Tek-Trol TEK-LCD 7800A-0L1, Инструкция по эксплуатации, Страница: 7 / 36

2 Product Description
2.1 Introduction
The Tek-LCD 7800A-0L1 is a plastic field mounted loop-powered meter fully featured for
demanding applications in the harshest environmental conditions. The bar graph representation
of the process input is perfect for level applications and allows for quick assessment of current
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 display will read up to 99999 and the alphanumeric display can be
programmed to show any combination of numbers and letters up to seven characters long for use
as engineering units, the process identification tag or a display for the calculated volume when
using for level applications. 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 (77°F).
GENERAL
DISPLAY
Five Digits Top
Display
(-9999 to 99999)
0.6" (0.05 ft) high, 7-segment, automatic lead
zero blanking.
Seven Characters
0.4" (0.03 ft) high, 14-segment
Symbols
Bar Graph which displays process input from 0-100%
of scaled value.
Backlight
White
DISPLAY UPDATE RATE Ambient > -13°F (-25°C): 2 Updates/Second
Ambient < -13°F (-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 are stored in non-volatile memory for a minimum
of ten years if power is lost.