PureAire Monitoring Systems, Inc.
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P a g e
3.2.4 Air Check
✓
Sample Inlet Filter
To protect the pump from dust and water, the use of a special filter is supplied. On installation, attach
the particulate/water filter to the sample inlet by pushing the filter into the ¼” tube compression fitting.
Aligning the arrow, (printed on the filter) towards the monitor. The filter pulls air from both vertical
and horizontal tubes.
Never connect any sampling tubing to either tubing ports.
When sampling
remote,
ALWAYS
locate this filter at the end of the sample line.
The
Air Check
✓
O
2
Sample Draw monitor has an internal sample flow rate that is programmed at the
factory and cannot be changed in the field. A flow sensor on the relay board continually monitors flow
rate for1/2” OD x 3/16” ID tubing up to 100 feet. When a loss of flow is detected, a signal is sent to
the fault relay and the front mounted LED will activate. Sample flow to the monitor is continuously
monitored and controlled by the flow control microprocessor.
NOTE:
If using longer lengths of sample tubing, the dust/water filter must be located
at the end of the sample line to work properly.
NOTE: If the sample line is blocked, the fault indicator will illuminate, and the pump will
accelerate to try and reestablish the proper flow rate. If the line is cleared, the pump
will speed and slow down and the fault light will turn off when the flow rate is back to
factory setting. The “Flow Fault” message can be cleared by pushing the joystick down
Depending on the environment, replacement of this filter should be performed every 12 months. In
dusty environments, filter replacement may need to be replaced more frequently. If the filter becomes
completely blocked, the internal flow sensor will detect the loss of flow and activate the fault relay and
LED.
Order filter part number 90179
NOTE: NEVER connect
any tubing to either the
inlet or drain port of the
filter.
Sample air can enter from
either port. This is the
reason why the water
filter must be located at
the end of the sample
line.
