Table of Contents
Advertisement
on the concentration level of the gas used for calibration, the current value measured at the
detector output will be different. Span calibration lasts 30 seconds. If the value measured
from the detector is higher than the reference value while applying gas, the zero calibration
button should be pressed until the current level is reduced to the reference value. If the
measured value is lower than the reference value, the span calibration button must be
pressed until the current level is increased to the reference value. The button functions
changes automatically when the span calibration process has started: zero calibration button
decreases the current level and span calibration button increases the current level. After 30
seconds, the calibration will be completed automatically and the adjusted level will be saved.
When the span calibration is completed, gas flow should stop and calibration cap should be
removed from sensor head
Maintenance
Important: Do not press both buttons.
Important: All replacement actions (sensor, sinter, and sensor head) shall be done by
Prosense service personnel as it needs some special steps that should be performed in
Proactive Maintenance:
laboratory environment.
All gas detectors including both for flammable and toxic gases should have to pass a functional
test and calibration periodically according to industrial standards. The test results and
calibration reports should be recorded in maintenance books.
To make sure the detectors functioning correctly company should prepare detector check
procedures. The procedures should include daily, weekly and monthly check activities
depending of the environmental and process conditions. The control panels will report fault
condition in case detector analogue output provides signal 0-2,5mA levels. Also they will
report fault in case they could not communicate to the detector.
It might be necessary to perform bump test to make sure detectors responding correctly to
test gases. If any detector does not respond to the test gases, it should be removed from the
operations and send to service for repair. Detector sensor head should be clean and open to
gas diffusion without any obstacle. Sensor head should not be washed with pressurised water
Operational Life:
or gases.
Catalytic/Pellistor flammable gas sensor made by using the pellistor that suffer from a loss of
sensitivity when in the presence of poisons or inhibitors, e.g. silicones, sulphides, chlorine,
lead or halogenated hydrocarbons. The pellistor are poison resistant to maximize the
operational life of the Catalytic flammable sensor. A typical operating life, subject to the
presence of poisons/inhibitors and environment conditions is 48-60 months. The NDIR
(infrared) flammable gas sensor is not affected by the mentioned poisons hence has a longer
20
PRS-UM-PC3-EN-Rev.04-06.2020
Advertisement
Table of Contents
