Tek-Trol Tek-LCD 7802A Instruction Manual

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Technology Solutions

TEK-LCD 7802A

NEMA 4X Loop-Powered Flow Rate/Totalizer Indicator

Instruction Manual

Document Number: IM-7802A

www.tek-trol.com

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www.tek-trol.com

NOTICE

Read this manual before working with the product. For personal and system safety, and for optimum product performance, make sure you thoroughly understand the contents before installing, using, or maintaining this product. For technical assistance, contact Customer Support 796 Tek-Drive Crystal Lake, IL 60014 USA Tel: +1 847 857 6076, +1 847 655 7428

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. The information contained in this manual is subject to change without notice.

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Table of Contents

1 Safety Instructions ......................................................................................................................... 4

1.1 Installation ........................................................................................................................................ 4

1.2 Unpacking ......................................................................................................................................... 4

1.3 Conduit/Stopping Plug ....................................................................................................................... 4

2 Product Description ....................................................................................................................... 5

2.1 Introduction ...................................................................................................................................... 5

2.2 Specifications ..................................................................................................................................... 5

2.3 Dimensional Drawing ......................................................................................................................... 8

2.4 Ordering Information ......................................................................................................................... 9

2.5 Mounting........................................................................................................................................... 9

3 Connections ................................................................................................................................ 10

3.1 Input Signal & Backlight Connections ................................................................................................ 11

3.2 External Reset Connection ............................................................................................................... 12

3.3 Open Collector Output Connections ................................................................................................. 13

4 Setup and Programming .............................................................................................................. 14

4.1 Overview ......................................................................................................................................... 14

4.2 Through-Window Buttons ................................................................................................................ 14

4.3 Buttons and Display ......................................................................................................................... 15

4.4 Main Menu Display Functions & Messages ....................................................................................... 16

4.4.1 Main Menu ............................................................................................................................................. 17

4.4.2 Setting Numeric Values........................................................................................................................... 18

4.4.3 Setting Up the Meter (SETUP) ................................................................................................................ 18

4.4.4 Setting the Decimal Point (dEc_PT) ........................................................................................................ 19

4.4.5 Programming the Meter (PRoG) ............................................................................................................. 20

4.4.6 Scaling the Meter (SCALE) ...................................................................................................................... 21

4.4.7 Calibrating the Meter (CAL) .................................................................................................................... 22

4.4.8 Setting the Time Base (tbAsE) ................................................................................................................ 23

4.4.9 Setting the Total Conversion Factor (totCF) ........................................................................................... 23

4.4.10 Manual or Automatic Total Reset Function (t rST) ............................................................................. 24

4.4.11 Setting the Tag Display (tAG).............................................................................................................. 25

4.4.12 Setting Up the Password (PASSWRD) .................................................................................................... 26

4.4.13 Disabling Password Protection ........................................................................................................... 26

4.4.14 Service Feature (SERVICE) ................................................................................................................... 27

4.5 Advanced Features Menu & Display Messages .................................................................................. 28

4.5.1 Advanced Features Menu ....................................................................................................................... 29

4.5.2 Alarm & Pulse Output (OUTPUT) ............................................................................................................... 30

4.5.3 Alarm Output (Alrm) ................................................................................................................................ 30

4.5.4 Pulse Output K-Factor (PulsE) ................................................................................................................. 31

4.5.5 Advanced Function Selection (FUNCTN) ................................................................................................... 31

4.5.6 Multi-Point Linearization (lnEAr) ............................................................................................................ 31

4.5.7 Manual Entry (SCALE) ............................................................................................................................. 31

4.5.8 External Calibration (CAL) ....................................................................................................................... 31

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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) .............................................................................................................................. 34

5 Operation .................................................................................................................................... 35

5.1 Front Panel Buttons Operation ......................................................................................................... 35

5.2 Maximum & Minimum Readings (

5.3 Reset Meter to Factory Defaults ....................................................................................................... 36

5.4 Factory Defaults & User Settings ...................................................................................................... 37

MAXIMUM & MINIMUM)) .................................................................... 35

6 Troubleshooting .......................................................................................................................... 38

6.1 Troubleshooting Tips........................................................................................................................ 38

7 Quick User Interface Reference .................................................................................................... 39

7.1 Operational Modes .......................................................................................................................... 39

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WARNING

• Risk of electric shock or personal injury.

• This product is not recommended for life support applications or applications

where malfunctioning could result in personal injury or property loss. Anyone using this product for such applications does so at his/her own risk. Tek-Trol LLC shall not be held liable for damages resulting from such improper use.

• Failure to follow installation guidelines could result in death or serious injury.

Make sure only qualified personnel perform the installation.

CAUTION

Read complete instructions prior to installation and operation of the meter.

Disclaimer

The information contained in this document is subject to change without notice. Tek- Trol makes no representations or warranties with respect to the contents hereof; and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.

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.

Registered Trademarks

All trademarks mentioned in this document are the property of their respective owners.

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WARNING

• Installation and service should be performed only by trained service personnel. Service

requiring replacement of internal components must be performed at the factory.

• Disconnect from supply before opening enclosure. Keep cover tight while circuits are

alive.

• 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.

WARNING

Hazardous voltages may exist within enclosure. Installation and service should be performed only by trained service personnel.

1 Safety Instructions

1.1 Installation

Wiring connectors are accessed by opening the enclosure. To access electrical connectors, remove the 2 captive screws, then disconnect the ribbon cable from the display module and set the display module aside.

1.2 Unpacking

Remove the meter from box. Inspect the packaging and contents for damage. Report damages, if any, to the carrier.

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.

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General

Display

Five digits

(-9999 to 99999)

0.70" (0.05ft) high, 7-segment, automatic lead zero blanking.

Seven characters (Total and/or Tag)

0.4" (0.03ft) high, 14-segment. 7-digit Totalizer 9,999,999

Symbols

High, Low, & Set Alarm, Password Lock

Backlight

White

Display Update Rate

Ambient > -25°C: 2 Updates/Second Ambient < -25°C: 1 Update/5 Seconds

Overrange

Display flashes 99999

Underrange

Display flashes -9999

Programming Method

Four through-window buttons when cover is installed. Four internal pushbuttons when cover is removed.

Noise Filter

Programmable Lo, med, HI, or

OFF

Recalibration

Recalibration is recommended at least every 12 months.

Max/Min Display

Max/Min readings reached by the process are stored until reset by the user or until power to the meter is turned off.

Password

Programmable password restricts modification of programmed settings.

Non-Volatile Memory

All programmed settings and total reading are stored in non- volatile memory for a minimum of ten years if power is lost.

Normal Mode Rejection

64 dB at 50/60 Hz

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. The numeric rate display will read up to 99999 and the alphanumeric total/tag display will read up to 9999999. The alphanumeric display can also be programmed to show any combination of numbers and letters up to seven characters long for use as engineering units and/or the process identification tag. The backlight lets you see the display under any lighting condition and can be powered from either the 4-20 mA loop or from a separate DC power supply.

The enclosure has three threaded conduit holes, integrated pipe or wall mounting flanges, and allows for easy installation of tamper seals.

2.2 Specifications

Except where noted all specifications apply to operation at +25°C.

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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

Enclosure

NEMA 4X, IP65 plastic field enclosure. Color: grey.

Three ¾ NPT threaded conduit openings. One ¾ NPT plastic conduit plug, with 1.29 wrenching flats and a screwdriver slot, is included.

Mounting

May be mounted directly to conduit. Two slotted flanges for wall mounting

or NPS 1½ to 2½ or DN 40 to 0.21ft pipe mounting. See DIMENSIONAL

DRAWING on page 7.

Overall Dimensions

5.67 x 5.25 x 4.18 (W x H x D) (0.47ft x 0.43ft x 0.34ft)

Weight

1.65 lbs (26.4 oz, 0.75 kg)

Warranty

3 years parts and labor

Input

Accuracy

±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span.

Advanced Function

Linear, square root, or programmable exponent

Multipoint Linearization

2 to 32 points

Programmable Exponent

1.0001 to 2.9999

Low Flow Cut- Off

0-99999 (0 disables cutoff function)

Temperature Drift

50 PPM/°C from -40°C to 75°C (-40℉ to 167℉) ambient

Decimal Point

User selectable decimal point

Totalizer

Calculates total based on rate, time base of second, minute, hour, or day, and field programmable multiplier; stored in non-volatile memory upon power loss.

Totalizer Reset

User selectable via through-window buttons, time delay, external contact closure, or protected

Calibration Range

An Error message will appear if input 1 and input 2 signals are too close together.

Input Range

Minimum Span Input 1 & Input 2

4-20 mA

0.10 mA

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Maximum Voltage

Drop

Without Backlight or with Externally-Powered (DC Powered) Backlight

With Loop-Powered Backlight

3.0 VDC @ 20 mA

6.0 VDC @ 20 mA

Equivalent Resistance

-150 Ω @ 20 mA

300 Ω @ 20 mA

Externally Powered

Backlight

Voltage Range:

Maximum Power

9-36 VDC.

9 VDC 12VDC 24VDC 36VDC

0.2 W 0.25 W 0.5 W 0.75 W

Input Overload

Over current protection to 20 mA max.

Open Collector Output

Rating

Isolated open collector, 30 VDC @ 150 mA max.

Alarm Output

Assign to rate for high or low alarm trip point. Assign to total for total alarm trip point.

Deadband

0-100% FS, user selectable

Acknowledge

Front panel ACK button resets output and screen indication.

Pulse Output K-Factor

K-factor programmable from 0.0001 to 99999. One pulse is generated for every total increment selected (e.g. K-factor value of 100 will generate one pulse every time the total is incremented by 100 units).

If the pulse output exceeds the programmed output frequency, pulses are accumulated as pending and are not lost. Pulses will continue to output until the buffer is emptied or the total is reset from the front panel.

Pulse Output Frequency

Programmable frequency: 2, 4, 8, 16, 32, 64, 128 Hz. Minimum pulse width: 3.9 ms @ 128 Hz

Maximum pulse width: 250 ms @ 2 Hz Factory default pulse width: 31 ms @ 16 Hz

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2.3 Dimensional Drawing

Enclosure Dimensions – Front View

Enclosure Dimensions – Side Cross Section View

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Model

Description

Tek-LCD 7802A-0K1

NEMA 4X Loop-Powered Flow Rate/Totalizer

Model

Description

Tek-LCD 7800A-PLUG75P

3/4 NPT Plastic Conduit Plug

Tek-LCD 7800A-6846

Steel Pipe Mounting Kit

Tek-LCD 7800A-6846SS

Stainless Steel Pipe Mounting Kit

WARNING

Do not attempt to loosen or remove flange bolts while the meter is in service.

2.4 Ordering Information

Popular Model

Accessories

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.

Refer to Dimensional Drawing, page 8 for details.

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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.

SIGNAL +

4-20 mA signal input positive terminal connection

SIGNAL -

4-20 mA signal return/negative terminal connection when not using loop powered backlight.

BACKLIGHT +

+9-30 VDC when powering backlight from external supply.

BACKLIGHT -

4-20 mA signal return/negative terminal when using the installed loop powered backlight or ground/negative when powering backlight from external supply.

OUTPUT+

NPN open collector output positive.

OUTPUT-

NPN open collector output negative.

RESET +

Contact closure reset pullup to 3 VDC

RESET-

Contact closure reset ground/negative.

WARNING

Observe all safety regulations. Electrical wiring should be performed in accordance with all agency requirements and applicable national, state, and local codes to prevent damage to the meter and ensure personnel safety.

3 Connections

To access the connectors, remove the enclosure cover and unscrew the two captive screws that fasten the display module. Disconnect the ribbon cable and remove the display module. Signal connections are made to a four-terminal connector in the base of the enclosure.

Refer to Figure 1 for terminal positions.

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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. The loop-powered backlight configuration requires a total maximum voltage drop of 6 V. The backlight is recommended for dim lighting conditions and is enabled when wired as shown in Figure 3 or Figure 4.

Figure 2. Input Connections without Backlight

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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. Connect to a contact closure source such as a relay or a pushbutton as shown in Figure 5.

Figure 5. Reset Connections

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3.3 Open Collector Output Connections

Output connections are made to two terminals labelled OUTPUT. Connect to an input device such as alarm indicator or pulse counter as shown in 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.

Figure 6. Connection to Device with Internal Pull-Up

Figure 7. Output Connections

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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.

4 Setup and Programming

4.1 Overview

Setup and programming are done through the infrared through-window buttons or using the mechanical buttons when uncovered. There are two slide switches located on the connector board. One is used to select backlight power (if equipped) and the other is to lock or unlock the throughwindow buttons.

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. To actuate a button, press one finger to the window directly over the marked button area. When the cover is removed, the four mechanical buttons located next to the sensors are used. The sensors are disabled when a mechanical button is pressed and will automatically be re-enabled after 60 seconds of inactivity.

The through-window buttons are designed to filter normal levels of ambient interference and to protect against false triggering, however, it is recommended that the through-window buttons be disabled (slide switch to LOCK) if there is an infrared interference source in line-of-sight to the display.

Through-Window Button Tips:

• To remove cover with power applied (safe area only), or to clean the window, select SERVICE in

the main menu before opening the cover. This will temporarily disable the through-window buttons for 60 seconds to prevent inadvertent use. Use the mechanical buttons while the meter is open.

• To the extent possible, install the display facing away from sunlight, windows, reflective objects

and any sources of infrared interference.

• Keep the window clean.

• Tighten the cover securely.

• Use a password to prevent tampering.

After all connections have been completed and verified, apply power to the loop.

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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.

• Press the Enter button to access a menu or to accept a setting.

• Press and hold the Menu button for five seconds to access the Advanced features of the meter.

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Display

Parameter

Action/Setting

SETUP

Setup

Enter Setup menu

DEC..pt

Decimal point

Enter Decimal Point menu

Rate

Rate decimal

Set rate display decimal point

totAl

Total decimal

Set total display decimal point

PRoG

Program

Enter the Program menu

sCAlE

Scale

Enter the Scale menu

CAl

Calibrate

Enter the Calibrate menu

Inpt1

Input 1

Calibrate input 1 signal or program input 1 value

DspL1

Display 1

Program display 1 value

Inpt2

Input 2

Calibrate input 2 signal or program input 2 value

DsPl2

Display 2

Program display 2 value

Span Error

Error, calibration not successful, check signal

TbASE

Time Base

Enter the Time Base menu

sEc

Second

Units per second

min

Minute

Units per minute

hour

Hour

Units per hour

dAy

Day

Units per day

TotCF

Conversion Factor

Enter the Conversion Factor menu

T rST

Total Reset

Enter the Total Reset menu

Auto

Automatic

Automatic Total Reset

T DELAY

Time Delay

Automatic Reset Time Delay

M An

Manual

Manual Total Reset

EnAbl

Enable

Enable Manual reset

DisplAy

Parameter

Action/Setting

dsAbl

Disable

Disable Manual reset

tAG

Tag/Units

Enter the Tag/Units Menu

Tag On

Enable Tag/Units

OFF

Tag Off

Disable Tag/Units

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.

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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

-99999

Flashing display

Overrange condition Underrange condition

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. Press Menu button to enter Programming Mode then press the Up Arrow button to scroll through the main menu.

Press Menu button to enter Programming Mode then press the Up Arrow button to scroll through the main menu.

• Press Menu, at any time, to exit and return to Run Mode. Changes made to set- tings prior to

pressing Enter are not saved.

• Changes to the settings are saved to memory only after pressing Enter.

• The display moves to the next menu every time a setting is accepted by pressing Enter.

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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.

The decimal point is set using the Right or Up arrow button in the Setup-decimal point menu.

4.4.3 Setting Up the Meter (SETUP)

The Setup menu is used to select:

1. Rate and total decimal point position

2. Program menu

3. Rate and total tag display

4. Time base

5. Total conversion factor

6. Manual or automatic total reset function

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.

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dec.pt

Select Total

Decimal Point

ToTAL

ddddd.dd

dd.ddd

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.

Pressing the Right arrow moves the decimal point one place to the right until no decimal point is displayed. Pressing the Up arrow moves the decimal point one place to the left.

Select Rate Decimal Point

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NOTE

The Scale and Calibrate functions are exclusive of each other. The meter uses the last function programmed. Only one of these methods can be employed at a time. The Scale and Calibrate functions can use up to 32 points (default is 2). The number of points should be set in the Advanced menu under the Multi-Point Linearization (linear) menu selection prior to scaling and calibration of the meter, see page 37 for details.

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.

• Use the Scale menu to enter the default 2-point scaling without a signal source - or

• Use the Calibrate menu to apply a signal from a calibrator or a flowmeter for the default 2-

point scaling.

Additional parameters, not needed for most applications, are viewed and program- med

with the Advanced features menu, see Advanced Features Menu page 29.

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For instructions on how to program numeric values see 4.4.2 Setting Numeric Values, page 18.

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

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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.

1. Press the Up-arrow button to scroll to the Calibration menu (cAL) and press Enter.

2. The meter displays Inpt1. Apply a known signal and press Enter. The display will flash

while accepting the signal.

3. After the signal is accepted, the meter displays dspl1 Press Enter.

Enter a corresponding display value for the signal input, and press Enter to accept.

4. The meter displays Inpt2. Apply a known signal and press Enter. The display will flash

while accepting the signal.

5. After the signal is accepted, the meter displays dspl2. Press Enter. Enter a corresponding

display value for the signal input and press Enter to accept.

6. After completing calibration, the save? display will need to be acknowledged using the Enter key

before calibration will take effect.

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Day

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.

Re-Calibrating the Internal Calibration Reference (ICaL)

The Internal Calibration (ICAL) menu, located in the Advanced features menu, is used to recalibrate the internal calibration reference. Recalibration is recommended at least every twelve months. Refer to Internal Calibration (ICAL), page 33 for instructions.

4.4.8 Setting the Time Base (tbAsE)

The meter calculates total based on rate and a time base of units per second, minute, hour, or day. Press the Enter button, at any time, to accept a setting or Menu button to exit without saving changes. X

4.4.9 Setting the Total Conversion Factor (totCF)

Total Conversion Factor is used to convert to a different unit of total display. For example, to display rate in gallons and total in litters, enter a conversion factor of 3.7854. When rate and total units are the same, the Conversion Factor should be 1.0000. Press the Enter button, at any time, to accept a setting or Menu button to exit without saving changes.

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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 → Alrm → totAl. Once the set point is reached, the meter waits for a programmed amount of time (t dly) and then resets the total to zero.

• To enable total reset by Reset button, choose m An → EnAbl.

• To disable total reset by Reset button, choose m An → dsAbl.

• To reset total upon total alarm set point, choose auto, enter a time delay (tdly), and proceed

to programming the set point, see page 30. Press the Enter button, at any time, to accept a setting or Menu button to exit without saving changes.

Press the Enter button, at any time, to accept a setting or Menu button to exit without saving changes.

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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.

• To automatically cycle the lower display between total reading for ten seconds and tag for two

seconds, choose tOGlE.

• To disable the tag display and show only total reading uninterrupted on the lower display,

choose Off.

• To show tag only on the lower display choose On. Totalizing continues in the background but is

not shown while On is selected.

Selecting On or tOGlE prompts for entry of the tag.

The unit being changed blinks. Press the Enter button, at any time, to accept a setting or Menu button to exit without saving changes.

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Model:

Serial Number:

Password:

__- - - - -

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.

Record the password for future reference. If appropriate, it may be recorded in the space provided.

Making Changes to a Password Protected Meter

If the meter is password protected, the meter will display the message LOCKED when the Menu button is pressed. Press the Enter button while the message is being displayed and enter the correct password to gain access to the menu. After exiting the programming mode, the meter returns to its password protected condition.

4.4.13 Disabling Password Protection

To disable the password protection, access the Password menu and enter the correct password twice, as shown below. The meter is now unprotected until a new password is entered.

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Did you forget the password?

The password may be disabled by entering a master password. If you are authorized to make changes, enter the master password 50865 to unlock the meter.

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. To try again, press Enter while the Locked message is displayed.

4.4.14 Service Feature (SERVICE)

Select SERVICE from the main menu to temporarily disable the through-window buttons to prevent inadvertent use. Buttons will automatically resume operation after 60 seconds. The display blinks the message SERVICE during this period. This should be used when cleaning the window and when installing or removing the cover while power is applied (in a safe area only). The service menu is not shown when the through-window buttons are disabled using the slide switch located on the connector board.

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Display

Parameter

Action/Setting

OUTPUT

Output

Enter output menu

OFF

Off

Disable output

Alrm

Alarm Output

Enter alarm output menu

RStE

Rate Alarm

Assign alarm output to rate

TotAl

Total

Assign alarm output to total

SEt

Set Point

Program set point

REsEt

Reset Point

Program reset point

PulsE

Pulse Output

Program pulse output K-factor

MAX HZ

Frequency

Program pulse output maximum frequency

Funct

Function

Enter advanced function menu

LnEAr

Linear

Set linear scaling

SquAr

Square Root

Set square root extraction

ProG-E

Programmable Exponent

Set programmable exponent

CUTOFF

Low-Flow Cutoff

Set low-flow cutoff

FILTER

Filter

Set noise filter

OFF

Filter Off

Disable noise filter

Filter Low

Set noise filter to low setting

NmED

Filter Medium

Set noise filter to medium setting

Filter High

Set noise filter to high setting

ICAL

Internal Calibration

Enter internal reference calibration

INFO

Meter Information

Show software number and version, or reset to factory defaults

SFT

Software

Software number

vEr

Software Version

Software version

RESET

DFALTS?

Reset Defaults

Restore factory default parameter settings For instructions on how to program numeric values see 4.2.2 Setting Numeric Values, page 18.

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.

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Hold for five seconds

Run Mode

INFO

ICAL

3024.7

74325.68

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.

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SET

TOTAL

08.000

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. The output may be disabled by selecting off. When alarm indication is enabled, the HI and LO symbols are used accompanied by a flashing display. The alarm status will show on the display even if the output is not wired.

4.5.3 Alarm Output (Alrm)

• Rate high alarm trip point: program set point above reset point.

• Rate low alarm trip point: program set point below reset point.

• Rate alarm deadband is determined by the difference between set and reset points. Minimum

deadband is one display count. If set and reset points are programmed the same, output will

reset one count below set point.

• Total alarm trip point: program total set point. Alarm reset is triggered by total reset (There is

no reset parameter entered for total). If automatic total reset is enabled, this setting will be

the trigger point for the timer. It is not necessary to have the output wired for automatic reset

function to work.

To acknowledge an alarm, press the Enter button once for acknowledge prompt and a second time to confirm.

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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. Pulses will continue to output until the buffer is emptied or the total is reset from the front panel.

4.5.5 Advanced Function Selection (FUNCTN)

The Advanced Function menu is used to select the advanced function to be applied to the input: linear, square root, programmable exponent, or round horizontal tank volume calculation. The multi-point linearization is part of the linear function selection. Meters are set up at the factory for linear function with 2-point linearization. The linear function provides a display that is linear with respect to the input signal.

4.5.6 Multi-Point Linearization (lnEAr)

Up to 32 linearization points can be selected under the Linear function. The multi-point linearization can be used to linearize the display for non-linear signals such as those from level transmitters used to measure volume in odd-shaped tanks or to convert level to flow using weirs and flumes that require a complex exponent. These points are established via direct entry (SCALE) or with an external calibration signal (CAL).

4.5.7 Manual Entry (SCALE)

Manual entry of the linearization data is done once the number of points has been selected (NO PTS). Input signal levels (InP 1-32) for up to 32 points, along with the desired/corresponding meter reading (dSP 1-32) should be entered for each linearization point. See Figure 9 on page 31.

4.5.8 External Calibration (CAL)

Linearization data can be entered using a known accurate signal source (InP 1-32) and then entering the desired/corresponding meter reading (disp 1-32) for that in-put signal level. See Figure 9 on page 31.

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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. Once confident in the entries however, the user must navigate back to the Save menu screen (SAUE?) and press the Enter key to save the changes.

Figure 9. Multi-Point Linearization Menu

4.5.9 Square Root Linearization (SquAr)

The square root function can be used to linearize the signal from a differential pressure transmitter and display flow rate in engineering units.

4.5.10 Programmable Exponent Linearization (ProG.E)

The programmable exponent can be used to linearize the signal from level transmitters in openchannel flow applications using weirs and flumes.

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NOTE

The signal source must have a full-scale accuracy of 0.002% or better between 4 and 20 mA in order to maintain the specified accuracy of the meter. Allow the meter to warm up for at least 15 minutes before performing the internal calibration procedure.

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. Below the cutoff value, the meter will display zero. Selecting either square root or programmable exponent will set the cutoff value to 0. Program the cutoff value to 0 to disable.

4.5.12 Input Signal Filter (FILTER)

The noise filter is available for unusually noisy signals that cause an unstable process variable display. The noise filter averages the input signal over a certain period. The filter level can be set to low (LO), medium (mEd), high (HI), or off (OFF). The higher the filter setting, the longer the averaging time and so the longer the display may take to find its final value. The filter contains a noise filter bypass feature so that while small variations in the signal will be filtered out, large, abrupt changes to the input signal are displayed immediately.

4.5.13 Internal Calibration (ICAL)

The internal calibration allows the user to scale the meter without applying a signal. The use of a calibrated signal source is necessary to perform the internal calibration of the meter. Check calibration of the meter at least every 12 months.

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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 Uparrow button to scroll to the Internal Calibration menu (ICAL) and press Enter. The meter displays 4.000 mA. Apply a 4.000 mA signal and press Enter. The display flashes for a moment while the meter is accepting the signal. After the signal is accepted, the meter displays 20.000 mA. Apply a 20.000 mA signal and press Enter. The display flashes for a moment while the meter is accepting the signal.

4.5.14 Error Message (SPAn ERROR)

An error message indicates that the calibration process was not successful. After the error message is displayed, the meter will revert to input 2 calibration settings. The error message might be caused by inadvertently leaving the signal at the previous level or not maintaining the minimum span. Press the Menu button to cancel the current calibration process if necessary.

4.5.15 Information (INFO)

The Internal calibration menu is part of the Advanced features menu. It shows software identification number and version number. To determine the software version of a meter: Go to the Information menu (INFO) and press Enter button. Continue pressing Enter to scroll through the software release number and software version. Following the information display, the meter will exit the Advanced features menu and return to run mode.

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Run Mode

10 Sec Time Out

2457.7

4065.3

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. Press Enter to remain in Max/Min display mode. If Enter is not pressed, the Max/Min display reading will time out after ten seconds. The meter will return to display the actual reading.

Press Up to Display and to

Toggle Between Max & Min

Press Enter to hold Max/Min

Press Right to Reset Max/Min

Press Menu to Exit Max/Min

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INFO

Flashing Display

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. Press and hold Reset button when INFO is shown. Press Enter when RESET DFALTS? prompt is shown Note: If Enter is not pressed within three seconds, the prompt will stop flashing return to showing INFO.

Press and Hold for 5 sec

Defaults Restored

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Parameter

Display

Default Setting

User Setting

Programming

PROGRAM

Scale

Input 1

InPt1

4.000 mA

Display 1

Dspl1

4.000

Input 2

InPt2

20.00 mA

Display 2

Dspl2

20.000

Decimal point rate

Dd.ddd

3 places

Decimal point total

Dddddd.dd

2 places

Tag

tAG

Off Time Base

tbAsE

Minute

Conversion Factor

TotCF

1.0000

Total Reset Function

T rst

Manual - Enabled

Password

PASSWRD

00000 (unlocked)

Advanced Features

Output

OUTPUT

Off

Function

FUNCTN

Linear

Cutoff

CUTOFF

0 (disabled)

Filter

FILTER

Low

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: _________

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Symptom

Check/Action

No display or faint display

Check input signal connections. Perform hard reset by shorting S+ and S- terminals.

Rate display unsteady

Increase filter setting in Advanced menu.

Meter displays error message during calibration (SpAn eRROR)

Check signal connections. Verify minimum input span requirements

Meter flashes 99999 or -9999

Check input signal is within scaled range of 99999 and -9999.

Display stuck displaying

Maximum or Minimum

Press Menu to exit Max/Min display readings.

Display response is too slow

Check filter setting to see if it can be lowered to LO

or OFF.

If the display locks up or the meter does not respond at all

Perform hard reset by shorting S+ and S- terminals.

Backlight does not appear.

Backlight is intended for viewing assistance in dim lighting conditions. It may not be noticeable under good lighting conditions.

Check connections are as shown in Figure 3 or Figure 4 on page

12.

Other symptoms not described above

Call Technical Support for assistance.

Through-window buttons do not respond

Service menu was selected, or mechanical button was pushed. The through-window buttons will be re- enabled automatically

60 seconds after the last button push. If slide switch on connector board is in Lock position, switch to

Unlock. Sunlight can interfere with the sensors. It is recommended to shield

the window from sunlight while operating the buttons by standing so as to block direct sunlight.

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

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Pushbutton Function Menu Go to Programming Mode or leave Programming, Advanced

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.

Menu held for 5 seconds enters Advanced Features Menu

Max/Min Mode

While in Run Mode, pressing Up Arrow will initiate Max/Min Mode. Up Arrow toggles between Max & Min displays, and Right Arrow resets the Max/Min to the current value. Press Menu or wait 10 seconds to return to Run Mode. Pressing Enter/Ack will disable the 10 second timeout and continuously display Max or Min.

7 Quick User Interface Reference

Features, and Max/Min Modes.

Acknowledge Alarm.

7.1 Operational Modes

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Main Menu Advanced Menu

Page 43

TEKMATION LLC reserves the right to change the designs and/or materials of its products without notice. The contents of this publication are the property

www.tek-trol.com

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.

Tek-Trol LLC

TEKMATION LLC DOC#TEK/MR/MNL/IM-7802A/0219/A

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Tel.: +1 847 857 6076 , +1 847 655 7428 Fax: +1 847 655 6147

Email: tektrol@tek-trol.com

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