Cool Sensor
All Gas Types Available
• Infrared measuring principle (ndir)
• dual beam technology
• high selectivity
• fast response
• pumped continuous sample
• optimised gas circulation
• analogue output 4~20mA
• A tmospheric pressure compensated
• weatherproof
The Cool Sensor uses proven non-dispersive single beam dual-wave length infrared principles to detect and monitor a range of different freon gases. This non-poisoning sensing technique relies on the target gas having a unique well-defined absorption signature. This is used to identify the presence of the target gas and is highly specific. Using a suitable infrared source, an analysis of the optical absorption through the gas allows the concentration of the target gas to be determined. All sensor driving is internal to the transmitter and full fault monitoring of the sensor and transmitter is continuous.
Specifications
Measurement principle Non Dispersive Infra-Red (NDIR), dual wavelength
Measurement range: See gases section on page 1
Supply voltage: 24V DC ± 15 %
Supply current: 250 mA average
Output 4~20mA analogue
Response time (t90): Appr. 20 seconds
Long term stability (zero) (5): ≤ ± 2 % FS over 12 month period ≤ ± 4 % FS over 12 month period
Long term stability (span) (5): ≤ ± 2 % FS over 12 month period ≤ ± 4 % FS over 12 month period
Temp. dependence (zero): ≤ ± 0.2 % FS per °C ≤ ± 0.2 % FS per °C
Temp. dependence (span): ≤ ± 0.4 % FS per °C ≤ ± 0.4 % FS per °C
Air pressure: 800 to 1200 hPa
