SPAN GAS VALUE:
The gas “concentration” that gives the instrument a full-scale or up-
scale output; this value is usually printed on the gas cylinder.
General Description
The Chillgard LS Refrigerant Monitor:
• provides a continuous indication of a refrigerant
gas concentration
• operates on the photo acoustic principle, and measures the
concentration of a refrigerant in a complex mixture of
background gases.
In the photo acoustic principle, sample gas is delivered to an
enclosed chamber which is periodically bombarded with infrared
(IR) radiation. If the target gas is present, it absorbs IR with each
pulse of light. These pulses are miniature sound waves which are
picked up by a microphone. The sound level is directly proportional
to the target gas concentration present in the gas chamber.
• is capable of measuring a refrigerant 0 to 1000 ppm full scale
• is housed in a rugged plastic enclosure
• has a standard 4 to 20 mA and RS-485 output
• has five LEDs to indicate power, fault and alarm conditions
• is highly selective to enable operation in areas with varying
humidity or in areas containing other contaminants. It may be used
for applications requiring long-term stability and low maintenance.
Applications
The Chillgard LS Refrigerant Monitor is factory-calibrated for a
refrigerant and can be used for applications such as:
• ventilation control
• ambient air monitoring for health and safety purposes.
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