PortaSens
III
Portable Gas Leak Detector, Model D16
Operation and Maintenance Manual
Rev-A Feb 2018
- 38 -
Owner Calibrations
Owners who wish to perform, or verify, the sensor’s calibration should
have the appropriate, traceable gas standard(s) to use for the zero and span
calibration methods below. Atmospheric air may be used for zero
calibration, if it is known with certainty to be free of the target and
interference gases. Note that indoor Carbon dioxide levels may be higher in
winter, when doors and windows are closed. Levels of Carbon monoxide
(CO), oxides of nitrogen, and ozone may be higher in summer, due to smog.
When in doubt, use bottled zero air, or Nitrogen (required for O
2
sensors),
when performing this procedure.
Pressurized Gas Sources
Supplying gas to the device from a pressurized source requires a bypass-
T to be inserted between the source and the manifold (Figure 20 below). This
is required to limit gas pressure on the intake side of the sample pump when
the source is open, and prevent the inlet from being blocked when the source
is closed. The flow rate into the T must exceed the pump flow rate of
400cc/minute (0.85 SCFH), or the calibration gas may become diluted. A flow
rate of 500 cc/min (1.06 SCFH) into the T is recommended.
Figure 20. Gas source connection.
GAS SOURCE
BYPASS- T
VENT
