NOTE: Both maintenance modes 1 and 2 function only on the base unit. Even when there is no main unit,
analog output of 4mA is possible on maintenance mode 2, which enables a loop check during setup.
Chapter 8 – Maintenance and Inspection
• The Sensor Modules do not normally require gas calibration to be performed on site. Gas calibration
of the sensor module is performed by New Cosmos at the time the sensor is manufactured.
• The CDS sensors (electrochemical) have a life of 2 or more years depending on the specific sensor.
CDS sensors are labeled with a manufacture date. All CDS sensors must be gas tested or replaced
every 16 months from the manufacture date or 12 months from the install date, whichever comes first.
• CDS sensors also have an “install by date”. If a sensor is installed after the “install by date” monitor
the sensor in maintenance mode 2 (MNT 2) to ensure the sensor is stable and not drifting before
placing the PS-7 in the run position. The actual time for the sensor to stabilize will vary based on the
sensor type. Once stable the sensor is ready to use.
• CHS sensors have a stated service life of 5-7 years based on the type of sensor. The actual life of the
sensor can exceed the stated service life. CHS sensors should be gas tested on an annual basis.
• The following table provides an inspection timetable for various components of the Gas Detector unit.
Periodic inspections refer to inspections that should be performed every twelve months by either the
user or an authorized representative of New Cosmos.
Frequency and Content of Inspections
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