Tek-Trol Tek-LCD 7802A, Instruction Manual, Page: 7 / 43

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.
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