Varec 2920 User manual

IOM118GVAE4318
Automation Solutions for oil & gas, defense, and aviation applications
Installation and Operations Manual
Dispatch and Fuels Accounting
2920 Float & Tape Transmitter
Precision instrument for remote monitoring of
tank level and temperature information

Varec, Inc. iii
Copyright
© 2018, All rights reserved. Printed in the United States of America.
Except as permitted under the United States Copyright Act of 1976, no part of this publication
may be reproduced, stored in a retrieval system or transmitted in any form or by any means -
electronic, mechanical, photocopying, recording, or otherwise - without the prior written
permission of the Publisher:
Varec, Inc.
5834 Peachtree Corners East
Peachtree Corners (Atlanta), Georgia 30092
Phone: [phone]
Fax: [phone]
Trademarks Acknowledged
Varec, Inc. recognizes all other trademarks. Trademarks of other products mentioned in this
manual are held by the companies producing them.
FuelsManager®, TankView®, and, Varec® are registered trademarks of Varec, Inc.
All other product and service names mentioned are the trademarks of their respective
companies.
Documentation Control
This document and the information provided within are controlled by the approvals agency(s)
listed below. All changes to this document must be submitted to and approved by the agency(s)
before public release.
• FM Approvals (FM)
• ATEX
• IECEx
FCC (US)
This device complies with Part 18 of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause
undesired operation.
Note This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 18 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. Any modifications made to this device that are not approved by
Varec, Inc. may void the users authority to operate this equipment.

ICES-003 Class A Notice
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada
Disclaimer of Warranties
The contract between the Seller and the Buyer states the entire obligation of the Seller. The
contents of this instruction manual shall not become part of or modify any prior or existing
agreement, commitment, or relationship between the Seller and Buyer. There are no express or
implied warranties set out in this instruction manual. The only warranties that apply are those
in the existing contract between the Seller and Buyer.
The 2920 Float & Tape Transmitter (FTT) 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. Consequently, the user should review this product literature in
view of his or her application. If you have any further questions, please contact Varec for
assistance.
Limitations of Seller's Liability
In the event that a court holds that this instruction manual created some new warranties, Seller's
liability shall be limited to repair or replacement under the standard warranty clause. In no case
shall the Seller's liability exceed that stated as Limitations of Remedy in the contract between
the Seller and Buyer.
Use of parts that are not manufactured or supplied by Varec voids any warranty and relieves
Varec of any obligation to service the product under warranty. Varec recommends the use of
only Varec manufactured or supplied parts to maintain or service Varec 2920 Float & Tape
Transmitters.
iv Installation and Operations Manual

Terms of Use
The information provided in this document is provided "as is" without warranty of any kind.
Varec, Inc. disclaim all warranties, either express or implied, including the warranties of
merchantability and fitness for a particular purpose. In no event shall Varec, Inc. or its suppliers
be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss
of business profits or special damages, even if Varec, Inc. or its suppliers have been advised of
the possibility of such damages.
This manual is solely intended to describe product installation and functions and should not be
used for any other purpose. It is subject to change without prior notice. This manual was
prepared with the highest degree of care. However, should you find any errors or have any
questions, contact one of our service offices or your local sales agent.
Safety Precaution Definitions
Caution! Damage to equipment may result if this precaution is disregarded.
Warning! Direct injury to personnel or damage to equipment which can cause injury to
personnel may result if this precaution is not followed.
Note Qualified personnel are required for installation of this product in a hazardous
environment.
Safety Precautions
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.
Note Comply with all applicable regulations, codes, and standards. For safety precautions,
the user should refer to the appropriate industry or military standards.
Caution! Electrical Hazard! Read and understand static and lightning electrical protection
and grounding described in API 2003. Make certain that the tank installation, operation,
and maintenance conforms with the practice set forth therein.
Warning! Striking the gaugehead of the transmitter with a metal object could cause a
spark to occur. When removing or replacing the gaugehead in flammable or hazardous
liquid storage areas, take necessary measures to protect the gaugehead from impact.
Warning! Volatile fumes may be present! Ensure that the tank has been leak and pressure
tested as appropriate for the liquid to be stored. Observe appropriate safety precautions in
flammable or hazardous liquid storage areas. Do not enter a tank that has contained
hydrocarbons, vapors, or toxic materials, until a gas-free environment is certified. Carry
breathing equipment when entering a tank where oxygen may be displaced by carbon
dioxide, nitrogen, or other gases. Wear safety glasses as appropriate. Use a hard hat.
Warning! Sparks or static charge could cause fire or explosion! The mechanical
connections between the guide cables, the float, the tape, and the gaugehead provide a
resistance to ground that is adequate for the safe electrical drain of electrostatic charges
that may accumulate in the tank and the product. Worker activity and worker clothing may
accumulate electrostatic charges on the body of a worker. Care should be used in
flammable environments to avoid the hazard.
Varec, Inc. v

vi Installation and Operations Manual
Warning! Broken negator motor spring pieces can cause injury when the back cover of the
gaugehead is removed! Whenever the back cover is removed, stand to one side as the last
bolt is removed.
Warning! Discard plastic conduit entry plugs. Use the metal plugs that are shipped loose
in a bag.
Warning! Explosion and water ingress hazard. Tighten cover and tighten and seal conduit
and plugs with pipe sealant prior to operation. Failure to do so voids manufacturer’s
warranty.
Warning! Possible buildup of electrostatic charges on non-conducting surfaces. To clean,
wipe equipment with a damp cloth.
Caution! Consult the manufacturer if dimensional information on the flameproof joints is
necessary.
Warning! The flamepath joints are not repairable by the end user. Consult the factory for
repair or replacement.
Warning! Conduit seal required within 50 mm of conduit entries to enclosure when
installed.
Attention! Joint de conduit requis à moins de 50 mm aux entrées de conduit à la clôture
une fois installé.
Warning! Install models with I.S. HART per Associated Intrinsically Safe (AIS) (Appareillage
Connexe) Control Drawing 28-013355, Appendix D.
Warning! Improper connections, component substitutions, or tampering may impair
intrinsic safety and create a hazardous condition.
Avertissement! La subsitution de composants peut compromettre la sècuritè intrinséque.
Warning! Do not open the display or expansion junction boxes while energized due to an
explosion hazard.
Note The I.S. HART terminal box is labeled with a light blue sticker. It is intrinsically safe
and may be opened while energized.

Varec, Inc. vii
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Function & System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
System Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Internal System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Product Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Site Preparation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
General Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Becoming Familiar with the 2920 FTT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Grounding the Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Water and Dust Ingress Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Correct Sealing of the Junction Box Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Installation Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Mounting on a Varec Gaugehead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Mounting on Alternate Gaugeheads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pipe Mount Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Checking Line Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Terminating System Wiring at the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Junction Box Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Communications Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
RTD Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Discrete Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Expansion Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
HART Master Active/Passive Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
I.S. HART Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Explosion Proof and I.S. HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Product Order Code: N2920-aa-1-cc-0-N-1-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Product Order Code: N2920-aa-1-cc-0-N-2-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Product Order Code: N2920-aa-1-cc-1-e-1-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Product Order Code: N2920-aa-1-cc-1-e-1-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Product Order Code: N2920-aa-1-cc-1-e-2-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Product Order Code: N2920-aa-1-cc-2-e-1-N-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Product Order Code: N2920-aa-1-cc-2-e-1-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

viii Installation and Operations Manual
Product Order Code: N2920-aa-1-cc-2-e-2-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Product Order Code: N2920-aa-2-cc-0-N-1-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Product Order Code: N2920-aa-2-cc-0-N-1-B-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Product Order Code: N2920-aa-2-cc-0-N-f-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Product Order Code: N2920-aa-2-cc-1-e-1-N-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Product Order Code: N2920-aa-2-cc-1-e-1-A-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Product Order Code: N2920-aa-2-cc-1-e-f-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Product Order Code: N2920-aa-2-cc-2-e-1-N-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Product Order Code: N2920-aa-2-cc-2-e-f-g-h-i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Connecting Wiring in the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Connector Locations: Communications Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . 44
Connector Assignments: Communications Circuit Board . . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Connector and Switch Locations: AC Power Supply Circuit Board . . . . . . . . . . . . . . 47
Connector Assignments: AC Power Supply Circuit Board . . . . . . . . . . . . . . . . . . . . . 47
Selecting the AC Voltage Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Setting Optional Outputs as NC or NO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Wiring Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5 Display and Configuration Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
System Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
PIN Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Basic Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Local RS-232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
System Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Encoder Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
RTD Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Tank Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Analog Input User Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Analog Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Analog Output User Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
BPM Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
MODBUS Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Mark/Space Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
L&J TankWay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
NMT Prothermo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
HART Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
FMR Radar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
HART Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Calibrate Level Shortcut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
6 Bi-Phase Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
Basic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
7 MODBUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Basic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
2920 EIA-485 MODBUS Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Contents
Varec, Inc. ix
Terminating the MODBUS Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
Setting the Bias Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
8 Mark/Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Basic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111
9 L&J TankWay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Basic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
10 Configuring HART Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Displaying HART Data on the LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
11 Configuration & Calibration — Level, Limits, and Outputs . . . . . . . . 121
Calibrating the Transmitter Tank Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Before Beginning the Calibration Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Calibrating Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
Configuring Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
12 Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
Checking the CPU Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
2920 FTT Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
2920 FTT Spare Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
Upgrading software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
Replacing the AC Power Supply Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
Using ViewRTU to Troubleshoot the 2920 FTT . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
Returning the 2920 FTT to Factory Default Settings . . . . . . . . . . . . . . . . . . . . . . . . .134
Resetting the 2920 FTT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
Using the Display to Check the Transmitter Level . . . . . . . . . . . . . . . . . . . . . . . . . .136
Verifying Temperature Data - Checking RTD Resistance . . . . . . . . . . . . . . . . . . . . .136
Random Key Presses when Replacing the Display Cover . . . . . . . . . . . . . . . . . . . .137
13 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
Entity Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Functional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Primary Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Switches and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Input/Output Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Digital Output Relay Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
Analog 4-20 mA Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
Analog 4-20 mA Outputs (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
I.S. HART Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
Explosion-proof/Flameproof (Ex d) HART Interface (Non-I.S.) . . . . . . . . . . . . . . . . . . . . . . .144

xInstallation and Operations Manual
14 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Order Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
A MODBUSAppendix A — MODBUS Implementation . . . . . . . . . . . . . . .149
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Functions and Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Integer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Integer data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Coded data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Packed Bit Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Floating-Point Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Floating-point Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
The Two 16-bit Registers Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
The one 32-bit register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Exception Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Data Out of Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Hardware Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Integer Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
32-Bit Floating Point Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Status Bit Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
B Appendix B — RTD Resistance - Temperature Charts . . . . . . . . . . . .169
Pt100 RTD Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Cu100 RTD Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Cu90 RTD Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
C Appendix C — Bi-Phase Mark Implementation . . . . . . . . . . . . . . . . . .177
Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
D Appendix D — Associated Intrinsically Safe Control Drawing . . . . . .169

Varec, Inc. 1
Chapter 1 Introduction
Introduction
This manual provides the information needed to install, maintain, and troubleshoot the Varec
2920 Float & Tape Transmitter (FTT).
The 2920 Float & Tape Transmitter (FTT) is a precision digital instrument designed to mount
directly to most mechanical float and tape tank gauges and transmit level and other data to an
inventory management system.
The 2920 FTT is available for Bi-Phase Mark, MODBUS, L&J TankWay, or Mark/Space field
communications. It can be mounted directly to most manufacturers’ tank gauges, including
GSI, L&J, and others. The following figure shows the 2920 FTT mounted to the Varec 2500
Automatic Tank Gauge (ATG) in both front-facing and back-facing configurations.
The 2920 FTT is explosion proof and approved for use in hazardous-classified locations, making
it particularly suitable for bulk storage applications found in the oil and gas industry.

2920 Float & Tape Transmitter 1 Introduction
2Installation and Operations Manual
Function & System Design
System Functionality
1. In response to changes in liquid level, the mechanical level gauge rotates the 2920 FTT
encoder drive shaft.
2. The 2920 FTT’s precision direct drive gearing turns a high resolution encoder which detects
the angular position of the drive shaft and produces a level value.
3. If a spot temperature RTD (Resistance Temperature Detector) is used, the communications
board translates the RTD input to a digital temperature value.
4. The communications circuit board converts the encoded level and temperature to a spe-
cific field communications protocol.
5. The communications circuit board transmits the data to an interface device for display in
a control room by an inventory management system, such as FuelsManager.
FuelsManager
Software
8130 RTU
or
8300 TGI
Loop Communcations e.g. MODBUS
Star Communcations e.g. Mark/Space or Bi-Phase Mark
Field
Junction Box
+24V
+5V
+15V
-15V
CPU
COMM
I/O
ERROR
Communications
between DCS/PLCs
for control capabilities
Tank Gauge
and
Transmitter
Power
Loop
Communcations
3-wire
RTD

1 Introduction
Varec, Inc. 3
Internal System Design
The 2920 FTT is constructed with the following assemblies, as shown in the following figure:
A. Enclosure Cover
B. Communications Circuit Board
C. AC Power Circuit Board (Optional)
D. Connector Circuit Board or Optional HART IS Barrier Board
E. Encoder Assembly
F. Enclosure Base
G. Junction Box
H. Limit Switch Assembly (Optional)
All standard electronics for the 2920 FTT are contained on the communications circuit board
(B). This includes DC power, field communications, a 3-wire temperature input, and two
discrete inputs.
An optional circuit board (C) contains an AC power supply, two additional discrete inputs, and
four contact outputs. The optional limit switch assembly (H) can support up to four limit
switches. These limit switches and inputs/outputs can be used in safety applications such as
overfill protection, level switch inputs, local alarm control, permissives, and interlocks. The
limit switches and inputs/outputs can also provide basic automation control.
D
C
G
A
H
E
B
F

2920 Float & Tape Transmitter 1 Introduction
4Installation and Operations Manual
Product Label
The figure below contains the 2920 FTT product labels.
Serial No.
Model No.
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
16-02920AC Rev. A
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
1725 II 2G Ex db IIB T5 Gb -40
°C ≤ Ta ≤ +85 °C IP66
FM10ATEX0022X IECEx FMG10.0006X
!
i
IOM 118
Order Code: N2920ACbccdefg0i
Serial No.
Model No.
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
16-02920AT Rev. C
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
1725 II 2G Ex db IIB T5 Gb -20
°C ≤ Ta ≤ +85 °C IP66
FM10ATEX0022X IECEx FMG10.0006X
!
i
IOM 118
Order Code: N2920ATbccdefg0i
Order Code: N2920FCbccdefg0i
Serial No.
Model No.
16-02920FC Rev. D
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
Class I, Division 1, Groups C&D, T5, -40°C ≤ Ta ≤ +85°C, Type 4
Class I, Zone 1, IIB, T5, IP66 (USA)
Zone 1 per CEC 18-100 (CAN) FM16CA0114X
!
i
IOM 118
Serial No.
Model No.
16-02920FM Rev. D
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
!
i
IOM 118
Class I, Division 1, Groups C&D, T5, -25°C ≤ Ta ≤ +85°C, Type 4
Cl. I, Zn. 1, AEx db IIB T5 Gb, -20°C ≤ Ta ≤ +85°C, IP66 (USA)
Ex db IIB T5 Gb, -20°C ≤ Ta ≤ +85°C, IP66, FM16CA0114X (CAN)
Order Code: N2920FMbccdefg0i
Serial No.
Model No.
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
16-013391AC Rev. A
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
1725 II 2(1)G
Ex db[ia Ga] IIB T5 Gb -40
°C ≤ Ta ≤ +85 °C IP66
Refer to control drawing 28-013355 for installation requirements.
FM10ATEX0022X
IECEx FMG10.0006X
!
i
IOM 118
28-013355
Order Code: N2920ACbccdefg1i
Serial No.
Model No.
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
16-013391AT Rev. B
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
1725 II 2(1)G
Ex db[ia Ga] IIB T5 Gb -20
°C ≤ Ta ≤ +85 °C IP66
Refer to control drawing 28-013355 for installation requirements.
FM10ATEX0022X
IECEx FMG10.0006X
!
i
IOM 118
28-013355
Order Code: N2920ATbccdefg1i

1 Introduction
Varec, Inc. 5
See Installation Instruction Document (IOM118)
See Associated Intrinsically Safe Apparatus
control drawing 28-013355, Appendix D
Order Code: N2920FCbccdefg1i
Serial No.
Model No.
16-013391FC Rev. D
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
Class I, Division 1, Groups C&D, T5, -40°C ≤ Ta ≤ +85°C, Type 4
Class I, Zone 1, IIB, T5, IP66 (USA)
Zone 1 per CEC 18-100 (CAN) FM16CA0114X
Refer to control drawing 28-013355 for installation requirements.
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
!
i
IOM 118
Serial No.
Model No.
16-013391FM Rev. C
2920 Float & Tape Transmitter
Varec, Inc.
5834 Peachtree Corners East, Peachtree Corners (Atlanta), Georgia 30092 USA
Mfg. Date
Class I, Division 1, Groups C&D, T5, -25°C ≤ Ta ≤ +85°C, Type 4
Cl. I, Zn. 1, AEx db[ia Ga] IIB T5 Gb, -20°C ≤ Ta ≤ +85°C, IP66 (USA)
Ex db[ia Ga] IIB T5 Gb, -20°C ≤ Ta ≤ +85°C, IP66, FM16CA0114X (CAN)
Refer to control drawing 28-013355 for installation requirements.
20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz
!
i
IOM 118
Order Code: N2920FMbccdefg1i
i
IOM 118
28-013355

2920 Float & Tape Transmitter 1 Introduction
6Installation and Operations Manual

Varec, Inc. 7
Chapter 2
Installation
This chapter provides a pre-installation checklist, safety information, unpacking instructions,
grounding instructions, and an overview of the installation steps.
Site Preparation Checklist
Before installing the 2920 FTT transmitter on a mechanical float and tape gauge, ensure that:
1. The mechanical float gauge is operating correctly.
2. There is sufficient space around the mechanical gauge to install the transmitter and acces-
sories (such as conduit and cabling). Refer to the following figure.
3. The correct transmitter/mechanical gauge adaptor is available, if required.
4. The gaugehead shall be adequately grounded for the safe electrical drain of electrostatic
charges that may accumulate in the tank and the product (see “Grounding the Equip-
ment”).
5. The correct field connections at the gaugehead are ready to connect to the 2920 FTT (i.e.,
power, communications, and temperature sensor wiring).
6. The installation complies with all safety guidelines as described in “General Safety Guide-
lines”.
The tank can remain in-service and the mechanical float gauge can remain in place while
installing and configuring the 2920 FTT.

2920 Float & Tape Transmitter 2 Installation
8Installation and Operations Manual
General Safety Guidelines
The 2920 FTT is certified to be used in Class I, Division 1, Groups C and D, and Class I, Zone 1,
Group IIB hazardous locations.
The user should follow other local safety guidelines for additional protection. Information may
also be obtained from the following sources:
• National Electric Code (NEC)
• National Fire Protection Association (NFPA)
• Instrument Society of America (ISA)
• FM Approvals LLC (FM)
• Underwriters Laboratories Incorporated (UL)
When in doubt about the safety of an area, the user should check with the local safety
authorities. Always observe equipment labels and warning signs posted in the area.
Unpacking
Varec 2920 Float & Tape Transmitters are shipped fully assembled and ready for installation.
518.9mm
20.43in
238.5mm
9.39in
101.3mm
3.99in
259.5mm
10.22in
311.6mm
12.27in
48mm
1.89in
565.2mm
22.25in
261.6mm
10.30in
101.3mm
3.99in
282.6mm
11.13in
Center - Dimensions for standard 2920 FTT
Right - Dimensions for -40°C (AC, FC) 2920 FTT

2 Installation
Varec, Inc. 9
To Unpack the 2920 FTT:
1. Place the shipping container on a secure bench.
2. Open the shipping container, taking care not to damage the contents.
3. Carefully remove transmitter from the shipping container and place it on the bench.
4. Inspect the transmitter for shipping damage. Report any damage to the carrier.
5. Remove and discard the plastic conduit entry shipping plugs.
Note If the transmitter must be stored prior to installation, it should be repacked in its
shipping container and stored in a temperature- and humidity-controlled environment.
Becoming Familiar with the 2920 FTT
The 2920 FTT is housed within an explosion-proof enclosure. The cover is provided to permit
access to the 2920 FTT’s electronics (i.e., circuit boards). O-Ring seals are provided to prevent
moisture from entering the termination or electronics compartments.
The 2920 FTT housing provides an external grounding lug and 3/4-inch NPT conduit entries.
The conduit entries permit access to the 2920 FTT wiring connections.
Grounding the Equipment
Warning! The 2920 FTT must be grounded before communication and power connections
are made.
An external grounding lug is provided on the 2920 FTT. A connection from the ground lug to
earth ground must be made before any other wiring connections are made.
Note For proper operation of the 2920 FTT, a ground strap must be attached to the FTT.
Grounding through mounting kits or pipe coupling is not adequate.

2920 Float & Tape Transmitter 2 Installation
10 Installation and Operations Manual
Properly seal all ports to prevent moisture or other contamination from entering the wiring
compartment.
Water and Dust Ingress Protection
The enclosure and junction boxes have been designed and tested to IP66 and NEMA 4 for
water and dust ingress. To ensure that the unit is protected against water and dust ingress and
that the explosion proof/flame proof integrity of the enclosure is not compromised, ensure
the following:
1. Cover o-rings are installed, undamaged, and properly seated (see below) prior to
tightening. See the Correct Sealing of the Junction Box Covers section below for an illus-
tration and an explanation.
2. The plastic shipping conduit entry plugs are discarded and replaced by the metal,
explosion proof/flameproof plugs that were provided with the transmitter.
3. Conduit seals are installed per the local code. Varec recommends that a potting
compound be used that will not absorb water. Varec also recommends a drain on verti-
cal conduit runs with an explosion proof/flameproof flame arrestor.
4. Seal all pipe threads (e.g., conduit and plugs) with pipe sealant or Teflon tape.
5. The cover set screws are backed out enough to allow the covers to be fully tight-
ened and the covers are fully tightened. The covers may be locked, if desired, with the
set screws after the covers are tight.