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083730400A DCN8130
Teledyne API – Model T400 O
3
Analyzer
117
The following table contains some of the more common causes for these values to be out
of range.
Table 5-4. Dashboard Functions - Indicated Failures
FUNCTIONS
(
AS DISPLAYED)
INDICATED FAILURE(S)
RANGE
Incorrectly configured measurement range(s) could cause response problems with a Data logger or chart
recorder attached to one of the analog output.
If the Range selected is too small, the recording device will over range.
If the Range is too big, the device will show minimal or no apparent change in readings.
STABIL
Indicates noise level of instrument or concentration of sample gas.
O3 MEAS
&
O3 REF
If the value displayed is too high the UV Source has become brighter. Adjust the variable gain potentiometer on
the UV Preamp Board in the optical bench.
If the value displayed is too low:
•
< 100mV – Bad UV lamp or UV lamp power supply.
•
< 2000mV – Lamp output has dropped, adjust UV Preamp Board or replace lamp.
If the value displayed is constantly changing:
•
Bad UV lamp.
•
Defective UV lamp power supply.
•
Failed I
2
C Bus.
If the O
3
Ref value changes by more than 10mV between zero and span gas:
•
Defective/leaking switching valve.
PRES
See Table 5-3 for SAMPLE PRES WARN.
SAMPLE FL
Check for gas flow problems (see Section 5.7.5).
SAMP TEMP
SAMPLE TEMP should be close to BENCH TEMP. Temperatures outside of the specified range or oscillating
temperatures are cause for concern.
PHOTO
LAMP
Bench temp control improves instrument noise, stability and drift. Temperatures outside of the specified range
or oscillating temperatures are cause for concern. Table 5-3 for PHOTO TEMP WARNING.
BOX TEMP
If the box temperature is out of range, check fan in the power supply module. Areas to the side and rear of
instrument should allow adequate ventilation. See Table 5-3 for BOX TEMP WARNING.
O3 GEN
TEMP
If the O
3
Generator Temperature is out of range, check the O
3
Generator heater and temperature sensor. See
Table 5-3 for O3 GEN TEMP WARNING
SLOPE
Values outside range indicate
Contamination of the zero air or span gas supply
Instrument is miscalibrated
Blocked gas flow
Faulty sample pressure sensor (P1) or circuitry
Bad/incorrect span gas concentration.
OFFSET
Values outside range indicate
Contamination of the zero air supply
Содержание T400
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