6.2 Changing the batteries
Toxic gas and oxygen versions are supplied with
alkaline batteries which should power the
instrument for a year.
•
Disassemble in a clean, dry environment and
observe anti-static handling precautions.
•
Remove side fixing screws
•
Remove calibration adjuster cover.
•
Slide lower case section from top section.
•
Remove batteries from clips.
•
Replace batteries using only approved types*
ensuring correct polarity orientation.
•
Refit lower case section and screws ensuring
seals are correctly fitted in grooves.
*Duracell MN1500 LR6
Ever Ready Energizer LR6BA
6.3
Charger Supplies
These must not exceed 29 volts DC (11 to 16V is
ideal). They can be either:-
(a) a mains DC power supply such as those in
Section 14.2, “Spare Parts” meeting
EN60742 insulation class II (Europe) or
UL1310 insulation class II (United States)
or
(b) a battery or other isolated DC source.
7. Alarm Types
There are two instantaneous alarms; level 1 and
2. For toxic gas instruments, there are also two
time weighted average (TWA) alarms which
operate at short term (15 minute) and long term
(8 hour) exposure limits. All alarm thresholds can
Gasman II
Instruction Manual
Issue 5
Page 16
11/99
