The GFM436 will measure Flow, Peak Flow, DP and AP at the same time. This requires a connection to
be made to the Flow in port as shown in the diagram above.
The Flow Sample pipe is the section of pipe without the filter. This can be separated from the Gas
Sample pipe at the quick release coupling.
Connect the male fitting to the "Flow In" connection.
Press the right soft key to begin sampling.
Zero the readings by pressing the Middle Soft Key (Zero)
Press the right soft key to stop sampling.
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It is important to complete the zeroing in an environment where there is no flow or pressure
and ensure that the end of the flow tube is not exposed to any external flows or pressures.
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Connect the open end of the gas flow tube to the gas tap or sample point on the borehole.
Open the gas tap and press the Right Soft Key to begin sampling.
The Flow and Pressure display shows the Instantaneous Flow (Flw1), the Peak Flow (Flw2), DP and AP.
The Right Soft Key will toggle the sampling process on and off.
When the sample is active the screen will display live readings being taken from the gas.
When the sample is stopped the values are “frozen” at the last measured values.
When a sample is restarted the readings are unfrozen and the peak flow will be reset to the current
instantaneous flow.
If the instantaneous flow goes over range the peak flow will show over-range until it returns within
range.
Pressing the Left Soft Key, labelled “Store”, or the OK Key will bring up the Store Menu Window. For
details of the "Store" function please see page 47.
When finished turn off the gas tap and remove the gas pipe.
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