Detcon DM-700 - Manual (Page 16)

Model DM-700
DM-700 Instruction Manual Rev. 4.0 Page 12 of 48
a) Attach the calibration adapter to the threaded sensor housing or connect tubing to integral cal port. Apply
the test gas at a controlled flow rate of 200 - 500cc/min (500cc/min is the recommended flow). Observe
that the ITM display increases to a level near that of the applied calibration gas value.
b) Remove test gas and observe that the ITM display decreases to “0”.
Initial operational tests are complete. DM-700 toxic gas sensors are factory calibrated prior to shipment, and
should not require significant adjustment on start up. However, it is recommended that a complete calibration
test and adjustment be performed 16 to 24 hours after power-up.
Refer to zero and span calibration
instructions in Section 3.4.
2.7.2 O
2
Deficiency Sensors
a) DM-700 display reads close to 20.9% and no fault messages are flashing.
b) The reading should stabilize within 1 to 2 minutes of power-up (assuming a ‘normal’ ambient O
2
concentration).
Initial Operational Tests
After a warm-up period of 5 minutes the sensor should be checked to verify response to O
2
deficiency.
Material Requirements
 Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port -OR-
 Detcon PN 943-000006-132 Threaded Calibration Adapter
 Detcon Zero Gas: 100% N2 at fixed flow rate of 200-500cc/min
a) Attach the calibration adapter to the threaded sensor housing or connect tubing to the integral cal port.
Apply the test gas at a controlled flow rate of 200-500cc/min (500cc/min is the recommended flow).
Observe that the ITM display decreases to a level near zero.
b) Remove test gas and calibration adapter. The ITM display should return to a reading of 20.9%.
Initial operational tests are complete. DM-700 O
2
deficiency sensors are factory calibrated prior to shipment,
and should not require significant adjustment on start up. However, it is recommended that a complete
calibration test and adjustment be performed 16 to 24 hours after power-up. Refer to zero and span calibration
instructions in Section 3.4.