Honeywell Mini-AT User manual

Honeywell Process Solutions
Mini-AT
High Performance,
PTZ Electronic Volume Corrector
User Manual
October 2020
V 3.04
Honeywell

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Mini-AT User Guide
Table of Contents
Introduction ..............................................................................................................................................5
Specifications ...........................................................................................................................................6
Connectors/Jumpers (location) ..................................................................................................................8
Quick Start Guide ....................................................................................................................................10
Correction Factors to Metered Volume .....................................................................................................13
How the Mini-AT Works .........................................................................................................................15
Receiving the Mini-AT .............................................................................................................................19
Installation (Standard) .............................................................................................................................20
Installation (without an Instrument Drive) .................................................................................................23
Battery Packs (Installing or Changing) ........................................................................................................28
Serial Connector .....................................................................................................................................30
LCD Diagnostic Function (Linking) ...........................................................................................................30
Modem, Communicating with the Mini-AT ...............................................................................................31
Alarms ...................................................................................................................................................36
Pulse Outputs (Alarms) ...........................................................................................................................37
Pulse Outputs (Volume) ..........................................................................................................................38
Mini-AT Operating Modes ......................................................................................................................45
Meter Reader Mode (Detailed Description) .............................................................................................47
Flow Rate Calculation .............................................................................................................................58
Audit Trail ...............................................................................................................................................59
Instrument Calibration ..............................................................................................................................60
Jumpers - Main Board ............................................................................................................................73
Firmware Reprogramming .......................................................................................................................77
Taking the Mini-AT Unconfigured ............................................................................................................87
Shutdown, Putting the Mini-AT into .........................................................................................................88
Item Code List .......................................................................................................................................89
Parts, List, Mini-AT Door .......................................................................................................................140
Parts, List, Meter Mount Mini-AT .........................................................................................................140
Parts, List, Wall Mount Mini-AT ...........................................................................................................142
Drawing, Installation for UL Div. 1 Hazardous Locations ..........................................................................144
Drawing, Installation for UL Div. 2 Hazardous Locations ..........................................................................146
Drawing, Installation for CSA Div. 1 Hazardous Locations ........................................................................147
Drawing, Installation with Turbine Meter (CSA) .......................................................................................149
Security ..............................................................................................................................................151
Index ..................................................................................................................................................153

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Revision List
1.00 Initial Release December 1998
2.00 Format Change to larger paper
Added: p62
p37-38
p39
p27
p134
p14
p46-47
p8
Modified: p32-34
p126-131
p125 December 2000
2.10 Added: p61
p124
Modified: p40
p42-43
p59-61
p27 November 2001
2.11 Added: p46-47
Modified: p40
p82
p129-132 June 2003
3.00 Added: p33-34
p138-143
p77-86
p8
p73 May 2004
p81 January 2008
Modified:
3.01 Modified:
Audit Trail
Automatic Call-in
HELP Mode
LCD Diagnostic Display (linking)
Messenger Modem Wiring Diagram
PLog
Pulse Scaling Tables
Quick Start Guide
Firmware Upgrade Procedure
Hazardous Location Drawings
Primary Components Drawing
Flow Rate Calculation
Zero Flow Rate Items
Alarm Table
Pulse Output Configuration
Meter Reader Mode
Linking Diagnostic Display
Pulse Output Configuration Examples
Alarm Table
Default Item Values 056-058
CSA Installation drawings
Modem Connection Drawings
Parts List Drawings
Firmware Upgrade Procedure
Main Board Layout Drawing
Jumper Settings
Changed 3 and 4 to 5 and 6 pins
3.03 Modified: Honeywell update October 2010
Moved:
3.04 Modified: Security Section added October 2020

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Introduction:
The Mini-AT is a full featured, stand alone, electronic gas volume corrector
. Its standard mounting is on rotary
,
turbine, and diaphragm meters that have a rotating shaft (instrument drive) output. The Mini-AT is also com-
patible with meters that provide high or low frequency meter pulses when the appropriate interface board is
installed. The purpose of this Operators Guide is to provide the information necessary to install and use the
Mini-AT.
The Mini-AT combines the size of Mercor Mini with the audit trail functions of the ECAT; hence, the
name Mini-AT. A PC (desktop or laptop computer) is needed to configure and download the Mini-AT
using Mini-AT Link or MasterLink32 software. Detailed information regarding the software is avail-
able through the Mini-AT Link Software Users Manual, or through the MasterLink32 help screens.
In addition to its small, sturdy case, the Mini-AT offers these and other features:
•High-performance, low power microprocessor
•Extended battery life
•Extended Audit Trail memory capacity (140+ days of hourly)
•FLASH memory (hence, no plug-in EPROMs)
•Firmware updates via serial port
•Jumper selectable Form-A or Form-C pulse output
•Jumper selectable Pulse Widths for volume pulses
•Dual serial ports (local and modem) with independent baud rate settings
•High-speed data transfers (up to 38.4 kbaud)
•On-board surge protection for serial & pulse data
•On-board connectors for a second pressure & temperature transducer
•Logging of a 2nd pressure (for monitoring pressure)
•Call-In via Alarm Pulse or AT commands

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Specifications
Input Volume
• Dual Dry-reed switches, one pulse per each meter revolution
• Uncorrected volume totalized on mechanical index, also displayable on LCD
• Input pulse counting continues with dead or removed main battery
Input Pressure
• Precision strain gauge pressure transducer compensated to minimize ambient temperature effects
• Standard Transducer Ranges:
Pressure Range Transducer Type
PSI BAR
0-1 0.07 Gauge only
0-3 0.2 Gauge only
0-6 0.4 Gauge only
0-15 1.0 Gauge only
0-30 2.0 Gauge or Absolute
0-60 4.0 Gauge or Absolute
0-100 7.0 Gauge or Absolute
0-300 20 Gauge or Absolute
0-600 41 Gauge or Absolute
0-1000 70 Gauge or Absolute
0-1500 100 Gauge or Absolute
• Live display of input pressure on LCD
Input Temperature
• Highly stable, solid state temperature sensor in a sealed ¼” diameter, 9” long stainless steel probe
with 6’ armored conductor and ½” NPT nylon slip-along fitting to match thermowell
• Range: -40OF. to 170OF. (-40OC. to 76.6OC.)
• Live display of input temperature on LCD
Corrected Volume
• Corrected to desired Base Pressure & Base Temperature
• Corrected for Supercompressibility (NX-19 or AGA-8)
• Selectable volume units, both Metric & Imperial
• Displayed continuously on 8-digit x ½” LCD
Power
• 5.5 to 9.0 VDC
• Battery life: 3 years+ (w/ Alkaline Battery Pack)
• On-board UPS (3-AA Alkaline battery)
• Lithium, AC or Solar (Optional)
• Main battery voltage, Backup battery voltage and alarms displayable on LCD

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Output Volume For data collection systems
• Jumper selectable for: one Form-C or two Form-A
• Jumper selectable pulse width (default = 62.5 msec.)
• One mechanical (Dry-reed) switch for uncorrected volume (second switch optionally available)
• SPA Board optionally available
Memory
• Audit Trail: 140+ days of hourly
• Event Log: 500+ records
• Alarm Log: 200+ records
• Flash: Resident firmware (upgradable via laptop)
• E2PROM: Resident pressure compensation coefficients and critical calibration/
configuration item values
Accuracy
Maximum error at reference conditions including linearity, repeatability and hysteresis.
• Computation: ±0.1% of corrected vol. reading
• Pressure transducer: ±0.25% of full scale
• Temperature Sensor: ±0.5OF
• Combined computation: ±0.25% of full scale
(pressure & temperature)
Ambient Temperature Effects
From -40OF. to 170OF. (-40OC. to 76.6OC. )
• Computation: ±0.1% of corrected vol. per 100OF.
• Pressure Transducer: ±0.3% of full scale per 100OF.
• Temperature Sensor: No effect
Long Term Stability
• Computation : ±0.1% of corrected vol. per year
• Pressure Transducer: ±0.3% of full scale per year
• Temperature Sensor: ±0.2% per year
Environmental Conditions
• Ambient Temperature: -40OF. to 170OF. (-40OC. to 76.6OC. )
• Ambient Humidity: 0 to 100% noncondensing
Enclosure
• Cast aluminum alloy, surface treated, baked enamel paint
• Lexan viewing windows for; uncorrected mechanical index, corrected volume LCD
• Stainless steel door latch with padlock hasp
• Mounting plate with gasket and bolts to accommodate most meters
Certifications
• UL certified for Class I, Divisions 1 & 2, Group D
• CSA certified for Class I, Divisions 1 & 2, Groups C & D

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Figure 1
Diagram of the Mini-AT board,
(location of primary connections and jumpers)
Terminal Strip
Connector for
Modem
Backup Battery Pack
(3-AA alkaline)
Pulse Outputs
JB 30
JB 31
JB 29
JB 24
TB2
J3
J6
TB1
J7 J8
J26
J4
J10
J5
J28
J27
J20 J2 J22
JB900
J23
J21
J9
JB 32

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Connector/Jumper Purpose
J2 Connection for Field Calibrator
J3 Connection for LCD Display
J4 Connection for KYZ Pulse Channels
J5 Connection for Temperature-1 input
J6 Connection for local Serial Port Connector
J7 Connection #1 for Main Battery
J8 Connection #2 for Main Battery
J9 Connection for UncVol Switch Input
J10 Connection for PCor input
J20 Connection for Aux. Modem
J21 Connection for power to Aux. Modem
J22 Connection for SPI Bus
J23 Connection for BDM Port
J26 Connection for Backup Battery
J27 Connection for Temperature-2 input
J28 Connection for Plog input
JB24 Jumpers (5-position) to enable:
Loader/Unconfigure/Flash Upgrade/Serial Access/
Event Log Lock
JB29 Jumpers (2-position) to select pulse width for KYa
and KYb
JB30 Jumper to select Form-A or Form-C
JB31 Jumper to select Form-A or Form-C
JB32 Jumper to bypass current limit resistor for specific
Pulse Input Circuits
JB900 Jumper to select Modem or Aux. Modem
TB1 Surge protected connections for Volume Pulse and
Alarm Pulse Output
TB2 Surge protected connections for Modem and
Alarm Pulse

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Mini-AT User Guide
Quick Start Guide
The following steps will guide you to getting the Mini-AT instrument installed and operational.
1. Carefully unpack the instrument and verify that there is no shipping damage, also verify that nothing is
missing from the shipment.
2. Open the case door and make sure there are no loose connections or loose hardware.
3. Install six new D-cell alkaline batteries if using the Alkaline Receptacle Pack. Plug the main battery
connector into either J7 or J8. Hang the battery pack on the screws of the battery hanger plate located
inside the door. Install the battery cover if using a disposable pack.
4. Plug the memory battery into J26. You may initially see the letter “P” across the LCD.
Alkaline
Receptacle
Pack
Alkaline
Receptacle
Pack
Memory
Battery
J26 Memory
Battery Connector
J7, J8
Main Battery
Connectors
Battery
Connector
Mounting
Screws

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5. V
erify that digits appear in the LCD display (usually all zeroes). Scroll through the meter reader list by
swiping a mag wand down the right side of the display window to verify the instrument is operating.
6. Connect a standard serial cable from the Mini-AT serial connector to a computer serial port.
7. Run MasterLink32 software and use the “Set Instr. Date/T
ime via Computer” selection in the File Menu
to set the date and time in the instrument. (Com Port and baud rate may need to be set for the Computer
Serial Port. Default baud rate is 9600.)
8. Use MasterLink32 to verify that company and site specific items are set properly, especially item 98
(Meter Index Code).
9. Use the “Disconnect Link” function in the Instrument menu to return the Mini-AT back to corrector
mode. Remove the I/O cable from the back of the instrument.
10. Position the Mini-AT on the meter, making sure that the wriggler is aligned properly. Bolt the Mini-AT
to the meter using the mounting bolts and gasket provided.
11. Verify the Test Hand rotates in the clockwise direction. If not, remove the black mechanical index
Numeric Display
Mag Wand
(Start at top of label and
stroke downward to bottom
right corner)
RS-232 Port
Back View
Serial Port
(i.e.COM1, COM2,)
I/O Cable
P/N 40-1629
Pressure Connector
Plug for future
expansion
Laptop Computer
Mini-AT
Optional 2nd
Pressure Connector
Warning: Connections to the RS-232 port are
permitted only in non-hazardous locations

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assembly and shift the lower bevel gear to the proper location.
12. Connect the pressure line to the 1/4" NPT fitting at the back of the instrument.
13. Insert the slip-along fitting into the thermowell, and place the temperature probe into the slip-along
fitting, sliding the probe down until it bottoms out in the thermowell before tightening the slip-along nut
14. At this point the instrument should be ready for operation.
Thermowell
Temperature
Probe Slip-Along
Fitting
Bevel Gear DOWN for CW Bevel Gear UP for CCW
Pressure
Line
Optional 2nd
Pressure Port
1/4” NPT
fitting
Mini-AT
(back view)

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Correction Factors to Metered Volume
Ideal or perfect gases follow the relationship of Boyle’s Law for pressure effect and Charles’ Law for
temperature effect, which can be stated: The volume of any definite weight of a perfect gas varies
inversely with change in absolute pressure and directly with change in absolute temperature. The
equation for this relationship of the two laws is expressed as follows:
V1 P1 V2 P2
T1 T2
The Symbols V1, P1 and T1 refer to the original volume, pressure and temperature while V2, P2 and T2
refer to the volume, pressure and temperature of the new or changed conditions. Rearranging the
equation and rewriting subscripts, we can express it as follows:
Where: Vb = gas volume (cu. ft.) at base condition corrected
Pb = absolute base pressure (psia)
Tb = absolute base temperature (deg. R)
Vm = gas volume metered (cu. ft.) uncorrected
Pm = absolute meter pressure (psia)
Tm = absolute meter temperature (deg. R)
Pressure Factor Fp
The pressure factor (Fp) to apply to metered volume is expressed by the Boyle’s Law relationship as
follows:
Pm Meter pressure (PSIG) + atmospheric pressure (PSIA)
Fp
Pb Base pressure (PSIA)
Each increment of meter pressure represents a different pressure factor. As the flowing gas pressure (Pm)
changes, the Mini-AT automatically applies the pressure factor (Fp) to the metered volume (Vm).
Temperature Factor Ft
The temperature factor (Ft) to apply to metered volume is expressed by the Charles’ Law relationship
as follows:
Tb Base temperature, deg. F + 459.67
Ft
Tm Meter temperature, deg. F + 459.67
Each increment of meter temperature represents a different temperature factor. Therefore, as the
flowing gas temperature (Tm) changes, the Mini-AT automatically applies the temperature factor (Ft)
to the metered volume.
Pm Tb
Vb Vm X X
Pb Tm

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Supercompressibility Factor Fpv
Gases actually behave in a manner slightly different from what the ideal gas laws indicate. This deviation
depends on the molecular composition of the gas and the specific gravity as well as the pressure and
temperature. Natural gas, for instance, compresses by a greater amount than that computed by Boyle’s
Law and hence the term “supercompressibility” is used for this deviation. It is small at very low pressure,
but becomes substantial as the pressure increases. The Mini-AT automatically applies the
supercompressibility factor and therefore the equation for total volume correction which the Mini-AT
applies to metered volume, is expressed as:
Vb = Vm x Fp x Ft x (Fpv)2
Where: Vb = volume corrected to base conditions
Vm = metered volume read from the meter index
Fp = pressure factor
Ft = temperature factor
Fpv = supercompressibility factor determined from AGA 3 /
NX-19 or AGA 8, from the AGA Manual for Determina-
tion of Supercompressibility Factors for Natural Gas. The
values of Fpv are derived in the tables for use with orifice
meters, which are square root function measurements. So
the flow equation for linear volume meters must square the
value of Fpv.
The Mini-AT automatically squares the supercompressibility factor displayed, which is based on the
pressure and temperature sensed at the meter. The resulting volume readout is corrected for pres-
sure, temperature, and supercompressibility.

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How the Mini-AT Works
The Mini-AT is a dedicated microcomputer that uses precision sensors to measure gas pressure and
temperature and corrects metered volume. The electronic circuits are powered by the battery pack
located in the case door. The battery voltage is regulated to the various voltages required by the
remaining circuits. While in the Corrector Mode, most of the electronic circuitry is in an
‘unpowered’ (asleep) state. When the magnet disc rotates and actuates the input switches, the
electronics are energized and begins its correction cycle. The input switches not only 'wake-up' the
electronics, but are also the input for uncorrected volume. The volume that each input closure
represents is defined by Item Code 098 multiplied by the scaling value at Item Code 114.
Once the instrument 'wakes-up', the computer program in firmware instructs the CPU (microproces-
sor) to obtain analog measurements. At least five analog signals, PCor gas pressure, gas tempera-
ture, main battery voltage, memory battery voltage and case temperature, are multiplexed through
the A/D converter and sent to the microprocessor for processing.
The microprocessor converts the digitized analog signals to an equivalent numeric value and stores
this information in memory. PCor Gas Pressure is stored at Item Code 008, Gas Temperature is
stored at Item Code 026, Main Battery Voltage is stored at Item Code 048, Backup Battery Voltage
is stored at Item Code 051 and Case Temperature is stored at Item Code 031. After all measure-
ments are obtained, the microprocessor compares the measured values to the parameter limits
already in memory, i.e., PCor pressure low limit, temperature high limit, battery low limit, etc. If
any of the measured parameters are out of range, the microprocessor jumps to an alarm subroutine.
Except for battery Shutdown Voltage limit exceeded, the alarm subroutine activates the appropriate
alarm item code, turns on the alarm indicator and transmits an alarm pulse out the alarm channel.
After the alarm sequence is complete, the microprocessor returns to its normal functions.
At the time of a full 'wake-up', if the battery Shutdown Voltage low-limit (item code 50) is ex-
ceeded, the microprocessor activates the alarm indicator (all seven LCD decimal points are turned-
on), transmits an alarm pulse on the alarm channel, spells out the word "HELP" on the LCD. Under
these conditions, the "HELP" message is displayed for as long as there is enough battery voltage to
maintain the display. The Mini-AT is no longer correcting the gas volume, however, the mechani-
cal index is still functional. To restore normal instrument operation, remove the dead battery and
replace it with a fresh one.
After the alarm subroutine is complete, or if no alarm conditions are present, the microprocessor
computes new correction factors based on the new measurements and parameters already in
memory. Parameters in memory are items such as; Base Pressure, Base Temperature, Specific
Gravity, etc. The new correction factors are then applied to the uncorrected volume input to obtain
the corrected volume. The amount of corrected volume just calculated is then added to the totalized
corrected volume stored at Item Code 000. The uncorrected volume just received is also added to
the totalized uncorrected volume stored at Item Code 002.

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When the microprocessor has completed the updating of its memory registers and item codes, it will update
the LCD with the new corrected volume information. The microprocessor will then power down most of
the main board circuits and transmits corrected volume pulses, if Item Codes 093, 094 or 095 were config-
ured for ‘pulse output’. Otherwise, the main board will go back into the 'asleep' mode waiting for the next
uncorrected volume input pulse.
Three other conditions can cause the Mini-AT to 'wake-up' while in the Corrector Mode. They are; a
Mag Wand Input, a Serial Communication Link or a scheduled audit trail log entry. A Mag Wand
Input is caused by passing a magnetic wand across the Mag Read Switch located on the LCD Dis-
play Board. A Mag Wand Input will cause the microprocessor to initiate the Meter Reader Mode. A
'wake-up' caused by a Serial Communication Link will allow the instrument to 'talk' to serial devices
connected to either of the RS-232 ports (local or modem). An audit trail wake-up occurs at regular
time intervals as specified by the user, at Item Code 202. In all three cases, the microprocessor will
initiate a full correction cycle as described above. Except for audit trail wake-ups, after the comple-
tion of the correction cycle, most main board circuits will remain energized while the instrument is
performing the user requested tasks.
Drive Input
A universal mounting bracket, containing a standard digital index for indicating uncorrected volume,
is used to mount the Mini-AT to a meter. A reversing gear mechanism permits changing the index
rotation to match meter rotation (see figures 2 and 3). Input of uncorrected volume is made by
magnetically operated reed switches. A magnet is located on a disc/shaft and is rotated by the meter
output shaft. There is very little torque loading on the meter. The dual input switches allow contin-
ued operation if one switch should fails. Input switch #1 is located along the right edge of the Input
Switch Board (S1) and switch #2 is located just to its left (S2). If a switch failure is detected, an
alarm is displayed.
PCor Pressure System
The PCor pressure sensing system incorporates a precision strain gage pressure transducer, located inside the
Mini-AT enclosure with a 1/4" NPT female case connection. A valve kit with shut-off valve, tubing and fittings
is optionally available to make the pressure connection to the meter/pipeline. A plug-in cable is used to make
the connection from the pressure transducer to the main circuit board at J10. This transducer is used for
calculating the pressure correction factor, item 044.
PLog Pressure System (optional)
The optional PLog pressure sensing system incorporates a separate precision strain gage pressure transducer,
also located inside the Mini-AT enclosure with a 1/4" NPT female case connection. The Plog transducer can
be a different range and type than the PCor transducer. A valve kit with shut-off valve, tubing and fittings is
optionally available to make the PLog pressure connection to the meter/pipeline. A plug-in cable is used to make
the connection from the PLog pressure transducer to the main circuit board at J26. This transducer allows the
logging of a 2nd pressure which is initiated by a time interval (not volume) set by item 401. It is usually used to
monitor the upstream or downstream pressure.
Temperature System
The temperature system consists of a highly stable, solid state transducer, connected to the Mini-AT through
a 6 foot length of armored conductor. The stainless steel probe is 1/4" diameter by 9 inches long and is provided
with a slip-along fitting for the matching thermowell in the meter piping.

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Supercompressibility Correction
Supercompressibility correction is included in the basic calculations if Item Code 110 is configured to
“LIVE”. Specific gravity (item 053), mol percent of N2 ( item 054) and mol percent of CO2 (item 055)
should be updated by the user so that the Mini-AT can provide accurate and continuous correction for
the specified gas composition based on actual sensed pressure and temperature.
Below is a partial listing of various Mini-AT Item Codes that store correction parameters:
LCD Display and Scroll Function
A single 8 digit, 1/2" high numeric display is mounted in the door of the Mini-AT and is viewable from the
outside with the door closed. The LCD (Liquid Crystal Display) normally displays the corrected volume
with 4, 5, 6, 7, or 8 digits. The LCD can be configured to display any Mini-AT item. The LCD is also used
to indicate alarm conditions and also to display the items configured into the Meter Reader List.
Passing a Mag W
and along the right side of the corrected volume LCD window (or pressing on the optional
pushbutton) allows the user to view a pre-selected sequence of instrument readings. MasterLink software
is used to select which instrument readings are to be displayed and the order in which they appear.
Computation Intervals
The Mini-AT's computation interval is referred to as a 'Full Wake-up'. During a full wake-up, power is applied
to all electronic circuits so that pressure, temperature and voltage measurements may be obtained, and a new
Total Correction Factor (Item Code 043) is calculated. The LCD and volume registers are also updated. The
measured parameters are compared to the alarm limits and an alarm is triggered if limits are exceeded. After
completion of these tasks, the circuitry will return to the 'Asleep' mode and begin transmitting corrected volume
pulses if item code 093, 094 or 095 is set for pulse out. The full wake-up interval can be adjusted by changing
the value (N) at Revs Per Wake-up parameter at Item Code 124. Values for N can be a number from 1 to 15,
the default value is “1”.
Instrument wake-up due to meter rotation other than the Nth revolution are referred to as 'Intermediate Wake-
ups'. During an intermediate wake-up, gas pressure and gas temperature are not measured and the LCD is not
updated. However, the last calculated correction factors are used to update the volume registers. If the Mini-
AT has been configured to output volume pulses, the pulses will be transmitted at the end of each intermediate
wake-up. Since the analog circuits are not active and the LCD is not updated during an intermediate wake-up,
much less battery power is used as compared to an instrument with Revs Per Wake-up equal to one (N=1).
Regardless of the value of “N”, audit trail logging will always occur at the time interval specified at item 202.
Most Interval Daily Previous Day
Current Average Average Average
Gas Pressure 008 206 256 185
Gas Temperture 026 207 257 186
Super (Fpv) 047 187 188 189
Super (Fpv)2 116 - - -

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Access Levels for Operating Personnel
There are four levels of instrument access available on the Mini-AT for operating personnel. The first
level, referred to as the Corrector Mode, displays the corrected volume on the LCD and the uncorrected
volume on the digital mechanical index. The Corrector Mode also provides a visual indication for
instruments in an alarm condition.
The second level available is referred to as the Meter Reader Mode. Meter readers can use a magnetic
wand to scroll the values of specific items on the LCD. Uncorrected and corrected volumes, a limited
number of pre-specified values, such as; gas pressure gas temperature, battery voltage, and any alarms
that may be activated, can be part of the meter reader list. The meter reader cannot make any changes
that will effect the configuration of the Mini-AT.
The third level of access available is called: Level 1 Access Mode. This level of access requires an IBM
compatible computer, MasterLink32 or Mini-AT Link software, an interface cable and the Level 1 Access
Code. After the computer is connected and Level 1 Access has been gained, the operator can perform field
calibration checks and make adjustments if necessary. Additionally, clearing alarms, performing certain
diagnostic functions and changing the configuration of authorized items are possible. To insure data integrity, the
serial communications protocol incorporates data error checking.
Access at the fourth level is reserved for the instrument technician and is referred to as Level 2 Access
Mode. Access to this level requires an IBM compatible computer, Mini-AT Link software, an interface
cable and the Level 2 Access Code. After the computer is connected and Level 2 Access is gained, the
instrument technician can reconfigure Mini-AT parameters. Any and all item code values may be
changed, including Level 1, Level 2 and the Instrument Access Codes. The Authorization Table may
also be modified, which will control what item values may be changed during Level 1 Access. To insure
data integrity, the serial communications protocol incorporates data error checking.
Note: Level 1 and Level 2 Access are computer software functions only. Even after gaining Level 1 or
Level 2 Access, changes to the instrument's configuration are not possible until a valid Instrument Access
Code is entered. After a serial link is obtained, Audit Trail, Event Log and Alarm Log downloads are
also possible.
The Mini-AT continues to recognize meter input pulses while in the Meter Read, Level-1, and Level-2 Modes.
Upon exiting any serial link access, the Mini-AT will perform a Full Wake-up just before returning to the
Corrector Mode. Following a meter reader access, the instrument will return to the Corrector Mode;
a) without a wake-up, if there were no meter rotations during the
meter reader access.
b) after an intermediate wake-up with any number of meter rotations
and N greater than one.
c) after a full wake-up with any number of meter rotations and N
equal to one.

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Receiving the Mini-AT
When the instrument is delivered, be sure that all parts are received in good condition. Check the packing
list to make certain the shipment is complete. Report any shortage or shipping damages to your Mercury
Representative. Immediately file any damage claims with the carrier who delivered the shipment.
Function Check
Open the case door and check for any loose parts and verify that all connectors are properly seated. The
main battery pack is packaged separately and must be installed on the inside of the case door. Mount
the main battery pack and plug in the battery cable connector at either J7 or J8. The memory back-up
battery should already be mounted near the center right-side of the main board (see figure 9 on page 28). Plug
in the memory battery cable connector at J26. At this time, the Mini-AT should be displaying digits on the LCD
(probably all zeros) and the unit is ready for functional checks.
Note:
All of the function checks assumes that the instrument is configured with default parameters. The
default configuration has assigned a commonly-used Meter Reader List, Pressure, Temperature and
Volume Units, Alarm Limits, etc. If the Meter Reader List or instrument configuration is something
other than the default, most checks can still be performed, but the results may vary slightly.
Pressure Function Check - Gauge Pressure Transducer
Use a mag wand to scroll through the Meter Reader List and stop at the live pressure display. With no
pressure connected, the LCD will display a value very close to zero, typically within plus or minus 0.2%
of full scale. To check the pressure measuring system, apply some amount of pressure (but less than the
full range of the transducer) and observe as the LCD value increases. There is a 10 minute time-out before
the instrument automatically reverts back to the Corrector Mode. Use the mag wand and scroll through
the remaining items until the instrument returns to the Corrector Mode.
Pressure Function Check - Absolute Pressure Transducer
Use a mag wand to scroll through the Meter Reader List and stop at the live pressure display. With no
pressure connected, the LCD will display a value very close to the local atmospheric pressure - typically
within plus or minus 0.2% of full scale. To check the pressure measuring system, apply some amount
of pressure (but less than the full range of the transducer) and observe as the LCD value increases. There
is a 10
minute time-out before the instrument automatically reverts back to the Corrector Mode. Use the
mag wand and scroll through the remaining items until the instrument returns to the Corrector Mode.
Temperature Function
Use a mag wand to scroll through the Meter Reader List and stop at the live temperature display. The
LCD will display a value very close to ambient temperature - typically within plus or minus 0.5 degrees
F. To check the temperature measuring system, grab the temperature probe near its tip and observe as
the LCD value increase. There is a 10 minute time-out before the instrument automatically reverts back
to the Corrector Mode. Use the mag wand and scroll through the remaining items until the instrument
returns to the Corrector Mode.

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Mini-AT User Guide
Volume Function Check
While in the Corrector Mode, note the corrected volume reading on the LCD. Rotate the index input wriggler
in one direction for ten (10) revolutions. Verify that the volume has increased by an expected amount. With zero
applied pressure and at room temperature, the additional corrected volume should be essentially equal to the
meter index rate, times the number of turns (10) of the wriggler. Note: the scaling of corrected volume (item 090)
may make it necessary to apply more than ten revolution to see an increase at the LCD.