8
manual
19-11-2013
8. MEASURING WITH THE FLOWFINDER MK2®
The FlowFinder mk2® has two measuring modes. The so-called
‘validation mode’ and the ‘adjustment mode’. In the options
menu one of these modes can be set as default. At start up the FF-
mk2 will be ready to measure in the default mode.
The measuring mode can be recognized by the red blinking ‘0’
(adjustment mode) or the ‘- - -‘ (validation mode).
In validation mode the FF-mk2 a measurement starts by pushing the red button (behind the left knob).
The FF-mk2 decides when the measurement is ready, normally within 10 to 15 seconds. It will display the
measurement result which then can be stored by touching ‘store’.
In adjustment mode the FF-mk2 a measurement starts by pushing the red button. The blinking number
turns green and will change depending on the air flow volume. The measurement will only stop after the
red button is pushed again. This way you can adjust the diffuser or valve to the desired air flow. You may
take down the FF-mk2 to adjust the valve. Wait long enough until a more or less stable reading is reached,
also after placing the FF-mk2 back again. Always stop and start again when going from one measuring
location to another. The measuring result can’t be stored.
Switching between modes: push the ‘return’ button in the right upper corner. Then you can select either
‘validate’ or ‘adjust’. To change the default mode you have to go to the options menu.
To do a measurement, hold the FlowFinder mk2® by the left and right round handles and place the
instrument over the outlet or inlet you want to measure. Make sure to make a tight connection by
pushing enough to avoid measuring secondary air.
Press the red button behind the left knob shortly in order to start the measurement.
In validation mode the text “compensating pressure” will appear, after a few seconds followed by ”mea
-
suring”. Also an arrow will appear on the bottom of the display, indicating the direction of the flow.
After approximately 10 seconds the result of the measurement will appear, expressed in l/s, m³/u of CFM.
In adjustment mode the colour of the blinking number will turn green and change until it reaches the air
flow amount.
As a consequence of variations in the ventilation system itself and to lower the total uncertainty,
we advise to repeat the measurement 2 or 3 times shortly after each other.
A new measurement can be started by pressing the red button.
Best is to wait until the ventilator in the FF has come to a rest (at low flows) or runs at its non-zero
pressure compensated speed as dictated by the flow.
