33 • Measuring Mode, Normal Operation GX-6000 Operator’s Manual
VOC Detection
When monitoring for VOCs using the PID sensor, keep the following in
mind:
• Regardless of what gas the PID sensor is calibrated to (factory calibration
is to isobutylene), the PID sensor will still detect and respond to a variety
of volatile organic compounds (VOCs).
• The PID channel will indicate an upscale reading if one of a variety of
combustible gases is present. If %LEL concentrations of one of these
combustible gases is present, the PID channel may indicate an overscale
reading.
• If concentrations of methane greater than 10% LEL are present in the
monitoring environment, the PID channel’s reading will be suppressed.
• The PID sensor will also respond to H
2
S and NH
3
, so if H
2
S or NH
3
is
present, the PID channel may indicate an upscale reading depending on
the concentration present.
• If your instrument has both a low range PID sensor and a high range PID
sensor installed and
if you are monitoring for gases in the higher range,
the low range PID channel may be in over range alarm while monitoring,
depending on the level of VOCs present.
Oxygen Detection
Exposing the galvanic oxygen sensor to halogen gas or sulfides may shorten
the sensor’s life or cause malfunctions or inaccurate gas readings. Minimize
the sensor’s exposure to these gases as much as possible. If exposure occurs,
allow the instrument to draw fresh air and confirm that the readings return to
fresh air values.
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