11
6.
TROUBLESHOOTING
Coarse Zero Procedure:
If the display shows
"nogo"
in clean air during auto zero, press
and hold the RESET switch on the front panel while turning the selector switch from AUTO
ZERO to some other scale and back to AUTO ZERO again. Please note that you
must
carry out
this procedure starting with the
"nogo"
display; if the instrument was turned off after
"nogo"
was
displayed, select AUTO ZERO again, wait until
"nogo"
is displayed and proceed as described
above. For RGA-611 and RGA-612 detectors use the ppm H
2
S scale in place of AUTO ZERO in
this procedure.
Problem
Probable Cause
Action
1. Display is blank and pump
does not operate.
•
Batteries are too low or
spent.
•
Replace batteries (see Section 5
"Change of Batteries").
2. Batteries are replaced but
display is blank and pump
does not run.
•
One or more batteries were
inserted with the wrong
polarity.
•
Re-insert batteries with proper
polarity.
•
One or more batteries are
too low.
•
Replace batteries with a new set.
3. The Display shows
"bloc".
•
The intake to the instrument
is blocked.
•
Check probe tip and water-block
filter, drain probe, and dry probe
and filter by shaking.
•
There is water in the probe.
•
Detach probe from water-block
filter, drain probe, and dry probe
and filter by shaking.
•
Limit set incorrectly.
•
See Section 11-E.
4. The display does
not
show
"bloc"
when the probe tip is
blocked.
•
There is a leak between the
probe tip and the pump.
•
Tighten connections of probe.
Check hose and probe for
cracks.
•
Disconnect hose and block
intake. If
"bloc"
does not
appear, clean or replace pump.
•
Limit set incorrectly.
•
See Section 11-E.
5. The display shows
"nogo"
prior to
"End"
when on
AUTO ZERO scale.
•
Ambient concentration of
methane or CO is high.
•
Repeat zero in clean air.
•
Detector will not purge.
•
Check pump by blocking. If
'bloc"
appears repeat zero in
clean air (see coarse "zero").
•
A sensor zero has drifted
too far.
•
See "coarse zero" above.
6. The display shows
"FAIL"
and a sensor name
.
•
The natural gas or oxygen
sensor has failed.
•
Replace indicated sensor.
WARNING:
Do not open a sensor under any conditions. Sensors must be replaced only by
personnel trained in instrument service.
WARNING:
Do not operate an instrument which fails to show
"bloc"
when the intake is blocked.
Clean the pump or return the instrument for repair. See the inside of the front cover
(limited warranty) on how to return an instrument.
