Flow Problems; Sample Flow Is Zero Or Low - Teledyne T200 User Manual

F P
LOW
The analyzer has two main flow paths, the sample flow and the flow of the ozone supply
air. With IZS or zero/span valve option installed, there is a third (zero air) and a fourth
(span gas) flow path, but either one of those is only controlled by critical flow orifices and
not displayed on the front panel or stored to the DAS.
In the two main flow paths, flow problems occur in the following three ways:
Flow is zero or low
•
• Flow is too high
Flow is greater than zero, but is too low, and/or unstable
•
When troubleshooting flow problems, it is essential to confirm the actual flow rate without
relying on the analyzer's flow display. The use of an independent, external flow meter to
perform a flow check as described in Section 5.6.11.3 is essential. Refer to the pneumatic
flow diagrams as needed for reference.

SAMPLE FLOW IS ZERO OR LOW

The analyzer 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 in the Active Alerts page and the respective
function reports nothing instead of a numerical value. This message applies to both a flow
rate of zero as well as a flow that is outside the standard range (350-600 cc/min).
If the analyzer displays nothing for the sample flow, confirm that the external sample pump
is operating and configured for the proper AC voltage.
Whereas the analyzer 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 ensure 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
If the pump is operating but the unit is not reporting gas flow value, take the following
three steps:
1. Check for actual sample flow.
•
083730200A DCN7962
ROBLEMS
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.
To check the actual sample flow, disconnect the sample tube from the
sample inlet on the rear panel of the instrument.
Teledyne API T200 NO/NO /NO Analyzer with NumaView™ Software
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