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3. PHOTO IONIZATION DETECTOR (PID) - VOCs
Photo ionization detectors are the most common method to measure volatile organic compounds
(VOCs) and other gases in indoor air quality in concentrations in parts per billion (PPB) and parts per
million (PPM).
The PID options have the following specifications:
GAS
RANGE
ACCURACY
VOCs* LOW (STANDARD)
0 - 20 000 ppb
0 - 46 000 μg/m³
±10% rdg ±20 ppb
VOCs* HIGH
0 - 200 ppm
0 - 460 mg/m³
±10% rdg ±2 ppm
*VOC sensor will not measure Formaldehyde. The ionization potential of the sensor is outside of the VOC sensor range. If you need
Formaldehyde, you need to use the direct CH2O sensor.
4. NON-GAS SENSORS
A.
Ambient Temperature sensor
This is a NTC sensor located on the front panel of the monitor. The ambient temperature is
displayed on the
MEASURE
screen in either °F or °C. The dew point is calculated from the
ambient temperature and relative humidity. The dew point is displayed on the Small and
Large Font
MEASURE
screens as DPt.
B.
Humidity sensor
This is a capacitive sensor located on the front panel of the monitor. The relative humidity is
displayed on the
MEASURE
screen in %RH (% Relative Humidity). The Wet Bulb is
calculated from the ambient temperature, relative humidity, and barometric pressure. The
wet bulb is displayed on the Large Font
MEASURE
screen only as WBT.
C.
Barometric Pressure sensor
This is a piezoresistive sensor located at the front panel of the monitor. The barometric
pressure is displayed on the Small and Large Font
MEASURE
screens as BP.
