Detcon DM-600IS - Manual (Page 25)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 21 of 37
If this characteristic is problematic for your specific application, a battery backup or uninterruptible power
supply is recommended.
NOTE 3: All alarms will be disabled for 1 minute after power up. In the event of power failure,
the alarm disable periods will begin again once power has been restored. If using a biased cell
(see note 2 above), this 1 minute delay may likely be inadequate for the signal to clear below
alarm levels so manually disabling alarms is advised.
6.1 Initial Operational Tests
After a warm up period has been allowed for, the sensor should be checked to verify sensitivity to its target
gas.
Material Requirements
 Detcon PN 943-000006-132 Calibration Adapter
 Span gas containing the target gas in air or nitrogen. It is recommended that the target gas
concentration be 50% of scale at a controlled flow rate of 500 ml/min. For example, a Model DM-
600IS-H2S sensor in the range 0-100ppm would require a test gas of 50ppm H2S. For a sensor with a
range of 0-10ppm a test gas of 5ppm is recommended, etc.
a) Attach the calibration adapter to the sensor housing. Apply the test gas at a controlled flow rate of 500
ml/m. Observe that the LCD display increases to a level of 20% of range or higher.
b) Remove the test gas and observe that the LCD display decreases to “0 PPM”.
c) If alarms are activated during the test, and have been programmed for latching operation, reset them
according to the instructions in section 11.2.
Initial operational tests are complete. Detcon toxic gas sensors are pre-calibrated prior to shipment and will, in
most cases, not require significant adjustment on start up. However, it is recommended that a complete
calibration test and adjustment be performed within 24 hours of installation. Refer to calibration instructions in
section 9.0.
7.0 OPERATING SOFTWARE & MAGNETIC
INTERFACE
Operating software is menu listed with operator interface via the two magnetic program switches located under
the face plate. The two switches are referred to as “PGM 1” and “PGM 2”. The menu list consists of 3 items
which include sub-menus as indicated below. (Note: see section 8.0 for a complete software flow chart.)
1) Normal Operation
a) Current Status
1) Calibration Mode
a) Zero
b) Span
1) Program Menu
a) View Program Status
b) Alarm 1 Level
c) Alarm 2 Level
d) Set Calibration Level