Справочник Пользователя для Teledyne gfc 7000ta

 

Teledyne Analytical Instruments 

222 

Time of day clock is too fast or slow: To adjust See Section 6.6. 
Battery in clock chip on CPU board may be dead. 

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. 

Indicates noise level of instrument or CO

2

 concentration of sample gas (See Section 10.4.2 for causes). 

If the value displayed is too high the IR Source has become brighter.  Adjust the variable gain 
potentiometer on the sync/demod board 
If the value displayed is too low or constantly changing and the CO

 is OK: 

o

  Failed multiplexer on the mother board 

o

  Failed sync/demod board 

o

  Loose connector or wiring on sync/demod board 

Flow of purge gas to the GFC wheel housing may have stopped 

If the value displayed is too low or constantly changing and the CO

 is BAD: 

o

  GFC wheel stopped or rotation is too slow 

o

  Failed sync/demod board IR source 

o

  Failed IR source 

o

  Failed relay board 

o

 Failed 

I

2

C

 bus 

o

  Failed IR photo-detector 

When the analyzer is sampling zero air and the ratio is too low: 

o

  The reference cell of the GFC wheel is contaminated or leaking. 

o

  The alignment between the GFC wheel and the segment sensor, the M/R sensor or both is 

incorrect. 

o

  Failed sync/demod board 

o

  Flow of purge gas to the GFC wheel housing may have stopped 

When the analyzer is sampling zero air and the ratio is too high: 

o

  Zero air is contaminated 

o

  Failed IR photo-detector 

See Table 11-1 for SAMPLE PRES WARN 

Check for gas flow problems.  see Section 11.1.6 

 should be close to BENCH TEMP.  Temperatures outside of the specified range or 

oscillating temperatures are cause for concern 

Bench temp control improves instrument noise, stability and drift.  Temperatures outside of the specified 
range or oscillating temperatures are cause for concern.  See Table 11-1 for BENCH TEMP WARNING 

Wheel temp control improves instrument noise, stability and drift.  Outside of set point or oscillating 
temperatures are cause for concern.  See Table 11-1 for WHEEL TEMP WARNING 

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 11-1 for BOX TEMP WARNING. 

If this drive voltage is out of range it may indicate one of several problems: 
 - A poor mechanical connection between the various components in inside the detector housing 
 - An electronic failure of the IR Photo-Detector’s built-in cooling circuitry, or; 
 - A temperature problem inside the analyzer chassis.  In this case other temperature warnings would also 
be active such as BENCH TEMP WARNING or BOX TEMP WARNING.