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Tek-Trol Tek-LCD 7802A Instruction Manual

Nema 4x loop-powered flow rate/totalizer indicator
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Technology Solutions
T
L
EK-
CD 7802A
NEMA 4X Loop-Powered Flow Rate/Totalizer Indicator
Instruction Manual
Document Number: IM-7802A
www.tek-trol.com

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Summary of Contents for Tek-Trol Tek-LCD 7802A

  • Page 1 Technology Solutions CD 7802A NEMA 4X Loop-Powered Flow Rate/Totalizer Indicator Instruction Manual Document Number: IM-7802A www.tek-trol.com...
  • Page 2 Crystal Lake, IL 60014 Tel: +1 847 857 6076, +1 847 655 7428 © COPYRIGHT Tek-Trol LLC 2016 No part of this publication may be copied or distributed, transmitted, transcribed, stored in a retrieval system, or translated into any human or computer language, in any form or by any means, electronic, mechanical, manual, or otherwise, or disclosed to third parties without the express written permission.

  • Page 3: Table Of Contents

    Table of Contents Safety Instructions ......................... 4 Installation ............................4 Unpacking ............................4 Conduit/Stopping Plug ........................4 Product Description ........................5 Introduction ............................5 Specifications ............................. 5 Dimensional Drawing ......................... 8 Ordering Information ......................... 9 Mounting............................9 Connections ..........................10 Input Signal &...
  • Page 4 4.5.9 Square Root Linearization (SquAr) ......................32 4.5.10 Programmable Exponent Linearization (ProG.E)................32 4.5.11 Low-Flow Cutoff (CUTOFF) ........................33 4.5.12 Input Signal Filter (FILTER) ......................... 33 4.5.13 Internal Calibration (ICAL) ........................33 4.5.14 Error Message (SPAn ERROR) ......................34 4.5.15 Information (INFO) ..........................
  • Page 5 Read complete instructions prior to installation and operation of the meter. Limited Warranty Tek-Trol LLC warrants this product against defects in material or workmanship for the specified period under “Specifications” from the date of shipment from the factory. Tek-Trol’s liability under this limited warranty shall not exceed the purchase value, repair, or replacement of the defective unit.

  • Page 6: Safety Instructions

    If any part is missing or the meter malfunctions, please contact your supplier or the factory for assistance. 1.3 Conduit/Stopping Plug The Tek-LCD 7802A is provided with three ¾ NPT threaded conduit openings and one IP68 rated ¾ NPT plastic conduit plug. The conduit/stopping plug included has 1.29 wrenching flats and a screwdriver slot.

  • Page 7: Product Description

    2 Product Description 2.1 Introduction The Tek-LCD 7802A is a plastic field mounted loop-powered rate/totalizer fully featured for demanding applications in the harshest environmental conditions. The meter derives all of its power from the 4-20 mA loop. It is programmed using the four through-window buttons, without removing the cover, and can be scaled with or without a calibration signal.
  • Page 8 Environmental Operating temperature range: -40°C to 75°C (-40℉ to 167℉) Storage temperature range: -40°C to 75°C (-40℉ to 167℉)Relative humidity: 0 to 90% non-condensing Connections Screw terminals accept 12 to 22 AWG wire NEMA 4X, IP65 plastic field enclosure. Color: grey. Enclosure Three ¾...
  • Page 9 Maximum Voltage Without Backlight or with With Loop-Powered Backlight Externally-Powered (DC Drop Powered) Backlight 3.0 VDC @ 20 mA 6.0 VDC @ 20 mA 300 Ω @ 20 mA 150 Ω @ 20 mA Equivalent Resistance Externally Powered Voltage Range: Maximum Power Backlight 9-36 VDC...

  • Page 10: Dimensional Drawing

    2.3 Dimensional Drawing Enclosure Dimensions – Front View Enclosure Dimensions – Side Cross Section View...

  • Page 11: Ordering Information

    Tek-LCD 7800A-6846SS Stainless Steel Pipe Mounting Kit 2.5 Mounting The Tek-LCD 7802A has two slotted mounting flanges that may be used for pipe mounting or wall mounting. Alternatively, the unit may be supported by the conduit using the conduit holes provided.

  • Page 12: Connections

    3 Connections WARNING • Static electricity can damage sensitive components. • Observe safe handling precautions for static-sensitive components. • Use proper grounding procedures/codes. • If the meter is installed in a high voltage environment and a fault or installation error occurs, high voltage may be present on any lead or terminal.

  • Page 13: Input Signal & Backlight Connections

    Figure 1. Connector Board 3.1 Input Signal & Backlight Connections Signal and backlight connections are made to a four-terminal connector mounted in the base of the enclosure. For installations without backlight, only the two signal terminals are connected. The 4-20 mA input with no backlight has a maximum voltage drop of 3 V and is wired as shown in Figure 2.

  • Page 14: External Reset Connection

    Figure 3. Input Connections with Loop-Powered Backlight Figure 4. Input Connections with Externally-Powered Backlight It is possible to use the same transmitter (signal loop) power supply for the externally powered backlight. The backlight circuit will draw 25 mA in addition to the loop circuit. 3.2 External Reset Connection External reset connections are made to two terminals labelled Reset.

  • Page 15: Open Collector Output Connections

    Figure 6, or drive a relay as shown in Figure 7. To avoid damaging the Tek-LCD 7802A’s amplifying components, use care not to wire incorrectly or exceed output ratings. A diode, such as 1N4000 series, will provide protection from relay transients.

  • Page 16: Setup And Programming

    4.2 Through-Window Buttons The Tek-LCD 7802A is equipped with four sensors that operate as through-window buttons so that it can be programmed and operated without removing the cover. These buttons can be disabled for security by selecting the LOCK setting on the switch located on the connector board in the base of the enclosure.

  • Page 17: Buttons And Display

    4.3 Buttons and Display • Press the Menu button to enter or exit the Programming Mode at any time. • Press the Right arrow button to move to the next digit or decimal position during programming. • Press the Up-arrow button to scroll through the menus, decimal point, or to increment the value of a digit.

  • Page 18: Main Menu Display Functions & Messages

    4.4 Main Menu Display Functions & Messages The meter displays various functions and messages during setup, programming, and operation. The following table shows the main menu functions and messages in the order they appear in the menu. Display Parameter Action/Setting SETUP Setup Enter Setup menu...

  • Page 19: Main Menu

    togle Tag Toggle Toggle Tag and Total PASSWRD Password Enter the Password menu LOCKD Unlocked Program password to lock meter UNLOCKED Locked Enter password to unlock meter 99999 Flashing display Overrange condition Underrange condition -99999 SERVICE Service Select before removing/installing cover for service or to clean the window 4.4.1 Main Menu The main menu consists of the most commonly used functions: Setup, Password, and Service.

  • Page 20: Setting Numeric Values

    4.4.2 Setting Numeric Values The numeric values are set using the Right and Up arrow buttons. Press Right arrow to select next digit and Up arrow to increment digit. The digit being changed blinks. Press the Enter button, at any time, to accept a setting or Menu button to exit without saving changes.

  • Page 21: Setting The Decimal Point (Dec_Pt)

    4.4.4 Setting the Decimal Point (dEc_PT) Rate decimal point may be set with up to four decimal places or with no decimal point at all. Total decimal point may be set with up to six decimal places or with no decimal point at all. Rate decimal and total decimal are programmed individually.

  • Page 22: Programming The Meter (Prog)

    4.4.5 Programming the Meter (PRoG) It is very important to read the following information, before proceeding to program the meter: • There is no need to recalibrate the meter for milliamps when first received from the factory. • The meter is factory calibrated for milliamps prior to shipment. The calibration equipment is certified to NIST standards.

  • Page 23: Scaling The Meter (Scale)

    4.4.6 Scaling the Meter (SCALE) The 4-20 mA input can be scaled to display the process in engineering units. A signal source is not needed to scale the meter; simply program the inputs and corresponding display values. Figure 8. Scale Menu For instructions on how to program numeric values see 4.4.2 Setting Numeric Values, page 18.

  • Page 24: Calibrating The Meter (Cal)

    4.4.7 Calibrating the Meter (CAL) To scale the meter without a signal source refer to 4.4.6 Scaling the Meter (Scale), page 21. The meter can be calibrated to display the process in engineering units by applying the appropriate input signal and following the calibration procedure. The use of a calibrated signal source is strongly recommended.

  • Page 25: Setting The Time Base (Tbase)

    Minimum Input Span The minimum input span is the minimum difference between input 1 and input 2 signals required to complete the calibration or scaling of the meter. The minimum span is 0.10 mA. If the minimum span is not maintained, the meter reverts to input 2, allowing the appropriate input signals to be applied.

  • Page 26: Manual Or Automatic Total Reset Function (Trst)

    4.4.10 Manual or Automatic Total Reset Function (trST) The meter may be programmed to reset the total either manually using the Reset button or automatically. Manual reset button may be disabled to avoid inadvertent total reset. The automatic reset is based on the set point programmed in the Advanced menu: OUTPUT →...

  • Page 27: Setting The Tag Display (Tag)

    4.4.11 Setting the Tag Display (TAG) The meter can be set to display a combination of seven alphanumeric characters for engineering units (e.g. GALLONS) or for identification (e.g. TANK 3). Press Right arrow to select next unit and Up arrow to increment unit. •...

  • Page 28: Setting Up The Password (Passwrd)

    4.4.12 Setting Up the Password (PASSWRD) The Password menu is used to program a five-digit password to prevent unauthorized changes to the programmed parameter settings. The lock symbol is displayed to indicate that settings are protected. Locking the Meter Enter the Password menu and program a five-digit password. For instructions on how to program numeric values see 4.4.2 Setting Numeric Values, page 18.

  • Page 29: Service Feature (Service)

    If the correct six-digit password is entered, the meter displays the message UNLOCKD (unlocked) and the protection is disabled until a new password is programmed. If the password entered is incorrect, the meter displays the message LOCKED for about two seconds, and then it returns to Run Mode.

  • Page 30: Advanced Features Menu & Display Messages

    4.5 Advanced Features Menu & Display Messages The following table shows the Advanced features menu functions and messages in the order they appear in the menu. Display Parameter Action/Setting OUTPUT Output Enter output menu Disable output Alrm Alarm Output Enter alarm output menu RStE Rate Alarm Assign alarm output to rate...

  • Page 31: Advanced Features Menu

    4.5.1 Advanced Features Menu To simplify the setup process, functions not needed for most applications are located in the Advanced features menu. Press and hold the Menu button for five seconds to access the Advanced features menu. Press the Enter button to access any menu or press Up arrow button to scroll through choices. Press the Menu button to exit at any time.

  • Page 32: Alarm & Pulse Output (Output)

    4.5.2 Alarm & Pulse Output (OUTPUT) The Tek-LCD 7802A is equipped with an NPN open collector output that may be set up for high or low rate alarm trip point, total alarm trip point, or pulse output based on K-factor. The pulse output frequency may be programmed for 2, 4, 8, 16, 32, 64, or 128 Hz.

  • Page 33: Pulse Output K-Factor (Pulse)

    4.5.4 Pulse Output K-Factor (PulsE) The pulse output K-factor corresponds to the total units (e.g. gallons) needed to generate one pulse. For example, if the K-factor value is set to 10, one pulse is generated for every 10 counts incremented on the display. If the pulse output exceeds the programmed output frequency, pulses are accumulated as pending.

  • Page 34: Square Root Linearization (Squar)

    NOTE After entering the last display value, the linearization entries must be saved (SAUE?) before they will be put into effect. However, you may move past this selection using the Up-arrow key if you need to go back and correct and earlier entry.

  • Page 35: Low-Flow Cutoff (Cutoff)

    4.5.11 Low-Flow Cutoff (CUTOFF) The low-flow cutoff feature allows the meter to be programmed so that the often unsteady output from a differential pressure transmitter, at low flow rates, always displays zero on the meter. The default cutoff is zero to prevent negative readings, but this may be overridden to allow them. The cutoff value may be programmed from -0 to 99999.

  • Page 36: Error Message (Span Error)

    The Internal calibration menu is part of the Advanced features menu. Press and hold the Menu button for 5 seconds to enter the Advanced features menu. Press the Up- arrow button to scroll to the Internal Calibration menu (ICAL) and press Enter. The meter displays 4.000 mA.

  • Page 37: Operation

    5 Operation 5.1 Front Panel Buttons Operation 5.2 Maximum & Minimum Readings (MAXIMUM & MINIMUM)) The maximum and minimum (peak & valley) readings reached by the rate are stored in the meter since the last reset or power-up. The meter shows MAXIMUM or MINIMUM to differentiate between run mode and max/min display.

  • Page 38: Reset Meter To Factory Defaults

    5.3 Reset Meter to Factory Defaults When the parameters have been changed in a way that is difficult to determine what’s happening, it might be better to start the setup process from the factory defaults. Instructions to load factory defaults: Enter the Advanced features menu.

  • Page 39: Factory Defaults & User Settings

    5.4 Factory Defaults & User Settings The following table shows the factory setting for most of the programmable parameters on the meter. Next to the factory setting, the user may record the new setting for the particular application. Model: ______________ S/N: _______________ Date: _________ Parameter Display...

  • Page 40: Troubleshooting

    6 Troubleshooting The rugged design and the user-friendly interface of the meter should make it unusual for the installer or operator to refer to this section of the manual. If the meter is not working as expected, refer to the recommendations below. 6.1 Troubleshooting Tips Symptom Check/Action...

  • Page 41: Quick User Interface Reference

    7 Quick User Interface Reference Pushbutton Function Menu Go to Programming Mode or leave Programming, Advanced Features, and Max/Min Modes. Right Arrow Move to next digit or decimal point position. Reset Total. Up Arrow Move to next selection or increment digit. Go to Max/Min Mode. Enter/Ack Accept selection/value and move to next selection.
  • Page 42 Main Menu Advanced Menu...
  • Page 43 Tek-Trol is a fully owned subsidiary of TEKMATION LLC. We offer our customers a comprehensive range of products and solutions for process, power and oil & gas industries. Tek-Trol provides process measurement and control products for Flow, Level, Temperature & Pressure Measurement, Control Valves & Analyzer systems. We are present in 15 locations globally and are known for our knowledge, innovative solutions, reliable products and global presence.

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