Casella CEL CEL-360S - Manual (Page 22)

11. Intrinsically Safe Models
Models in the CEL-320/360 series are available with Intrinsic Safety
approval for use in hazardous areas.
The Intrinsically Safe versions are fitted with a different firmware
version but are functionally identical to the standard products. They may
be connected to a personal computer for setup and download of results
using the CEL-6702 or 6704 Windows software packages.
Products rating - to EEx ia IIM1, EEx ia IIC T4 II1G. Intrinsically
Safe Certificate Number - Sira 05ATEX2027X.
Approved Power Supply
Only the Duracel® MN1604 alkaline type battery may be used in these
meters (9 V radio battery). The use of any other battery will invalidate the
intrinsically safe certification.
Battery Life
Approximately 30 hours under typical conditions.
Special instructions
The battery must be replaced only in a non-hazardous area.
The instruments must be calibrated in a non-hazardous area
following the same instructions as for the standard models.
Any repairs needed for the Intrinsically Safe models must be
carried out only by an approved CASELLA CEL service centre following
approved written procedures.
Page 22 - CEL-320/360 Getting Started