Detcon PI-500 - Manual (Page 28)

1 - The software version number.
2 - Range is ###.
3 - Calibration gas level setting. The menu item appears as: “CalLevel @ xxPPM”
4 - Response Factor Setting. The menu item appears as: “RespFactor = x.xx”
5 - Zero Offset Setting. The menu item appears as: “ZeroOffset = x.x”
6 - Raw signal from sensor head. The menu item appears as: “RawSignal = x.xxV”
7 - The estimated remaining sensor life. The menu item appears as: “SENSOR LIFE 100%”
c) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or automatically
return to normal operation in 30 seconds.
3.10 P
ROGRAM
F
EATURES
Detcon MicroSafe™ PID gas sensors incorporate a comprehensive program to accommodate easy operator interface
and fail-safe operation. Program features are detailed in this section. Each sensor is factory tested, programmed, and cali-
brated prior to shipment.
Over Range
When the sensor detects gas greater than 100% of range, it will cause the display to f lash the highest reading of its range on
and off.
Under Range Fault(s)
If the sensor should drift below a zero baseline of -10% of range, the display will indicate a fault: “ZERO FAULT” .
This is typically f ixed by performing another zero cal. When the total negative zero drift exceeds the acceptable thresh-
old the display will indicate “SENSOR FAULT” and you will longer be able to zero calibrate.
Span Fault #1
If during span calibration the sensor circuitry is unable to attain a minimum defined response to span gas, the sensor will
enter into the calibration fault mode and cause the display to alternate between the sensor’s current status reading and the
calibration fault screen which appears as: “SPAN FAULT #1”. The previous calibration settings will remain saved in
memory. Previous span calibration is retained.
Span Fault #2
If during the span routine, the sensor circuitry is unable to attain a minimum defined stabilization point, the sensor will
enter into the calibration fault mode and cause the display to alternate between the sensor’s current status reading and the
calibration fault screen which appears as “SPAN FAULT #2”. Previous span calibration is retained.
Memory Fault
If new data points cannot successfully be stored to memory the display will indicate: “MEMORY FAULT”.
Fail-Safe/Fault Supervision
Detcon MicroSafe™ sensors are programmed for fail-safe operation. All fault conditions will illuminate the fault LED,
and cause the display to read its corresponding fault condition: “ZERO FAULT” , “SENSOR FAULT”, “SPAN
FAULT #1”, or “SPAN FAULT #2” . A “SENSOR FAULT” and “ZERO FAULT” will cause the mA output to
drop to zero (0) mA.
Sensor Life
The “Sensor Life” feature gauges the remaining sensor life based on signal output from the PID sensor cell. When a sen-
sor life of 25% or less remains, the sensor cell should be replaced within a reasonable maintenance schedule.
3.11 D
ISPLAY
C
ONTRAST
A
DJUST
Detcon MicroSafe™ sensors feature a 16 character backlit liquid crystal display. Like most LCDs, character contrast can
be affected by viewing angle and temperature. Temperature compensation circuitry included in the MicroSafe™ design
will compensate for this characteristic, however temperature extremes may still cause a shift in the contrast. Display con-
trast can be adjusted by the user if necessary. However, changing the contrast requires that the sensor housing be
opened, thus declassif ication of the area is required.
PI-500 Toxic Gas Sensors PG.28