GENERAL DESCRIPTION
19
LIMITED TEMPERATURE SHEATH HEATER (OPTIONAL)
Each heater has its own temperature controller and redundant high limit safety.
The temperature controller is set to maintain the heater sheath temperature
below 80% of the auto ignition temperature of the fluid or vapor in the
chamber. The temperature high limit is set +10°C above the temperature
controller as a safety.
Per section 501-10 of the N.E.C.:
“The heater shall not exceed 80 percent of the ignition temperature in degrees
Celsius of the gas or vapor involved on any surface that is exposed to the gas or
vapor when continuously energized at the maximum rated ambient
temperature.”
GAS MONITOR (OPTIONAL)
The optional gas monitoring system measures and detects hazardous gases. The
gases monitored are specific to the application and determined based on what
products will be tested in the environmental test chamber. The gas monitor
uses a sampling hose for individual or multiple gases. Examples include carbon
monoxide (CO), carbon dioxide (CO2), hydrocarbons (HC), and variations in
oxygen (O2) content. When a gas is detected, the chamber will shut down and
an alarm will be shown on the chamber display. The gas monitor also includes a
stand-alone display which provides readings for the gases specified. The alarm
setpoints can also be adjusted as needed.
For additional details on the use and care of the Gas Monitor system, see the
manufacturer’s manual found in the Accessories folder on the electronic media.
CHAMBER PERFORMANCE
The performance of your chamber is significantly affected by the characteristics
of your test sample. Such characteristics include size, material, shape, weight,
and power dissipation if energized. The test sample should be placed in the
chamber in a manner that allows proper ventilation. Air flow is taken in from
the bottom of the plenum and exits from the top. Test samples should be placed
on the shelves; not placed directly on the chamber floor. Multiple test samples
should be distributed throughout the chamber to ensure proper airflow and to
minimize temperature gradients.
Shelves with product can be slid out of the chamber (approximately halfway).
The "C" channel shelf rails will prevent the shelf from tipping. There is NOT a
mechanical stop to prevent the shelf from being pulled all of the way out.
Shelves pulled out more than halfway can become unstable.
To relocate "C" channel rail, remove shelf, lift front of rail up and pull forward.
To replace rail, place pin on rear of rail into the hole in the plenum and line up
with slot on shelf rail. Push rail back and then down, locking rail into place.
water filter daily. Empty
when full as required.
Failure to follow this
Procedure will result in
damage to the Gas
Monitor and is NOT
covered under warranty.
If other devices are used to
take measurements within
the chamber, the readings
between the chamber
controller and the other
instruments will vary slightly
due to the tolerances
between the two devices
and their individual sensing
elements.
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