Chapter 7 - Maintenance and Calibration Procedures
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7.
Ensuring only high temperature vacuum grease (Dow Corning) is used when mounting
the sensors to their respective locations
8. The sensor can be tightened with the knurled thumbscrew ¼ turn past finger tight. Do
not over tighten knurled thumbscrew as this can crack and damage sensor
NOTE: If any sensor is damaged or not functioning the complete UltraSonic assembly
must be replaced
9.
If the alarm will not clear, move the sensor vertically (up or down) approximately ±0.5” on
the stainless steel tubing to avoid being installed on rough surface. Retighten on a
surface of the tubing that is free of all welds or bent surface
10. Log into the controller. Check the status of all of the ultrasonic sensors on the Main
Display, refer to UltraSonic Liquid Detector test in this section.
Note: If the signal toggles from OPEN to CLOSED, even briefly, the vacuum grease
should be replaced on the applicable sensor.
7.2.6 Sierra Vapor Detector Verification / Calibration (System Requirement)
This procedure is used to verify/calibrate the detection limit of the Sierra Vapor Detector.
Failure to perform this calibration may fail to detect sensor drift over time, resulting in
inaccurate response of the Vapor Detector. This inaccuracy can manifest itself as over-
sensitivity (causing the alarm to be triggered when no vapors are present), or as insensitivity
(causing no alarm when vapors are present). Drift is not predictable and may vary in direction
and magnitude from system to system and may change as the Vapor Detectors age.
The Vapor Detector should be verified / calibrated every twelve (12) months, or when exhaust
flow over an interval changes. The user should be familiar with the operation and calibration
of the Vapor Detector prior to servicing the detector.
NOTE
:
Before conducting this procedure, any Remote Alarm interfaced to Life Safety
control or monitoring station should be tagged out a avoid a false alarm to the site.
