PROMET EExd Process Moisture Analyzer Sampling Systems
Installation, Operation & Maintenance Manual
and User
Guide
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16
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www.michell.com
4.
OPTIONS
4.1 Enclosure Heater Temperature Control
Sampling systems fitted within enclosures are temperature controlled to maintain a
constant temperature environment of at least 10oC above the highest envisaged dew
point temperature independent of surrounding temperature variations. The temperature
control system as standard consists of a heater controlled by a fixed preset thermostat
to provide internal ambient air temperature control of >15oC.
As an option the temperature control system can be supplied with a heater controlled
by an adjustable setpoint thermostat to achieve internal ambient air temperature
control up to 60oC for maintaining more stable measurement conditions for installations
in adverse climates.
The capillary tube thermostat marked „Enclosure Heater Thermostat‟ contains an
adjustment screw for the temperature control set point (factory set to approximately
25ºC) to maintain an ambient air temperature >20ºC.
WARNING
this operation will expose electrical parts operating at high voltage
therefore isolate power supply from sampling system
and if necessary
ascertain that no Explosive Gas Atmosphere is present before making
adjustments.
To adjust the setting proceed as follows:
1.
Unscrew and remove the cover of the thermostat box.
2.
Turn an adjustment screw pointer located inside, clockwise to increase and anti-
clockwise to decrease the temperature set point.
3.
The temperature markings around the adjustment screw pointer equate to the
approximate temperature values for the heater of 0 ºC to 60 ºC.
4.
After adjustment is complete replace the cover of the thermostat box.
WARNING:
The thermostat setting should not be increased such that the internal
temperature of the sampling system rises above 60°C which is the
maximum permitted ambient temperature (Tamb) of the certified
PROMET EExd Analyzer.
