Table 5-4. Dashboard Functions - Indicated Failures - Teledyne T400 User Manual

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)
Incorrectly configured measurement range(s) could cause response problems with a Data logger or chart
recorder attached to one of the analog output.
RANGE
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.
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.
O3 MEAS
&
If the value displayed is constantly changing:
O3 REF
• Bad UV lamp.
• Defective UV lamp power supply.
• Failed I
If the O Ref value changes by more than 10mV between zero and span gas:
3
•
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).
SAMPLE TEMP should be close to BENCH TEMP. Temperatures outside of the specified range or oscillating
SAMP TEMP
temperatures are cause for concern.
PHOTO
Bench temp control improves instrument noise, stability and drift. Temperatures outside of the specified range
LAMP
or oscillating temperatures are cause for concern. Table 5-3 for PHOTO TEMP WARNING.
If the box temperature is out of range, check fan in the power supply module. Areas to the side and rear of
BOX TEMP
instrument should allow adequate ventilation. See Table 5-3 for BOX TEMP WARNING.
O3 GEN
If the O Generator Temperature is out of range, check the O
3
TEMP
Table 5-3 for O3 GEN TEMP WARNING
Values outside range indicate
Contamination of the zero air or span gas supply
Instrument is miscalibrated
SLOPE
Blocked gas flow
Faulty sample pressure sensor (P1) or circuitry
Bad/incorrect span gas concentration.
Values outside range indicate
OFFSET
Contamination of the zero air supply
083730400A DCN8130
2 C Bus.
Teledyne API – Model T400 O
INDICATED FAILURE(S)
Generator heater and temperature sensor. See
3
Analyzer
3
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