Model FP-700
FP-700 Instruction Manual Rev. 5.1 Page 14 of 46
Upon completion of all mechanical mounting and termination of all field wiring, apply system power in the
range of 11.5-30VDC (24VDC typical) and observe the following normal conditions:
a) FP-700 display reads “0”, and no fault messages are flashing.
b) A temporary upscale reading may occur as the sensor heats up. This upscale reading will decrease to 0ppm
within 1-2 minutes of power-up, assuming there is no combustible gas in the area of the sensor.
NOTE: The 4-20mA signal is held constant at 4mA for the first two minutes after power up.
Initial Operational Tests
After a warm up period of 1 hour, the sensor should be checked to verify sensitivity to combustible gas.
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 PN 942-520124-050 Span Gas; 50% LEL methane/balance Air at fixed flow rate of 200-
500cc/min (use with 0-100% LEL range).
• Detcon PN 942-520124-025 Span Gas; 25% LEL methane/balance Air at fixed flow rate of 200-
500cc/min (use with 0-50% LEL range).
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 ITM display increases to a level near that of the applied calibration
gas value.
NOTE: Check response time by confirming that the reading comes onto scale in first 5 seconds and reaches
approximately 50% of the applied gas within 10-15 seconds and reaches approximately 90% of the applied gas
in 30-40 seconds.
b) Remove test gas and observe that the ITM display decreases to “0”.
Initial operational tests are complete. Detcon FP-700 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 zero and span calibration
instructions in Section 3.4.Operation
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