Instruction manual

Instruction Manual
748468-E
August 2003
5-2 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
Model MicroCEM SHS
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
a. Sample Flow valves not adjusted
properly
a. Adjust correct flow for analyzer(s)
b. No sample pressure to analyzer(s) b. Verify RV
1
is set for 8-12 psig
c. System in other than sample mode c. Place system in sample mode
d. Sample or guard filters plugged d. Inspect and replace as required
1. No flow or low sample flow to ana-
lyzer(s)
e. Pump diaphragm or valves have
failed
e. Replace pump diaphragm and
check valve operation
a. Trap drain full
a. Verify that Peristaltic pump is oper-
ating properly.
b. High thermoelectric cooler tem-
perature (above 45°F/7.2°C)
b. Verify that Peristaltic pump is oper-
ating properly.
c. Temperature setting is incorrect c. Correct setting
d. High ambient temperature
d. Ambient should be less than 90°F
(32
o
C)
e. Failed thermoelectric elements e. Inspect and replace as required
2. Water carryover to analyzer(s)
f. Cooling fan not operating or heat
exchanger blocked
f. 4. Verify operation of fan and ade-
quate ventilation around heat ex-
changer
a. Filter Element of F
1
contaminated
a. Remove element from system and
retest. If reading is within tolerance
now, then replace element with a
new one.
b. Sample line or Thermocooler con-
taminated.
b. Check operating temperature of all
heated zones.
Purge/backflush system with HC-
free air for 5-10 minutes. Re-
test. If still high, then sections of the
system will have to be individually
isolated and checked.
c. Leak in system (prior to pump)
which is diluting sample
c. Check sample line, pump dia-
phragm, Peristaltic Pump tubing.
3. Greater than 5% difference when
introducing calibration gas in local
mode and Remote mode (Sample
System Bias)
d. Insufficient flow of calibration gas to
sample probe
d. Set flow of calibration gas so that
sample inlet pressure is above 0 or
analyzer reading is maximized.
IB-103-102