Emerson Rosemount 5081-T User manual

Model 5081-T
Two-Wire Toroidal Conductivity Transmitter
Instruction Manual
PN 51-5081T/rev.D
February 2006

Emerson Process Management
Rosemount Analytical Inc.
2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: [phone]
Fax: [phone]
http://www.raihome.com
© Rosemount Analytical Inc. 2006
ESSENTIAL INSTRUCTIONS
READ THIS PAGE BEFORE PROCEEDING!
Rosemount Analytical designs, manufactures, and tests its products to meet many national and international
standards. Because these instruments are sophisticated technical products, you must properly install, use, and
maintain them to ensure they continue to operate within their normal specifications. The following instructions
must be adhered to and integrated into your safety program when installing, using, and maintaining Rosemount
Analytical products. Failure to follow the proper instructions may cause any one of the following situations to
occur: Loss of life; personal injury; property damage; damage to this instrument; and warranty invalidation.
• Read all instructions prior to installing, operating, and servicing the product. If this Instruction Manual is not the
correct manual, telephone [phone] and the requested manual will be provided. Save this Instruction
Manual for future reference.
• If you do not understand any of the instructions, contact your Rosemount representative for clarification.
• Follow all warnings, cautions, and instructions marked on and supplied with the product.
• Inform and educate your personnel in the proper installation, operation, and maintenance of the product.
• Install your equipment as specified in the Installation Instructions of the appropriate Instruction Manual and per
applicable local and national codes. Connect all products to the proper electrical and pressure sources.
• To ensure proper performance, use qualified personnel to install, operate, update, program, and maintain the
product.
• When replacement parts are required, ensure that qualified people use replacement parts specified by
Rosemount. Unauthorized parts and procedures can affect the product’s performance and place the safe
operation of your process at risk. Look alike substitutions may result in fire, electrical hazards, or improper
operation.
• Ensure that all equipment doors are closed and protective covers are in place, except when maintenance is
being performed by qualified persons, to prevent electrical shock and personal injury.
CAUTION
If a Model 375 Universal Hart® Communicator is used with these transmitters, the software within the Model 375 may require
modification. If a software modification is required, please contact your local Emerson Process Management Service Group
or National Response Center at 1-800-654-7768.
About This Document
This manual contains instructions for installation and operation of the Model 5081-T Two-Wire
Conductivity Transmitter. The following list provides notes concerning all revisions of this document.
Rev. Level Date Notes
A 1/05 This is the initial release of the product manual. The manual has been
reformatted to reflect the Emerson documentation style and updated to
reflect any changes in the product offering. This manual contains
information on HART Smart and FOUNDATION Fieldbus versions of
Model 5081-T.
B 5/05 Fix LED font on pages 4, 30, 34, 35, 39.
C 10/05 Add instructions to enable autoranging or fixed measurement renges on
page 50.
D 2/06 Add FISCO agency certifications drawings, pp. 30-36.

i
MODEL 5081-T TABLE OF CONTENTS
MODEL 5081-T
TWO-WIRE TRANSMITTER
TABLE OF CONTENTS
Section Title Page
1.0 DESCRIPTION AND SPECIFICATIONS ................................................................ 1
1.1 Features and Applications........................................................................................ 1
1.2 Specifications ........................................................................................................... 2
1.3 Hazardous Location Approval .................................................................................. 3
1.4 Transmitter Display During Calibration and Programming....................................... 4
1.5 Infrared Remote Controller ...................................................................................... 4
1.6 HART Communications ........................................................................................... 5
1.7 FOUNDATION Fieldbus............................................................................................... 6
1.8 Asset Management Solutions ................................................................................. 6
2.0 INSTALLATION ....................................................................................................... 8
2.1 Unpacking and Inspection........................................................................................ 8
2.2 Orienting the Display Board ..................................................................................... 8
2.3 Mechanical Installation............................................................................................. 8
2.4 Power Supply/Current Loop Wiring for Model 5081-T-HT ....................................... 12
2.5 Power Supply Wiring for Model 5081-T-FF/FI.......................................................... 13
3.0 WIRING.................................................................................................................... 14
3.1 Sensor Wiring .......................................................................................................... 14
3.2 Electrical Installation ................................................................................................ 16
4.0 INTRINSICALLY SAFE AND EXPLOSION PROOF INSTALLATIONS.................. 19
4.1 Intrinsically Safe and Explosion-Proof Installation for Model 5081-T-HT ................. 19
4.2 Intrinsically Safe and Explosion-Proof Installation for Model 5081-T-FF ................. 25
4.3 Intrinsically Safe and Explosion-Proof Installation for Model 5081-T-FI .................. 30
5.0 DISPLAY AND OPERATION ................................................................................... 37
5.1 Displays ................................................................................................................... 37
5.2 Infrared Remote Controller (IRC) — Key Functions ................................................ 38
5.3 Quick Start for Model 5081-T-HT ............................................................................. 39
5.4 Quick Start for Model 5081-T-FF/FI ......................................................................... 40
5.5 Menu Tree................................................................................................................ 41
5.6 Diagnostic Messages............................................................................................... 43
5.7 Default Setting ......................................................................................................... 43
5.8 Security .................................................................................................................... 45
5.9 Using Hold ............................................................................................................... 45
6.0 START-UP AND CALIBRATION ............................................................................. 46
6.1 Accessing the Calibrate Menu ................................................................................. 46
6.2 Calibrate Menu......................................................................................................... 47
....................................................................................Continued on following page

MODEL 5081-T TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D
ii
7.0 PROGRAMMING..................................................................................................... 50
7.1 General .................................................................................................................... 50
7.2 Output ...................................................................................................................... 51
7.3 Temp ........................................................................................................................ 53
7.4 Display ..................................................................................................................... 54
7.5 HART ....................................................................................................................... 55
7.6 Setup Cust ............................................................................................................... 56
7.7 Range ...................................................................................................................... 57
7.8 Default......................................................................................................................57
8.0 FOUNDATION FIELDBUS OPERATION ................................................................ 58
9.0 OPERATION WITH MODEL 375............................................................................. 59
9.1 Note on Model 375 or 275 Communicator ............................................................... 59
9.2 Connecting the Communicator ................................................................................ 59
9.3 Operation ................................................................................................................. 60
10.0 DIAGNOSIS AND TROUBLESHOOTING............................................................... 75
10.1 Overview .................................................................................................................. 75
10.2 Fault Conditions ....................................................................................................... 77
10.3 Diagnostic Messages............................................................................................... 78
10.4 Quick Troubleshooting Guide................................................................................... 79
10.5 Systematic Troubleshooting..................................................................................... 80
10.6 RTD Resistance Values ........................................................................................... 81
10.7 Warning and Fault Messages .................................................................................. 82
10.8 Troubleshooting When a Fault or Warning Message is Showing ............................ 83
11.0 MAINTENANCE ...................................................................................................... 86
11.1 Overview .................................................................................................................. 86
11.2 Preventative Maintenance ....................................................................................... 86
11.3 Corrective Maintenance ........................................................................................... 86
12.0 THEORY OF OPERATION ..................................................................................... 89
12.1 Overview .................................................................................................................. 89
12.2 Conductivity ............................................................................................................. 89
12.3 HART Communication ............................................................................................. 89
12.4 Output Logic............................................................................................................. 89
13.0 RETURN OF MATERIAL......................................................................................... 91

iii
MODEL 5081-T TABLE OF CONTENTS
LIST OF FIGURES
Number Title Page
1-1 Transmitter Display During Calibration and Programming ....................................... 4
1-2 Infrared Remote Controller....................................................................................... 4
1-3 HART Communicator ............................................................................................... 5
1-4 Configuring Model 5081-T Transmitter with Foundation Fieldbus............................ 6
1-5 AMS Main Menu Tools ............................................................................................. 7
2-1 Mounting the Model 5081-T Transmitter on a Flat Surface ...................................... 9
2-2 Using the Pipe Mounting Kit to Attach the Model 5081-T to a pipe .......................... 10
2-3 Load/Power Supply Wiring Requirements................................................................ 12
2-4 Model 5081-T-HT Power Wiring Details ................................................................... 12
2-5 Typical Fieldbus Network Electrical Wiring Configuration ........................................ 13
2-6 Model 5081-T-FF Power Wiring Details ................................................................... 13
3-1 Wiring Model 5081-T-HT .......................................................................................... 14
3-2 Power Supply/Current Loop Wiring for Model 5081-T-HT........................................ 15
3-3 Power Supply/Current Loop Wiring for Model 5081-T-FF ........................................ 15
3-4 Power Supply and Sensor Wiring for Model 5081-T ................................................ 15
3-5 Wiring Model 242 Sensor to Model 5081-T Transmitter .......................................... 16
3-6 Wiring Models 222, 225, 226, 228, 242, 247 to Model 5081-T Transmitter................. 17
3-7 Wiring Models 222, 225, 226, 228 to Model 5081-T Transmitter ................................ 18
4-1 Model 5081-T-HT Infrared Remote Control — CSA, FM, & ATEX approvals........... 19
4-2 Model 5081-T-FF Infrared Remote Control — CSA, FM, & ATEX approvals ........... 19
4-3 FM Explosion-Proof Installation for Model 5081-T-HT ............................................. 20
4-4 FM Intrinsically Safe Installation for Model 5081-T-HT............................................. 21
4-5 CSA Intrinsically Safe Installation for Model 5081-T-HT........................................... 22
4-6 ATEX Intrinsically Safe Label for Model 5081-T-HT ................................................. 23
4-7 ATEX Intrinsically Safe Installation for Model 5081-T-HT......................................... 24
4-8 FM Explosion-Proof Installation for Model 5081-T-FF.............................................. 25
4-9 FM Intrinsically Safe Installation for Model 5081-T-FF ............................................. 26
4-10 CSA Intrinsically Safe Installation for Model 5081-T-FF ........................................... 27
4-11 ATEX Intrinsically Safe Label for Model 5081-T-FF ................................................. 28
4-12 ATEX Intrinsically Safe Installation for Model 5081-T-FF ......................................... 29
4-13 FM Explosion-Proof Installation for Model 5081-T-FI ............................................... 30
4-14 FM Intrinsically Safe Label for Model 5081-T-FI....................................................... 31
4-15 FM Intrinsically Safe Installation for Model 5081-T-FI .............................................. 32
4-16 CSA Intrinsically Safe Label for Model 5081-T-FI..................................................... 33
4-17 CSA Intrinsically Safe Installation for Model 5081-T-FI ............................................ 34
4-18 ATEX Intrinsically Safe Label for Model 5081-T-FI................................................... 35
4-19 ATEX Intrinsically Safe Installation for Model 5081-T-FI .......................................... 36

iv
MODEL 5081-T TABLE OF CONTENTS
LIST OF FIGURES - CONT’D
Number Title Page
5-1 Process Display Screen ........................................................................................... 37
5-2 Program Display Screen .......................................................................................... 37
5-3 Infrared Remote Controller....................................................................................... 38
5-4 Menu Tree for Model 5081-T-HT .............................................................................. 41
5-5 Menu Tree for Model 5081-T-FF ............................................................................. 42
6-1 Menu Tree ............................................................................................................... 46
6-2 Current Output Calibration ....................................................................................... 47
8-1 Functional Block Diagram for the Model 5081-T with FOUNDATION Fieldbus.......... 58
9-1 Connecting the HART Communicator ...................................................................... 59
9-2 5081-T-HT HART/Model 375 Menu Tree.................................................................. 61
9-3 5081-T-FF/FI Model 375 Menu Tree ........................................................................ 65
10-1 Diagnose Menu Segments ....................................................................................... 75
10-2 Disabling Fault Annunciation .................................................................................... 77
10-3 Warning Annunciation............................................................................................... 77
10-4 Troubleshooting Flow Chart ..................................................................................... 80
10-5 Conductivity Determination ...................................................................................... 81
11-1 Hold Annunciation .................................................................................................... 86
LIST OF TABLES
Number Title Page
5-1 Default Settings fro Model 5081-T-FF ...................................................................... 43
5-2 Default Settings fro Model 5081-T-HT...................................................................... 44
6-1 Calibrate Menu Mnemonics...................................................................................... 49
10-1 Diagnostic Variables Mnemonics ............................................................................. 76
10-2 Diagnostic Fault Messages ...................................................................................... 78
10-3 Quick Troubleshooting Guide ................................................................................... 79
10-4 RTD Resistance Values............................................................................................ 81
11-1 Model 5081-T Replacement Parts and Accessories................................................. 87

1
MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
• CHOICE OF COMMUNICATION PROTOCOL: HART or FOUNDATION Fieldbus.
• LARGE, EASY-TO-READ two-line display shows the process measurement and temperature.
• SIMPLE MENU STRUCTURE.
• ROBUST NEMA 4X and NEMA 7B ENCLOSURE.
• INTRINSICALLY SAFE DESIGN allows the transmitter to be used in hazardous environments
(with appropriate safety barriers).
• NON-VOLATILE MEMORY retains program settings and calibration data during power failures.
• MEASURES CONDUCTIVITY, % CONCENTRATION, PPM, OR CUSTOM CURVE VARIABLE.
• AUTOMATIC TC RECOGNITION simplifies start up.
• AUTOMATIC/MANUAL TEMPERATURE COMPENSATION ensures accurate monitoring and control.
• AUTOMATIC COMPENSATION FOR SENSOR CABLE RESISTANCE improves accuracy of high
conductivity/ low resistivity measurements.
• BUILT-IN PERCENT CONCENTRATION CURVES INCLUDE 0-15% NaOH, 0-16% HCl, 0-30%
and 96-99.7% H2SO4.
1.1 FEATURES AND APPLICATIONS
The Model 5081-T can be used to measure conductivity
in a variety of process liquids. The 5081 is compatible
with most Rosemount Analytical sensors. See the
Specifications section for details.
The transmitter has a rugged, weatherproof, corrosion-
resistant enclosure (NEMA 4X and IP65) of epoxy-painted
aluminum. The enclosure also meets NEMA 7B explo-
sion-proof standards.
The transmitter has a two-line seven-segment display.
The main measurement appears in 0.8-inch (20 mm) high
numerals. The secondary measurement, temperature
(and pH if free chlorine is being measured), appears in
0.3-inch (7 mm) high digits.
Two digital communication protocols are available: HART
(model option -HT) and FOUNDATION Fieldbus (model
options -FF and FI). Digital communications allows
access to AMS (Asset Management Solutions). Use AMS
to set up and configure the transmitter, read process vari-
ables, and troubleshoot problems from a personal com-
puter or host anywhere in the plant.
A handheld infrared remote controller or the HART and
FOUNDATION Fieldbus Model 375 communicator can also
be used for programming and calibrating the transmitter.
The remote controller works from as far away as six feet.
Housed in a rugged NEMA 4X and NEMA 7 case, the
5081T measures conductivity or resistivity in the harshest
environments. Transmitter can also be configured, using
the "Custom Curve" feature, to measure ppm, %, or a no
unit variable according to a programmable conductivity vs.
variable curve. The transmitter will automatically recog-
nize the type of RTD (Pt100 or Pt1000) being used.
Measurements are automatically corrected for the resist-
ance of the sensor cable to improve accuracy of high con-
ductivity readings. Temperature compensation choices
are linear slope correction or none (display of raw conduc-
tivity.

2
MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.2 SPECIFICATIONS
1.2.1 GENERAL SPECIFICATIONS
Enclosure: Cast aluminum containing less than 6% mag-
nesium, with epoxy polyester coating. NEMA 4X
(IP65) and NEMA 7B. Neoprene O-ring cover seals.
Dimensions: See drawing.
Conduit Openings: ¾-in. FNPT
Ambient Temperature: -4 to 149°F (-20 to 65°C)
Storage Temperature: -22 to 176°F (-30 to 80°C)
Relative Humidity: 0 to 95% (non-condensing)
Weight/Shipping Weight: 10 lb/10 lb (4.5/5.0 kg)
Display: Two-line LCD; first line shows process variable
(pH, ORP, conductivity, % concentration, oxygen,
ozone, or chlorine), second line shows process tem-
perature and output current. For pH/chlorine combina-
tion, the second line can be toggled to show pH. Fault
and warning messages, when triggered, alternate with
temperature and output readings.
First line: 7 segment LCD, 0.8 in. (20 mm) high.
Second line: 7 segment LCD, 0.3 in. (7mm) high.
Display board can be rotated 90 degrees clockwise or
counterclockwise.
During calibration and programming, messages and
prompts appear in the second line.
Temperature resolution: 0.1°C
Hazardous Location Approval: For details, see specifi-
cations for the measurement of interest.
RFI/EMI: EN-61326
Digital Communications:
HART —
Power & Load Requirements:
Supply voltage at the transmitter terminals should be at
least 12 Vdc. Power supply voltage should cover the volt-
age drop on the cable plus the external load resistor
required for HART communications (250 Ωminimum).
Minimum power supply voltage is 12 Vdc. Maximum power
supply voltage is 42.4 Vdc (30 Vdc for intrinsically safe
operation). The graph shows the supply voltage required
to maintain 12 Vdc (upper line) and 30 Vdc (lower line) at
the transmitter terminals when the current is 22 mA.
Analog Output: Two-wire, 4-20 mA output with superim-
posed HART digital signal. Fully scalable over the
operating range of the sensor.
Output accuracy: ±0.05 mA
FOUNDATION FIELDBUS —
Power & Load Requirements: A power supply voltage of
9-32 Vdc at 22 mA is required.
1.2.2 FUNCTIONAL SPECIFICATIONS
Calibration: Calibration is easily accomplished by
immersing the sensor in a known solution and entering its
value.
Automatic Temperature Compensation:
3-wire Pt 100 RTD
Conductivity: 0 to 200°C (32 to 392°F)
% Concentration: 0 to 100°C (32 to 212°F)
Diagnostics: The internal diagnostics can detect:
Calibration Error Zero Error
Temperature Slope Error Low Temperature Error
High Temperature Error Sensor Failure
Line Failure CPU Failure
ROM Failure Input Warning
Once one of the above is diagnosed, the LCD will display
a message describing the failure/default detected.
Digital Communications:
HART: PV, SV, and TV assignable to measurement
(conductivity, resistivity, or concentration), tempera-
ture, and raw conductivity. Raw conductivity is meas-
ured conductivity before temperature correction.
Fieldbus: Three AI blocks assignable to measurement
(conductivity, resistivity, or concentration), tempera-
ture, and raw conductivity. Raw conductivity is meas-
ured conductivity before temperature correction.
Execution time 75 msec. One PID block; execution
time 150 msec. Device type: 4084. Device revision: 1.
Certified to ITK 4.5.
HART option

MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.2.3 TRANSMITTER SPECIFICATIONS @ 25°C
Measured Range*: 50 to 2,000,000 µS/cm (see chart)
Accuracy: ± 1.0% of reading
Repeatability: ± 0.25% of reading
Stability: 0.25% of output range/month,
non-cumulative
Ambient Temperature Coefficient: ± 0.2% of FS/°C
Temperature Slope Adjustment: 0-5%/° C
% Concentration Ranges:
Sodium Hydroxide: 0 to 15%
Hydrochloric Acid: 0 to 16%
Sulfuric Acid: 0 to 25% and 96 to 99.7%
1.2.4 LOOP SPECIFICATIONS
Loop Accuracy: With a standard Model 228 or 225 sen-
sor with 20' cable, laboratory accuracy at 25°C can be as
good as ±2% of reading and ± 50 µS/cm.
To achieve optimum performance, standardize the sen-
sor in the process at the conductivity and temperature of
interest.
Results under real process conditions, at different tem-
peratures, or using other sensors may differ from above.
RTD accuracy: Utilizing a perfect 100 Ohm RTD after 1
point temperature standardization, temperature reading
can be as good as ±0.5°C.
RECOMMENDED SENSORS:
Model 222 Flow-Through
Model 225 Clean-In-Place (CIP)
Model 226 Submersion/Insertion
Model 228 Submersion/Insertion/Retractable
Model 242* Flow-Through
*no I.S. approval for loops of 5081-T with 242-06 or 242-08
1.3 HAZARDOUS LOCATION APPROVAL
Intrinsic Safety:
Class I, II, III, Div. 1
Groups A-G
T4 Tamb = 70°C
Exia Entity
Class I, Groups A-D
Class II, Groups E-G
Class III
T4 Tamb = 70°C
ATEX 1180
II 1 G
Baseefa03ATEX0399
EEx ia IIC T4
Tamb = -20°C to +65°C
Non-Incendive:
Class I, Div. 2, Groups A-D
Dust Ignition Proof
Class II & III, Div. 1, Groups E-G
NEMA 4X Enclosure
Class I, Div. 2, Groups A-D
Suitable for
Class II, Div. 2, Groups E-G
T4 Tamb = 70°C
Explosion-Proof:
Class I, Div. 1, Groups B-D
Class II, Div. 1, Groups E-G
Class III, Div. 1
Class I, Groups B-D
Class II, Groups E-G
Class III
Tamb = 65°C max
3
RECOMMENDED RANGES FOR TOROIDAL SENSORS
Conductivity Sensor
Model Number 226 228 225 222 (1in.) 222 (2 in.) 242
Nominal Cell Constant 1.0 3.0 3.0 6.0 4.0 *
Minimum Conductivity (µµS/cm) 50 200 200 500 500 100*
Maximum Conductivity (µµS/cm) 1,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000*
* Model 242 values depend on sensor configuration and wiring.

4
MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.4 TRANSMITTER DISPLAY DURING
CALIBRATION AND PROGRAMMING
(FIGURE 1-1)
1. Continuous display of conductivity or resistivity
readings.
2. Units: µS/cm, mS/cm, ppm, or %.
3. Current menu section appears here.
4. Submenus, prompts, and diagnostic readings
appear hear.
5. Commands available in each submenu or at
each prompt appear here.
6. Hold appears when the transmitter is in hold.
7. Fault appears when the transmitter detects a
sensor or instrument fault.
8. ♥flashes during digital communication.
1.5 INFRARED REMOTE CONTROLLER
(FIGURE 1-2)
1. Pressing a menu key allows the user access to
calibrate, program, or diagnostic menus.
2. Press ENTER to store data and settings. Press
NEXT to move from one submenu to the next.
Press EXIT to leave without storing changes.
3. Use the editing arrow keys to scroll through lists
of allowed settings or to change a numerical set-
ting to the desired value.
4. Pressing HOLD puts the transmitter in hold and
sends the output current to a pre-programmed
value. Pressing RESET causes the transmitter
to abandon the present menu operation and
return to the main display.
FIGURE 1-2. INFRARED REMOTE CONTROLLER
1.
4.
3.
2.
CALIBRATE PROGRAM DIAGNOSE
/-[5ES-U1
EXIT NEXT ENTER
mS/cm
F
A
U
L
T
H
O
L
D
6
7
8
3
4
1
2
5
FIGURE 1-1. TRANSMITTER DISPLAY DURING
CALIBRATION AND PROGRAMMING
The program display screen allows access to calibration and
programming menus.
♥
#"c""

5
MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.6 HART COMMUNICATIONS
1.6.1 OVERVIEW OF HART COMMUNICATION
HART (highway addressable remote transducer) is a digital communication system in which two frequencies are superim-
posed on the 4 to 20 mA output signal from the transmitter. A 1200 Hz sine wave represents the digit 1, and a 2400 Hz
sine wave represents the digit 0. Because the average value of a sine wave is zero, the digital signal adds no dc compo-
nent to the analog signal. HART permits digital communication while retaining the analog signal for process control.
The HART protocol, originally developed by Fisher-Rosemount, is now overseen by the independent HART
Communication Foundation. The Foundation ensures that all HART devices can communicate with one another. For more
information about HART communications, call the HART Communication Foundation at [phone]. The internet
address is http://www.hartcomm.org.
1.6.2 HART INTERFACE DEVICES
HART communicators allow the user to view measurement data (pH, ORP and temperature), program the transmitter, and
download information from the transmitter for transfer to a computer for analysis. Downloaded information can also be sent
to another HART transmitter. Either a hand-held communicator, such as the Rosemount Model 375, or a computer can be
used. HART interface devices operate from any wiring termination point in the 4 - 20 mA loop. A minimum load of 250 ohms
must be present between the transmitter and the power supply. See Figure 1-3.
If your communicator does not recognize the Model 5081-T transmitter, the device description library may need updating.
Call the manufacturer of your HART communication device for updates.
4-20 mA + Digital
250
ohm
Control System
Computer
Model 5081-T-HT
Two-wire
Transmitter
Bridge
Hand Held
Communicator
(“Configurator”)
FIGURE 1-3. HART Communicators.
Both the Rosemount Model 375 (or 275) and a computer can be used to communicate
with a HART transmitter. The 250 ohm load (minimum) must be present between the
transmitter and the power supply.

6
MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.8 ASSET MANAGEMENT SOLUTIONS
Asset Management Solutions (AMS) is software that helps plant personnel better monitor the performance of analytical
instruments, pressure and temperature transmitters, and control valves. Continuous monitoring means maintenance per-
sonnel can anticipate equipment failures and plan preventative measures before costly breakdown maintenance is
required.
AMS uses remote monitoring. The operator, sitting at a computer, can view measurement data, change program settings,
read diagnostic and warning messages, and retrieve historical data from any HART-compatible device, including the Model
5081-T transmitter. Although AMS allows access to the basic functions of any HART compatible device, Rosemount
Analytical has developed additional software for that allows access to all features of the Model 5081-T transmitter.
AMS can play a central role in plant quality assurance and quality control. Using AMS Audit Trail, plant operators can track
calibration frequency and results as well as warnings and diagnostic messages. The information is available to Audit Trail
whether calibrations were done using the infrared remote controller, the Model 375 HART communicator, or AMS software.
AMS operates in Windows 95. See Figure 1-5 for a sample screen. AMS communicates through a HART-compatible
modem with any HART transmitters, including those from other manufacturers. AMS is also compatible with
FOUNDATION™Fieldbus, which allows future upgrades to Fieldbus instruments.
Rosemount Analytical AMS windows provide access to all transmitter measurement and configuration variables. The
user can read raw data, final data, and program settings and can reconfigure the transmitter from anywhere in the plant.
1.7 FOUNDATION FIELDBUS
Figure 1-4 shows a 5081-T-FF being used to measure conductivity. The figure also shows three ways in which Fieldbus
communication can be used to read process variables and configure the transmitter.
FIGURE 1-4. CONFIGURING MODEL 5081-T TRANSMITTER WITH FOUNDATION FIELDBUS

MODEL 5081-T SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
FIGURE 1-5. AMS MAIN MENU TOOLS
7

8
MODEL 5081-T SECTION 2.0
INSTALLATION
SECTION 2.0
INSTALLATION
2.1 Unpacking and Inspection
2.2 Orienting the Display Board
2.3 Mechanical Installation
2.4 Power Supply/Current Loop — Model 5081-T-HT
2.5 Power Supply Wiring for Model 5081-T-FF/FI
2.1 UNPACKING AND INSPECTION
Inspect the shipping container. If it is damaged, contact the shipper immediately for instructions. Save the box. If there is
no apparent damage, remove the transmitter. Be sure all items shown on the packing list are present. If items are miss-
ing, immediately notify Rosemount Analytical.
Save the shipping container and packaging. They can be reused if it is later necessary to return the transmitter to the factory.
2.2 ORIENTING THE DISPLAY BOARD
The display board can be rotated 90 degrees, clockwise or counterclockwise, from the original position. To reposition the
display:
1. Loosen the cover lock nut until the tab disengages from the circuit end cap. Unscrew the cap.
2. Remove the three bolts holding the circuit board stack.
3. Lift and rotate the display board 90 degrees, clockwise or counterclockwise, into the desired position.
4. Position the display board on the stand offs. Replace and tighten the bolts.
5. Replace the circuit end cap.
2.3 MECHANICAL INSTALLATION
2.3.1 General information
1. The transmitter tolerates harsh environments. For best results, install the transmitter in an area where temperature
extremes, vibrations, and electromagnetic and radio frequency interference are minimized or absent.
2. To prevent unintentional exposure of the transmitter circuitry to the plant environment, keep the security lock in place
over the circuit end cap. To remove the circuit end cap, loosen the lock nut until the tab disengages from the end cap,
then unscrew the cover.
3. The transmitter has two 3/4-inch conduit openings, one on each side of the housing. Run sensor cable through the left
side opening (as viewed from the wiring terminal end of the transmitter) and run power wiring through the right side
opening.
4. Use weathertight cable glands to keep moisture out of the transmitter.
5. If conduit is used, plug and seal the connections at the transmitter housing to prevent moisture from getting inside the
transmitter.
NOTE
Moisture accumulating in the transmitter housing can affect the performance of the trans-
mitter and may void the warranty.
6. If the transmitter is installed some distance from the sensor, a remote junction box with preamplifier in the junction box
or in the sensor may be necessary. Consult the sensor instruction manual for maximum cable lengths.

9
MODEL 5081-T SECTION 2.0
INSTALLATION
FIGURE 2-1. Mounting the Model 5081-T Toroidal Conductivity Transmitter on a Flat Surface
MILLIMETER
INCH
2.3.2 Mounting on a Flat Surface.
See Figure 2-1.

10
MODEL 5081-T SECTION 2.0
INSTALLATION
FIGURE 2-2. Using the Pipe Mounting Kit to Attach the Model 5081-T Conductivity Transmitter to a Pipe
MILLIMETER
INCH
2.3.3 Pipe Mounting.
See Figure 2-2. The pipe mounting kit (PN 2002577) accommodates 1-1/2 to 2 in. pipe.
DWG. NO. REV.
40308104 G
DWG. NO. REV.
40308103 C

11
MODEL 5081-T SECTION 2.0
INSTALLATION
TABLE 2-1. Model 5081-T Sensor Selection
2.3.4 Inductive Loops.
The Model 5081-T conductivity transmitter is designed to make accurate measurements while in contact with the process
stream. Measurements can also be tailored to high temperature and/or high pressure streams.
2.3.5 Sensor Selection.
All Rosemount Analytical contacting conductivity sensors with PT100 RTD or PT1000 RTD are compatible with the Model
5081-T transmitter. Please refer to Figures 3-5 thru 3-7 for appropriate sensor to transmitter wiring. The sensor cable
should be routed through the left inlet closest to the connector.
Choose an inductive conductivity sensor that is appropriate for your process conditions and range of conductivity meas-
urement.
NOTE: Values shown are for 25°C conductivity with a temperature slope of 2% per
degree C. The maximum range value will be lower for solutions with a higher
temperature slope. Minimum conductivity depends on sensor.
RECOMMENDED RANGES FOR TOROIDAL SENSORS
Conductivity Sensor
Model Number 226 228 225 222 (1in.) 222 (2 in.) 242
Nominal Cell Constant 1.0 3.0 3.0 6.0 4.0 *
Min. Conductivity (µµS/cm) 50 200 200 500 500 100*
Max. Conductivity (µµS/cm) 1,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000*
* Model 242 values depend on sensor configuration and wiring.
RECOMMENDED SENSORS:
Model 222 Flow-Through
Model 225 Clean-In-Place (CIP)
Model 226 Submersion/
Insertion
Model 228 Submersion/
Insertion/
Retractable
Model 242 Flow-Through*
* Model 242-06 or 242-08 with 5081T
do not have Intrinsically Safe
approvals.

12
MODEL 5081-T SECTION 2.0
INSTALLATION
2.4 POWER SUPPLY/CURRENT LOOP
— MODEL 5081-T-HT
2.4.1 Power Supply and Load Requirements.
Refer to Figure 2-3.
The minimum power supply voltage is 12.5 Vdc
and the maximum is 42.4 Vdc. The top line on the
graph gives the voltage required to maintain at
least 12.5 Vdc at the transmitter terminals when
the output signal is 22 mA. The lower line is the
supply voltage required to maintain a 30 Vdc ter-
minal voltage when the output signal is 22 mA.
The power supply must provide a surge current dur-
ing the first 80 milliseconds of start-up. For a 24 Vdc
power supply and a 250 ohm load resistor the surge
current is 40 mA. For all other supply voltage and
resistance combinations the surge current is not
expected to exceed 70 mA.
For digital (HART or AMS) communications, the load must be at least 250 ohms. To supply the 12.5 Vdc lift off voltage at
the transmitter, the power supply voltage must be at least 18 Vdc.
For intrinsically safe operation the supply voltage should not exceed 30.0 Vdc.
2.4.2 Power Supply-Current Loop Wiring. Refer to Figure 2-4.
Run the power/signal wiring through the
opening nearest terminals 15 and 16. Use
shielded cable and ground the shield at the
power supply. To ground the transmitter,
attach the shield to the grounding screw on
the inside of the transmitter case. A third
wire can also be used to connect the trans-
mitter case to earth ground.
NOTE
For optimum EMI/RFI immunity, the
power supply/output cable should be
shielded and enclosed in an earth-
grounded metal conduit.
Do not run power supply/signal wiring in
the same conduit or cable tray with AC
power lines or with relay actuated signal
cables. Keep power supply/ signal wiring at
least 6 ft (2 m) away from heavy electrical
equipment.
An additional 0-1 mA current loop is avail-
able between TB-14 and TB-15. A 1 mA cur-
rent in this loop signifies a sensor fault. See
Section 3.0 for wiring instructions. See
Section 8.4 or 10.6 and Section 12.0 for
more information about sensor faults.
FIGURE 2-3. Load/Power Supply Requirements
FIGURE 2-4. Model 5081-T-HT Power Wiring Details

13
MODEL 5081-T SECTION 2.0
INSTALLATION
2.5 POWER SUPPLY WIRING FOR
MODEL 5081-T-FF/FI
2.5.1 Power Supply Wiring. Refer to Figure 2-5 and
Figure 2-6.
Run the power/signal wiring through the opening nearest
terminals 15 and 16. Use shielded cable and ground the
shield at the power supply. To ground the transmitter,
attach the shield to the grounding screw on the inside of
the transmitter case. A third wire can also be used to con-
nect the transmitter case to earth ground.
NOTE
For optimum EMI/RFI immunity, the power sup-
ply/output cable should be shielded and
enclosed in an earth-grounded metal conduit.
Do not run power supply/signal wiring in the same con-
duit or cable tray with AC power lines or with relay actu-
ated signal cables. Keep power supply/signal wiring at
least 6 ft (2 m) away from heavy electrical equipment. FIGURE 2-5. Typical Fieldbus Network Electrical
Wiring Configuration
FIGURE 2-6. Model 5081-T-FF Power Wiring Details
5081-T
Transmitter
5081-T
Transmitter
9 - 32

14
MODEL 5081-T SECTION 3.0
WIRING
SECTION 3.0
WIRING
3.1 Sensor Wiring
3.2 Electrical Installation
3.1.1 WIRING THROUGH A JUNCTION BOX
The sensor can be wired to the analyzer through a remote junction box (PN 23550-00). Wire the extension cable and sen-
sor cable point-to-point. Refer to the sensor instruction manual for more details.
Factory-terminated (PN 23294-05) and unterminated (PN 9200276) connecting cable are available. The use of factory-termi-
nated cable is strongly recommended. To prepare unterminated cable for use, follow the instructions in the sensor instruction
manual.
For maximum EMI/RFI protection, the outer braid of the sensor cable should be connected to the outer braided shield of
the extension cable. At the instrument, connect the outer braid of the extension cable to earth ground.
3.1 SENSOR WIRING
Wire sensor as shown below in Figure 3-1. Keep sensor wiring separate from power wiring. For best EMI/RFI protection,
use shielded output signal cable in an earth-grounded metal conduit. Refer to the sensor instruction manual for more
details.
FIGURE 3-1. Wiring Model 5081T-HT