Teledyne 3000ZA2G - Zirconium oxide analyzer - Manual (Page 68)

Maintenance 3000ZA2G
Teledyne Analytical Instruments 56
 2 line, 20 character, alphanumeric, VFD display
 RS-232 Communications Port
See the drawings in the Drawings section in back of this manual for
details.
5.6 Cleaning
If instrument is unmounted at time of cleaning, disconnect the
instrument from the power source. Close and latch the front-panel access
door. Clean outside surfaces with a soft cloth dampened slightly with plain
clean water. Do not use any harsh solvents such as paint thinner or benzene.
For panel-mounted instruments, clean the front panel as prescribed
in the above paragraph. DO NOT wipe front panel while the instrument
is controlling your process.
5.7 Troubleshooting
Table 5-2: Troubleshooting
Problem Possible Cause Solution
Erratic readings of the
oxygen concentration
as reported by the
analyzer
Analyzer may have
been calibrated in an
inaccurate fashion. Recalibrate analyzer,
making sure the
proper gas is fed, and
the proper value of
span gas is input.
Atmospheric oxygen
diffusing through vent
and altering the
oxygen level the
sensor sees Increase flow rate
and/or length of vent
tubing to dilute or
minimize oxygen
diffusion from vent to
sensor.
Inaccurate zero
operation Zero calibration using a
gas with a
concentration different
from air. Rezero the instrument
using air.