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007-03-004 Issue D
Page 11
Using the chek-mate Flowmeter
d. Start the air sample pump and observe the reading of the flowmeter until it achieves
a steady value. The reading may fluctuate by a small amount either side of the steady
value (up to ±0.5 ml/min on the 375-00205 model and ± 0.005 litre/min on the 375-0550
model).
If the flow is fluctuating there are two suggested options to determine the average flow
value -
•
Observe the highest and lowest readings and calculate the average of these two
readings, or
•
Note 10 chek-mate readings and calculate the average of the 10 readings.
Note:
It is recommended to allow the pump to run for a minimum of 5 minutes to
stabilise before adjusting the flow rate.
e. Adjust the air sample pump to give the desired sample airflow rate.
f. Disconnect the tubing from the flowmeter outlet hosetail taking care to pull the tubing
in line with the axis of the hosetail and not to twist the tubing. Switch off the flowmeter
using the on/off button.
2) Automatic Power Off Timer
The chek-mate flowmeter will remain on indefinitely provided that an airflow rate above the
minimum display value is indicated. With an airflow rate lower than the minimum display