Tek-Trol Tek-LCD 7802A Instruction Manual
Technology Solutions
TEK-LCD 7802A
NEMA 4X Loop-Powered Flow Rate/Totalizer Indicator
Instruction Manual
Document Number: IM-7802A
www.tek-trol.com
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
© 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. The information contained in this manual is subject to change without notice.
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
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
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.
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.
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.
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
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.
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.
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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