Detcon FP-100 - Manual (Page 22)

Model FP-100
FP-100 Instruction Manual Rev. 0.0 Page 18 of 30
4. Service and Maintenance
Calibration Frequency
In most applications, quarterly to biannual zero and span calibration intervals will assure reliable detection.
However, industrial environments differ. Upon initial installation and commissioning, close frequency tests
should be performed, weekly to monthly. Test results should be recorded and reviewed to determine a suitable
calibration interval.
Visual Inspection
The Sensor should be inspected annually:
™
Inspect the sensor for signs of corrosion, pitting, and water damage.
™ Remove the Splash Guard and inspected it for blockage, broken, cracked, or missing pieces.
™ Inspect the flame arrestor on the Bottom Housing for corrosion or blockage.
™ Inspect inside of the Junction Box for signs of water accumulation, signs of corrosion.
™ Check wiring to ensure there are no loose or pinched wires and all connections are clean and tight.
Condensation Prevention Packet
A moisture condensation packet should be installed in every explosion proof Junction Box. The moisture
condensation prevention packet will prevent the internal volume of the J-Box from condensing and
accumulating moisture due to day-night humidity changes. This packet provides a critical function and should
be replaced annually. Detcon’s PN is 960-202200-000.
4.1 Replacement of Plug-in Sensor
NOTE: It is necessary to remove power while changing the plug-in sensor in order to maintain
area classification, since the Plug-In Sensor is not intrinsically safe.
NOTE: Only replace the FP-100 plug-in sensor with an authorized FP-100 plug-in Sensor.
1. Use a 1/8” Allen wrench to release the locking cap head screw that locks the ITM and Bottom
Housing together (One turn will suffice - Do not remove cap head screw completely).
2. Unthread and remove the Bottom Housing and Splash Guard from the ITM.
3. Gently pull the plug-in sensor out of the ITM. Orient the new plug-in sensor so that it matches with
the female connector pins. Use the alignment marks provided to assure alignment is correct. When
properly aligned, press the sensor in firmly to make the proper connection.
4. Thread the Bottom Housing onto the ITM to a snug fit and tighten the locking cap head screw using
the 1/8” Allen wrench. Reinstall the Splash Guard.
5. Check and perform zero calibration and span calibration as per Section 3.2 Calibration.
4.2 Replacement of ITM
1. If the sensor has the 100 Series Display option installed, unplug the display from the terminal board by
pulling the display out of the junction box. The display option plugs directly into the terminal board’s
Beau Connector.