User's Manual

24 LS420 Universal User Manual V2.91 2003-01-21.doc

Chapter 3: Changing Batteries

3.1 Changing Load Sensor Batteries V1.4

DO NOT change load sensor batteries without first

reading these instructions.

Many operators of LS401 and LS420 systems damage their load

sensors with incorrect battery changing procedures.

ALWAYS

replace all three batteries of a load sensor at the same

time.

Replacing just one or two batteries will cause the unchanged batteries

to reverse polarity, dramatically reducing the efficiency and life of the new bat-

teries. This means all batteries will need to be changed again within the next

couple of days or even hours…

ONLY

use an RTV non-corrosive silicone (available where auto-

parts are sold) to reseal the box after batteries have been changed.

Many silicones give off corrosive gasses that destroy the battery contacts;

this renders the sensor useless.

ALWAYS

remove the battery closest to the indicator light first, by

applying pressure to the NEGATIVE pole ( – ) only.

When metal (i.e. a

screwdriver) touches the steel box and any battery pole other than the nega-

tive pole of the battery closest to the indicator light, a short is caused which

may burn the sensor's internal circuits.

all the instructions detailed below.

Carefully following every

step described below is the quickest, easiest way to successfully change bat-

teries without damaging the load sensor.

• Batteries should be changed when reduced to 10 – 20 % of full charge.

• The following items are necessary to successfully change the batteries of the load sen-

sor:

a) Three new, high quality, alkaline “C” cell batteries (e.g. Duracell Ultra or Energizer E2).

b) A Phillips head screwdriver

c) A small knife

d) A flat head screwdriver

e) Optionally, a very small flat head screwdriver

f) An RTV non-corrosive silicone (available where auto parts are sold)

Step 1.

Remove the load sensor from the crane

Step 2.

Clean off dust and grime.

During the following operations the interior of the battery box must be protected from dirt and

humidity at all times.