Tek-Trol Tek-LCD 7802A User manual

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www.tek-trol.com
TEK-LCD 7802A
NEMA 4X Loop-Powered Flow Rate/Totalizer Indicator
Instruction Manual
Document Number:IM-7802A

© COPYRIGHT Tek-Trol LLC 2016
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: [phone]
www.tek-trol.com
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.

Table of Contents
1Safety Instructions.........................................................................................................................4
1.1 Installation ........................................................................................................................................ 4
1.2 Unpacking ......................................................................................................................................... 4
1.3 Conduit/Stopping Plug ....................................................................................................................... 4
2Product Description.......................................................................................................................5
2.1 Introduction ...................................................................................................................................... 5
2.2 Specifications..................................................................................................................................... 5
2.3 Dimensional Drawing......................................................................................................................... 8
2.4 Ordering Information ......................................................................................................................... 9
2.5 Mounting........................................................................................................................................... 9
3Connections ................................................................................................................................ 10
3.1 Input Signal & Backlight Connections................................................................................................ 11
3.2 External Reset Connection ............................................................................................................... 12
3.3 Open Collector Output Connections ................................................................................................. 13
4Setup 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

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
5Operation.................................................................................................................................... 35
5.1 Front Panel Buttons Operation......................................................................................................... 35
5.2 Maximum & Minimum Readings (MAXIMUM &MINIMUM)) .................................................................... 35
5.3 Reset Meter to Factory Defaults ....................................................................................................... 36
5.4 Factory Defaults & User Settings ...................................................................................................... 37
6Troubleshooting .......................................................................................................................... 38
6.1 Troubleshooting Tips........................................................................................................................ 38
7Quick User Interface Reference.................................................................................................... 39
7.1 Operational Modes .......................................................................................................................... 39

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.
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.
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.

1Safety Instructions
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.
1.1 Installation
WARNING
Hazardous voltages may exist within enclosure. Installation and service should be performed
only by trained service personnel.
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.

2Product 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.
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

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

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

2.3 Dimensional Drawing
Enclosure Dimensions –Front View
Enclosure Dimensions –Side Cross Section View
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2.4 Ordering Information
Popular Model
Model
Description
Tek-LCD 7802A-0K1
NEMA 4X Loop-Powered Flow Rate/Totalizer
Accessories
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
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.
WARNING
Do not attempt to loosen or remove flange bolts while the meter is in service.

3Connections
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.
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.
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.
Refer to Figure 1 for terminal positions.
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.

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

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

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

4Setup 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 through-
window 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.
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.

4.3 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.

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
D E C .. p t
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
Span Error
Error, calibration not successful, check signal
TbASE
Time Base
Enter the Time Base menu
sEc
Second
Units per second
m in
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
ON
Tag On
Enable Tag/Units
OFF
Tag Off
Disable Tag/Units

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 acceptedby pressing Enter.

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.