Teledyne 9110AH Instruction Manual page 52

TELEDYNE Model 9110AH NO
Sample Flow (SAMP FLW)
The SAMPLE FLOW test function is computed from the pressure measured up-stream of the
sample flow orifice. The pressure down-stream of the orifice is also checked to assure the
assumptions of the equation are valid. This will register variations in flow caused by changes in
atmospheric pressure, but will not detect a plugged sample flow orifice. The sample flow into
the reaction cell is 50
reports a flow of 290
Ozone Flow (OZONE FLW)
The OZONE FLOW test function is directly measured by a solid state flow meter. Variations in
this value indicate variations in ozone flow. The nominal value for ozone flow is 250
10 cc/min.
PMT Voltage (PMT)
The PMT VOLTAGE measures the PMT signal at the output of the preamp board. The
waveform of the PMT voltage can be complex, and vary from near 0 mV when zero gas is in
the reaction cell to 5000 mV when there is large amounts of NO being measured. If the PMT
reading is consistently 5000 mV, that indicates an off-scale reading. Typical readings bounce
around, which is normal.
AutoZero Voltage (AZERO)
The AutoZero Voltage is the PMT output when the AutoZero valve is actuated. It provides a
zero reference which is subtracted from all NO and NO
near
0 mV. Readings in the range –10 to +50 mV are acceptable. High readings indicate a light leak
in the reaction cell, recent exposure of the PMT to light, or contamination in the reaction cell.
High Voltage Power Supply Voltage (HVPS)
The HVPS reading is a measure of the scaled-up HVPS programming voltage. The voltage used
to set the HVPS output is generated on the Preamp board. Its value is between 0 and 1 volt,
corresponding to a voltage of 0 to 1000 volts out of the HVPS. The HVPS front panel TEST
measurement should typically be in the range of 400-600V.
DC Power Supply Voltage (DCPS)
The DCPS voltage is a composite of the 5 and
This is meant to be a quick indicator to show if the PSM is working correctly. The nominal
value is 2500 mV
Analyzer Operator Manual, 01620, Rev. F
X
10 cc/min with a bypass flow of 250 cc/min
50 cc/min.
200 mV.
5-10
50. The instrument
readings. The value typically will be
x
15 VDC voltages in the Power Supply Module.