Detcon PI-600 - Manual (Page 31)

a) First, enter the programming menu by holding the programming magnet stationary over “PGM 2” for 30 seconds
until the display reads “VIEW PROG STATUS”, then withdraw the magnet. At this point you can scroll
through the programming menu by momentarily waving the programming magnet over “PGM 1” or “PGM 2”. The
menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2 Level, and Set Cal Level.
b) ALARM 1 LEVEL From the programming menu scroll to the alarm 1 level listing. The menu item appears as:
“SET ALARM 1 LEVEL”. Enter the menu by holding the programming magnet stationary over “PGM 1” for 3
seconds until the display reads
“SET ALM1 @ ##PPM”, then withdraw the magnet. Use the programming mag-
net to make an adjustment to “PGM 1” to increase or “PGM 2” to decrease the display reading until the reading is
equal to the desired alarm set point. Exit to the programming menu by holding the programming magnet over
“PGM1” for 3 seconds, or automatically return to the programming menu in 30 seconds.
c) ALARM 2 LEVEL From the programming menu scroll to the alarm 2 level listing. The menu item appears as:
“SET ALARM 2 LEVEL”. Enter the menu by holding the programming magnet stationary over “PGM 1” for 3
seconds until the display reads
“SET ALM2 @ ##PPM”, then withdraw the magnet. Use the programming mag-
net to make an adjustment to “PGM 1” to increase or “PGM 2” to decrease the display reading until the reading is
equal to the desired alarm set point. Exit to the programming menu by holding the programming magnet over
“PGM1” for 3 seconds, or automatically return to the programming menu in 30 seconds.
d) 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.
3.10.2 Alarm Reset
An alarm condition will cause the applicable alarm to activate its corresponding relay and LED. If alarm 1, alarm 2, or
fault alarms have been programmed for latching relays, an alarm reset function must be activated to reset the alarms
after an alarm condition has cleared. To reset the alarms, simply wave the programming magnet over either “PGM 1” or
“PGM 2”, momentarily, while in normal operations mode and note that the corresponding alarm LED(s) turn off.
3.10.3 Other Alarm Functions
Alarms are factory programmed to be non-latching, de-energized; and to f ire under ascending gas conditions. The fault
alarm relay is programmed as normally energized which is useful for detecting a 24VDC power source failure.
All alarm functions are programmable via jumper tabs. Changing alarm functions requires the sensor housing to be
opened, thus declassif ication of the area is required. See section 3.4.4 for details.
3.11 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
PI-600 Toxic Gas Sensors PG.31