Maintenance; Battery Change - Benning MM 9 Instrucciones De Servicio

9.

Maintenance

Before opening the BENNING MM 9/ 10 make sure that it is free

of voltage! Electrical danger!
Work on the opened BENNING MM 9/ 10 under voltage may be carried out
only by skilled electricians with special precautions for the prevention
of accidents.
Make the BENNING MM 9/ 10 voltage free as follows before opening the
instrument:
- First remove the two safety measuring leads from the object to be mea-
sured.
- Then disconnect the two safety measuring leads from the BENNING MM 9/ 10.
- Turn the rotary switch  to the switch setting "OFF".
9.1 Securing the instrument
Under certain circumstances safe operation of the BENNING MM 9/ 10 is no
longer ensured, for example in the case of:
- Visible damage of the casing.
- Incorrect measurement results.
- Recognisable consequences of prolonged storage under improper condi-
tions.
- Recognisable consequences of extraordinary transportation stress.
In such cases the BENNING MM 9/ 10 must be switched off immediately, dis-
connected from the measuring points and secured to prevent further utilisation.
9.2 Cleaning
Clean the casing externally with a clean dry cloth (exception: special cleaning
wipers). Avoid using solvents and/ or scouring agents for cleaning the instru-
ment. It is important to make sure that the battery compartment and battery
contacts are not contaminated by leaking electrolyte.
If electrolyte contamination or white deposits are present in the region of the
batteries or battery casing, clean them too with a dry cloth.

9.3 Battery change

Before opening the BENNING MM 9/ 10 make sure that it is free

of voltage! Electrical danger!
The BENNING MM 9/ 10 is supplied by a fitted 9 V block battery.
A battery change (see Figure 11) is required, if in the display  the battery
symbol  appears.
Proceed as follows to replace the batteries:
- Disconnect the safety measuring leads from the measuring circuit.
- Disconnect the two safety measuring leads from the BENNING MM 9/ 10.
- Turn the rotary switch  to the switch setting "OFF".
- Remove the rubber protection frame M from the BENNING MM 9/ 10.
- Lay the BENNING MM 9/ 10 face down and release the two slot screws of
the battery compartment cover.
- Lift the battery compartment lid (in the housing recess area) from the bottom
section.
- Lift the discharged battery from the battery compartment and carefully
disconnect the battery supply lines from the battery.
- The new battery has to be connected to the battery supply lines, and
arrange these such that they are not crushed between the housing parts.
Place the battery/batteries into the battery compartment provided for this
purpose.
- Place the battery compartment cover onto the bottom part and tighten the
screws.
- Insert the BENNING MM 9/ 10 into the rubber protection frame  .
see figure 11:
Make your contribution to environmental protection! Do not
dispose of discharged batteries in the household garbage.

Instead, take them to a collecting point for discharged
batteries and special waste material. Please inform yourself
in your community.
03/ 2011
Battery change
BENNING MM 9/ 10

18