3M 740 Series Maintenance

3M ™ Multi-Gas Detector 740 Series with Data Logging
The battery must be replaced in a non-hazardous area only. Battery replacement is not an
intrinsically safe operation.
The detector may be operated with a lithium ion battery or with 3 approved AAA size
alkaline batteries. The detector will recognize a new type of battery pack upon start up.
See the user instructions for a list of approved batteries and model number. The 3M™
Lithium Ion Battery (921-020-201) and Duracell® Copper Top® Battery will be shown
in this video demonstration.
Only the batteries listed have been evaluated to meet the requirements of intrinsic safety
for CSA approval. Use of batteries other than those listed in the user instructions m
impair intrinsic safety.
The battery should be replaced when the detector indicates a low battery condition or
according to an establish change schedule. To remove it:
a) Turn off the unit.
b) Unscrew the four screws on the back cover plate of the detector and remove
the cover plate.
c) Slide the Li-ion pack towards the bottom of the detector and pull if out or,
d) remove the AAA batteries from the battery compartment.
e) Place the replacement Li-ion battery pack into the battery compartment or,
f) place three AAA batteries into the battery compartment noting their
orientation.
g) Replace the back cover and four screws.
h) Turn the unit on to confirm proper operation.

Charging the Li-ion Battery

The 740 Detector comes with a charger (3M Part No. 457-221-005) that can be used
with 110-240 volt and 50 or 60 Hz electrical systems. The charger comes with 4
optional plugs to fit most electrical outlets found throughout the world. To assemble the
charger:
a) Select the plug for the system you are using.
b) Slide the charger on the plug until it clicks into place.
Software – Battery Maintenance