MAS2600: Intrinsically Safe Installation Reference Manual
August 2023 RM 6000-01-001-24
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Installation and Special Considerations for Safe Use
Before installing intrinsically safe units within an approved installation, it is essential to
ensure that there are no deviations from the conditions of the order or the requirements of
the approved block schematic diagram and the following related instructions:
1. No circuits other than those shown on the drawing are permitted. There must be no
interconnection to any other circuits.
2. The intrinsically safe cabling must not be connected to non-intrinsically safe circuits,
through any plug, socket or other form of electric connector containing the cable.
3. Adequate precautions must be taken to prevent danger arising from the charging of
the intrinsically safe circuit by the contact leakage or inductance from any other circuit.
To prevent static electricity do not rub cables or amplifier housing with a dry piece of
cloth.
4. The intrinsically safe circuit must be adequately insulated from earth in the hazardous
area and the insulation of all cabling must be at least 500 V r.m.s.
5. The safety barrier must be placed in a safe area and be mounted within a protective
enclosure with a protection degree, at least equal to IP 20.
6. The cable between the safety barrier and the amplifier should be provided with a cable
shield which is connected to earth at the safety barrier. The impedance between the
safety barrier earth rail and a secure bond to the hull must not exceed 1 ohm.
7. Safe area apparatus must not be supplied from, nor contain, a source of potential with
respect to earth under normal or abnormal conditions exceeding 250V r.m.s. or 250 V
DC.
8. The inductance/resistance ratio, total inductance and total capacitance, of the cable
and the amplifier must not exceed the values stated by the manufacturer of the
approved safety barriers.
9. Prevent impacts on the sensor housing to avoid sparks. Do not mount or dismount the
sensor when there is a hazardous condition in the tank. Be sure the tank is vented and
gas free.
10.Be sure that the amplifier box is dry and clean before the lid is mounted. The four
screws in the lid should be tightened fully.
11.Be sure to order and use sensor cable with the right temperature specification. Check
that the ambient temperature for the entire cable run do not exceed the max limit for
the cable.
12.MAS 2600 contain no repairable parts. Repairing or fixing the circuit or replacing com-
ponents may impact the intrinsic safety.
13.The sensor cable shall remain in one piece from sensor to amplifier box.
Reference is made to manufacturer instructions of safety barriers and to the rules in force
at the time in question concerning intrinsically safe area installation.
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