Teledyne 6200E - Sulfides Analyzer - Manual (Page 243)

Model 6200E Instruction Manual TROUBLESHOOTING & REPAIR
M6200E Rev: A1 243
Table 11-2: Test Functions - Possible Causes for Out-Of-Range Values
TEST FUNCTION INDICATED FAILURE(S)
H2S STB 1 Unstable concentrations; leaks
SAMPLE FL Leaks; clogged critical flow orifice
PMT Calibration error; HVPS problem; PMT problem; No flow (leaks)
NORM PMT Calibration error; HVPS problem; PMT problem
AZERO Leaks; malfunctioning AutoZero valve
HVPS HVPS broken; preamp board circuit problems
RCELL TEMP
Malfunctioning heater; relay board communication (I 2 C bus); relay
burnt out
BOX TEMP
Environment out of temperature operating range; broken
thermistor; runaway heater
PMT TEMP
TEC cooling circuit broken; High chassis temperature; 12V power
supply
IZS TEMP
(OPTION)
Malfunctioning heater; relay board communication (I 2 C bus); relay
burnt out
CONV TEMP
Malfunctioning heater or temperature sensor; relay board
communication (I 2 C bus); relay burnt out
PRESS (RX CELL
PRESSURE)
Leak; malfunctioning valve; malfunctioning pump; clogged flow
orifices; sample inlet overpressure;
H2S SLOPE 1
Calibration error; span gas concentration incorrect; leaks; low lamp
output
H2S OFFS 1
Incorrect span gas concentration/contaminated zero air/leak; low-
level calibration off
TIME OF DAY
Internal clock drifting; move across time zones; daylight savings
time?
1 Shown as they appear when analyzer is in H
2
S mode. In SO
2
mode appear as SO2 STB,
SO2 OFFS & SO2 SLOPE. In multigas mode, both versions appear.
11.1.3. Using the Diagnostic Signal I/O Function
The signal I/O parameters found under the diagnostics (DIAG) menu combined with a thorough
understanding of the instrument’s theory of operation (Section 10) are useful for troubleshooting
in three ways:
• The technician can view the raw, unprocessed signal level of the analyzer’s critical inputs
and outputs.
• All of the components and functions that are normally under instrument control can be
manually changed.
• Analog and digital output signals can be manually controlled.
This allows the user to systematically observe the effect of these functions on the operation of
the analyzer.
Figure 11-2 shows an example of how to use the signal I/O menu to view the raw voltage of an
input signal or to control the state of an output voltage or control signal. The specific parameter
will vary depending on the situation. Please note that the analyzer will freeze it’s concentration