Introduction
A leak can be caused by loose connections, worn seals (o-rings) or split tubing.
If a leak occurs, this can affect the flow rate which will have a big impact on the accuracy of the measurement.
To understand how often you should perform this service activity, click here.
Tools
No tools specified.
Parts
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Enter service mode so any fluctuations in the data caused from this activity can be excluded from air quality reports.
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Adjust the sample flow by pulling the adjustment knob outwards, turning the knob to increase/decrease flow, and pushing the knob back in to lock when desired flow has been reached.
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Fully open the sample flow adjustment valve, which is located on the face plate of the pump module.
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On older monitors, the sample flow adjustment valve is positioned at the bottom of the enclosure under the PDI cover.
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Block the purge flow by pinching the purge tube.
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On older monitors, fully close the purge valve by pushing the valve handle towards the pump module.
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Remove the TSP head and install the vacuum gauge above the sharp cut cyclone.
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Wait for the gauge to stabilise.
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The gauge should reach at least -60 kPa while power is connected.
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Stop the the sample and purge pumps by pulling out the black and red power cables from the electronics module.
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Count how long it takes for the pressure to change by 10 kPa.
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If the pressure change (leak rate) is greater than 10 kPa in 10 seconds, you'll need to check for loose connections, worn seals (o-rings) or split tubing.
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For example, if the needle moves from -70 kPa to -60 kPa in 20 seconds, this is OK, but if if moves from -70 kPa to -60 Kpa in 8 seconds, this indicates a leak.
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For further support, contact Technical Support.
For further support, contact Technical Support.
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