Casella CEL Microtherm WBGT heat stress monitor - Manual (Page 13)

2. OPERATION
The Microtherm Heat Stress WBGT is a sensitive scientific instrument which
should not be exposed to excessive moisture, vibration, or physical shocks.
The following steps must be performed before your Microtherm can be used
under operating conditions. It is suggested that you follow the sequence of
sections in this chapter.
2.1 Preparation for Use
2.1.1 Power Supply
The Microtherm is powered by
four AA size batteries located in a
compartment in the underside of
the instrument.
The instrument can also be
powered continuously using
external power applied via the
12 V DC socket (Figure 6),
without the need for internal
batteries to be installed. To gain
access to the batteries, lift the
bottom end of the cover slightly
to release it, then slide
downwards in the direction of
the arrow mark (Figure 7).
Warning !
One cell installed with the
wrong polarity may still
allow operation, but can
cause overheating severe
enough to rupture a cell
and damage the instrument.
Load four new batteries (AA or equivalent) in the orientations shown in
Figure 8. Rechargeable nickel-cadmium (NiCd) 1.2 V batteries are recom-
mended. 1.5 volt alkaline and other non-rechargeable batteries can also be
used.
Rechargeable batteries may be supplied by Casella CEL in a discharged state.
In order to obtain maximum capacity from new NiCd batteries, several charge
and discharge cycles may be required.
Figure 6: Bottom panel connectors
Figure 7: Removing battery cover
00058
12 V DC
Power
RS 232
Tripod Bush
Infrared Interface
Lift End
o
Release
Cover
Slide Off
00021
00015
Figure 8: Loading batteries
Page 13 of 44
Operation MICROTHERM Heat Stress WBGT &
WinHSM Application Software - User Manual