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Teledyne API - Model 200EH/EM Operation Manual Troubleshooting & Repair
243
VACUUM
PRESSURE
SENSOR
SAMPLE
PRESSURE
SENSOR
O3 FLOW
SENSOR
FLOW PRESSURE
SENSOR PCA
INSTRUMENT CHASSIS
PMT
PERMAPURE
DRYER
NO/NO
X
VALVE
AUTOZERO
VALVE
O
3
Scrubber
O
3
GENERATOR
O
3
Purifier
PUMP
EXHAUST
GAS
OUTLET
Filter
NO
2
Converter
BYPASS
MANIFOLD
SAMPLE
GAS
INLET
ZERO GAS
INLET
SPAN
GAS
INLET
EXHAUST MANIFOLD
O
2
Sensor
SAMPLE/ CAL
VALVE
ZERO/SPAN
VALVE
REACTION
CELL
Orifice Dia.
0.003"
Orifice Dia.
0.007"
Orifice Dia.
0.004"
Orifice Dia.
0.004"
NO
X
Exhaust
Scrubber
Figure 11-14: M200EM – Internal Gas Flow With OPT 50 + OPT 65
11.2.3. ZERO OR LOW FLOW PROBLEMS
11.2.3.1. Sample Flow is Zero or Low
The M200EH/EM does not actually measure the sample flow but rather calculates it from a differential pressure
between sample and vacuum manifold. On flow failure, the unit will display a
SAMPLE FLOW WARNING on
the front panel display and the respective test function reports
XXXX instead of a value “0”. This message
applies to both a flow rate of zero as well as a flow that is outside the standard range (200-600 cm³/min; 300-700
cm³/min with O
2
option installed).
If the analyzer displays
XXXX for the sample flow, confirm that the external sample pump is operating and
configured for the proper AC voltage. Whereas the M200EH/EM can be internally configured for two different
power regimes (100-120 V and 220-240 V, either 50 or 60 Hz), the external pump is physically different for each
of three power regimes (100 V / 50 Hz, 115 V / 60 Hz and 230 V / 50 Hz). If the pump is not running, use an AC
Voltmeter to make sure that the pump is supplied with the proper AC power. If AC power is supplied properly,
but the pump is not running, replace the pump.
NOTE
Sample and vacuum pressures mentioned in this chapter refer to operation of the
analyzer at sea level. Pressure values need to be adjusted for elevated locations, as the
ambient pressure decreases by about 1 in-Hg per 300 m / 1000 ft.
If the pump is operating but the unit reports a XXXX gas flow, do the following three steps:
04521C (DCN5731)