Monitoring VOC Gases
The device is equipped with a PID sensor that detects a variety of VOC gases. The device displays the gas concentration in parts per million (ppm), µmol/mol or mg/m3 on the Measuring page.
WARNING!
If an alarm is triggered while using the device, leave the area immediately.
Failure to follow this warning can result in serious personal injury or death.
The device has four gas alarms:
| • | HIGH Alarm |
| • | LOW Alarm |
| • | STEL Alarm |
| • | TWA Alarm |
If the gas concentration reaches or exceeds the alarm set point or the STEL or TWA limits, the:
| • | alarm message displays and flashes in combination with the corresponding gas concentration |
| • | backlight turns on |
| • | alarm sounds (if active) |
| • | alarm LEDs flash (if active) |
| • | vibrating alarm triggers (if active) |
To reset the alarm press the p button.
False VOC alarms can occur due to changes in barometric pressure (altitude), humidity or extreme changes in ambient temperature.
It is recommended that a VOC calibration be performed at the temperature, humidity and pressure of use.
Be sure that the device is in known fresh air before performing a calibration. For optimal lamp strike, the PID lamp should be started within the normal temperature range.
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When the device is calibrated in an dry, air conditioned environment and taken to a high temperature and high humidity outdoor environment, a VOC Low or High alarm may be triggered by this sudden change. It is recommended that the PID sensors be cleaned prior to this transition to avoid this situation, or to acclimate the sensor to the outdoor conditions in a known safe area. |