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Troubleshooting & Service 
Teledyne API  - T100 UV Fluorescence SO2 Analyzer  
238 
Table 12-1: 
Warning Messages - Indicated Failures 
Warning Message 
Fault Condition 
Possible Causes 
ANALOG CAL 
WARNING 
The instruments A/D 
circuitry or one of its analog 
outputs is not calibrated 
 A parameter for one of the analog outputs, even one not currently being used,  
has been changed and the analog output calibration routine was not re-run 
A/D circuitry failure on motherboard 
Other motherboard electronic failure 
BOX TEMP WARNING 
Box Temp is < 5°C or > 
48°C. 
NOTE: Box temperature typically runs ~7
o
c warmer than ambient temperature.   
Poor/blocked ventilation to the analyzer. 
Stopped exhaust-fan 
Ambient temperature outside of specified range  
CANNOT DYN SPAN 
Dynamic Span operation 
failed 
Measured concentration value is too high or low. 
Concentration slope value too high or too low 
CANNOT DYN ZERO 
Dynamic Zero operation 
failed 
Measured concentration value is too high. 
Concentration offset value too high. 
CONFIG INITIALIZED 
Configuration and 
Calibration data reset to 
original Factory state. 
Failed disk on module 
User erased data 
DARK CAL WARNING 
The Dark Cal signal is 
higher than 200 mV. 
Light leak in reaction cell 
Shutter solenoid is not functioning 
Failed relay board 
I
2
C bus failure  
Loose connector/wiring 
PMT preamp board bad or out of cal 
DATA INITIALIZED 
Data Storage in DAS was 
erased 
Failed disk on module 
User cleared data 
HVPS WARNING 
High voltage power supply 
output is <400 V or >900 V 
High voltage power supply is bad 
High voltage power supply is out of cal 
A/D converter circuitry is bad 
IZS TEMP WARNING 
On units with IZS options 
installed: The permeation 
tube temperature is Sample 
chamber temperature is 
< 45°C or > 55°C 
Bad IZS heater  
Bad IZS temperature sensor 
Bad relay controlling the IZS heater 
Entire relay board is malfunctioning 
I
2
C bus malfunction 
Failure of thermistor interface circuitry on motherboard 
PMT DET WARNING 
PMT detector output is > 
4995 mV 
Failed PMT 
Malfunctioning PMR preamp board 
A/D converter circuitry failure 
PMT TEMP WARNING 
PMT temperature is  
< 2°C or > 12°C 
Bad PMT thermo-electric cooler 
Failed PMT TEC driver circuit 
Bad PMT preamp board 
Failed PMT temperature sensor 
Loose wiring between PMT temperature sensor and PMT Preamp board 
Malfunction of analog sensor input circuitry on motherboard 
RCELL TEMP 
WARNING 
Sample chamber 
temperature is  
< 45°C or > 55°C 
Bad reaction cell heater  
Bad reaction cell temperature sensor 
Bad relay controlling the reaction cell heater 
Entire relay board is malfunctioning 
I
2
C bus malfunction 
REAR BOARD NOT 
DET 
Mother Board not detected 
on power up. 
Warning only appears on serial I/O COMM port(s) 
Front panel display will be frozen, blank or will not respond. 
Massive failure of mother board. 
SAMPLE FLOW WARN 
Sample flow rate is < 500 
cc/min or > 1000 cc/min. 
Failed sample pump 
Blocked sample inlet/gas line 
Dirty particulate filter 
Leak downstream of critical flow orifice 
Failed flow sensor/circuitry 
SAMPLE PRES WARN 
Sample Pressure is <10 in-
Hg or 
 > 35 in-Hg
1
 
If sample pressure is < 10 in-hg: 
o
  Blocked particulate filter 
o
  Blocked sample inlet/gas line 
o
  Failed pressure sensor/circuitry 
If sample pressure is > 35 in-hg: 
o
  Blocked vent line on pressurized sample/zero/span gas supply 
o
  Bad pressure sensor/circuitry 
06807C DCN6650