Analytical Industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter - Manual (Page 37)

Advanced Instruments, Inc
37
or
No O
2
reading
accompanied by
electrolyte leakage
suddenly removing the
restriction draws a vacuum
on the sensor
or
partially opened valves
upstream of the transmitter
when using a pump
downstream of the
transmitter to draw sample
from a process at
atmospheric pressure or
under a slight vacuum.
Placing a vacuum on the
sensor in excess 10” of water
column is strongly
discouraged.
A premature adjustment of
the ZERO OFFSET
potentiometer is a common
problem
Avoid drawing a vacuum on the sensor, a
pressurized sensor may not leak but still
produce negative readings.
From MAIN MENU select DEFAULT ZERO