MERIDIAN
UNIVERSAL GAS DETECTOR
SAFETY INTEGRATION LEVEL (SIL-2) INFORMATION
C-2
USE AND DISCLOSURE OF DATA
Information contained herein is classified as EAR99 under the U.S. Export Administration Regulations. Export, reexport or diversion contrary to U.S. law is
prohibited.
C.2. Proof Test Procedure
The SIL safety parameters presented in this manual assume an annual safety function proof test of the device to
detect failure modes not detectable by built in diagnostic functions. Failure to perform an annual proof test invali
-
dates the safety performance parameters presented herein.
Tools Required:
• 3mm (TBR) hex wrench
• Standard calibration gas
• Calibration gas (sufficient concentration to activate highest alarm level)
• Calibration adapter
• DVM multi-meter
Procedure:
1. Bypass final element safety function to prevent inadvertent activation of safety shutdown systems (i.e. deluge/
suppression/evacuation systems).
2. Using the hex wrench, loosen the setscrew securing the Meridian end cap assembly to the sensor housing.
3. Remove the Meridian end cap assembly.
4. Remove the sensor assembly from the sensor housing.
A. Verify the fault relay (K4) deactivates (normally open)
B. Verify the fault 4-20mA signal is transmitted to the receiving element of the safety system.
5. Reinstall the sensor.
6. Install the Meridian end cap and secure it with the setscrew.
7. Cycle the power or perform a power on reset of the transmitter and wait for the sensor warm up time to expire
WARNING:
THIS TEST DISABLES HAZARDOUS CONDITION MONITORING. PERFORM
THIS TEST ONLY WHEN YOU KNOW CONDITIONS ARE SAFE (I.E. UNIT SHUTDOWN/
TURN AROUND). USE ALTERNATIVE MONITORING FOR HAZARDOUS CONDITIONS
THROUGHOUT THIS TESTING. FAILURE TO DO SO COULD RESULT IN INJURY OR DEATH.
NOTE: Verification of the safety function requires adjustment of the fault current to something other
than 4mA for proper verification.
CAUTION:
The Meridian end cap protects the device from ingress from water or dust. Always install
the Meridian end cap prior to operation. Use only Meridian end cap P/N 096-3437-1 or 096-3437-
2 with mesh screen or 096-3437-3 or 096-3437-4 without mesh screen.
