Teledyne 7320 Operating Instructions Manual page 79

Infrared Gas Analyzer
put is either dead or
fully saturated.
C. Meter reads Negative
(with zero gas flowing
through analyzer)
D. Meter Up Scale or
Overscale
E. Insufficient Span
Control (with span gas)
F. Noisy or Erratic
Teledyne Analytical Instruments
(b) Check that power supply voltages
are correct (+15VDC, Ä15VDC).
(c) Check that infrared source is
operating. If no light, check
source element resistance and
connections.
(d) Try to execute a manual zero.
(a) ZERO control may be
misadjusted.
Adjust control to bring indication
up to zero. (refer to Section 4).
(b) Check that infrared source is
operating. If no light check source
element resistance and connections.
(a) Redo full calibarion.
(b) Check for obstruction in sample
beam path.
(c) Check for excessive moisture in
plumbing and sample chamber. Clean
and replace sample chamber.
(a) Recheck zero for excessive off-
set.
(b) Check modulation factor using
certified span gas.
The most eommon sources of
Maintenance 5
5-7