Teledyne 200AH 用户手册

 

Many of the TEST functions have an analog voltage associated with them. As a diagnostic aid it 
is possible to route the various test voltages out the 4th analog output port. Details on using the 
test channel analog output are in the Troubleshooting Section. 

PMT 
DETECTOR 

0 mV 

5000 mV 

PMT detector output from the preamp. This 
signal has been amplified and filtered. Since the 
instrument is switched and uses AutoZero, 
normal values can vary from -100 to 5000 mV. 
Wide variations in this signal are normal. 
Values should be around 0 mV when sampling 
zero air. 

OZONE FLOW 

0 cc/min 

1000 cc/min 

This signal is the output from the ozone 
flowmeter. Values around 1150 mV indicate 
zero flow. Typical values for 80 cc/min ozone 
flow are around 1800 mV. Voltage should be 
steady, indicating stable flow. 

SAMPLE 
FLOW 

0 cc/min 

1000 cc/min 

The sample flow is calculated from the 
upstream pressure as measured by the 
SAMPLE PRESSURE transducer.  

SAMPLE 
PRESSURE 

0" Hg-Abs 

40"-Hg-Abs 

The sample pressure is measured by an absolute 
pressure meter. The absolute pressure at sea 
level is 29.92"-Hg. The exact reading will vary 
a few tenths due to passing weather fronts and 
daily temperature cycling. The reading will 
decrease about 1"-Hg with each 1000 ft gain in 
altitude. For example, the absolute pressure at 
10,000-ft (3000 m) is about 20"-Hg-A.  A 
typical value near sea level would be about 
4200 mV. 

RCELL 
PRESSURE 

0" Hg-Abs 

40"-Hg-Abs 

Like the SAMPLE PRESSURE the RCELL 
pressure is an absolute pressure measurement. 
With the sample pump off, it should read about 
atmospheric pressure. With the pump 
operating, a typical value is 1300 mV for about 
5"-Hg-A reaction cell pressure.