Ravel RE - 104 Spécifications télécharger pdf (Page 8)

Man-1078_Sigma_CP_22

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3B4. Using intrinsically safe barriers

SIGMA CP control panels support the use of I.S. barriers for connecting to equipment in hazardous areas.

Only certified detectors, call points and sounders may be used in hazardous areas and these

must be connected to the control panel via a compatible I.S. barrier as listed in table 7.

Connection of the I.S. barrier changes the characteristics of the detection circuit so zones that have I.S.

barriers connected must be adjusted to work with them.

Programmable options C61 to C68 allow each zone to operate with I.S. barriers.

The amount of detectors and call points that can be connected to a zone is limited by the I.S. approval

system diagram which should be supplied by the detector manufacturer. The power rating of the end of line

resistor will be dependent upon the Zone classification rating (Gas class) this will be specified on the system

diagram.

Figure 1. Detection zone wiring through an MTL5561 I.S .barrier

SOUNDER

OUTPUT

I.S .

POLARISED

SOUNDER

K END OF LINE RESISTOR

MTL7778ac

MAXIMUM OF TWO SOUNDERS PER SOUNDER CIRCUIT

I.S.

EARTH

POWER WILL DEPEND UPON

I.S. ZONE CLASSIFICATION

HAZARDOUS AREASAFE AREA

OUT

I.S .

POLARISED

SOUNDER

OUT

Figure 2. Sounder circuit wiring through an MTL7778ac I.S. barrier

ZONE

OUT

I.S. DETECTOR

I.S . CALL POINT

MTL5561

6K8 END OF

LINE RESISTOR

SAFE AREA HAZARDOUS AREA

POWER RATING WILL

DEPEND UPON I.S. ZONE

CLASSIFICATION

NOTE: Active End of

Line Devices (LCMU)

must not be used in

the Hazardous Area

MAXIMUM NUMBER OF DEVICES ON ZONE

SPECIFIED IN SYSTEM DIAGRAM

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 23 24

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