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Varec Network Adapter 4000 Installation And Operation Manual

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4000 Tank Gauge Transmitter
Advanced Technology Transmitter for transmission of level and
temperature data from the tankside to inventory management
systems
Installation and
Operations Manual
www.varec.com
Varec, Inc.
5834 Peachtree Corners East, Norcross (Atlanta), GA 30092 USA
Tel: +1 (770) 447-9202 Fax: +1 (770) 662-8939
IOM003GVAE0809

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  • Page 1 Advanced Technology Transmitter for transmission of level and temperature data from the tankside to inventory management systems Installation and Operations Manual 5834 Peachtree Corners East, Norcross (Atlanta), GA 30092 USA www.varec.com Varec, Inc. Tel: +1 (770) 447-9202 Fax: +1 (770) 662-8939 IOM003GVAE0809...
  • Page 3 Phone: (770) 447-9202 Fax: (770) 662-8939 Trademarks acknowledged Varec, Inc. recognizes all other trademarks. Trademarks of other products mentioned in this document are held by the companies producing them. FuelsManager®, TankView®, TacFuels®, Varec®, and FuelsManager IntoPlane® are registered trademarks of Varec, Inc.

  • Page 4: Disclaimer Of Warranties

    The 4000 Advanced Technology Transmitter (ATT) has not been tested by Varec under all possible operational conditions, and Varec may not have all the data relative to your application. The information in this instruction manual is not all inclusive and does not and cannot take into account all unique situations.

  • Page 5: Safety Precaution Definitions

    Read this manual carefully and make sure you understand its contents before using this product. Follow all instructions and safety guidelines presented in this manual when using this product. If the user does not follow these instructions properly, Varec cannot guarantee the safety of the system.
  • Page 6 Advanced Technology Transmitter Installation and Operations Manual...

  • Page 7: Table Of Contents

    4000 Introduction ..........1 Using This Manual .
  • Page 8 3.5.5 Imperial Fractional 1800 Series Transmitter Quick Setup 3.5.6 Imperial Decimal 1800 Series Transmitter Quick Setup 3.5.7 0-20 Meters 1800 Series Transmitter Quick Setup 3.5.8 0-30 Meters 1800 Series Transmitter Quick Setup 3.5.9 Imperial Modbus Quick Setup Defaults 3.5.10 Metric Modbus Quick Setup Defaults Maintenance and Troubleshooting Maintenance .
  • Page 9 7.11 Modbus Support over Mark/Space Host Interface ....43 7.12 Compatibility with Varec Tank Polling Unit ......43 ATT Family of Products Model 4040 Display Unit .
  • Page 10 Tank Gauge Transmitter 10.2 4000GEFMO ..........63 10.3 4000LJFMO .

  • Page 11: Introduction

    Liquid level measurement is provided by the Advanced Technology Transmitter coupled to a Varec Model 2500 or other level gauge, as shown in Figure 1-1.

  • Page 12: Operation

    Mark/Space. Configuration The Varec Model 1200 Handheld Terminal is used to configure the ATT. It connects to the same ATTI bus used to interconnect other input/output devices to the ATT. There is a special connection located inside the junction box for the Handheld Terminal.

  • Page 13: Installation

    4000 Installation Overview This section contains instructions for unpacking, mounting, grounding, and wiring the Varec Model 4000 Advanced Technology Transmitter (ATT) assembly. An installation checklist is also included. Warning! Figure 2-1: Model 4000 ATT mounted on Model 2500 ATG 2.1.1...

  • Page 14: Mounting The Equipment

    Installation Mounting the Equipment The ATT is bolted to the Model 2500 Automatic Tank Gauge head as illustrated in Figure 2-2. It may also be mounted to Endress+Hauser, Sakura, Tokyo-Keiso, Shand & Jurs, and Gauging Systems, Inc. float and tape gauges with the Endress+Hauser adapter shown in the following table.

  • Page 15: Grounding The Equipment

    4000 Grounding the Equipment Warning! An external grounding lug is provided on the ATT. A connection from the ground lug to earth ground must be made before any other wiring connections are made. Note! Note! Wiring Connections should be made in a conventional manner according to local or plant electric codes.

  • Page 16: Connecting Host Communication

    Installation Figure 2-3: ATT Field Terminal Block Wiring Terminal Block One TB1 2.4.4 Connecting Host Communication The procedure used to wire the ATT to the host computer depends on the type of host interface option ordered with the ATT. = ATTI expansion Bus + power HPORT = ATTI bus HART Signal...

  • Page 17: Att Eia485 Wiring

    4000 2.4.5 ATT EIA485 Wiring The ATT uses a 2-wire EIA485 hardware interface to communicate with the Modbus master. EIA485 is a high speed differential communications network which allows up to 32 devices to operate on one network. The ATT and Modbus master share a twisted pair of wires to communicate.
  • Page 18 Installation Field Junction Box Two 18 AWG twisted pair cables Model 4000 ATT Transmitters* Model 4000 ATT Transmitters* * Up to 31 units with 5000 ft. max. wiring distance using good quality wire. Figure 2-5: Typical EIA485 System Wiring RTU 8130 Model 8130 with optional 48 VDC power supply.

  • Page 19: Att Mark/Space Wiring

    Field Junction Box 4 Conductor Cable 18 AWG Shielded Ground shield at RTU8130 ONLY! Do NOT ground shield at transmitter. Details of RTU8130 with 8210 expansion module and ATT termination board wiring Installation External Power Supply Varec Model 4000...

  • Page 20: Connecting The Rtd

    Installation Connecting the RTD The following list shows how the ATT is wired to an RTD device. The ATT’s temperature circuit is designed to work with a platinum or copper 3-wire RTD. 2.5.1 Connecting the Handheld Terminal Figure 2-3 on page 6 shows how the 1200 Hand Held Terminal is connected to the ATTI bus on the ATT.

  • Page 21: Configuration

    4000 Configuration The Varec Model 4000 Advanced Technology Transmitter (ATT) must be configured for the specific tank, attached sensors, and host interface. This section provides detailed information on ATT configuration. The ATT can be configured with a 1200 Hand Held Terminal or from a host program such as Varec TankView.

  • Page 22: Terminal Mode Configuration

    Configuration Function Key Previous Function [ ] Table 3-1: Alpha and numeric information is entered from the keypad directly. Numeric data is entered using a single keystroke, while alpha information is entered with a two-key combination. The two-key combination for alpha data consists of a shift key followed by a numeric key to select the desired alpha character.

  • Page 23: Terminal Mode Operation

    4000 Figure 3-2: ATT Display Mode Menu Tree Figure 3-3: 1200 Hand Held Terminal Terminal Mode Operation The 1200 Hand Held Terminal is used to scroll through the various ATT menus. Basic scroll and selection operations are performed using the four function keys (F1 through F4) immediately below the display.

  • Page 24: Menu Operation

    Configuration Tank Gauge Transmitter Menu Operation For example, when the Main Menu is displayed on the top line, pressing F1 (Up) will scroll up through the possible main menu selections while pressing F2 (Down) will scroll down through the possible main menu selections. Pressing F4 (Enter) will cause the selection of the sub-menu displayed on lines two and three (such as Config Menu).

  • Page 25: Main Menu

    4000 3.4.1 Main Menu Main Menu Quick Setup Summary Menu Config Menu Host Menu Exit and Save Quit/Exit Description Initializes the ATT configuration parameters to a variety of preset configurations. Eng Frac 1900, Eng Dec 1900, 0-30 m 1900, 0-20m 1900, Eng Frac 1800, Eng Dec 1800, 0-30 m 1800, 0-20m 1800, Imperial Modbus, or Metric Modbus are valid.

  • Page 26: Summary Menu

    Configuration 3.4.2 Summary Menu Summary Menu Level Temperature RTD Resistance Cfg Error Type Power Log Bad CPU Board Stat Bad RAM Stat Bad EProm Stat Bad EEProm Stat Bad EECksum Stat Bad Comm Board Bad Level Stat Bad Temp Stat Low Battery Stat Crit Hi Level Stat Adv Hi Level Stat...

  • Page 27: Configuration Menu

    4000 3.4.3 Configuration Menu Configuration Menu Level Units Temp Units Level Sensor Calib Level2 Batt Off2 Damping Temp Sensor Manual Temperature Noise Reject Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp...

  • Page 28: Host Menu

    Configuration 3.4.4 Host Menu Host Menu Type Mark/Space Adr Low Speed Xmtr to Sim Encoder to Sim Disable Temp Reply ASU Connected Temp to Sim Offset Temp By 100 Low Battery Modbus Address Baud Parity Stop Bits Max Integer Min Level Max Level Min Temp Max Temp...

  • Page 29: Quick Setup

    4000 Only displayed if host interface type is Mark/Space Only displayed if host interface type is Modbus Only displayed if host interface type is Modbus or Mark/Space Only displayed if there is no temperature sensor Quick Setup The Quick Setup option is meant to get the ATT configured quickly and with some defaults.

  • Page 30: Imperial Fractional 1900 Quick Setup Defaults

    Configuration 3.5.1 Imperial Fractional 1900 Quick Setup Defaults General Configuration Level Units Temp Units Level Sensor Damping Temp Sensor Manual Temperature Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp Temp Deadband...

  • Page 31: Imperial Decimal 1900 Quick Setup Defaults

    4000 3.5.2 Imperial Decimal 1900 Quick Setup Defaults General Configuration Level Units Temp Units Level Sensor Damping Temp Sensor Manual Temperature Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp Temp Deadband...

  • Page 32: Meter 1900 Quick Setup Defaults

    Configuration 3.5.3 0-20 Meter 1900 Quick Setup Defaults General Configuration Level Units Temp Units Level Sensor Damping Temp Sensor Manual Temperature Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp Temp Deadband...

  • Page 33: Meter 1900 Quick Setup Defaults

    4000 3.5.4 0-30 Meter 1900 Quick Setup Defaults General Configuration Level Units Temp Units Level Sensor Damping Temp Sensor Manual Temperature Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp Temp Deadband...

  • Page 34: Imperial Fractional 1800 Series Transmitter Quick Setup

    Configuration 3.5.5 Imperial Fractional 1800 Series Transmitter Quick Setup The Imperial fractional 1800 quick setup selection establishes the same default parameters as the Imperial Fractional 1900 quick setup with the exception that the sensor to emulate parameter is the 1800 MWT. 3.5.6 Imperial Decimal 1800 Series Transmitter Quick Setup The Imperial decimal 1800 quick setup selection establishes the same default...

  • Page 35: Imperial Modbus Quick Setup Defaults

    4000 3.5.9 Imperial Modbus Quick Setup Defaults General Configuration Level Units Temp Units Level Sensor Damping Temp Sensor Manual Temperature Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp Temp Deadband...

  • Page 36: 3.5.10 Metric Modbus Quick Setup Defaults

    Configuration 3.5.10 Metric Modbus Quick Setup Defaults General Configuration Level Units Temp Units Level Sensor Damping Temp Sensor Manual Temperature Critical High Level Advisory High Level Advisory Low Level Critical Low Level Level Deadband Critical High Temp Advisory High Temp Advisory Low Temp Critical Low Temp Temp Deadband...

  • Page 37: Maintenance And Troubleshooting

    4000 Maintenance and Troubleshooting Maintenance The Varec Model 4000 Advanced Technology Transmitter (ATT) is designed and manufactured to provide accurate and reliable operation without a requirement for regularly scheduled maintenance. Due to the modular construction of the ATT, necessary repairs can be quickly and safely accomplished.

  • Page 38: Troubleshooting

    Maintenance and Troubleshooting Troubleshooting The ATT has provisions for hardware alarm inputs, software generated setpoint alarms, and other alarm conditions. Alarm and error status conditions are available to the Model 1200, to the host Computer, and to the optional ATT display. When in the Model 1200 display mode, the Diagnostic Status Menu displays only active alarm and error status conditions.

  • Page 39: Att Status Conditions

    4000 ATT Status Conditions The ATT provides the following general status condition. Status Condition FIELD CONFIG MODIFIED ATT Configuration Error Checking The ATT performs extensive integrity checking on the configuration data before it uses it for calculations. If a configuration error is detected, the ATT will generate a CONFIG ERROR status.

  • Page 40: Model 1200 Error Messages

    Maintenance and Troubleshooting Model 1200 Error Messages The following error messages can be encountered while using the Model 1200. Error Message INVALID ANSWER INVALID FLOAT INVALID INPUT INVALID NUMBER NEGATIVE NUMBER NOT ALTERABLE NOT IN ALTER MODE TOO MANY CHARACTERS NUMBER TOO LARGE Host Communication Loopback Tests Communications between a host computer and several field devices, such as the ATT,...

  • Page 41: Specifications

    4000 Specifications Specifications and Physical Characteristics The following specifications apply to the Varec Model 4000 Advanced Technology Transmitter assembly over the operating temperature range. 5.1.1 Environmental Item Temperature Humidity Transient Lightning Vibration Shock 5.1.2 Physical Item Housing Bolts Paint Dimensions...

  • Page 42: Level Measurement

    Specifications 5.1.4 Level Measurement Item Resolution Counter Level Range Count Verification Level Data Type Calibration Level Units of Measure Direction of Rotation Rotational Speed Gear Ratio Communications Check Count Error Status Battery Low Status Battery Operation Battery Shelf Life Tank Gauge Transmitter Description 0.04 in (1.0 mm) +/-128 ft (39 M)

  • Page 43: Safety Agency Approvals

    4000 Safety Agency Approvals 5.2.1 Explosion Proof The HART Level Encoder is ETL listed to the following standards for explosion proof installations: Agency Acronym (FM) (CSA) 5.2.2 Intrinsic Safety The ATT is not an intrinsically safe device and must not be opened or wired while power is applied.

  • Page 44: Major System Assemblies And Components

    Specifications Tank Gauge Transmitter Major System Assemblies and Components The major assemblies and components for the Model 4000 are identified in Table 5-1 and Table 5-2 and illustrated in Figure 5-1. Figure 5-1: ATT Major Assemblies Installation and Operations Manual...
  • Page 45 4000 Item Table 5-1: Part Number 13-05956-102 13-05956-202 Table 5-2: Note! Assembly/Component Sensor Assembly CPU Board Assembly with EPROM x – depending on communications 3 Volt Batteries, quantity 2 Terminal Board Assembly GPE Terminal Board Mark/Space Communications Module EIA-485 Communications Module Matrix Communications Module Whessoe Bus/GPE Communications TIWAY Communications Module...
  • Page 46 Specifications Tank Gauge Transmitter Installation and Operations Manual...

  • Page 47: Ordering Information

    4000 Ordering Information Order Codes N4000 - Communications GPE Loop Communication Mark Space Matrix (1600/1700) TIWAY Communication Whessoe Bus/GPE Current Loop (1315) Mark/Space MODBUS GSI Type MODBUS Approvals CS Explosion Proof - Class I, Groups C & D (ETL tested to CSA standards) FM Explosion Proof - Class I, Groups C &...
  • Page 48 Ordering Information Tank Gauge Transmitter Installation and Operations Manual...

  • Page 49: Theory Of Operation

    4000 Theory of Operation Overview The Advanced Technology Transmitter (ATT) represents a flexible system for use in liquid level measurement and/or other measurement applications. The Advanced Technology Transmitter (ATT) collects measurement information from compatible devices and transmits this information over a field communications bus. Increment disk Shaft Input connected to Model 2500...

  • Page 50: Status Inputs And Outputs

    GPE Loop Communications • TIWAY Communications • L&J Tankway Communications • Varec Mark Space Matrix • GSI Modbus • Level Measurement The HART Level Encoder utilizes a proprietary incremental count technique for determining liquid level. Two code disks are provided in the encoder with each disk containing a number of slots.

  • Page 51: Damping

    4000 7.6.2 Damping The ATT implements a damping scheme to stabilize the level and temperature in turbulent tanks. The amount of damping is specified by a damping value in the 'DAMPING' parameter under the Config Menu. This parameter can be entered via the Model 1200 using the Alter menu.

  • Page 52: Mark/Space Host Interface

    When operating in the 1800 or 1900 emulation mode, the ATT is compatible with all existing Varec field interfaces such as the Tank Polling Unit (TSU) or RTU 8130. The ATT automatically determines if it is being polled as an 1800/1900 transmitter.

  • Page 53: Modbus Support Over Mark/Space Host Interface

    7.12 Compatibility with Varec Tank Polling Unit The Mark/Space communications provided by the ATT are compatible with the Varec Tank Polling Unit (TPU). This permits the ATT to be multi-dropped on the same Mark/ Space data highway as the Varec 1800, Varec 1900, and MFT/HIU devices.
  • Page 54 Theory of Operation Tank Gauge Transmitter Installation and Operations Manual...

  • Page 55: Att Family Of Products

    4000 ATT Family of Products The ATT product family consists of the 4000 ATT, the Model 4040 Display Unit, and the Model 4050 Digital Input/Output Unit. mounted to Float Gauge 24-65 Vdc for EIA-485 48-65 Vdc for Mark/Space 65 Vac for TIWAY 48-65 Vac for Whessoe Bus Figure 8-1: ATT Family of Products Model 4040 Display Unit...

  • Page 56: Model 4050 Digital Input/Output Unit

    ATT Family of Products Model 4050 Digital Input/Output Unit The Model 4050 is a digital I/O unit. It includes four digital contact closure outputs and four digital inputs. It operates connected to and is powered from the ATTI bus. The unit is mounted in a round explosion proof junction box.

  • Page 57: Modbus Implementation

    Introduction This protocol guide explains the operation of the Modbus protocol as described in the following Modicon document: PI-MBUS-300 Rev B (1985) implemented in the Varec Model 4000 Advanced Technology Transmitter (ATT). Implementation The implementation of the Modbus protocol for the ATT provides a standard form of digital communications.
  • Page 58 Modbus Implementation Function Code Table 9-1: Note! Configuration Item Modbus Address Maximum Integer Size Integer Scaling Factors Number of Stop Bits Table 9-2: Function Information Type Read Bits Read Bits Read Integer, Code, Status word, Floating point Read Integer, Code, Status word, Floating point Write Bits...

  • Page 59: Functions And Data Formats

    4000 Functions and Data Formats The Modbus data in the ATT is arranged in integer registers, floating point registers, and status bits. The assignments for these registers are found at the end of this appendix. Function codes 03, 04, 06, and 16 are used with integer registers. Because of the multiple Modbus hosts available today, the ATT supports two floating- point data formats: a two 16-bit register format and a one 32-bit register format.

  • Page 60: Integer Data

    Modbus Implementation Term Status Bit (L) Error Check Note! 9.5.1 Integer Data The integer data is a whole number between 0 and the maximum Modbus integer (inclusive). The maximum Modbus integer is a user-configurable variable that is a whole number between 0 and 65,535 (inclusive). The integer data must also be scaled for each data type by entering the desired units, a minimum, and a maximum value.

  • Page 61: Integer Data

    4000 9.5.2 Integer Data Hexadecimal representation • 4124Decimal equivalent: 16,676 • The data returned for data address 56 is 16,676 (4124 Hex). This value must be scaled using the following formula to give it meaning. If a variable goes out-of-bounds (outside the minimum or maximum scale points), a value equal to the maximum Modbus integer + 1 is returned.

  • Page 62: Coded Data

    Modbus Implementation 9.5.4 Coded Data Coded data represents a table look-up value. Data written to these registers must be a valid table entry. Invalid data may cause a Configuration Error to occur. The following example shows coded data at data address 20 (0014 Hex) representing level units. The value 2 (0002 Hex) returned from the ATT corresponds to level units = FT-IN-16TH.

  • Page 63: Floating-Point Registers

    4000 Floating-Point Registers Although not part of the Modbus protocol specification, floating point numbers have been implemented using the IEEE 754 standard. Floating point numbers reduce the complexity required in scaling integer values and provide a means to transmit numbers used by the ATT that are not easily scaled (such as the scaling factors themselves).

  • Page 64: The One 32-Bit Register Format

    Modbus Implementation 9.6.4 The One 32-bit Register Format Function code 65 (41 Hex) is used to read floating-point registers in this format. An example of a floating-point register read is shown below with the a temperature of 100.0 degrees is being read from register 1 (0001 Hex). Host Request Address ATT Response...

  • Page 65: Status Bits

    4000 Status Bits In the ATT implementation, status bits contain alarms, commands, and status information. The state of a Modbus status bit is defined as either ON (true) or OFF (false). The ON state is represented by a "1". The status bits may be read with function code 1 or 2.

  • Page 66: Data Out Of Range

    Modbus Implementation Data Out of Range When integer data calculated by the ATT is outside the minimum or maximum scale points or is otherwise out of range, the value returned is that of the maximum Modbus integer + 1. For example, if the maximum Modbus integer is 65,534 (as used in our previous examples) the "data out of range"...

  • Page 67: Integer Register Map

    4000 Termination resistors of 120 Ohms are shown at each end of the communication bus to minimize reflections on the line. Termination resistors may not be necessary at baud rates of 9600 bits per second or slower. Pull-up and pull-down resistors are also shown at the Modbus master end of the cable.
  • Page 68 Modbus Implementation Register Number Type Bit Field CmdsBit Usage 0 CANCEL ALT 1 CLR LOCAL MODS 2 RESTART 3 SAVE TO EE 4 RESERVED 5 CALIB LEVEL 6 ENC BATT OFF 7 QUICK SETUP 8.15 RESERVED Reserved Code A/D Noise Reject: Type 0 - 60Hz 1 - 50 Hz Scaled...
  • Page 69 4000 Register Number 144 – 199 Type Code Quick Setup Option 0 - NONE 1 - ENG FRAC 1800 2 - ENG DEC 1800 3 - 0 TO 20 M 1800 4 - 0 TO 30M 1800 5 - ENG FRAC 1900 6 - ENG DEC 1900 7 - 0 TO 20 M 1900 8 - 0 TO 30M 1900...
  • Page 70 Modbus Implementation Register Number Type Bit Field AlmStat Bit Field DiagStat Reserved Reserved Reserved Reserved Code Level Units Code Temp Units Reserved Reserved Reserved Reserved Code Level Type Code Temp Type Reserved Reserved Reserved Reserved Code Damping Value Code A/D Noise Reject: Type Reserved Reserved Reserved...

  • Page 71: 9.13 Floating Point Register Map

    4000 9.13 Floating Point Register Map 9.14 Status Bit Register Map Register Number Level RTD Resist Reserved Adv Low Level Crit High Level Crit Low Temp Adv High Temp Temp Deadband Max Level Max Temp Man Temp Register Number 0..15 32..47 Diag Stat Modbus Implementation...
  • Page 72 Modbus Implementation Tank Gauge Transmitter Installation and Operations Manual...

  • Page 73: 10 Optional Interfaces

    10.4 4000MXFMO This option can co-exist along side VAREC style matrix transmitters. As implied, a transmitter is selected actively by either the 48-volt or the common line in the matrix. When selected, the transmitter sends the level data over the Mark Space data lines 3 milliseconds later.

  • Page 74: 10.5 4000Wbfmo

    Optional Interfaces 10.5 4000WBFMO This option can co-exist along side Whessoe Bus™ transmitters, the signal format is a current loop style transmission signal. The transmitter address is user-selectable between 1 and 127 with basic baud rates, stop, and parity bits. The protocol is referred to as Whessmatic 550, which was widely used by the UK for their Intelligent Tank gauging systems.

  • Page 75: Glossary

    Advisory Alarms Process alarms intended to act as caution indicators providing users advanced warnings of unusual situations. Varec Model 4000 Advanced Technology Transmitter. ATTI Bus Unpowered, non-intrinsically safe, HART compatible communication bus used on ATT. Baud Rate A communications measure of serial data transmission rate typically in bits per second.
  • Page 76 Celsius. A unit of measure for temperature readings. 0 C is the boiling point of water. DBAND Deadband. ft-in-16 Feet-inches-1/16 of an inch. Imperial fractional measurement. Fahrenheit. A unit of measure for temperature readings. 0 F is the freezing point of water, 212 Host A tank data acquisition system responsible for collecting and processing information from a number of subordinate devices.
  • Page 77 Temperature Deadband. The band that a temperature alarm must clear before the alarm is reset. Temp Temperature. Tank Polling Unit. A Varec interface unit that allows a host computer to interface to Varec Mark/Space, Remote Selector, IFU, and Matrix field interfaces.
  • Page 78 Tank Gauge Transmitter Installation and Operations Manual...
  • Page 79 4000 NOTES...
  • Page 80 Tel: +1 (770) 447-9202 Fax: +1 (770) 662-8939 © 2004 Varec, Inc. All Rights Reserved. This document is for information purposes only. Varec, Inc. makes no warranties, express or implied, in this summary. The names of actual companies and products mentioned herien may be the trademarks of their respective owners.

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