Observator Instruments DIFF, Руководство пользователя

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DIFF automatic volume flow meter
User manual
V11.2 - EN
Page 6
TDC 16-7-2012
OBSERVATOR
instruments
2.1 Operation comfort and ergonomics
The DIFF is self adjusting for inlet and exhaust grilles. The DIFF automatically detects the flow
direction, so the DIFF does not need to be turned around. Always place the square side over or
tight against the grill. For your convenience you are able to set the arms of the Diff in any positon
that will make it is easy to operate and to read out. Just make sure the readout panel is not in the
airflow. Use of a ladder is mostly unnecessary because of these possibilities
2.2 Operation
Measuring on a vent will cause a difference in pressure caused by the measuring instrument
itself.This difference in pressure will cause a deviation in the air distribution that causes a faulty
measurement. The DIFF solves this problem by adjusting the speed of the build-in fan according
to the measurements. This makes the volume flow through the grill exactly the same as it was
before the DIFF was in place. The DIFF give the right measurement of air flow after the beep.
2.3 Before first use
Make sure there is no packing material or any other object in the DIFF.
2.3.1 Inserting the batteries
Charge the SANYO batteries as described in the manual that is included with the charger (we
recommend to read the manual carefully). The included battery charger is designed for the usage
with the SANYO AA NiMH 2700 mAh batteries. This battery charger protects the batteries against
overcharging and high temperatures. Use the standard charge mode whenever possible, but
definitely the first couple of times. The batteries are fully charged when the green LED lights
continuously lit. The batteries will only reach their full capacity after fully charging them multiple
times (see chapter 5).
Switch off the instrument when replacing the batteries. The batteries are
placed in the battery compartment on the backside of the electronics
housing. Unscrew the thumb screw to open the cover of the battery
compartment to take out the battery holder to replace the batteries.
Note the polarity when placing batteries! The electronics are protected by means of a fuse,
see item 9.2. The battery positions are marked on the black battery holder. The stud is the
+ and the flat side is the – of the batteries.
Hold the wires above the batteries when placing the batteries. The wires can be pinched off when
they are positioned below the battery holder. Push the battery holder to the right side of the
compartment and place the cover.