Autronica BS-100, BX-40 Technical Documentation Manual

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Technical Documentation: Fire Detectors used in hazardous areas

Technical Documentation

Fire Detectors

used in hazardous areas

Analogue Addressable system type BS-100

with zener barrier unit type BZ-32

Conventional system type BX-40

with zener barrier type BZ-20S

P-DET/Ex/RCE

Autronica Fire and Security AS

N-7483 Trondheim. Phone: +47 73 58 25 00, fax: +47 73 58 25 01

Autronica Industrial Ltd., Watford, England

Phone: 1923 23 37 68, fax: 1923 22 55 77.

Oil & GAs AS, Stavanger, Norway

Phone: +47 51 84 09 00, fax: +47 51 84 09 49

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Technical Documentation: Fire Detectors used in hazardous areas

Table of contents:

Abbreviation, related to fire equipment in ex-area 3

1 General part 4

1.1 Danger of explosion 4 The triangle of explosion 5

1.2 Ex-classifications 6

1.3 Labelling electrical equipment 9

1.4 Limiting temperatures 10

1.5 Installing fire alarm equipment in hazardous area 11

1.6 Installation of Autronica fire alarm systems in hazardous areas 11

1.7 Rules regarding potential equalization, PE, to fire detectors in hazardous areas 13

1.8 Potential equalizations: PE on ships 14

1.9 Installation data - 15 Limitations w.r.t capacitance in cable and detectors/call-points connected to zener barrier type Z667/Ex (part of zener barrier BZ-20/S and BZ-32)

2 Analogue addressable system type BS-100 16

2.1 Zener barrier unit type BZ-32 16

2.2 BZ-32, connection diagram, drawing BZ-049 (BZ-047) 17

2.3 BZ-32, functional description, drawing BZ-044 18

3 Conventional system type BX-40 24

3.1 Zener barrier unit type BZ-20/S 24

3.2 BZ-20/S, connection diagram, drawing BZ-076 (BZ-078) 25

3.3 Arranging Ex-loop 25

3.4 BZ-20/S, functional description, drawing BZ-053 25

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Technical Documentation: Fire Detectors used in hazardous areas

Abbreviation, related to fire alarm equipment in Ex area.

Abbreviation: Explanation.

ANSI : American National Standard Institute.

BASEEFA: British Approvals Service for Electrical Equipment

CENELEC: European Commitee for Electrotechnical Standardization.

DNV: (Det Norske Verital) Norwegian Approval Institute.

EEx: Explosion protection to European standards.

EN: Norms edited by CENELEC.

FM: Factory Mutual (USA).

IEC: International Electrotechnical Commission

ESBN: International Standard Book Number.

NEC: National Electrical Code (USA).

NEK: (Norsk Elektroteknisk Komite)

in Flammable Atmospheres.

(Prototype for EN-norms).

Norwegian Electrotechnical Commitee.

NEMKO: (Norsk Elektrisk Materiellkontroll)

Norwegian Electrical Material Control.

NFPA: National Fire Protection Association (USA).

PA/PE: Equipotential terminal.

PTB: West German Approval Organization

(Physikalisch Technische Bundesanstalt).

VDE: West German Approval Organization

(Verband Deutcher Elektrotechniker).

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Technical Documentation: Fire Detectors used in hazardous areas

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General part

Danger of explosion

1 General part

1.1 Danger of explosion.

An explosion is a very rapid combustion, depending on the access of oxygen. More oxygen accelerate the combustion. Some compounds, such as powder and dynamite, has oxygen "baked" into the substance.

This description is concerning hazardous gases, and different ways of preventing these from exploding.

The emphasis is to prevent electrical energy from getting access to the hazardous area in an amount big enough to trigger a fire and consequently an explosion.

Three ingredients are necessary to perform an explosion. These three ingredients are: Explosive gas, oxygen (air) and igniting energy.

If one of these ingredients is missing, completely or partly, an explosion can not take place. The curve below shows how these ingredients affect the hazard of explosion. Specially observe that for gas/air mixtures a value exist where minimum igniting energy is necessary for an explosion to take place. Both more and less concentrate mixtures will need more igniting energy to get the gas exploding. To strong, and too weak concentrations are not exploding.

Igniting energy

2345678901

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0 ...............................................% gas.............................................. 100

100 ..............................................% Air..................................................0

Igniting energy necessary for explosion.

To weak mixture

Minimum igniting energy

Too strong mixture

234567890123456

Technical Documentation: Fire Detectors used in hazardous areas

The triangle of explosion.

oxygen

igniting energy

oxygen gas

oxygen

igniting energy

The equilateral, big triangle, may be considered to represent a case with optimum gas/oxygen relation, i.e. minimum ignition energy is required to trigger an explosion. If the ignition energy is high enough, an explosion will take place.

gas

igniting energy

gas

oxygen

gas

igniting energy

The small triangle to the left has the same values of oxygen and igniting energy as in the equilateral, big triangle, but the content of gas is too small to perform an explosion. I.e. the gas/air mixture is too weak for an explosion to take place.

The remaining two small triangles should be self-explaining, showing the cases with too low igniting energy and too little oxygen respectively.

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Technical Documentation: Fire Detectors used in hazardous areas

Ex-

classifications

1.2 Ex-classifications

The risk of explosion is different for different gas types and areas where the gas is expected to be present. Therefore classifications of gases into Groups and areas into Zones are necessary.

Group classification is concerning the type of gas which is (or is expected to be) present in the hazardous area. Two criteria are of value when the gas is to be classified.

a) The gas grade of explosion hazard, and b) The ignition energy necessary to make the gas explode.

Zone classification is, as the name indicates, based upon the zones surrounding the gas source.

Classifications are indicated by type description. The example below shows the type: Exib/IIC, which is, by the way, the claims Autronica set to the products used in hazardous areas.

Ex - means that the equipment is intended for use in hazardous area.

(EEx is European standard)

i - means that the equipment is intrinsically safe.

b - means that the equipment must be used in zone 1 or 2.

(a - is zone 0, 1 and 2)

II - means that the equipment is intended for group II, which covers

nearly all purposes. (Group I is Mining Industry, mainly).

C - means that the equipment is build to withstand the most extreme

claims with respect to safety. (Ignition energy less than 20 µ - joule and surface temperature less than 85°C).

The drawing below shows the distribution of zones around gas sources. The right illustration shows a simple concentric arrangement, while the left one illustrates a tank under loading or unloading. The expansion of zones 1 and 2 along the base is due to the fact that the gas has a higher density than the air.

In most of the industry buildings where danger of explosion exist, the main part of the hazardous area is characterised as Zone 2.

Note that USA and Canada have different zone classification, such that their "Division 1" covers Zone 0 and Zone 1. "Division 2" covers Zone 2.

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Technical Documentation: Fire Detectors used in hazardous areas

The table below shows the different forms of protection against gas explosion, in abbreviations and explanations. The latter is presented in the plain languages most used by Autronica personnel, handling fire alarm problems.

Plain language explanation in:

Abbreviation Norwegian English German

Exd Eksplosjonssikker Flame proof Druckfeste Kapselung

utførelse

Exe Tennsikker utførelse Increased safety Erhöhte sicherheit Exm Innstøpt utførelse Moulded Vergusskapselung Exn Utstyr for sone 2 Equipment for

Zone 2.

Exs Spesialutførelse Special construction Sonderschutz

Exi Egensikker utførelse Intrinsically safe Eigensichere Exia Sone 0, 1 og 2 Zone 0, 1 and 2 Betribsmittel

Exib Sone 1 og 2 Zone 1 and 2

Exp Overtrykkskapsling Pressurized enclosure Überdruckkapselung Exo Oljefylt Oil immersed Ölkapselung Exq Sandfylt Sand filled Sandkapselung

Note that all Ex-determinations, except Exi, Exia, and Exib are concerning apparatuses.

Intrinsic safety. (Concerns circuits, which may include several apparatuses). Intrinsically safe equipment has limited supply of electrical energy, so that any spark created has too low energy to ignite the gas. Also no part of the equipment surface shall be able to reach a temperature greater than the igniting temperature of the gas. (Which is, or may be expected to be present.) In order to be able to perform this energy limitation, energy barriers are necessary to limit the supply of electrical energy to the hazardous area. Such energy barriers are built up by means of zener diodes, and therefore they are given the name Zenerbarriers.

Exi-equipments are arranged in two main groups, Group I and Group II. The latter, which is the one being concerned in this description is again divided in three parts, namely: Group IIA, Group IIB, and Group IIC. (Group I is concerning Mining Industry, mainly). Equipment may, of course, be used for less hazardous area than what it is built for.

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Technical Documentation: Fire Detectors used in hazardous areas

The table below shows the relation between temperature grades, equipment surface temperature, and gas ignition temperature.

Temperature grades T1 T2 T3 T4 T5 T6

Max. surface temperature °C 450 300 200 135 100 85

Gas min. ignition temperature °C 450 300 200 135 100 85

Note that maximum surface temperature must not, at any occasion (even with fault) exceed the igniting temperature of the actual gas.

The table below shows the relationship between different gas groups and allowed igniting energy.

Gas-group IIA IIB IIC

Igniting Energy in µ Joule 200 60 20

NOTE that values given for igniting energy are limits, and therefore safety factors must be introduced. Values may be selected from the CENELEC norm EN-50020.

In order to calculate igniting energy, the following two equations are actual:

Energy stored in a capacitor (capacitance) is: EC = ½ C U

Energy stored in a coil (inductance) is: EL = ½ L I

Where: EC and EL are energies in Joules.

C is capacitance in Farads. U is voltage in Volts. L is inductance in Henry. I is current in Ampere.

Note that wires represents both capacitance and inductance, and this phenomena must be taken into consideration for long wire installations at the hazardous side of zenerbarriers.

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Technical Documentation: Fire Detectors used in hazardous areas

1.3 Labelling electrical equipment

Electrical equipment intended for use in hazardous area, shall be properly labelled in accordance with claims brought forward by national or international authorities.

The label shall, according to, e.g. EN-50020, contain the symbol Ex, the form of protection (see table page 7, Abbreviation) e.g. "i", gas group (see table page 8) e.g. "IIB", and eventually the class of temperature e.g. "T3". This is true if the maximum ambient temperature is diverging from + 40°C.

The label also shall show the name or logo of test- and approving institution and test approval statement.

For small electrical equipment, with limited space, reduced labelling may be accepted. The label shall then include: The symbol Ex, name of Test institution (test approval), and Manufacturer.

Description: Labelling code:

Approval sign for apparatus certified by an institution within the European Common Market, EC: Ex EEx i a/b IIB T3

Sign indicating that the equipment is produced according to The European Norm (EN) EEx means: "Explosion protection to

European standards"

Intrinsically safe performance; ia or ib (see page 6)

ia: withstands 2 faults with safety factor = 1

or 1 fault with safety factor = 1,5

ib: withstands 1 fault with safety factor = 1,5

or 1 fault with safety factor = 1 and no unprotected conductor

Group: IIA, IIB or IIC (see page 8)

Temperature class: T1, T2, T3, T4, T5 or T6 (see page 8)

This example is made according to the CENELEC norm.

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Technical Documentation: Fire Detectors used in hazardous areas

1.4 Limiting temperatures

The table shows limiting temperatures for electrical equipment which may be mounted in hazardous area, according to regulations made by IEC, VDE and NEC. The temperature limits are valid for parts of the equipment, and for every possible condition.

Classification Classification Classification according to: according to: according to:

IEC/CENELEC VDE 170/0171/2.61 NEC(USA/Canada) Igniting temperature Temp. Temp. Igniting Max. Max. Temp. Gas for gases class limit group temp. temp. identi- igniting

°C °C °C °C fication temp.

Contin- Short ously term

450 T1 450 G1 T1 450 300 T2 300 360 400 T2 300

G2 270 T2B 260

240 T2C 230

200 T3 200 T3 200

180 T3A 180

G3 T3B 165

160 T3C 160

135 T4 135 T4 135

G4 125 T4A 120

110 100 T5 100 G5 90 T5 100 85 T6 85 80 T6 85

T2A 280

T2D 215

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Technical Documentation: Fire Detectors used in hazardous areas

Installation fire

alarm equipment

in hazardous area

1.5 Installation fire alarm equipment in hazardous area.

This description can not, of course, include every possible installation of electrical equipment in hazardous area.

Therefore, the most common rules are mentioned below:

In power distribution systems with earthed zero terminal, the earth wire and the zero terminal shall be kept insulated inside hazardous area. A common earthand zero wire (PEN-wire) is not allowed.

Comment:

Common earth- and zero-wire (PEN-wire) may be utilized for that part of the distribution network outside the hazardous area.

Distribution systems with insulated zero wire must have an earth fault operating switch breaking the circuit at a current of 500 mA, or have facility which by audible or visible signal gives warning of earth fault in the system. When an earth fault is given, the fault must be repaired immediately.

Earth wire must physically be situated in the same tube as the feeding wires. (Separate earth wires are not accepted.)

Comment:

The claims do not exclude use of separate earth wire as equipotential connection in addition to common safety earth wire. Such equipotential connection ought to be used for special exposed system parts, e.g. construction elements of electrically conducting material, pipes etc. in order to avoid potential difference and consequently danger of electrostatic charges.

Installation of

Autronica

fire alarm in

hazardous area

In addition to the comments above, it must be mentioned that the term equipotential connection is differently abbreviated in different documents, such that PA-, PE-, a.o.

In this document the term PE- is preferred.

1.6 Installation of Autronica fire alarm systems in hazardous areas.

Several approval authorities have more or less equal norms to be the recommending and normgiving authorities respectively. But we must recommend you to obtain the laws and regulations concerning your country, because slightly different rules exists in different countries.

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Technical Documentation: Fire Detectors used in hazardous areas

In this description the part regarding installation will be confined to our zener barrier unit type BZ-32, mainly. This unit is built up by means of AC-zener barrier as main component. The advantage of using this ac-barrier is explained by the two sketches, and the associated description below:

Zener barrier type Z667/Ex

Fig. 1 Fig. 2

Positive barrier

Negative barrier

Resistor

Zener diodes

ZD1

ZD7

ZD4

Zener diodes

ZD2

ZD8 ZD9

ZD5

ZD3

ZD6

Fuse

Diagram fig.1 shows the connection of two zener barriers, one positive and one negative, confining one zener barrier unit. This unit has been used for our fire alarm detector lines (loops).

With no fault the arrangement is perfect, without any trouble. The PE- terminal will then, electrically viewed, be situated midway between minus (-) and plus (+), at the same potential as the earth terminal in the panel, approximately. The PE-terminal and the panel's earth terminal must be connected together (outside the hazardous area), and therefore an earth indication will be given by the panel, if the PE-terminal is connected to minus (or plus). When the detector line is disconnected by shorting the plus- and minus-wires (as in the BS-systems) trouble will be introduced because then the zener barrier Z1 and Z2 will connect the PE-terminal to minus.

Considering the same situation with ac-barriers (see fig. 2), it is easily shown that the zener diodes ZD7, ZD8 and ZD9 will prevent the PE-terminal from being connected to minus.

Data for zener barrier type Z667/Ex

Nominal Type Max. end to end Working voltage Max. voltage Fuse Charact- no. resistance at 10mA leakage rating eristics mA

18V 120W Z667/Ex 135.4W 14.5V 16.5V 50 18V 120W 135.4W 14.5V 16.5V 50

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Technical Documentation: Fire Detectors used in hazardous areas

Rules regarding

potential

equalization, PE,

to fire detectors in

hazardous areas

1.7 Rules regarding potential equalization, PE, to fire detectors in hazardous areas.

To avoid sparks between an intrinsically safe circuit and the surroundings the use of a Potential Equalization is required. Normally this is done by a PE- conductor grounded at the zener barrier.

We differ between insulated detectors (plastic housing) and detectors in

conducting metal housing.

Detectors in plastic housing are non-conducting.

We also differ between conducting and non-conducting surface for mounting.

For insulated detectors the following applies:

The PE-conductor shall only pass through.

Some detectors and junction boxes have separate, insulated terminals for the PE-conductor. Some detectors have no special terminal for the purpose, and the connections for continuity must be provided by the installer. This applies when mounted on both conducting and non-conducting surface.

For detectors in conducting metal housings the following applies:

When mounted on non-conducting surface , e.g. concrete the PE-conductor

shall be connected to the inside of the housing.

Special terminal screws are provided.

When mounted on conducting surface, the PE-conductor shall be connected

to the inside of the housing. The outside earth terminal screw shall be connected to the surface.

A special case is when mounted in all welded steel ships. According to classification societies (e.g. Det Norske Veritas) the hull itself can be regarded as a PE-conductor, and PE-cabelling can be omitted. Detectors in conducting metal housings must have good connection to the hull.

If a screened cable is used, the screen can not be used as a PE-conductor.

The screen shall continously pass through all detectors and shall be grounded at the zener barrier only.

Earthing of the zenerbarriere:

Onboard ships:

The earth terminal of the zener barrier unit shall be connected to earth (ships hull) by a cable not less than 4mm

The cable resistance must not exceed 1 Ω.

Onshore:

As there are different regulations for different countries you should check the local regulations. An extract from BS5345 pt. 4 is printed here as an example:

"....to preserve the integrity of an intrinsically safe system (e.g. a diode safety

barrier earth, a transformer screen earth, a barrier relay frame earth) such connections should be made to a high integrity earth in such a way as to ensure that the impedance from the point of connection to the main power system earth point is less than 1 Ω. This may be achieved by connection to a switch room or simular earth bar or by the use of separate earth rods. The conductor used for the connection should be equivalent to a copper conductor of 4 mm2 minimum cross-sectional area.

"The conductor used for the earth connection should be insulated to prevent invasion of the earth by fault currents which might flow in metallic parts with which the conductor should otherwise come into contact (e.g. control panel frames etc.). It should also be given mechanical protection in places where the risk of damage is high."

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Technical Documentation: Fire Detectors used in hazardous areas

1.8 Potential equalizations: PE on ships.

Zenerbarrier A B C D

Conducting wall etc.

A: Insulated sensor on non conducting wall:

PE-conductor only passing through.

B: Insulated sensor on conducting wall:

PE-conductor only passing through.

C: Metal sensor on conducting wall:

PE-conductor connected to inside of box. Outside earth screw connected to wall.

D: Metal sensor on non conducting wall:

PE-conductor connected to box.

For an intrinsically safe circuit the main demands are:

1: Voltage, current and energy has to be below certain values (depending on

gas types), so that any sparks due to shortening or breaking the circuit do not ignite the gas mixture.

This may be achieved by the use of a Zener barrier and restrictions for inductively and capacity.

2: To avoid sparks between the IS circuit and the surrounding the use of a

Potential Equalization is necessary.

Normally this is done by a PE-conductor, grounded at the zener barrier. When disconnected it shall withstand 500 V to ground. In welded steel ships however, according to "Det Norske Veritas", the hull itself may be used as potential equalization conductor.

3: The temperature of any component in an IS-circuit shall be below a given

value, depending on the gas group.

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Technical Documentation: Fire Detectors used in hazardous areas

1.9 INSTALLATION DATA

Limitations w.r.t. capacitance in cable and detectors/call-points connected to zener barrier type Z667/Ex (part of zener barrier units BZ-20/S and BZ-32).

For an intrinsically safe circuit connected to a zener barrier, there is a limitation as to how large a capacitance (C

) the circuit can hold. C

max

danger from explosion.

For zener barrier Z667/Ex, the values are:

for gas group IIC : C for gas group IIB : C for gas group IIA : C

The following parameters apply: The total capacitance in the cable and detectors/call-points shall not exceed C Max. number of units connected to each zenerbarrier in BZ-20 and BZ-32 is 10. The total capacitance in each branch must not exceed C

Cable: Capacitance in cable varies with type, but if the value is unknown, use a value of 200 pF per

metre as maximum.

will vary depending on which gas group is present in the area where there is a

max

= 0.440 µF

max

= 1.32 µF

max

= 3.52 µF

max

Detectors: Equivalent capacitance (Ci /Ceq) is for different detectors/call-points, as set during testing/certifica-

tion by NEMKO.

Group IIA Group IIB Group IIC BD-26/Ex: Ci = 36 nF BD-27/Ex: Ci = 36 nF 10 10 10

BE-30/Ex: Ci = 80 nF 10 10 5 BE-34/Ex: Ci = 80 nF

BH-31A/Ex: Ci = 30 nF 10 10 10 BH-31A/S/Ex: Ci = 30 nF

BJ-20B/Ex: C BJ-31/Ex: C

BF-35/Ex: C BF-32M/Ex C BF-52/Ex: C BF-53/Ex: C

BF-33/Ex: C BF-34/Ex: C

BN-35/Ex: C BN-32M/Ex: C

≤ 0,2 µF10 6 2

≤ 0,2 µF

≤ 10 nF

≤ 10 nF 10 10 10

≤ 10 nF

≤ 0,4 µF 8 3 1

≤ 0,4 µF

≤ 10 nF 10 10 10

≤ 10 nF

The number of detectors / call-points is calculated with a cable of 200 m (200 m x 200 pF).

Notes: 1 µF = 1.000 nF = 1.000.000 pF

E.g. for gas group IIC (C

= 0.440 µF) for a single zener barrier type Z667/Ex.

max

50 m cable (à 200 pF) = 10 nF 2 x BF-35/Ex (à 10 nF) = 20 nF 7 x BH-31A/Ex (à 30 nF) = 210 nF 1 x BJ-31/Ex (à 0.2 µF) = 200 nF

440 nF = 0.440 µF

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Technical Documentation: Fire Detectors used in hazardous areas

Analogue

addressable

system BS-100

Zener barrier

unit type BZ-32

2 Analogue addressable system type BS-100

2.1 Zener barrier unit type BZ-32

Barrier unit BZ-32 is mainly intended to be used together with Autronica addressable fire alarm systems. The main component is one ac-barrier (see page

12) for each branch for connection of detectors in hazardous area.

Each unit may contain from one to four ac-barriers, and may consequently be loaded with the same numbers of branches as the unit contains ac-barriers. Each branch may take up to ten addresses.

The type indication includes the number of acceptable branches, indicated by a digit placed behind a diagonal at end of type indication.

E.g. BZ-32/3 means that the maximum number of branches which may be connected to this unit is 3.

Do remember that the total numbers of addresses at one BS-loop must be limited to 99.

Note!

Units listed below only, may be connected to the zener barrier unit type BZ-32/ n (n being any number from 1 to 4).

Smoke detector, optical type BH-31A/Ex and BH-31A/S/Ex Smoke detector, ion-chamber type BJ-33/Ex (BJ-31/Ex)

Heat detector type BE-30/Ex Heat detector type BE-34/Ex

Manual Call-point type BF-32M/Ex Manual Call-point type BF-33/Ex Manual Call-point type BF-34/Ex Manual Call-point type BF-35/Ex

Interface unit type BN-35/Ex to which heat detector type BD-26/Ex (BE-26/Ex) and heat detector type BD-27/Ex (BE-27/Ex may be connected.

BD-26/Ex (BE-26/Ex) and BD-27/Ex (BE-27/Ex) are conventional heat detectors.

In order to limit the current consumption, none of these units are equipped with alarm indicator (LED).

The four first mentioned detectors may, as described above, be connected to one branch in number of maximum 10 units.

BN-35/Ex or BF-35/Ex must have the highest address numbers on the branch.

This is purely estimated from an electrotechnical point of view. Other criterias to be estimated are gas group and total capacitance, Ceq. See page 15.

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Technical Documentation: Fire Detectors used in hazardous areas

BZ-32,

connection

diagram

2.2 BZ-32, connection diagram, drawing BZ-049A (BZ-047A)

The diagram is separated in two main parts by a dot-dash-line. The components located above that line is mounted in the hazardous area, and must be approved for that purpose. At the projecting period it is important to place as little as possible of the total equipment in the hazardous area.

Detectors which are operating independent of interface unit type BN-35/Ex and are equipped with separate addresses, are marked with capital "D".

Conventional detectors, which need interface unit BN-35/Ex, are marked with small "d" and all these detectors will have the same address number.

Note that, of course, all detectors must be approved for mounting inside hazardous area, i.a. being marked B--/Ex.

Note also that the address number of BNB-35/Ex is given (n + 1) because this unit (or BF-35/Ex) must be given the highest number of that branch.

Units loaded below the dot-dash-line are common Autronica fire alarm equipments. The equipotential line is marked with PE and is connected to terminal marked 4 on the zener barrier unit.

Note that the equipotential terminal, (marked 4 on the ac-barrier unit) must not be connected to the system earth inside hazardous area. These two terminals are, however, shorted inside the ac-barrier unit itself.

On branch no. 1 an interface unit type BNB-35/Ex is shown in detail for both the input terminals "1 + 2" and "3 - 4", and the sub-loop, SL's connection to terminals 5(-) and 6(+). The sub-unit BNB-35/Ex is used for call-point BF-35/Ex and interface unit BN-35/Ex which is the one shown on this drawing. The manual call-point, BF-35/EX, has no possibility for sub-loop connection. (The terminals 5 and 6 are used for the push-button, which is to be manually operated.)

(The highest address number, which on the drawing BZ-049A is given to an analogue addressable detector is "n", and unit BNB-35/Ex is given the address number "n + 1")

Also remember that here must the equation; n ≤ 9 be satisfied.

Zener barrier unit type BZ-32/1 contains 1 unit type Z-667/Ex Zener barrier unit type BZ-32/2 contains 2 units type Z-667/Ex Zener barrier unit type BZ-32/3 contains 3 units type Z-667/Ex Zener barrier unit type BZ-32/4 contains 4 units type Z-667/Ex

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Technical Documentation: Fire Detectors used in hazardous areas

BZ-32

function

description

2.3 BZ-32 functional description, drawing BZ-044C

This diagram shows, in detail, how the current flow in the hazardous area is limited to an acceptable value. On page 12 you will find diagram and description of the barrier Z-667/Ex where the detector line (loop) is represented by a resistor "RS".

The potential equalization terminal is, inside the barrier Z-667/Ex, shorted to the system "earth".

Only one of the four possible branches is illustrated. The other branches, (1 to

3) would have been drawn in an equal manner. The following functional description is referring to branch number one.

The current through the branch is fed from plus (1 + 2), through the emitter base resistor R1, through the barrier Z-667/Ex terminals 21 to 23, through the detectors "D" (which are parallel connected in a numbers of 1 to 10), through the barrier Z-667/Ex terminals 13 to 11, and from there to minus (3 - 4).

The emitter - base resistor R1 is given a value to obtain a suitable voltage drop so the transistor V1 does not conduct if none of the detectors is conducting.

The signal answer current, caused by any of the detectors, will increase the voltage drop across R1, causing transistor V1 to conduct, passing a much greater current through resistor R2. This causes the greater part of the signal current to pass through the transistor and it's collector resistor R2.

In this way the necessary signal current through any of the detectors is limited to a value which is acceptable for consumption inside the hazardous area. (Accepted by the zener barrier's internal resistance.

All (maximum 4) branches are functioning in the same way, and perform signal on the same terminal bloc, X1.

Observe that each detector; D1, D2 etc. to Dn are individually addressed.

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SAFE AREA CONNECTIONS ONLY.

HAZARDOUS AREA CONNECTIONS ONLY.

Technical Documentation: Fire Detectors used in hazardous areas

Merk: Festehull for boks til vegg, og lokk til boks er konsentriske.

For å beholde beskyttelsesgrad, IP55.

Note: In order to maintain encapsulation rating, IP55, mounting

holes for box to wall are concentric to the lid's fixing holes.

BZ-056C

SAFE AREA & HAZARDOUS AREA CABLES MUST BE SEPARATED BY MIN. 50mm INSIDE AND OUTSIDE OF THE HOUSING.

DIMENTIONAL SKETCH ZENER BARRIER UNIT TYPE BZ-32/1-4 UNIT MAY BE MOUNTED IN ANY ORIENTATION.

Technical Documentation: Fire Detectors used in hazardous areas

FUNCTIONAL DIAGRAM ZENER BARRIER UNIT TYPE BZ-32/1-4

BZ-044C

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Technical Documentation: Fire Detectors used in hazardous areas

Max 1Ω

CONNECTION DIAGRAM ZENER BARRIER UNIT TYPE BZ-32/1

BZ-047A

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Technical Documentation: Fire Detectors used in hazardous areas

Max 1Ω

CONNECTION DIAGRAM ZENER BARRIER UNIT TYPE BZ-32/1-4

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BZ-049A

Technical Documentation: Fire Detectors used in hazardous areas

MAN. CALL P. BF-32/Ex

(NON INSULATED UNITS)

NON INSULATED UNITS (METAL HOUSING)

SHALL BE CONNECTED TO THE HULL.

MAN. CALL P. BF-35/Ex

(INSULATED UNITS)

INTERFACE UNIT BN-35/Ex

(INSULATED UNITS)

SMOKE DETECTOR BJ-31/Ex

SMOKE DETECTOR BH-31/Ex

HEAT DETECTOR BE-30/Ex

(INSULATED UNITS)

SUB LOOP

HEAT ETECTOR

BD-26/Ex OR

BD-27/Ex

(INSULATED UNITS)

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Technical Documentation: Fire Detectors used in hazardous areas

Conventional

system type

BX-40

Zener barrier

unit type BZ-20/S

3 Conventional system type BX-40

3.1 Zener barrier unit type BZ-20/S

Barrier unit BZ-20/S is mainly intended to be used together with Autronica conventional fire alarm systems. The main component is one ac-barrier (see page 12) for each branch for connection of detectors in hazardous area.

Each unit may contain one or two ac-barriers, and may consequently be loaded with the same number of loops as the unit contains ac-barriers. Each loop may take up to ten detectors.

The type indication includes the number of acceptable branches, indicated by a digit placed behind a diagonal at end of the indication.

E.g. BZ-20/2S means that the maximum number of loops which may be connected to this unit is 2.

Note!

Units listed below only, may be connected to the zener barrier unit type BZ-20/nS. (n being the number 1 or 2).

Smoke detector, ion-chamber type BJ-20B/Ex

Heat detector type BE-26M/Ex Heat detector type BE-27M/Ex

Manual call-point type BF-21M/Ex

Heat detector type BD-26/Ex (BE-26/Ex) Heat detector type BD-27/Ex (BE-27/Ex)

The detectors may, as described above, be connected to one loop in number of maximum 10 units.

This is purely estimated from an electro-technical point of view. Other criterias to be estimated are gas and total capacitance, Ceq.

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Technical Documentation: Fire Detectors used in hazardous areas

BZ-20/S

Connection

diagram

Arranging

EX-loop

3.2 BZ-20/S, connection diagram, draw. BZ-076 (BZ-078)

The diagram is separated in two main parts by a dot-dash-line. The components located above that line is mounted in the hazardous area, and must be approved for the purpose. At he projecting period it is important to place as little as possible of the total equipment in the hazardous area.

Note that, of course, all detectors must be approved for mounting inside hazardous area, i.e. being marked B--/Ex.

Units located below the dot-dash-line are common Autronica fire alarm equipments. The equipotential line is marked with PE and is connected to terminal marked 4 on the zener barrier unit.

Zener barrier unit type BZ-20/1/S contains 1 unit type Z-667/Ex Zener barrier unit type BZ-20/2/S contains 2 units type Z-667/Ex

3.3 Arranging Ex-loop

One zener barrier for each detector loop in central unit. If none Ex-detector are mixed with Ex-detectors in the same loop, the Exdetector with it's zener barrier must be the very last element at the loop.

BZ-20/S

Function

description

3.4 BZ-20/S, functional description, drawing BZ-053.

From the diagram containing PCB BZA-20/S, it is seen that the terminals B and B' are shorted on terminal strip X1.

The resistors R2 have values which make transistor V1 normally non-conducting . The control (base) current for these transistors passes through the detectors (in parallel, also with the end load) via the zener barrier unit.

Monitoring of the loop is obtained by connecting end load BXY-40/Ex to the last detector.

Fire alarm given by one of the detectors will cause a rise of the transistors base current. V1 will be conducting, causing a much greater current to flow through R1. This latter current indicates fire alarm on the central panel.

P-DET/EX/RCE/PM5/GKa/110995 25 Autronica Fire and Security AS

P-DET/EX/RCE/PM5/GKa/110995 26 Autronica Fire and Security AS

SAFE AREA CONNECTIONS ONLY.

HAZARDOUS AREA CONNECTIONS ONLY.

Technical Documentation: Fire Detectors used in hazardous areas

BZ-056C

Note: In order to maintain encapsulation rating, IP55, mounting

holes for box to wall are concentric to the lid's fixing holes.

SAFE AREA & HAZARDOUS AREA CABLES MUST BE SEPARATED BY MIN. 50mm INSIDE AND OUTSIDE OF THE HOUSING.

DIMENTIONAL SKETCH ZENER BARRIER UNIT TYPE BZ-32/1-4 UNIT MAY BE MOUNTED IN ANY ORIENTATION.

Technical Documentation: Fire Detectors used in hazardous areas

FUNCTIONAL DIAGRAM ZENER BARRIER UNIT TYPE BZ-20/1-2s

BZ-053A

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Technical Documentation: Fire Detectors used in hazardous areas

1 - 6

Max 1W

CONNECTION DIAGRAM ZENER BARRIER UNIT TYPE BZ-20/1S

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BZ-078

Technical Documentation: Fire Detectors used in hazardous areas

1 - 6

Max 1W

CONNECTION DIAGRAM ZENER BARRIER UNIT TYPE BZ-20/2S

BZ-076A

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Technical Documentation: Fire Detectors used in hazardous areas

MAN CALL P. BF-21M/Ex

(NON INSULATED UNITS)

NON INSULATED UNITS (METAL HOUSING)

SHALL BE CONNECTED TO THE HULL.

HEAT DETECTOR

BD-26/Ex

BD-27/Ex

(INSULATED UNITS)

ZENER BARRIER

UNITS BZ-20/S

CONNECTION DIAGRAM FOR FIRE DETECTORS IN

HAZARDOUS AREA (Ex) FOR INSTALLATION IN STEEL

SHIPS. CONVENTIONAL SYSTEM.

A-

B-

P-DET/EX/RCE/PM5/GKa/110995 30 Autronica Fire and Security AS

Autronica BS-100, BX-40 Technical Documentation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual