Chapter II X02137C00 - Ed. 1 - 06/07
Intrinsically safe portable digital multimeter
25
1. GENERAL INSTRUCTIONS
You have just acquired an intrinsically safe portable digital multimeter and we thank you for
your confidence.
For your own safety and that of the unit, you must observe the instructions described in this
manual to ensure safe operation of the multimeter, in the specified conditions of use.
This MX 57 EX multimeter complies with safety standard EN 61010-1 (2001), double insulation,
relative to electronic measuring instruments. This instrument has been designed for indoor use, in
an environment with pollution level 2, at an altitude of less than 2000 m, at a temperature
between 0°C and 50°C, with relative humidity of less than 80% up to 40°C.
It can be used for measurements on Measurement category III type of circuits for voltages no
higher than 600 V (AC or DC) in relation to the earth.
The safety of any system incorporating this instrument is the responsibility of the system
assembler.
It meets Cenelec European standards EN 60079-0, EN 60079-11 and EN 61241-11
(electrical equipment for explosive atmospheres) as per Directive 94/9/CE (ATEX) and
international standards IEC 60079-0, IEC 60079-11, IEC 61241-0, IEC 61241-11 as per
the IECEx certification system.
It enables electrical measurement in explosive atmospheres in intrinsically safe circuits (gas per
group II C, temperature class depends on the battery) in potential danger zones (zone 1) and in
gassy mines (group I). In accordance with the standard, the certification allows voltage
measurements up to 60 V, current measurements less than 500 mA and not over 40°C.
1.1. Safety measures
After a use on circuits other than those of intrinsically safety, the user must observe a
period of 3 min. waiting before carrying the multimeter in a dangerous area of EX class.
1.1.1. Utilisation of the intrinsically safe multimeter in danger zones
The safe use of equipment in danger zones requires familiarity with the group of gases and
comparison of the self-ignition temperature of the gas mixtures involved with the temperature
indicated on the equipment.
This multimeter must be used only by personnel who are familiar with the rules for explosive
atmosphere equipment and have undergone appropriate training.
1.1.2. Before use
∗ Before use in explosive atmospheres, check the type of battery fitted in the
instrument to determine the authorised class of temperature.
If necessary, adapt the battery according to the references in the tables in the Power
Supply §. on page 43.
∗ Comply with environmental and storage conditions.
∗ The electrical parameters of the intrinsically safe circuit must comply with the
following values : U ≤ 60 V (peak value) or I ≤ 500 mA.
The MX 57 EX multimeter may be used for short measurement operations on
category
″
ib
″
intrinsically safe circuits.
″
"Short" means that the multimeter must
not be used continuously, nor be used as a fixed unit.
The MX 57 EX multimeter may be considered as a passive element without
energy accumulator, i.e. with no inductance lint
≈
0, or capacitance Cint
≈
0.
During a voltage measurement, to prevent any overload, the existing intrinsically
safe safety circuit must never be opened.
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