Page 10
007-03-004 Issue D
www.skcltd.com
1) Setting an Air Sample Train Flow Rate
a. Ensure that the chek-mate flowmeter has been in the location where it is to be used for
enough time for its temperature to stabilise to the ambient temperature. A minimum of
10 minutes is recommended. Shield the flowmeter from exposure to direct sunlight to
prevent heating of the case by the sunlight.
b. Switch on the flowmeter by pressing the on/off button on the front. The LCD screen will
cycle through the startup messages ‘On’ followed by the flow meter range (‘0.5 L’ for the
375-00205 model and ‘5.0 L’ for the 375-0550 model), and will then indicate the current
flow rate or ‘- - - -’ if there is no airflow or the flow rate is below the minimum display
value. The minimum display value is dependent on the atmospheric conditions, but at
20 °C and 1013.25 mbar (1atm) the values are 5 ml/min for the 375-00205 model and
0.3 litre/min for the 375-0550 model. The minimum display value will be higher when the
chek-mate is used at higher altitudes and temperatures.
Note:
The chek-mate flowmeter does not perform a zero of the flow reading at startup
therefore it is also possible to switch on the flowmeter with the air sample train already
connected and airflow passing through the flowmeter without affecting the accuracy of
the flow reading.
c. Connect the flowmeter outlet hosetail to the inlet of the air sample train using a length
of flexible tubing (1/4” or 6.5mm bore tubing is recommended) and calibration adapter
if required.
Using the chek-mate Flowmeter