Honeywell Sensepoint XCD RFD, Техническое руководство

Страница: 33 / 79

Sensepoint XCD RFD Technical Manual SPXCDHMRFEN Issue 4_08-2016
33
11 General Maintenance
WARNINGS
Access to the interior of the transmitter, when carrying out any work, must only be
conducted by trained personnel.
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
and transmitter.
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
assembly tightly closed during operation.
Never attempt to open a junction box/enclosure or replace/refit the sensor in potentially
hazardous atmospheres.
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.
The Sensepoint sensor is a possible Electrostatic risk - Do not rub or clean with solvents.
Clean with a damp cloth. High velocity airflows and dusty environments can cause
hazardous electrostatic charges.
For remote Flammable sensors used with the XCD RFD Transmitter, please refer to
the individual sensor manual for specific recommended calibration periods.
11.1 Operational Life
The equipment should be checked following exposure to known contaminants, and
recalibrated if necessary.
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.
Refer to section 12 for sensor replacement procedures.