General Maintenance; Operational Life - Honeywell Sensepoint XCD Technical Manual

Sensepoint XCD Technical Manual

11 General Maintenance

Access to the interior of the transmitter, when carrying out any work, must only be
Care should be taken when removing and refitting the Sensepoint XCD plug-in Sensor
Cartridge to the Sensor Socket so that damage to the connection pins can be avoided.
Before carrying out any work ensure local regulations and site procedures are followed.
Appropriate standards must be followed to maintain the overall certification of the sensor
To reduce the risk of ignition of hazardous atmosphere, de-classify the area or disconnect
the equipment from the supply circuit before opening the transmitter enclosure. Keep
Never attempt to open a junction box/enclosure or replace/refit the sensor in potentially
Take care when handling sensors as they may contain corrosive solutions.
Do not tamper with or in any way disassemble the sensor.
Do not expose to temperatures outside the recommended ranges.
Do not expose sensors under storage conditions to organic solvents or flammable liquids.
At the end of their working life, replacement electrochemical sensors for oxygen and toxic
gas must be disposed of in an environmentally safe manner. Disposal should be according
to local waste management requirements and environmental legislation.
Alternatively, old replaceable sensors may be securely packaged and returned to Honeywell
Electrochemical sensors should NOT be incinerated as this action may cause the cell to
Honeywell Analytics recommends that gas detectors are tested and re-calibrated on a six-
monthly basis, or according to site practice. For remote Flammable or Toxic sensors are
used with the XCD Transmitter, please refer to the individual sensor manuals for specific
recommended calibration periods.

11.1 Operational Life

The pellistors used in the Catalytic flammable gas sensor can suffer from a loss of
sensitivity when in the presence of poisons or inhibitors, e.g. silicones, sulphides, chlorine,
lead or halogenated hydrocarbons. The pellistors are poison resistant to maximize the
operational life of the Catalytic flammable sensor. A typical operating life, subject to the
presence of poisons/inhibitors is 36 months.
The NDIR (infrared) flammable gas sensor is not affected by the above-mentioned poisons
and therefore has a longer life span. A typical operating life is 5 years.
Typical life of a toxic gas sensor is dependant on the application, frequency and amount of
gas exposure. Under normal conditions (3 monthly visual inspection and 6 monthly test/re-
calibration), the XCD Oxygen and other toxic sensors have an expected life equal to or
greater than 24 months.
Refer to section 12 for sensor replacement procedures.
WARNINGS
conducted by trained personnel.
and transmitter.
assembly tightly closed during operation.
hazardous atmospheres.
Analytics clearly marked for environmental disposal.
emit toxic fumes.
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