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Rev. C | 2022.02
FCS - Operation Manual
12.3.3 Calibration Expired Priority Logic
Calibration frequency depends on many factors such as: the type of gas detection system,
how it is being used, the required accuracy of the system, manufacturer’s recommendations,
application specific health and safety laws and regulations, whether you suspect there are
environmental conditions or potential damage that has occurred to the instrument that could
affect its performance, whether bump tests are part of your regular maintenance program,
etc. At the bare minimum, fixed gas detection systems in underground parking garages,
refrigeration applications and other less frequently occupied areas or occupied on a short
term basis should be calibrated annually. Applications like swimming pools (chlorine), arenas
(ammonia) and frequently occupied or occupied for long periods of time areas should be
calibrated a minimum of every 6 months. Be sure to follow the Occupational Health and
Safety standards and regulations for the type of application and jurisdiction.
Use the Calibration Expired Priority to set the number of months within which the sensor(s)
should be calibrated. If /when the time expires, the FCS will trip that priority as a fault. If the
fault occurs, the senor should be calibrated as soon as possible. The system will remain
operational, monitoring the gas levels but scheduling a calibration is highly recommended.
Once the sensor has been calibrated, the Set Channel Calibration Date should be updated.
Refer to Section 7.3 Set Date the Channel was Calibrated.
NOTE:
The Calibration Expired Priority Logic will not work if the Calib. Expired Faults flag
is set to Dis (disabled) in the System STEL/TWA screen in the Set Alarm Menu (passcode
2012).
Use the - and + buttons to ensure Calibration Expired is showing.
Priority:
If all the sensors require the same length of time before calibration, choose one
priority number to assign to the channels for which you want to use as the Calibration
Expired Priority. If some sensors need to be calibrated in 6 months and others in 12, set
up two priority numbers.
Months:
Enter the number of months that the calibration is valid for. 12 months (1 year)
is the default factory setting. The reference used for counting the months is the current
date of the real time clock in the FCS, which is set by the factory when the device was
manufactured. To change or update the date and/or time, refer to Section 6.2 Set Clock.
NOTE:
The priority must be assigned to the Channel Logic screen. In the Relay Logic screen,