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Model TS420
iii
Periodic Testing/Calibration of Field Devices
Periodic testing/calibrating should be performed per the manufacturers’ recommendations and
instructions. Testing/Calibrating procedures should include, but not be limited to:
! Verify zero reading
! Apply a known concentration of gas, or a simulated test device provided by the
manufacturer
! Verify integrity of all optical surfaces and devices
! For flame detectors, use the appropriate test lamp
When testing produces results outside of the manufacturers’ specifications, re-calibration or
repair/replacement of the suspect device(s) should be performed as necessary. Calibration
intervals should be independently established through a documented procedure, including a
calibration log maintained by plant personnel or third party testing services.
Periodic System Verification
The following system verifications should be performed at least annually:
Verify wiring, terminal connections and stability of mounting for all integral safety equipment
including, but not limited to:
! Power supplies
! Control modules
! Field detection devices
! Signaling / output devices
! Accessories connected to field and signaling devices
Proper system operation should be verified by performing a full, functional test of all component
devices of the safety system, ensuring that the proper levels of alarming occur.
Fault/Malfunction circuit operation should be verified.