required for the transmitter output to respond to
changes in input from the sensor tube. A higher number allows for more output stability. A lower number will
provide a quicker response. The maximum response time to a process change will be less than 110 milliseconds or
the value of the Damping, whichever is greater. The factory default setting for Damping is 0.8 seconds.
 The output damping amount can be changed as follows:
-Press the SELECT and UP buttons together for 1 second to double the damping value.
-Press the SELECT and DOWN buttons together for 1 second to divide the damping value by 2.
 The Damping value may also be adjusted in the Calibration Menu on transmitters equipped with an LCD Display.
The Damping is adjustable from 0 to 36 seconds.
4.0 TRANSMITTER CALIBRATION AND SETUP

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AT100 Menu Flow Chart
 To access a menu item press the SELECT button.
 Use the UP and DOWN buttons to scroll through each menu and change the value of digits and menu entries.
Notes: 1. These items will only appear based on the ordered options of the transmitter.
2. Current ranging works only on Level (LU). Even though selected, volume uses 4-20mA.
CAL - Calibration Menu
DAC TRIM
D 4 - DAC Trim 4 mA
D20 - DAC Trim 20 mA
END
MAIN DISPLAY
SET - Setup Menu
LL1 - Liquid Level 1
L1C - Level 1 Current
LL2 - Liquid Level 2 1
L2C - Level 2 Current 1
VOL - Volume 1
TMP - Temperature 1
CAL - Calibration MENU
CFG - Configuration MENU
END
LRV - Lower Range Value
LRC - Lower Range Current 2
URV - Upper Range Value
URC - Upper Range Current 2
DMP - Dampening
LTT - Lower Temperature Trim 1
UTT - Upper Temperature Trim 1
LVV - Lower Volume Value 1
UVV - Upper Volume Value 1
VOL TABL - MENU 1
END
DAC TRIM - MENU
I20 - Input Point 20
I01 - Input Point 1
O20 - Output Point 20
TBL SAVE
VST RSET
TBL LOAD
END
O01 - Output Point 1
O02, I02 through O19, I19
VOL TABL 1
CFG - Configuration Menu
DE MENU - MENU 1
PV= - Process Variable 1
EUN - Engineering Unit
L1O - Level 1 Offset
L2O - Level 2 Offset 1
EUN TEMP - F/C 1
TMP RSET 1
VOL EUN 1
UTP - Upper Trim Point 1
VOL MAN (or AUTO) 1
VMN - Volume Minimum 1
VMX - Volume Maximum 1
ALD - Alarm Delay
CCR - Custom Current Ranging 1
END
DE - On/Off
NV= - Number of Variables
DB - On/Off
DE MENU 1
END

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4.4 Calibration Using the LCD Setup Menu
The LCD Display option offers a menu driven setup that uses the UP, DOWN and SELECT pushbuttons. Refer to
the menu flow chart for navigation and selection instructions.
 Setting the 4mA point:
-Under the CAL menu, scroll DOWN to the LRV (Lower Range Value) menu option. Press SELECT to
change the value (in Engineering Units) for which the 4mA point is to be set.
 Setting the 20mA point:
-Under the CAL menu, scroll DOWN to the URV (Upper Range Value) menu option. Press SELECT to
change the value (in Engineering Units) for which the 20mA point is to be set.
Note: The above steps can be repeated as many times as required. This procedure will only change the
calibration for the selected Primary Variable.
4.5 Selecting a Primary Variable (PV)
This section applies to dual-float transmitters only.
For a dual-float transmitter, the primary variable (LL1 or LL2) defines the float used to calculate current (mA) output.
If the primary variable is set to LL1, current output will be determined by the position of the float nearest the
transmitter housing. Alternately, if PV is set to LL2, current will correlate to the float farthest from the transmitter.
 Selecting the Primary Variable
-Under the SET menu, access the CFG menu, then go to the PV= menu option.
-Press SELECT, then press UP or DOWN to cycle between LL1 and LL2 (the LCD will be blinking with your
selection).
-When the LCD is displaying the intended selection, press SELECT once more to set PV (the display should
stop blinking).
Note: If the Primary Variable is changed, it may be necessary to reset the 4 and 20 mA calibration points.
Electronics Without
LCD Display
Electronics With
LCD Display
4.0 TRANSMITTER CALIBRATION AND SETUP

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4.6 Selecting an Engineering Unit for Measurement (EUN)
The unit is capable of displaying level output in inches, feet, millimeters, centimeters, meters, or in percent of
range.
 Selecting an Engineering Unit
-Under the CFG menu, go to the EUN menu option.
-Press SELECT, then press UP or DOWN to cycle between engineering units.
-When the LCD is displaying the intended unit, press SELECT once more to set the engineering unit (the
display should stop blinking).
Note: Due to 4 digit display limitations on the display, if 9999mm will be exceeded, the metric engineering
units must be changed to cm.
4.7 Level Offsets (L1O and L2O)
Level Offsets can be utilized to make the indicated level on the transmitter match the actual level in your
tank or vessel. This is typically used to compensate for an un-measureable area at the bottom of the vessel. The
Level Offsets can also be utilized to make the indicated level on the AT transmitter match the indicated level of
another transmitter. Positive offsets will be added to the actual level of the transmitter to indicate a higher level.
Conversely, negative offsets will indicate lower levels.
 Changing the Level Offset
- Navigate to the L1O (Level 1 Offset) menu option.
- Press SELECT to change the value (in Engineering Units) of the level offset to be applied.
- For dual-float units, Level 2 can be offset via the above steps with the L2O menu option.
4.9.1 Selecting the Unit of Temperature (EUN TEMP)
The unit will display temperature in either Celsius or Fahrenheit degrees.
 Selecting the Unit of Temperature
-Under the CFG menu, go to the EUN TMP menu option.
-Press SELECT, then press UP or DOWN to cycle between Celsius and Fahrenheit.
-When the LCD is displaying the intended unit, press SELECT once more to set the temperature unit (the
display should stop blinking).
4.9 Temperature Output
This section applies only to transmitters with the temperature output option. These transmitters will have
module types of M5A or M5B with or without a suffix of “D” or “F”.
4.0 TRANSMITTER CALIBRATION AND SETUP
4.8 DAC Trim
The output of the AT100 transmitters will be set up at the factory using calibrated multi-meters. Once
installed, the current output received by the control system will be influenced by the available power and field wiring
and may not indicate an exact 4.00 and 20.00 mA. To correct this error a DAC TRIM may be performed.
 Performing the DAC Trim
-Under the CAL menu, scroll down to the DAC TRIM option
-Press UP and SELECT or DOWN and SELECT to enter the DAC TRIM menu
-At D 4 or D20 enter the current reading indicated at the control system and the transmitter will correct its
output
-Repeat each entry if needed then EXIT the menu.

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4.9.4 Temperature Master Calibration
The temperature indication of the AT100 will be factory calibrated from –200 to 300 degrees C. Under
normal circumstances, it will not be necessary to recalibrate the temperature transmitter. If for some reason
recalibration is required, the following steps will be used.
1. Disconnect the power.
2. Setup decade box per drawing in Section 8 - Wiring Diagrams
3. Set resistance to 185 ohms.
4. Apply power.
5. Set EUN TEMP to °C (Celsius)
6. Cycle through CFG menu to END.
7. At END push UP and DOWN together.
8. At FAC –200 press SELECT then UP and DOWN at the same time.
9. Scroll Down to END and SELECT.
10. Verify TMP indicates -200°C.
11. Disconnect the power.
12. Set decade box for 2120 ohms.
13. Apply power.
14. Cycle through CFG menu to END.
15. At END push UP and DOWN together.
16. Scroll down to FAC 300.
17. Press SELECT then UP and DOWN at the same time.
18. Scroll Down to END and SELECT.
19. Verify TMP indicates 300°C.
20. Disconnect the power.
21. Reconnect RTD.
22. Reapply power.
4.9.2 Temperature Output Calibration
The transmitter is factory calibrated to an accuracy of ±0.5° Celsius, over a range of -200 to 300°C. Fine
calibration and trim for a custom range can be done via the following steps:
 Setting the Lower Temperature Trim (LTT)
-Bring the sensor (located near the bottom of the transmitter probe) to the temperature that will be the lower
end of the temperature range.
-Under the CAL menu, go to the LTT (Lower Temperature Trim) menu option. Press SELECT to change
LTT to the current temperature of the sensor.
 Setting the Upper Temperature Trim (UTT)
-Bring the sensor (located near the bottom of the transmitter probe) to the temperature that will be the upper
end of the temperature range.
-Under the CAL menu, go to the UTT (Upper Temperature Trim) menu option. Press SELECT to change
UTT to the current temperature of the sensor.
Note: Trim must be within 10°C of factory calibration to be accepted.
4.9.3 Temperature Reset (TMP RSET)
If required, the unit‟s temperature settings (i.e. LTT and UTT) can be reset to the factory temperature
calibration. To reset the unit to the factory temperature calibration, navigate to the TMP RSET menu option and
press SELECT.
4.0 TRANSMITTER CALIBRATION AND SETUP

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4.10 Volumetric Strapping
Note: For AT100 models with Strapping Table option only. If utilizing Foundation Fieldbus refer to section 4.3.5.2
for strapping table instructions.
4.10.1 How the Strapping Table Works
The AT strapping table works by using table points set up by the user. For every point, there is a volume
(provided by the user) and a measurement (provided by either the user or the transmitter). These table points are
used to map sensor measurement to volume output. As the float travels the length of the probe, the volume output
will change based on the two points in the table closest to the given transmitter measurement. With no points in the
table, the volume output is linear between VMN (volume min) at 0 measurement and VMX (volume max) at UTP
(upper trim point) which equates to the highest point of float travel. As points are added, the volume output is
extrapolated with respect to VMN, the table points, and VMX.
The Volumetric Table is capable of being set up in two different modes, Automatic and Manual. In
Automatic mode, as a volume point is entered, the position of the transmitter float will determine the transmitter
measurement associated with the volume entered. In Manual mode, as a volume point is entered, the user will be
able to modify the measurement to which the volume corresponds.
The points in the table are listed sequentially on the LCD as O01, O02, I02, … O19, I19, O20, I20. An „O‟ is
listed for each output point, which corresponds to volume. An „I‟ is listed for each input point, which corre-
sponds to linear measurement. If in manual mode, both output and input points will be available. In automatic
mode, only output points will be shown.
4.10.2 Setting Up (or resetting) the Strapping Table
 Under the CAL menu:
-Scroll to VOL TABL, then press SELECT.
-Scroll up to VST RSET, then press SELECT. This will erase any table points currently set.
 Under the CFG menu:
-Scroll down to UTP, (which stands for Upper Trim Point) and note the value listed.
-Scroll down to VMX (Volume Maximum).
-Enter for 0 as a value „0000‟, then press SELECT to reset the LCD decimal.
-Next, enter the value of the Maximum Volume corresponding to UTP. Note: Enter only the whole number
of the value, since the decimal is not present, then press SELECT.
-After the decimal has been placed, set any digits to the right of the decimal, if available.
-Scroll up to VMN (Volume Minimum).
-Enter the volume of the tank at 0 measurement on the transmitter probe.
4.10.3 Selecting the Input Mode (Automatic or Manual)
 The AT transmitter provides two options for entering the values of the strapping table. The Automatic option
requires the level (or float) to be at the fixed location that corresponds to the selected volumetric output point
when the point is entered. If it is not possible (or feasible) for the tank level to be manipulated but a distance-to-
volume conversion chart is available, the strapping table can be easily set up using Manual mode.
 Under the CFG menu:
-Scroll down to VOL MAN or VOL AUTO (the LCD will display the current input mode).
-To switch between modes, press SELECT.
-Scroll UP or DOWN to change the mode.
-Press SELECT
4.0 TRANSMITTER CALIBRATION AND SETUP

AT100-0200-1 Rev L (10-2010) DCN0528 13
4.0 TRANSMITTER CALIBRATION AND SETUP
4.10.4 Setting Up Strapping Table Points
Under the CAL menu:
1) Scroll to VOL TABL, then press SELECT.
A) In manual mode, set the measured value for each Input Point and set the corresponding Output
Point to the desired volume value.
B) In automatic mode, position the float at the desired measurement point and set the
corresponding Output Point to the desired volume value.
2) Once the volume values and measurements are set in the table, scroll down to TBL SAVE and press
select. This will save the volume table in a backup location that may be recalled later by selecting TBL
LOAD.
4.10.5 Notes on Strapping Table Usage
 The volume entered for any point must be between VMN (Volume Min) and VMX (Volume Max).
 The measurement entered for any point must be between 0 measurement and UTP (Upper Trim Point).
 A point may be removed („zeroed out‟) from the table by entering „0‟ for it‟s output „O##‟ field. If a point
is zeroed out, it will be bypassed when volume output is calculated.
 A zeroed point may be set again, provided it is increasing with respect to the previous points in the table
list.
 For all points in the table, all points must be increasing in volume and increasing in measurement, with
the exception of zeroed points. When setting up the table, points should be set up sequentially from
VMN (at 0 measurement) to VMX (at UTP);
 It is not necessary to use all of the points in the Volume Table.
 Since the table is based on VMN and VMX, any change to either of these will invalidate the table.
Therefore, once the table is properly set up, DO NOT change either of these settings.
4.10.6 Saving / Loading a Strapping Table
Because setting up the strapping table can be a time-consuming process, it is possible to save a copy of the
table, and also to load the table from a previous save.
 To save the current strapping table:
Under the CAL menu:
-Scroll to VOL TABL, then press SELECT.
-Scroll up to TBL SAVE, then press SELECT.
 To load a saved strapping table:
Under the CAL menu:
-Scroll to VOL TABL, then press SELECT.
-Scroll up to TBL LOAD, then press SELECT.
4.10.7 Setting Current Output Based on Volume
 If the current output is to be based on volume:
-Under the CFG menu, scroll down to PV=.
-Press SELECT and scroll UP or DOWN to change the PV to VL1 (Volume 1) or VL2 (Volume 2) if
available. Selecting VL1 will filter the measurement from LL1 through the Volume Table, display
the result as the Volume (VOL) and output the current based on this volume. Selecting VL2 will
filter the measurement from LL2 through the Volume Table, display the result as the Volume (VOL)
and output the current based on this volume.
-Under the CAL menu, scroll down to LVV. Set this value to the volume that will correspond to 4mA.
-Scroll down to UVV. Set this value to the volume that will correspond to 20mA.
Note: LVV and UVV must be within VMN and VMX.

AT100-0200-1 Rev L (10-2010) DCN0528 14
4.12 Custom Current Ranging
4.12.1 Description and Method of Operation
All AT200 transmitters are set by the factory with the LRV set to 0 measurement and the URV set to the
range of the transmitter unless a specific calibration is indicated when the transmitter is ordered. In this standard
configuration, the transmitter will output 4mA when the float reaches the LRV and 20mA when the float reaches the
URV. Using the Level Offset (L1O) feature, the indicated measurement at this point can be changed to something
other than 0 measurement. Changing the offset will not affect the output of the transmitter. The mA output will
remain at 4.00 when the float reaches the zero mark on the sensor tube.
In some applications it may be necessary to have the transmitter output something other than 4.00mA with
the float located at the zero mark of the sensor tube. In these cases, Custom Current Ranging (CCR) can be
applied to the transmitter. CCR will allow the user to change the milliamp values associated with LRV and URV. For
example, the Lower Range Current (LRC) can be set to 5.00mA. With the LRV set to 0 measurement, the
transmitter will output 5.00mA and display 0 measurement. Once the LRC and URC are set, using the calibration
procedures in Section 4.1.1 or 4.4 will result in the current output corresponding to LRC and URC instead of 4 and
20mA. Custom Current Ranging may not be activated if the AT100 is being used in a Safety Implemented System.
4.12.2 CCR Set Up
1. Enter the Configuration Menu (CFG).
2. Scroll down to CCR.
3. Press SELECT.
4. Scroll UP or DOWN to turn CCR ON.
5. Press SELECT.
6. Exit the CFG Menu.
7. Enter the Calibration Menu (CAL).
8. Scroll down to LRC and press SELECT.
9. Using the UP and DOWN buttons enter the digits corresponding to the mA value that will be associated
with the measurement in LRV. (Press SELECT after each digit is set to move to the next digit.)
10. Scroll down to URC and press SELECT.
11. Using the UP and DOWN buttons enter the digits corresponding to the mA value that will be associated
with the measurement in URV. (Press SELECT after each digit is set to move to the next digit.)
12. Exit the CAL Menu.
To revert back to standard values for LRV and URV (4 and 20 mA respectively,) turn CCR - OFF.
4.0 TRANSMITTER CALIBRATION AND SETUP
4.11 Alarm Delay
The AT100 transmitter is designed to send the current output into a Fail Safe mode when the transmitter
does not detect a return signal from the sensor tube or the transmitter experiences a diagnostic failure. In certain
installations (such as high vibration areas) the transmitter may experience sporadic interruptions in the return signal
which are not an indication of sensor tube failure. The spiking output affect caused by the interruptions can be
eliminated by using the Alarm Delay feature. Increasing the Alarm Delay will cause the transmitter to hold the last
good level indication (and its corresponding current output) for a period of time equivalent to the Alarm Delay value
(0-99.99 seconds). If the transmitter does not detect a good return signal within this time, the output will change to
the Fail Safe selected by the jumper settings. If within the Alarm Delay time frame, a good signal is detected, the
transmitter will respond with a level indication and output based on the new reading and the Alarm Delay clock will
reset.
 Setting the Alarm Delay:
- Under the CFG menu, scroll DOWN to the ALD (Alarm Delay) menu option.
- Press SELECT to access the setting.
- Use the UP and DOWN arrows to change each digit.
- Use the SELECT button to move from one digit to the next.

AT100-0200-1 Rev L (10-2010) DCN0528 15
5.1 HART Protocol Interface Option
The K-TEK transmitter can be ordered with the HART Protocol Option, which is installed at the factory as a
part of the electronic module assembly. When fitted with the HART Protocol Option, it will be possible to
communicate with the transmitter using a Rosemount 268, 275, or 375 communicator utilizing slave mode. HART
communications will allow access to certain functions. This communication will not interfere in the operation of the
transmitter. If the AT100 is to be used in a Safety Implemented System, HART communications can only be used to
configure or proof test the transmitter.
5.1.1 Using a 268/275/375 Rosemount Communicator or Equal
Since the K-TEK transmitter is not a known ROSEMOUNT product, these handheld devices will
communicate in the GENERIC mode. This mode allows access to the commands listed here:
 READ OR WRITE OUTPUT UPPER RANGE & LOWER RANGE VALUES
 READ OR WRITE OUTPUT DAMPING VALUE
 READ OR WRITE TRANSMITTER TAG, DESCRIPTION, MSG, DATE
 PERFORM OUTPUT DIGITAL TRIM (DAC TRIM)
 TEST LOOP OUTPUT
 SET POLLING ADDRESS
Changes to transmitter settings via HART communication must be verified by cycling power to the transmitter,
reestablishing communications, and reading the values.
NOTE: If a transmitter is in an alarm condition (20.97 or 3.61 mA) or does not have a float present on the sensor tube, the
handheld communicator will respond as if the transmitter had a hardware failure. If there is a float present, proceed with
troubleshooting in Section 6.
5.2 Honeywell DE Protocol
5.2.1 Interoperability and Conformance Class
The Honeywell DE Protocol option uses the Honeywell proprietary Digitally Enhanced Protocol for Smart
Transmitters.
The conformance class support is as follows:
The DCS configuration should be set for Class 0, 4 byte Mode.
Class 0: Continuous broadcast, in burst mode, of the following parameters:
PV1: Primary Variable; Level #1 in %
PV2: Secondary Variable; Level #2 in % (if equipped)
PV status: Ok, Critical or Bad PV
The Transmitter settings should be as follows:
DE = ON
NPV (Number of Process Variables) = 1 or 2
DB = OFF
5.0 COMMUNICATION OPTIONS
5.2.2 Operating Modes
The K-TEK transmitter with the Honeywell DE Protocol option can be operated in two ways which can be
selected using the setup menu on the instrument. (See section 3.2.2 Calibration using the LCD Setup Menu.)
 DE Digital Mode: In this mode the transmitter output is strictly digital and uses the Honeywell DE
Protocol which modulates the loop current ON and OFF to transmit digital information per above Class
Performance definition.
 Analog Output Mode: Selecting the Analog Output Mode disables the Honeywell DE Digital Output and
places the transmitter in a standard 4-20mA Output mode. In this mode, no digital communications are
available.

AT100-0200-1 Rev L (10-2010) DCN0528 16
5.3 Foundation Fieldbus
5.3.1 Topology
The device may be installed in either a Bus or Tree topology.
5.0 COMMUNICATION OPTIONS
Junction Box
Terminator
Shield
+
-
Terminator
Junction Box
Shield
Spur
SpurSpur
Bus Topology
Coupler
Coupler
Fieldbus
Power
Supply
Phase
Neutral
Ground
Fieldbus
Power
Supply
Panel
Ground
Analog
Ground
Phase
Neutral
Ground
Panel
Ground
Analog
Ground
+
-
+
-
+
-
+
-
+
-
+
-
Bus Topology
Junction Box
Terminator
Shield
+
-
Terminator
Junction Box
Shield
Spur
SpurSpur
Bus Topology
Coupler
Coupler
Fieldbus
Power
Supply
Phase
Neutral
Ground
Fieldbus
Power
Supply
Panel
Ground
Analog
Ground
Phase
Neutral
Ground
Panel
Ground
Analog
Ground
+
-
+
-
+
-
+
-
+
-
+
-
Tree Topology
5.3.2 Electrical Considerations
Power Supply:
 The transmitter requires between 9 and 32 V dc to operate and provide complete functionality. The DC
power supply should provide power with less than 2% ripple.
 Various types of Fieldbus devices may be connected on the same bus.
 The AT is powered via the bus. The limit for such devices is 16 for one bus (one segment) for
non-intrinsically safe requirement. In hazardous area, the number of devices may be limited by
intrinsically safe restrictions. The AT is protected against reverse polarity, and can withstand ±35 VDC
without damage.
Power Filter:
A Fieldbus segment requires a power conditioner to isolate the power supply filter and decouple the
segment from other segments attached to the same power supply.

AT100-0200-1 Rev L (10-2010) DCN0528 17
5.0 COMMUNICATION OPTIONS
5.3.4 Jumper Settings
The Jumpers are located on the face of the electronic module (top left hand side) can be setup as follows:
 WRITE PROTECT (right jumper) See Document ELE1002
- When the jumper is in the lower position, the transmitter configuration cannot be changed via the LCD.
 SIMULATE (left jumper) See Document ELE1002
-The simulate jumper is used in conjunction with the Analog Input (AI) function block. This switch is used to
simulate channel output, and as a lock-out feature for the AI function block. To enable the simulate feature,
move the jumper to the lower position on the module housing.
5.3.3 Field Wiring
All power to the transmitter is supplied over the signal wiring. Signal wiring should be a shielded, twisted pair
for best results. Do not run unshielded signal wiring in conduit or open trays with power wiring or near heavy
electrical equipment.
If the sensor is installed in a high-voltage environment and a fault condition or installation error occurs, the
sensor leads and transmitter terminals could carry lethal voltages. Use extreme caution when making contact with
the leads and terminals.
Quiescent Current Consumption: 12.5mA.
Communication Mode: H1 (31.25Kbit/s Voltage Mode Signaling). All other devices on the same bus must
use the same signaling. 12 to 16 devices can be connected in parallel along the same pair of wires.
5.3.5 DD Files
The incorporation of the AT100 transmitter in a control system will require the use of specific DD files within
the host system. These files may be downloaded from www.fieldbus.org.
5.3.6 Transducer Block
The Transducer Block contains transmitter specific data regarding the setup, configuration, and indication of
the instrument. Under normal circumstances it will not be necessary to change any of the parameters in the
Transducer Block. The process data is expressed in the Transducer Block as the following:
LEVEL_VALUE_1: Level 1
LEVEL_VALUE_2: Level 2 *
TEMPERATURE_VALUE: Temperature *
LIN_VALUE_1: Linearization/Strapping Output, Level 1 *
LIN_VALUE_2: Linearization/Strapping Output, Level 2 *
* = Depending on options selected when ordering
5.3.7 Analog Input (AI) Function Blocks
The AT transmitter comes configured with 5 AI Function Blocks. Depending on the specific model, each
block can be used to access 1 of the 5 possible Transducer Block output values. The AI Blocks take data from the
Transducer Block and make it available to other blocks. To select the desired data, configure the AI.CHANNEL
parameter as follows:
AI.CHANNEL = 1: Level 1
AI.CHANNEL = 2: Level 2 *
AI.CHANNEL = 3: Temperature *
AI.CHANNEL = 4: Linearization/Strapping Output, Level 1 *
AI.CHANNEL = 5: Linearization/Strapping Output, Level 2 *
* = Depending on options selected when ordering

AT100-0200-1 Rev L (10-2010) DCN0528 18
5.3.9 Link Active Scheduler / Back-up LAS
The AT transmitter is designed as a Link Master (LM) class device. With this feature, the instrument can
become a fully functioning Link Active Scheduler (LAS) in the event that the primary LAS (typically the host system)
fails. The device must be configured as the Link Master to take advantage of this functionality.
5.3.10 Setting Up the Strapping/Linearization Table (Requires /S option)
The Linearization/Strapping table is configured via the LIN_LENGTH, LIN_X, and LIN_Y parameters of the
Transducer Block. To configure the table, set the LIN_LENGTH parameter to the number of desired table points (1-
26). The input to each point should then be set to a LIN_X value, and the output to each point should be set to a
LIN_Y value. Note: The Linearization table can only be configured when the Transducer Block is set to Out of
Service (TRANSDUCER.MODE_BLK.ACTUAL=OOS).
5.0 COMMUNICATION OPTIONS
5.3.8 PID Blocks
The AT transmitter is equipped with 5 PID (Proportional, Integral, Derivative) Blocks. These blocks can be
used to implement control algorithms within the transmitter. The output of the PID Block can be linked to the AO
(Analog Output ) Block of another instrument like a valve or to the input of another PID Block.
5.3.11.2 Offsetting a Measurement
Using the same example in section 1, the level indication can be changed to return an offset
measurement instead of a percentage using the following configuration:
AI.L_TYPE must be "INDIRECT" (to use XD_SCALE->OUT_SCALE mapping)
AI.XD_SCALE.EU_0 = 0 (in)
AI.XD_SCALE.EU_100 = 48 (in)
AI.XD_SCALE.UNITS_INDEX="in"
AI.OUT_SCALE.EU_0 = 12 (in)
AI.OUT_SCALE.EU_100 = 60 (in)
AI.OUT_SCALE.UNITS_INDEX = "in"
5.3.11 Sample Configurations
5.3.11.1 Level Indication in Percent
A simple application of the AT100 transmitter will be to return a level indication as a percentage. With a
desired range of 48 inches of level, the following configuration could be used:
AI.L_TYPE must be "INDIRECT" (to use XD_SCALE->OUT_SCALE mapping)
AI.XD_SCALE.EU_0 = 0 (in)
AI.XD_SCALE.EU_100 = 48 (in)
AI.XD_SCALE.UNITS_INDEX="in"
AI.OUT_SCALE.EU_0 = 0 (%)
AI.OUT_SCALE.EU_100 = 100 (%)
AI.OUT_SCALE.UNITS_INDEX = "%"

AT100-0200-1 Rev L (10-2010) DCN0528 19
6.1 Personnel Qualifications
Safety Inspection, Maintenance and Troubleshooting should only be performed by qualified personnel.
These qualifications include a knowledge of the information in this instruction manual, knowledge of the product and
its operating principles, knowledge of the application in which the transmitter is being applied, and general
experience as an Instrument Technician.
6.2 Required Tools
The following tools may be required to perform inspection, maintenance or troubleshooting of the AT100
transmitter.
- Crescent Wrench
- Screwdrivers
- Hex Key Wrenches
- Digital Multi-meter
- Tape Measure
- Portable Oscilloscope (optional)
- Oscilloscope Connector (purchased from K-TEK) or three pieces 26awg solid core wire (6in/150mm)
The AT100 will operate normally without the need for periodic maintenance or inspection. If the transmitter
meets or exceeds the requirements of the application, the transmitter can be expected to provide reliable level
indication for a minimum of 10 years.
If the AT100 transmitter is being used as part of a Safety Implemented System (SIS), periodic testing will be
required to proof the transmitter and detect any potential failure which is defined as Dangerous Undetectable in
normal operation. Proof testing must be performed at regular intervals (2 years) and the results of this testing must
be documented. Should the transmitter exhibit a fault during normal operation, it will be necessary to perform the
proof testing regardless of schedule. As part of the testing documentation, all parameters included in the menu
structure of the transmitter (see page 8) as well as the configuration of the module jumpers (see page 6) must be
recorded. An AT100 can be equipped to provide a level indication from two floats as well as a temperature
indication from an RTD installed in the sensor tube. The transmitter is only capable of supplying (1) 4-20mA output
based on one of the two possible levels. If a transmitter is equipped with more than one float and/or a temperature
indication, only the process variable selected by the PV= menu option will be considered as a safety function as this
selected variable will be the basis for the 4-20mA output. The AT100 transmitter may only be used in a safety-
related system when the mode of that system is low demand. As a device, the AT100 transmitter will be used to
provide a level measurement to prevent overfill and dry run of a vessel.
If a transmitter fails an inspection or assistance is required for inspection or troubleshooting, contact the
Service Department at K-TEK Corporation via e-mail at [e-mail]. The Service Department will answer
questions, provide additional assistance, and issue Return Authorization Numbers for equipment in need of repair.
CAUTION: In the event a magnetostrictive transmitter has suffered a failure in any component which is exposed to the process,
any other magnetostrictive transmitter installed in the same or similar process should be inspected for the same failure regardless
of its maintenance schedule. These Common Cause Failures include: 1) float collapse due to over pressure, 2) probe or float
corrosion due to material incompatibility, 3) deformation of the sensor tube due to process agitation.
Notes on usage in Safety Instrumented Systems:
1) The AT100 performs internal diagnostics at a maximum interval of 15 minutes.
2) The AT100 will provide annunciation of a diagnostic failure in less than 15 minutes of the occurrence.
3) The failure of any internal diagnostics will result in notification of the fault by setting of diagnostic bits in HART protocol
output.
4) All AT100 FMEDA analysis is based on using a safety accuracy of 2%.
5) The internal diagnostics are designed to achieve a Safe Failure Fraction of 90% minimum.
6) The target average probability of failure on demand is less than 1.5 x 10-3.
7) AT200 transmitters may only be used in a SIS when:
a) Transmitters are fitted with a 4-20 mA output HART Protocol /M4A or /M4B or /M4B or /M4AS or /M4BS Electronic Module
b) Modules must be marked as follows: AT_H_01_S003_090209 or AT_H_TS_01_S003_090209
6.0 SAFETY, MAINTENANCE, AND TROUBLESHOOTING

AT100-0200-1 Rev L (10-2010) DCN0528 20
6.4.1 Float Inspection
The AT100 will detect and report the position of the float on its sensor tube as a level of fluid in the process.
In order to measure the fluid in the process properly, the float must move freely up and down the sensor tube
partially submerged in the liquid level. If the float were to become damaged or stuck on the sensor tube, the
transmitter will still report the float position regardless of the actual process fluid level. This by definition is a
Dangerous Undetectable failure. To prevent this failure the float will need to be inspected for integrity and
movement. Some transmitters will have two floats mounted on the sensor tube. This inspection should be done on
both floats.
1) Move the float up and down the length of the sensor tube. It should move freely from the bottom of the sensor tube to
the process connection.
2) Remove the float from the sensor tube by removing the retaining clip or bolt from the end of the transmitter. Inspect
the float for signs of excessive wear or damage.
3) Submerge the float in a container of water to check for leaks as air bubbles escaping from the float. The float is a
sealed unit and any holes in the shell of the float could allow process fluid to seep inside.
Note: K-TEK floats are designed for different specific gravity ranges. The float may or may not float in the water. It may
be necessary to hold the float under the water to perform this test.
Upon completion of float inspection, place the float back on the sensor tube paying carful attention to float
orientation. Some AT100 transmitters will be equipped with float spacers designed to keep the float positioned in the
measurable range of the sensor tube. It is important that the spacer be replaced when the transmitter is
reassembled.
6.4 Safety Inspection & Test
An AT100 transmitter can be divided up into four major components the float, the sensor, the transmitter,
and the output. All of these components and their subcomponents should be evaluated during each periodic
inspection. This inspection (and possible repair) should take less than 4 hours if the proper tools are made
available. Prior to inspection, the transmitter should be removed from service following end user specified
procedures regarding lockout, tag out, wiring and cleaning. Once removed from service, the AT100 transmitter
should be laid on a flat even surface.
6.0 SAFETY, MAINTENANCE, AND TROUBLESHOOTING
6.3 Suggested Proof Test
The suggested proof test consists of minimum and maximum current capability test followed by a two-point
calibration of the transmitter, see the suggested proof test Table. This text will detect > 99% of possible DU failures
in the device.
AT100 Suggested Proof Test Table
Step Action
1. Bypass the safety function and take appropriate action to avoid a false trip.
2. Use HART communications to retrieve any diagnostics and take appropriate action.
3. Send a HART command to the transmitter to go to the high alarm current output and verify that the analog
current reaches that value1.
4. Send a HART command to the transmitter to go to the low alarm current output and verify that the analog
current reaches that value2.
5. Perform a two-point calibration3of the transmitter over the full working range.
6. Remove the bypass and otherwise restore normal operation.
Notes:
1. This tests for compliance voltage problems such as a low loop power supply voltage or increased wiring resistance. This also tests
for other possible features.
2. This tests for possible quiescent current related failures.
3. If the two-point calibration is performed with electrical instrumentation, this proof test will not detect any failures of the sensor.