Operation Comfort And Ergonomics; Operation; Before First Use; Inserting The Batteries - Observator Instruments Diff-Automatic User Manual

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 when changing the grill. For your convenience you are
able to set the arms and the display unit in any position. This will make it easy to operate and to read out.
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 measuring the pressure difference and compensate this with the build-in fan.
The rotation speed of the fan makes the pressure difference zero, this will solve the faulty measurements.
In this situation the volume flow through the grill is exactly the same as it was before the DIFF was in
place. The DIFF gives the right measurement of air flow and temperature after the beep.

2.3 Before first use

Make sure there is no packing material or any other objects in the DIFF.

2.3.1 Inserting the batteries

Charge the SANYO or PANASONIC ENELOOP batteries as described in the manual of the included
charger (we recommend to read this manual carefully). Use the standard charge mode whenever
possible, but definitely the first couple of times. (Please note: our specifications only apply when using the
prescribed battery type)
The batteries are fully charged when the green LED lights continuously lit. The batteries will only reach
their full capacity after fully charge and un-charge them multiple times (see chapter 5).
Make sure the Diff is switched off when replacing the batteries. The batteries
are placed in the battery compartment on the backside of the display housing.
Unscrew the thumb screw complete and move the cover upwards, now you
can remove the cover of the battery compartment. Take out the battery holder
carefully to replace the batteries.
Note the polarity when placing batteries! When placing the batteries in the wrong way, the
electronics of the Diff can be damaged. The battery positions are marked on the black battery
holder. The stud is the + and the flat side is the – of the batteries. The electronics are protected by
means of a fuse, see item 9.2.
Hold the wires on top of the batteries when placing the battery holder back. 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.
Version: 12.6 EN Date: 22-09-2020
User Manual Diff
AT-DIFF
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