29
monitor when calibrating using a CO
2
standard gas bottle see figure 16.
The device
will be damaged
by the high pressure of the standard Cal Gas
Bottle if the connector is not used. It is strictly forbidden to connect the cal
gas bottle directly to the device. One end of three-pass connector must be
directly open to air to release gas pressure and protect the monitor.
Two tubes (whose length can extend outside room
): The standard gas
flows into the air continuously through the three way connector and the
module pump also vents the gas that is checked. During calibration CO
2
gas of a higher concentration can easily and quickly accumulate around
the device. To prevent any potential of this affecting and influencing the
calibration of the Zero base vent the connections from the three way adapter
and the monitor to outdoor.
1.2 Connect as follows:
Figure 16
2. Warm-up:
Turn on power and run the unit for 20-30 minutes and adjust the
pump flow rate to over 120cc/min. To check if there is a leak use the following
method: Squeeze the sampling tube by hand, the operating noise of the
sampling pump will increase noticeably. If the sampling pump does not
accelerate and its operating noise also does not change then there must be
a leak in the gas loop. You must then find out where the leak is and solve it,
otherwise, it will lead to incorrect calibration. After warming-up, open the flow
of standard cal gas, and listen if the sound of pump is as same as original
one. If the pump’s turning is slow and its turning sound is weak, that means
the standard gas pressure/flow is too large.
Turn down the Cal Gas flow rate until the sound of sampling pump resumes
its original volume.