1. Manuals
  2. Brands
  3. Varec Manuals
  4. Other
  5. 2920
  6. Installation and operation manual

Varec 2920 Installation And Operation Manual

Float & tape transmitter
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
IOM118GVAE4318
2920 Float & Tape Transmitter
Precision instrument for remote monitoring of
tank level and temperature information
Automation Solutions for oil & gas, defense, and aviation applications

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 2920 and is the answer not in the manual?

Questions and answers

Summary of Contents for Varec 2920

  • Page 1 IOM118GVAE4318 2920 Float & Tape Transmitter Precision instrument for remote monitoring of tank level and temperature information Automation Solutions for oil & gas, defense, and aviation applications...
  • 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 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.
  • Page 4 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.
  • Page 5 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.
  • Page 6 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.

  • Page 7: Table Of Contents

    Becoming Familiar with the 2920 FTT ........
  • Page 8 2920 EIA-485 MODBUS Hardware Setup ........
  • Page 9 Replacing the AC Power Supply Fuse ........132 Using ViewRTU to Troubleshoot the 2920 FTT ......133 Returning the 2920 FTT to Factory Default Settings .
  • Page 10 14 Ordering Information ........145 Order Code Table .

  • Page 11: Introduction

    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.

  • Page 12: Function & System Design

    Junction Box Star Communcations e.g. Mark/Space or Bi-Phase Mark 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.

  • Page 13: Internal System Design

    1 Introduction 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.

  • Page 14: Product Label

    2920 Float & Tape Transmitter 1 Introduction Product Label The figure below contains the 2920 FTT product labels. Order Code: N2920ACbccdefg0i 2920 Float & Tape Transmitter Model No. Serial No. Mfg. Date 20-65 V 0.2 A 40-65/120/220-240 V~ 500mW 50/60Hz...
  • Page 15 1 Introduction Order Code: N2920FCbccdefg1i 2920 Float & Tape Transmitter Model No. Serial No. 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)
  • Page 16 2920 Float & Tape Transmitter 1 Introduction Installation and Operations Manual...

  • Page 17: Installation

    (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”.

  • Page 18: General Safety Guidelines

    Right - Dimensions for -40°C (AC, FC) 2920 FTT 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: •...

  • Page 19: Becoming Familiar With The 2920 Ftt

    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.

  • Page 20: Water And Dust Ingress Protection

    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.

  • Page 21: Correct Sealing Of The Junction Box Covers

    The 2920 float and tape transmitter housing has been designed and tested for NEMA 4 & IP66. However, the covers must be correctly installed and tightened to maintain the seal. Note that the junction box o-ring must be properly seated around the small boss.

  • Page 22: Installation Overview

    2920 Float & Tape Transmitter 2 Installation Installation Overview To install the transmitter, follow the steps shown in the following flowchart: Preparation (Chapter 2) Mounting (Chapter3) Wiring (Chapter 4) Initial Configuration Initial Configuration Initial Configuration Initial Configuration Bi-Phase Mark (BPM)

  • Page 23: Mounting

    Mount the complete transmitter on a non-Varec gauge (see “Mounting on Alternate Gaugeheads”). • Mount standalone on a 2" pipe for gauging applications where the 2920 FTT functions as a tank side integrator for HART level instrumentation (i.e., radar) as well as spot temperature or HART average temperature.
  • Page 24 Make sure that the top of the 2920 FTT housing (marked with “TOP”) lines up with the top of the back cover. Position the circular gasket with the four bolt holes between the trans- mitter and back cover.

  • Page 25: Mounting On Alternate Gaugeheads

    Make sure that the top of the 2920 FTT housing (marked with “TOP”) lines up with the top of the mounting plate. 5. Position the mounting plate and transmitter so that the drive pin on the gaugehead sprocket passes through the slotted drive coupling on the transmitter drive shaft.

  • Page 26: Pipe Mount Option

    2920 mounted on a S & J Gauge. Pipe Mount Option The 2920 FTT can be used standalone without a mechanical gauge for radar applications as a tank side integrator. It can talk to HART radars and temperature devices. In this situation, it will mount on a 2" pipe as shown.

  • Page 27: Wiring

    "Mounting". Overview The wiring of the junction boxes to the 2920 FTT varies based on the order options. The 2920 FTT will be configured with additional junction boxes depending on the ordered options. The maximum number and arrangement of junction boxes is shown in the following figure.

  • Page 28: Safety Guidelines

    The specification, quality, and condition of the cable between the 2920 FTT and the control room is critical to the reliability of the entire system. Before wiring the 2920 FTT(s) to your system, ensure that the field wiring meets the following criteria: •...

  • Page 29: Terminating System Wiring At The Transmitter

    Attention! Utiliser des fils d'alimentation qui conviennent a une temperature de 105°C au-dessus de la temperature ambiante. Junction Box Terminals All wiring from the 2920 FTT is terminated at one or more junction boxes connected to the transmitter housing. Digital Display and Main Junction Box The digital display and main junction box provides 18 terminals using pluggable terminal connectors and includes two earth ground terminals.

  • Page 30: Communications Wiring

    2920 Float & Tape Transmitter 4 Wiring Terminal / Function Terminal Assignment Description TB1 — DC Power & Positive Terminal - DC Power All Boards Communications Bi-Phase Mark Communications Bi-Phase Mark Interface (Interchangeable - No polarity) - TX1/ - RX (B)

  • Page 31: Rtd Wiring

    RTD Wiring To use a 4-wire RTD with the 2920 FTT, connect one of the 2 parallel leads to RTD A and leave the other lead disconnected, as shown in the following figure. 3 Wire RTD...

  • Page 32: Discrete Inputs

    The standard 2920 FTT uses 20-65 V DC power, supplied through the main communications board. With an optional AC power PCB, the 2920 FTT can also be supplied with 40-65 VAC, 100- 120 VAC, or 220 - 240 VAC at 50/60 Hz.

  • Page 33: Analog Input

    4 Wiring Analog Input The Analog Input power drawings are shown below. +24V A+24V A+24V ACOM ACOM External Power Internal Power (2920 Provides Loop Power) Varec, Inc.

  • Page 34: Analog Output

    2920 Float & Tape Transmitter 4 Wiring Analog Output The Analog Output power drawings below apply to either the AO1 or AO2 terminals. External +24VDC Load A/D AO + AO - External +24VDC AO + AO - Load A/D External Power...

  • Page 35: Expansion Junction Box

    Switch 6 (SW6) on the Communications Board sets the 2920 FTT HART bus to Active (A) or Passive (P). • With SW6 set to A, the 2920 will supply voltage to the HART bus. This is the default. • With SW6 set to P, a HART slave device with an active output will supply voltage to the HART bus.

  • Page 36: I.s. Hart Junction Box

    Note An Ex d HART/Non-I.S. HART option is available on models without the I.S. HART option on the L & H terminals in the main junction box. Wiring Diagrams Following are the wiring diagrams for each variant of the 2920. These diagrams are categorized by order codes. Installation and Operations Manual...

  • Page 37: Explosion Proof And I.s. Hart

    Explosion Proof and I.S. HART Varec optionally provides an Intrinsically Safe (I.S.) HART I/O to be used with I.S. field devices, such as radars and temperature transmitters. I.S. HART models have a separate I.S. junction box for field terminations. Models that do not have I.S. HART have explosion-proof HART I/O denoted as HART+ and HART- on TB5 on the main terminal board with the display (as shown on the left below).

  • Page 38: Product Order Code: N2920-Aa-1-Cc-0-N-1-G-H-I

    2920 Float & Tape Transmitter 4 Wiring Product Order Code: N2920-aa-1-cc-0-N-1-g-h-i The following terminals apply to a 2920 FTT with DC power, 2 digital inputs, and optional analog input/analog outputs. Other product options can be variable as shown in the table below.

  • Page 39: Product Order Code: N2920-Aa-1-Cc-0-N-2-G-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-0-N-2-g-h-i The following terminals apply to a 2920 FTT with DC power, no limit switches, 4 digital inputs, and optional analog input/analog outputs. Other product options can be variable as shown in the table below.

  • Page 40: Product Order Code: N2920-Aa-1-Cc-1-E-1-G-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-1-e-1-g-h-i The following terminals apply to a 2920 FTT with DC power, 2 limit switches, 2 digital inputs, and optional analog input. Other product options can be variable as shown in the table below. N2920...

  • Page 41: Product Order Code: N2920-Aa-1-Cc-1-E-1-G-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-1-e-1-g-h-i The following terminals apply to a 2920 FTT with DC power, 2 limit switches, 2 digital inputs, and optional analog input/analog outputs. Other product options can be variable as shown in the table below.

  • Page 42: Product Order Code: N2920-Aa-1-Cc-1-E-2-G-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-1-e-2-g-h-i The following terminals apply to a 2920 FTT with DC power, 2 limit switches, 4 digital inputs, and optional analog input/analog outputs. Other product options can be variable as shown in the table below.

  • Page 43: Product Order Code: N2920-Aa-1-Cc-2-E-1-N-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-2-e-1-N-h-i The following terminals apply to a 2920 FTT with DC power, 4 limit switches, 2 digital inputs, and no analog inputs or analog outputs. Other product options can be variable as shown in the table below.

  • Page 44: Product Order Code: N2920-Aa-1-Cc-2-E-1-G-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-2-e-1-g-h-i The following terminals apply to a 2920 FTT with DC power, 4 limit switches, 2 digital inputs, and optional analog input/analog outputs. Other product options can be variable as shown in the table below.

  • Page 45: Product Order Code: N2920-Aa-1-Cc-2-E-2-G-H-I

    4 Wiring Product Order Code: N2920-aa-1-cc-2-e-2-g-h-i The following terminals apply to a 2920 FTT with DC power, 4 limit switches, 4 digital inputs, and optional analog input/analog outputs. Other product options can be variable as shown in the table below.

  • Page 46: Product Order Code: N2920-Aa-2-Cc-0-N-1-G-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-0-N-1-g-h-i The following terminals apply to a 2920 FTT with AC power, no limit switches, 2 digital inputs and an optional analog input. Other product option can be variable as shown in the table below.

  • Page 47: Product Order Code: N2920-Aa-2-Cc-0-N-1-B-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-0-N-1-B-h-i The following terminals apply to a 2920 FTT with AC power, no limit switches, 2 digital inputs, and analog outputs. Other product options can be variable as shown in the table below. N2920 Terminal Board Abbreviation Legend:...

  • Page 48: Product Order Code: N2920-Aa-2-Cc-0-N-F-G-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-0-N-f-g-h-i The following terminals apply to a 2920 FTT with AC power, no limit switches, 2 or 4 digital inputs, and optional analog input/analog outputs. Other product options can be variable as If two digital inputs are selected, then the only analog input/output shown in the table below.

  • Page 49: Product Order Code: N2920-Aa-2-Cc-1-E-1-N-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-1-e-1-N-h-i The following terminals apply to a 2920 FTT with AC power, 2 limit switches, 2 digital inputs, and no analog inputs or outputs. Other product options can be variable as shown in the table below.

  • Page 50: Product Order Code: N2920-Aa-2-Cc-1-E-1-A-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-1-e-1-A-h-i The following terminals apply to a 2920 FTT with AC power, 2 limit switches, 2 digital inputs, and one analog input. Other product options can be variable as shown in the table below. N2920...

  • Page 51: Product Order Code: N2920-Aa-2-Cc-1-E-F-G-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-1-e-f-g-h-i The following terminals apply to a 2920 FTT with AC power, 2 limit switches, 2 or 4 digital inputs, and optional analog input/analog outputs. Other product options can be variable as If two digital inputs are selected, then the analog input/output shown in the table below.

  • Page 52: Product Order Code: N2920-Aa-2-Cc-2-E-1-N-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-2-e-1-N-h-i The following terminals apply to a 2920 FTT with AC power, 4 limit switches, 2 digital inputs, and no analog inputs or outputs. Other product options can be variable as shown in the table below.

  • Page 53: Product Order Code: N2920-Aa-2-Cc-2-E-F-G-H-I

    4 Wiring Product Order Code: N2920-aa-2-cc-2-e-f-g-h-i The following terminals apply to a 2920 FTT with AC power, 4 limit switches, 2 or 4 digital inputs, and optional analog input/analog outputs. Other product options can be variable as If two digital inputs are selected, then the analog input/output shown in the table below.

  • Page 54: Connecting Wiring In The Transmitter

    4 Wiring Connecting Wiring in the Transmitter All standard electronics for the 2920 FTT are contained on the main communications circuit board. This includes 20-65 VDC power, field communications, 3-wire temperature input, and two discrete inputs. An optional secondary circuit board contains an AC power supply with three voltage ranges, two additional discrete inputs, and four discrete outputs.

  • Page 55: Connector Assignments: Communications Circuit Board

    Bi-Phase Mark Communication Option - TX/ - RX (B) EIA-485 MODBUS Space Mark/Space TankWay Computer (RXD) J15 – AC Power & Digital I/O Board Connection to Optional AC Power & Digital I/O Board J14 – Mini USB Varec Use Only Varec, Inc.
  • Page 56 2920 Float & Tape Transmitter 4 Wiring Connector / Function Terminal Assignment Description J17 – Alarms (Discrete Inputs) Common All Transmitters Alarm 1 Common Alarm 2 J6 – Serial Connection (RS-232) Receive Data (RXD) All Transmitters Transmit Data (TXD) RS-232 Gnd J18 –...

  • Page 57: Connector And Switch Locations: Ac Power Supply Circuit Board

    Output 1 110VAC NO/NC Jumper 110/220 High or Low for Output 2 AC Voltage 40-65 Discrete Outputs Varec, Inc. 1 - 4 Assembly 012836 Rev 071204 +48V NO/NC Jumper Serial No for Output 3 NO/NC Jumper for Output 4 Discrete Inputs 1 &...

  • Page 58: Selecting The Ac Voltage Setting

    Note Switches SW1 and SW2 on the AC Power circuit board determine the AC voltage setting for the 2920 FTT. See below for instructions on setting the AC Power level. Note Each optional discrete output is set to NO or NC using a jumper setting. See below for instructions on setting optional outputs as NC or NO using the appropriate jumper.

  • Page 59: Setting Optional Outputs As Nc Or No

    Under normal operating conditions, the Normally Closed (NC2) and Common (COM1) terminals of the limit switch are connected. The Normally Open (NO3) and Common (COM1) terminals of the limit switch become connected as the switch arm rides up the cam, as shown in the following figure. Varec, Inc.
  • Page 60 2920 Float & Tape Transmitter 4 Wiring NORMALLY CLOSED (NC2) FIELD ADJUSTMENT KNOB CONNECTOR NORMALLY OPEN (NO3) CONNECTOR ALARM OFF (UNUSED) COMMON (COM) CONNECTOR ADJUSTABLE ALARM DWELL TIME LIMIT SWITCH ALARM ON • When the limit switch arm rides up on the cam, it makes contact between the Normally Open (NO3) and Common (COM1), but it also breaks the connection between the Normally Closed (NC2) and Common (COM1).

  • Page 61: Display And Configuration Interface

    2920 FTT. A hot work permit is not required when configuring the Transmitter. The display provides a system of menus that navigates you through the set up process. The digital display is shown in the following figure.
  • Page 62 2920 Float & Tape Transmitter 5 Display and Configuration Interface The right status indicators display input and output status, and an indicator that shows the unit is functioning normally. The top indicator displays digital input status, as a single hexadecimal digit, 0 to F. Bit 0 indicates digital input 1.

  • Page 63: Configuration

    Description System Data Lists the software specifications of the system. Allows configuration of how the 2920 FTT presents data, such as data scroll rate or how the zero is displayed, and so on. Basic Setup Contains basic configuration parameters, such as baud rate, level and temperature display units, and so on.

  • Page 64: System Data

    For instance, if you have no radar gauges, the FMR point is not used. System Data The System Data is used to configure how the 2920 FTT user interface presents system data. System Data menu presents 4 options: •...
  • Page 65 The Reset Command allows reset of the transmitter through the user interface. A soft reset restarts the application. A hard reset resets all configuration data to default values. Note Be careful not to perform a hard reset inadver- tently. Varec, Inc.

  • Page 66: Pin Codes

    2920 Float & Tape Transmitter 5 Display and Configuration Interface Config Params Description The Tag contains 7 bytes of data to identify the transmitter. The format of the TAG is “LT xxx” where xxx is the transmitter address. Decimal Sep.
  • Page 67 8. With the Return arrow highlighted, press E two times. A message is shown "Editing enabled" to indicate that the PIN has been accepted and you can edit any configuration settings. Note After about 10 minutes of no key presses, the 2920 forces you to re-enter the PIN before allowing access. User PIN The User PIN is set in the System Data menu.

  • Page 68: Basic Setup

    2920 Float & Tape Transmitter 5 Display and Configuration Interface 3. Press E one time to access the Commands menu and Enter Admin PIN option opens. 4. Enter the Admin PIN. 5. Scroll down to User PIN. 6. Press E to open User PIN.
  • Page 69 The Encoder Type applies to both the L&J encoder and the Mark/Space encoders. The L&J encoders support the following: • 2000 (Forward Encoding - Varec gauges • 2000 (Reverse Encoding - Shand & Jurs gauges • 1000/1500 Type 3 (Reverse Encoding - Shand & Jurs gauges) •...
  • Page 70 Calibration Level is used to set (calibrate) the encoder level. Note If you enter a decimal value, the 2920 interprets the measurement as a decimal value and applies the Level Display Units to format the level. If you enter a string of numbers separated by a dash (xx - xx - xx), the 2920 applies the format of feet-inches-sixteenths.

  • Page 71: Local Rs-232

    All Params Lists all Display and Config Params in a list. Local RS-232 The RS-232 menu is used to configure the communications between the 2920 FTT and the local interface (ViewRTU). The RS-232 menu presents 3 options: • Display Only — displays the current reading, such as with a level or temperature, or current setting such as feet or degrees Fahrenheit •...

  • Page 72: System Time

    2920 Float & Tape Transmitter 5 Display and Configuration Interface Display Only Description Comm Status Online or offline for active communications. State Current Communication state, this value is dependent on the type of communications protocol used by the port. Current communications command which is protocol dependant.

  • Page 73: Encoder Data

    Display Only — data display, such as level, or field voltage • Commands — commands that can be executed from the Encoder Data menu • All Params — scrolls through the Display, Commands, and Config parameters in one menu Varec, Inc.
  • Page 74 2920 Float & Tape Transmitter 5 Display and Configuration Interface To Access Encoder Data: 1. Press Enter to access the Main Menu. The System Menu point is automatically highlighted. Main Menu Encoder Data Encoder Data RTD Data Display Only Tank Data...

  • Page 75: Rtd Data

    The RTD (Resistive Temperature Detector) Data point displays the data associated with the temperature measurement circuit on the 2920. The RTD point processes temperature using SI units, so the temperature is always displayed in degrees Celsius within the RTD data. RTD Data menu presents 4 options: •...
  • Page 76 2920 Float & Tape Transmitter 5 Display and Configuration Interface Display Only Description Temp Measured temperature in degrees. Raw Value Un-calibrated resistance measurement value. Resistance Calibrated Resistance measure value. The Value used to calculate the actual temperature parameter. Value1 Parameters used in ratio metric resistance measurement.

  • Page 77: Tank Data

    Display Only — data display, such as level or temperature • Config Params — parameters that are used to configure data in Tank data, such as critical low temperature or advise low level • All Params — scrolls through the Display and Config parameters in one menu Varec, Inc.
  • Page 78 2920 Float & Tape Transmitter 5 Display and Configuration Interface To Access Tank Data: 1. Press Enter to access the Main Menu. The System Menu point is automatically highlighted. Main Menu Tank Data Digital Outputs Display Only Analog Inputs Config Params All Params 2.
  • Page 79 AdvLowLevel This value indicates the point at which the Low Alarm Level should be activated. When the incoming value falls below this point the alarm is activated and de-activated when the value is above this point. Varec, Inc.
  • Page 80 2920 Float & Tape Transmitter 5 Display and Configuration Interface AdvHighLevel This value indicates the point at which the High Alarm Level should be activated. When the incoming value rises above this point the alarm is activated and de- activated when the value is below this point.

  • Page 81: Digital Outputs

    0x0001: Activate Relay 1 (When set for HOST Control) 0x0002: Activate Relay 2 (When set for HOST Control) 0x0004: Activate Relay 3 (When set for HOST Control) 0x0008: Activate Relay 4 (When set for HOST Control) Varec, Inc.
  • Page 82 2920 Float & Tape Transmitter 5 Display and Configuration Interface Config Params DOPwrUpState This parameter is used to force a Relay to be active at startup. 0x0001: If Controlled at Startup, Relay 1 will be set to Active 0x0002: If Controlled at Startup, Relay 2 will be set to...

  • Page 83: Analog Input

    3. Press Enter and the Analog Input menu opens. 4. To select one of the options, press Minus to move the highlight to the option you want and then press Enter. Refer to the table below for more information on each Analog Input option. Varec, Inc.
  • Page 84 2920 Float & Tape Transmitter 5 Display and Configuration Interface Display Only Description Analog Status A value of 1 indicates the analog value is valid and within range; a value of 0 indicates some the value is out of range.

  • Page 85: Analog Input User Calibration

    7. Press the E to accept the 8 mA value. 8. Press the C button twice to exit to the main menu. 9. Select Analog Input from the main Menu on the 2920. 10. Select Display menu. 11. Scroll the menu to the Value parameter.

  • Page 86: Analog Out

    2920 Float & Tape Transmitter 5 Display and Configuration Interface 12. Adjust the 4-20 mA current source and verify the Value parameter updates: 4 mA = 0.0 +/- 0.01 8 mA = 25.0 +/- 0.01 12 mA = 50.0 +/- 0.01 16 mA = 75.0 +/- 0.01...
  • Page 87 Setting the Raw Value does not apply the calibration correction to the signal. Value This value is set to manually control the 4-20 mA output. Setting the Value applies the calibration correction (if available) to the output signal. Varec, Inc.

  • Page 88: Analog Output User Calibration

    2. Connect a calibrated 4-20 mA Meter to terminals AO1- & AI COM. 3. If the 24VDC Output Power supply is not turned on, turn it on using the following steps: a. Select the Basic Setup from the main Menu on the 2920. b. Scroll to the Config Params menu.
  • Page 89 3. If the 24VDC Output Power Supply is turned off (default), turn it on using the following steps: a. Select the Basic Setup from the main Menu on the 2920. b. Scroll to the Config Params menu. c. Scroll to the Control parameter.

  • Page 90: Bpm Data

    2920 Float & Tape Transmitter 5 Display and Configuration Interface 15. Enter values 0 to 100 (percent) and verify the measurement on the 4-20 mA Meter: 0.0 = 4.00 +/- 0.01 25.0 = 8.00 +/- 0.01 50.0 = 12.00 +/- 0.01 75.0 = 16.00 +/- 0.01...

  • Page 91: Modbus Data

    3. Press Enter and the MODBUS Data menu opens. 4. To select one of the options, press Minus to move the highlight to the option you want and then press Enter. Refer to the table below for more information on each MODBUS Data option. Varec, Inc.
  • Page 92 2920 Float & Tape Transmitter 5 Display and Configuration Interface Display Only Description Request Current Request Current Function Request Addr Current Data Address NumRequests Number of Requests NumComErrors Number of Requests with Errors RS485Term RS-485 Termination Elapse Time of Request...

  • Page 93: Mark/Space Data

    2. Press Minus ten times to move the highlight to Mark/Space. 3. Press Enter and the Mark/Space menu opens. 4. To select one of the options, press Minus to move the highlight to the option you want and then press Enter. Varec, Inc.
  • Page 94 2920 Float & Tape Transmitter 5 Display and Configuration Interface Refer to the table below for more information on each Mark/Space option. Display Only Description Poll Addresses Displays the current addresses being polled by a connected Host system Num Com Errors...
  • Page 95 Mark/Space message. This parameter is transmitted in the range -799.9 to 799.9 with 0.1 resolution. All Params Lists all Display, Commands, and Config Params in a list. Varec, Inc.

  • Page 96: L&J Tankway

    2920 Float & Tape Transmitter 5 Display and Configuration Interface L&J TankWay Note The L&J TankWay Data menu is used only when monitoring communications or when configuring a L&J TankWay Device. The L&J TankWay Data menu contains parameters and allows configuration of the L&J TankWay message.
  • Page 97 If the hardware test is successful, the transmitter reconnects to the L&J TankWay bus and the status displays Connected. If the hardware test fails, the transmitter remains disconnected from the bus and the status displays Isolated. Varec, Inc.
  • Page 98 2920 Float & Tape Transmitter 5 Display and Configuration Interface Config Params Response Delay The default for the L&J response delay is 2 mS. 2nd TX Address Set this Address between 1 and 127 to have the transmitter respond to a 2nd TankWay address. This Address must be different than the Unit Addr (Basic Setup) and the 3rd TX Address.

  • Page 99: Nmt Prothermo

    3. Press Enter and the NMT Prothermo menu opens. 4. To select one of the options, press Minus to move the highlight to the option you want and then press Enter. Refer to the table below for more information on each NMT Prothermo option. Varec, Inc.
  • Page 100 • Error Cmd Error The number of error if Command fails. Comm. Tries The number of times the 2920 has polled the NMT. Comm. Fails The number of time the communications from the 2920 to the NMT has failed. Elapse Time of last update.
  • Page 101 Override Open Open Circuit Error Value: When an open-circuit fault is detected on an element, this error value is returned instead of the normal measured temperature. Varec, Inc.

  • Page 102: Hart Device

    The HART Device menu contains parameters and allows configuration of HART devices connected to the 2920 FTT. When HART device is detected, the device is given an entry in this menu. Each device is shown with it's polling address shown as "N" after the device name.
  • Page 103 • Error Cmd Error The number of errors if Command fails. Comm Tries The number of times the 2920 has polled the HART Device. Comm Failures The number of time the communications from the 2920 to the HART Device has failed.

  • Page 104: Fmr Radar

    All Params Lists all Display, Commands, and Config Params in a list. FMR Radar The FMR Radar menu contains parameters and allows configuration of Varec radars that are connected to the 2920 FTT. FMR Radar menu presents 4 options: •...
  • Page 105 Univ Cmd Rev Revision of the universal command set the FMR supports. Dev Cmd Rev Revision of the device commands that the FMR supports. Softw. Version The software version of the FMR. Hardw. Version The hardware version of the FMR. Varec, Inc.
  • Page 106 • Error Cmd Error The number of error if Command fails. Comm Tries The number of times the 2920 has polled the FMR. Comm. Fails The number of time the communications from the 2920 to the FMR has failed. Pnt Status Byte value indicating status of point.

  • Page 107: Hart Master

    All Params Lists all Display, Commands, and Config Params in a list. HART Master The HART Master menu allows configuration of the 2920 FTT as a HART Master. HART Master menu presents 4 options: • Display Only — data display, such as address or HART Type •...
  • Page 108 The current reply message from Slave device. HARTType Hart Bus Configuration, as follows: • Active: 2920 provides power to HART bus • Passive: HART bus is power by external supply Num Inst. List The number of Slave devices currently being polled.
  • Page 109 HART device. Once a a device has been found, it is remembered by the 2920 FTT until a Hard Reset is performed. • Enable - This command enables Scanning on the HART Bus.

  • Page 110: Calibration

    RTDConfig Params Basic Setup Calibrate Level Shortcut You can use a shortcut to calibrate the product level for the 2920. This procedure opens the Cal Level configuration parameter in the Basic Setup menu. To use the Cal Level shortcut: 1. Press and hold the C button for 4 to 5 seconds.

  • Page 111: Bi-Phase Mark

    Configuration & Calibration — Level, Limits, and Outputs. Basic Parameters The 2920 FTT requires the setting of several Basic Parameters to enable it to operate in your particular environment. These parameters are: • Unit Addr •...
  • Page 112 12. Press Cancel to exit each menu and return to the Home display. To Set the 2920 FTT Baud Rate 1. Follow steps 1 through 5 in the 2920 FTT unit address procedure (above). 2. In the Config Params menu, select Baud Rate.
  • Page 113 6 Bi-Phase Mark To Set the 2920 FTT Gauge Type 1. Follow steps 1 through 5 in the 2920 FTT unit address procedure (above). 2. In the Config Params menu, select Gauge Type. 3. Press Enter to modify the Gauge Type parameter.
  • Page 114 2920 Float & Tape Transmitter 6 Bi-Phase Mark Installation and Operations Manual...

  • Page 115: Modbus

    "Configuration & Calibration — Level, Limits, and Outputs". Basic Parameters The 2920 FTT requires the setting of several Basic Parameters to enable it to operate in your particular environment. These parameters are: • Unit Addr •...
  • Page 116 12. Press Cancel to exit each menu and return to the Home display. To Set the Baud Rate 1. Follow steps 1 through 5 in the 2920 FTT unit address procedure (above). 2. In the Config Params menu, select Baud Rate.
  • Page 117 7 MODBUS To Set the Temp Com Units 1. Follow steps 1 through 5 in the 2920 FTT unit address procedure (above). 2. In the Config Params menu, select Temp Com Units. 3. Press Enter to modify the Temp Com Units parameter.

  • Page 118: 2920 Eia-485 Modbus Hardware Setup

    The user can terminate the network at a 2920 FTT by closing a switch to apply a 120-ohm resistor across the network line. This switch is normally set in the UNTERM position.

  • Page 119: Setting The Bias Current

    2. On the communications circuit board, set switch SW8 to the BIASED (down) position. 3. Replace the transmitter cover. Note Applying the bias current on multiple 2920 FTT transmitters could cause poor per- formance in the EIA485 communications network. Varec, Inc.
  • Page 120 2920 Float & Tape Transmitter 7 MODBUS Installation and Operations Manual...

  • Page 121: Mark/Space

    • Setting the Data Format • Setting the Temperature Offset Mode Basic Parameters The 2920 FTT requires the setting of several Basic Parameters to enable it to operate in your particular environment. These parameters are: • Unit Addr • Encoder Direction •...
  • Page 122 12. Press Cancel to exit each menu and return to the Home display. To Set the 2920 FTT Speed Mode 1. Follow steps 1 through 5 in the 2920 FTT unit address procedure (above). 2. In the Config Params menu, select Speed Mode.

  • Page 123: L&J Tankway

    • Setting Encoder Type • Setting the Data Format Basic Parameters The 2920 FTT requires the setting of several Basic Parameters to enable it to operate in your particular environment. These parameters are: • 2920 Unit Address • Gauge Type •...
  • Page 124 Note To backspace, press Minus to access the back arrow ( ). Press Enter to backspace. 9. If the 2920 Unit Address requires a two-digit number, press Enter to move to the next digit. 10. Select the second digit using Minus or Plus.
  • Page 125 5. Continue following steps 9 through 12 above to complete the Temp Display Units setup. To Set the 2920 FTT Calibration Level 1. Follow steps 1 through 5 in the 2920 FTT unit address procedure (above). 2. In the Config Params menu, select Calibration Level.
  • Page 126 2920 Float & Tape Transmitter 9 L&J TankWay Installation and Operations Manual...

  • Page 127: Configuring Hart Devices

    3. Press Minus to locate Num Inst List. The number displayed below Num Inst List is the num- ber of HART instruments connected to the 2920 FTT. The number can be between 1 and 5. A 0 (zero) indicates no HART instruments are connected.
  • Page 128 2920 Float & Tape Transmitter 10 Configuring HART Devices Verifying Communications with a Temperature Device Do the following to verify communications with a Varec or E+H multi-element temperature device: 1. Press Enter to open the Main Menu. 2. Press Minus multiple times to select the NMT Prothermo menu.

  • Page 129: Displaying Hart Data On The Lcd

    LCD when connected to a temperature device. You can set the 2920 FTT to display other HART data (Varec or E+H Radar data, multi-element temperature data, or generic HART data) on the secondary display of the LCD. Also, you can set up to 4 data items to scroll at intervals of up to 10 seconds.
  • Page 130 3. Press Minus 2 times to the Config Params. 4. Press Enter to open the Config Params menu. 5. Press Minus to the Sec. display 1. If the 2920 FTT has not been changed from the default, the Sec. display 1 shows TANK Temp.

  • Page 131: Configuration & Calibration - Level, Limits, And Outputs

    This procedure assumes that the transmitter has been mounted to the gaugehead back cover and wired. Note The 2920 FTT utilizes a capacitive encoder that maintains the correct level reading during and after a power outage, without a battery backup. No additional configuration is required after a power outage.

  • Page 132: Calibrating Limit Switches

    Caution! Excessively loosening the set screw will cause the coupling to fall. Loose the set screw only to the extent required to free the encoder. 3. Rotate the 2920 FTT encoder shaft until the level reading to activate the switch is displayed on the display or at the local host.
  • Page 133 6. Twist the adjustable cams relative to each other to adjust the length of the dwell (the dura- tion of the alarm). Note Care should be taken to avoid having too much dwell that will cause the low alarm to sound at the high levels and vice versa. Varec, Inc.

  • Page 134: Configuring Outputs

    11. Replace the transmitter cover. Configuring Outputs To configure outputs for the 2920 FTT use the local display interface or the user must connect a laptop computer running the ViewRTU software to the RS-232 port. Then use ViewRTU to define alarm conditions and to assign a condition to each output. For the Bi-Phase Mark 2920 FTT, the outputs can also be configured through the Bi-Phase Mark interface by writing data items using the appropriate commands.
  • Page 135 Start the ViewRTU application. The user is prompted to select a firmware version file as shown in the following figure. 3. Select the file that matches the communications protocol used by the 2920 FTT, and then click OK. The main screen appears, as shown in the following figure.
  • Page 136 2920 Float & Tape Transmitter 11 Configuration & Calibration — Level, Limits, and Outputs 4. Using the icons or the Point menu, select the TANK point. The TANK dialog box appears, showing data items that can be modified in the following figure.
  • Page 137 10. To make a relay active at system startup, set the appropriate register in the DOPwrUpState parameter. 11. Click the Exit button. 12. Close ViewRTU. 13. Disconnect the laptop computer cable from the RS-232 connector. 14. Replace the 2920 FTT cover. Varec, Inc.
  • Page 138 2920 Float & Tape Transmitter 11 Configuration & Calibration — Level, Limits, and Outputs Installation and Operations Manual...

  • Page 139: Maintenance And Troubleshooting

    Checking the CPU Status The 2920 FTT provides a CPU status LED (D4) on the communications circuit board. The user can visually check this LED to ensure that processor is operating properly. Warning! Obtain a hot permit before removing the transmitter cover with power applied.

  • Page 140: 2920 Ftt Exploded View

    2920 Float & Tape Transmitter 12 Maintenance and Troubleshooting LED D4 Reset SW2 RESET RS-232 2920 FTT Exploded View Installation and Operations Manual...

  • Page 141: 2920 Ftt Spare Parts List

    12 Maintenance and Troubleshooting 2920 FTT Spare Parts List Reference the 2920 FTT Exploded View graphic to matching images with the numbers in the table below. Draw # Spare Part # Description N2920EAxxxxxxxxx 2920 FTT Electronics Assembly 08-013204 Main Terminal Board Assembly...

  • Page 142: Troubleshooting

    This section provides instructions for: • “Replacing the AC Power Supply Fuse” • “Using ViewRTU to Troubleshoot the 2920 FTT” • “Returning the 2920 FTT to Factory Default Settings” • “Resetting the 2920 FTT” • “Using the Display to Check the Transmitter Level” •...

  • Page 143: Using Viewrtu To Troubleshoot The 2920 Ftt

    12 Maintenance and Troubleshooting Using ViewRTU to Troubleshoot the 2920 FTT For diagnostics and troubleshooting of the 2920 FTT, a laptop computer running the ViewRTU software can be connected to the RS-232 port. The user can then use ViewRTU to run diagnostics or perform other troubleshooting procedures on the transmitter.

  • Page 144: Returning The 2920 Ftt To Factory Default Settings

    Returning the 2920 FTT to Factory Default Settings Note This procedure resets all level and temperature alarm setpoints. The 2920 FTT can be reset to factory default setting in using either of the procedures below: This procedure initializes all 2920 FTT configuration parameters to factory default settings, using the display interface.

  • Page 145: Resetting The 2920 Ftt

    Resetting the 2920 FTT The software reset, when executed, does not change any of the values previously set in the 2920 FTT, but has the effect of stopping all processes and restarting them, similar to a computer reboot. To perform a soft reset: 1.

  • Page 146: Using The Display To Check The Transmitter Level

    This setting does not change the units that are communicated to the host system. Verifying Temperature Data - Checking RTD Resistance To verify the accuracy of the 2920 FTT temperature data, you can determine if the RTD probe resistance is correct for the tank temperature.

  • Page 147: Random Key Presses When Replacing The Display Cover

    Random Key Presses when Replacing the Display Cover When replacing the display cover with power applied to the 2920, you may see what appears to be random key presses. This is due to the touch keys recalibrating when the cover is replaced.
  • Page 148 2920 Float & Tape Transmitter 12 Maintenance and Troubleshooting Installation and Operations Manual...

  • Page 149: Specifications

    N2920AT: -4°F to 185°F (-20°C to +85°C) N2920FC: -40°F to 185°F (-40°C to +85°C) N2920FM (Div.): -13°F to 185°F (-25°C to +85°C) N2920FM (Zones): -4°F to 185°F (-20°C to +85°C) Operating Humidity 0 to 95% relative humidity, non-condensing Varec, Inc.
  • Page 150 2920 Float & Tape Transmitter 13 Specifications Item Description Safety Approvals Models without I.S. HART: ATEX & IECEx -(Low Temp.) [N2920ACbccdefg0i] Ex db IIB T5 Gb, -40°C ≤ Ta ≤ +85°C, IP66 ATEX & IECEx - (Std. Temp.) [N2920ATbccdefg0i] Ex db IIB T5 Gb, -20°C ≤ Ta ≤ +85°C, IP66 Factory Mutual (cFMus) - (Low Temp.

  • Page 151: Entity Parameters

    40 - 65 / 100 - 120 / 220 - 240 VAC 750 mW nominal, 50/60 Hz Available Ranges Feet: 0 - 120 ft Meters: 0 - 36 m Note Limit switch ranges up to 100 feet. Primary Components Component Description Main Processor Board Bi-Phase Mark or EIA-485 MODBUS Varec, Inc.

  • Page 152: Switches And Indicators

    2920 Float & Tape Transmitter 13 Specifications Switches and Indicators Item Description Graphical Liquid Crystal Display Four-button capacitive user interface Reset Switch Sends reset signal to processor Status Indicators 4 LEDs Limit Switches 2 or 4 SPDT limit switches (optional): •...

  • Page 153: Digital Output Relay Ratings

    I.S. HART Interface IS (Intrinsically Safe) HART Master for measuring device Source Voltage U = 24 V (Typical) Total Imax Startup currents not to exceed 27 mA max Connectable Sensors Typically 4 max, depending on current consumption (including startup current) Varec, Inc.

  • Page 154: Explosion-Proof/Flameproof (Ex D) Hart Interface (Non-I.s.)

    2920 Float & Tape Transmitter 13 Specifications Warning! Do not substitute electrical components. Substitution may impair intrinsic safety and cause a hazardous condition. Note Refer to Control Drawing 28-013355, Appendix D. Explosion-proof/Flameproof (Ex d) HART Interface (Non-I.S.) Ex d HART...

  • Page 155: Ordering Information

    Class I, Division 1, Groups C&D, T5, -25°C ≤ Ta ≤ +85 °C , Type 4 Class I, Zone 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 (CAN) Electronics Assembly (No housing) Varec, Inc.
  • Page 156 2920 Float & Tape Transmitter 14 Ordering Information N2920 Power Input Communication MS Mark/Space MB EIA-485 MODBUS/GSI Type MODBUS TankWay (L&J) Bi-Phase Mark Limit Switches None 2 SPDT Limit Switches (18° adjustable dwell, positive activation) 4 SPDT Limit Switches (18° adjustable dwell, positive activation)
  • Page 157 Transmitters are supplied with 1-3 junction boxes dependent on the terminal and wiring requirements. Select the appropriate Display Option depending on the tank gauge used with the 2920 transmitter. Use this option for Electronic Assemblies without housings. (Approvals order code = EA) All communication options come with Ex d HART unless "I.S.
  • Page 158 2920 Float & Tape Transmitter 14 Ordering Information Installation and Operations Manual...

  • Page 159: Modbusappendix A - Modbus Implementation

    “Basic Setup” on page 58. This address may range from 1 to 254 and must be unique. Each 2920 FTT only responds when a query has been sent to its unique address by the host.

  • Page 160: Functions And Data Formats

    Note Default communications settings are shown in bold type above. Functions and Data Formats The MODBUS data in the 2920 FTT is arranged in integer registers, floating point registers, and status bits. The assignments for these registers are found at the end of this appendix.

  • Page 161: Integer Registers

    These same registers may be written one at a time with function code 06 or multiple registers can be written with function code 16. For future compatibility, the 2920 FTT accepts reads and writes to reserved registers. Writes to reserved registers have no effect. Reads from reserved registers will return undocumented values.

  • Page 162: Integer Data

    2920 Float & Tape Transmitter MODBUSAppendix A — MODBUS Implementation Note In all of the following communication examples, the error check value is depen- dent upon the function code and message content. Integer data The integer data is a whole number between 0 and the maximum MODBUS integer (inclusive).

  • Page 163: Coded Data

    The bits within the packed registers are grouped by data or function type. The following communication example of packed bits shows alarm status information at data address 5 (0005 Hex) returned by the 2920 FTT.

  • Page 164: Floating-Point Registers

    FTT that are not easily scaled (such as the scaling factors themselves). Floating-point Data The 2920 FTT is capable of using a two 16-bit registers format and a one 32-bit register format. Examples and descriptions of both formats follow. Note Although this type of data does not require scaling, it is important that the mea- surement unit selected in the 2920 FTT be the same as that expected by the host.
  • Page 165 MODBUSAppendix A — MODBUS Implementation Host Request Address Function Start Reg Start Reg # of Reg # of Reg Error Code Check AD C5 2920 FTT Response Address Function # of Reg # of Reg Data Data Data Data LSB Error Code Check...

  • Page 166: Status Bits

    5 or multiple bits may be written with function code 15. An example of a read message for bits 2 through 6 as returned by the 2920 FTT is shows as follows.

  • Page 167: Data Out Of Range

    It does not affect the operation of the 2920 FTT. The 2920 FTT supports only diagnostic code 00. This is a request to return query data. Upon receiving a loopback message containing this code, the 2920 FTT will echo the message sent by the host.

  • Page 168: Hardware Implementation

    The 2920 FTT 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 2920 FTT and MODBUS master share a twisted pair of wires to communicate.
  • Page 169 Scaled Crit Low Temp Setpoint (MODBUS > CritLowTemp) Scaled Adv Low Temp Setpoint (MODBUS > AdvLowTemp) Scaled Adv High Temp Setpoint (MODBUS > AdvHighTemp) Scaled Crit High Temp Setpoint (MODBUS > CritHighTemp) Scaled Temp Deadband (MODBUS > TDeadband) Varec, Inc.
  • Page 170 2920 Float & Tape Transmitter MODBUSAppendix A — MODBUS Implementation Register Number Type Description Coded Level Units (Setup > Lev Disp Units) 45 - METERS 44 - FEET 47 - INCHES 241 - FT-IN-16THS 240 - 16th of an INCH...
  • Page 171 AO1 Scale (Analog Output #1 > Scale) Float AO2 Offset (Analog Output #2 > Offset) Float AO2 Scale (Analog Output #2 > Scale) 162 – 199 Reserved Float Level (Tank Data > Level) Float Temp (Tank Data > Temp) Float RTD Resist Varec, Inc.
  • Page 172 2920 Float & Tape Transmitter MODBUSAppendix A — MODBUS Implementation Register Number Type Description Reserved Reserved Integer AlmStat (Bit Field) (Tank Data > AlmStat) Integer DiagStat (Bit Field) (Tank Data > DiagStat) 212 - 214 Reserved Reserved Coded Level Units (Local Display)
  • Page 173 2 - Output #3 Power-up State 3 - Output #4 Power-up State 4 - Output #1 Controlled at Power-up 5 - Output #2 Controlled at Power-up 6 - Output #3 Controlled at Power-up 7 - Output #4 Controlled at Power-up Varec, Inc.
  • Page 174 2920 Float & Tape Transmitter MODBUSAppendix A — MODBUS Implementation Register Number Type Description Bit Field DO State (Digital Outputs > DOState) 0 - Output #1 1 - Output #2 2 - Output #3 3 - Output #4 273 - 284...
  • Page 175 Temp4 (NMT Prothermo > Elem#05) 3044 Float Temp5 (NMT Prothermo > Elem#06) 3046 Float Temp6 (NMT Prothermo > Elem#07) 3048 Float Temp7 (NMT Prothermo > Elem#08) 3050 Float Temp8 (NMT Prothermo > Elem#09) 3052 Float Temp9 (NMT Pr))othermo > Elem#10 Varec, Inc.

  • Page 176: 32-Bit Floating Point Register Map

    2920 Float & Tape Transmitter MODBUSAppendix A — MODBUS Implementation Register Number Type Description 3054 Float Temp10 (NMT Prothermo > Elem#11) 3056 Float Temp11 (NMT Prothermo > Elem#12) 3058 Float Temp12 (NMT Prothermo > Elem#13) 3060 Float Temp13 (NMT Prothermo > Elem#14)

  • Page 177: Status Bit Register Map

    DO Output Control 96 - 111 DO Output Power-up State 112 - 127 DO State 128- 143 DO1 Assign 144 - 159 DO2 Assign 160 - 175 DO3 Assign 176 - 191 DO4 Assign 192 - 207 DO1 Output Duration Varec, Inc.
  • Page 178 2920 Float & Tape Transmitter MODBUSAppendix A — MODBUS Implementation Installation and Operations Manual...

  • Page 179: Appendix B - Rtd Resistance - Temperature Charts

    This appendix describes the relationship between temperature and resistance for the three RTD types that can be used with the 2920 FTT. This information can be used to verify the accuracy of the RTD probe used with the 2920 FTT.
  • Page 180 2920 Float & Tape Transmitter Appendix B — RTD Resistance - Temperature Charts Pt100 RTD Resistance Temp °C Temp °F 52.11 -120.0 -184.0 53.74 -116.0 -176.8 55.38 -112.0 -169.6 -108.0 -162.4 58.63 -104.0 -155.2 60.25 -100.0 -148.0 61.87 -96.0 -140.8 63.49...
  • Page 181 148.0 298.4 158.06 152.0 305.6 159.55 156.0 312.8 161.04 160.0 320.0 162.53 164.0 327.2 164.02 168.0 334.4 165.5 172.0 341.6 166.98 176.0 348.8 168.46 180.0 356.0 169.94 184.0 363.2 171.42 188.0 370.4 172.9 192.0 377.6 174.37 196.0 384.8 Varec, Inc.

  • Page 182: Cu100 Rtd Resistance Vs. Temperature

    2920 Float & Tape Transmitter Appendix B — RTD Resistance - Temperature Charts Pt100 RTD Resistance Temp °C Temp °F 175.84 200.0 392.0 177.31 204.0 399.2 Cu100 RTD Resistance vs. Temperature Cu100 RTD Resistance Temp °C Temp °F 12.78 -204.0 -335.2...
  • Page 183 28.0 82.4 102.67 32.0 89.6 104.19 36.0 96.8 105.72 40.0 104.0 107.24 44.0 111.2 108.76 48.0 118.4 110.29 52.0 125.6 111.81 56.0 132.8 113.33 60.0 140.0 114.86 64.0 147.2 116.38 68.0 154.4 117.9 72.0 161.6 119.43 76.0 168.8 Varec, Inc.

  • Page 184: Cu90 Rtd Resistance Vs. Temperature

    2920 Float & Tape Transmitter Appendix B — RTD Resistance - Temperature Charts Cu100 RTD Resistance Temp °C Temp °F 120.95 80.0 176.0 122.48 84.0 183.2 88.0 190.4 125.52 92.0 197.6 127.05 96.0 204.8 128.57 100.0 212.0 130.09 104.0 219.2 131.62...
  • Page 185 12.0 53.6 96.70 16.0 60.8 98.25 20.0 68.0 99.80 24.0 75.2 101.34 28.0 82.4 102.89 32.0 89.6 104.44 36.0 96.8 105.99 40.0 104.0 107.54 44.0 111.2 109.09 48.0 118.4 110.64 52.0 125.6 112.19 56.0 132.8 113.74 60.0 140.0 Varec, Inc.
  • Page 186 2920 Float & Tape Transmitter Appendix B — RTD Resistance - Temperature Charts Cu90 RTD Resistance Temp °C Temp °F 115.29 64.0 147.2 116.84 68.0 154.4 118.39 72.0 161.6 119.93 76.0 168.8 121.48 80.0 176.0 123.03 84.0 183.2 124.58 88.0 190.4...

  • Page 187: Appendix C - Bi-Phase Mark Implementation

    Appendix C — Bi-Phase Mark Implementation Appendix C — Bi-Phase Mark Implementation This protocol chapter explains the operation of the Bi-Phase Mark as it pertains to the 2920 Float & Tape Transmitter. Implementation The implementation of the Bi-Phase Mark (BPM) protocol on the 2920 supports a variety of commands represented by a TOR (Type of Request) and some of them further by an item.
  • Page 188 2920 Float & Tape Transmitter Appendix C — Bi-Phase Mark Implementation Item Description Low Alarm The low alarm level is triggered with the level falls below the LA, the relevant level status bit is set. This bit remains set until the level is again above the low level alarm setting.

  • Page 189: Appendix D - Associated Intrinsically Safe Control Drawing

    Appendix D — Associated Intrinsically Safe Control Drawing Appendix D — Associated Intrinsically Safe Control Drawing The drawing on the following page depicts the 2920 Float and Tape Transmitter with HART Associated Intrinsic Safety. Varec, Inc.
  • Page 190 2920 Float & Tape Transmitter Appendix D — Associated Intrinsically Safe Control Drawing Installation and Operations Manual...
  • Page 191 HART master communications board connector locations AC power board I.S. HART Junction Box communications board indicator specifications contact outputs input power CPU status input/output specifications Cu100 RTD resistance-temperature chart installation Cu90 RTD resistance-temperature chart safety guidelines data, temperature, verifying Varec, Inc.
  • Page 192 Pt100 RTD resistance-temperature chart wiring communications protocols 134, 135 limit switches resetting the 2920 FTT resetting the 2920 FTT, troubleshooting safety guidelines resistance line terminating at transmitter returning to default settings wiring diagrams wiring RTD data...
  • Page 194 © 2018 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 herein may be the trademarks of their respective owners.

Table of Contents

Save PDF