Detcon FP-624D-HT - Manual (Page 17)

Model FP-624D-HT
FP-624D-HT Instruction Manual Rev. 1.1 Page 13 of 44
-Detcon PN 600-610000-000 Splash Guard with integral Cal Port -OR-
-Detcon PN 943-000006-038 Threaded Calibration Adapter
- Detcon PN 942-520124-050 Span Gas; 50% LEL methane/balance Air at fixed flow rate of 200-500cc/min.
NOTE: Do not use calibration gases in Nitrogen background gas mixtures. This will cause
significant reading inaccuracies.
a) Attach the calibration adapter to the threaded sensor housing. Apply the test gas at a controlled flow rate
of 200 - 500cc/min (200cc/min is the recommended flow). Allow 1-2 minutes for the reading to stabilize.
Observe that during the 1-2 minutes the display increases to a level near that of the applied calibration gas
value.
b) Remove test gas and observe that the display decreases to “0”.
Initial operational tests are complete. Detcon High Temperature combustible 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 span
calibration instructions in Section 3.4.