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Terminal functions:

L1 & L2 supply in and out

connections

+R remote indicator

positive connection

(internal 2.2kΩ

resistance to

positive)

–R remote indicator

negative connection

(internal 2.2kΩ

resistance to

negative)

Operating voltage:

–

28V DC

Communication protocol:

Apollo Discovery 5

–

peak to peak

Quiescent current:

500µA average 750µA peak

Power-up surge current:

1mA

Maximum power-up time:

10s

Alarm current, LED

illuminated:

3.5mA

Remote output

characteristics:

Connects to positive line

through 4.5kΩ (5mA

maximum)

Clean-air analogue value:

23 +4/–0

Alarm level analogue value:

Alarm indicator:

2 red Light Emitting Diodes

(LEDs). Optional remote LED

Electro-magnetic

compatibility:

marked

A copy of the relevant

declaration is available on

request

Temperature range:

Max. continuous

operating +60°C

Min. continuous

operating 0° C

Min. operating

–

20°C

(no condensation/icing)

Storage

–

30°C to +80°C

Humidity:

0 to 95% relative humidity

(no condensation)

Effect of temperature:

Less than 10% change in

sensitivity over rated range

SAFETY NOTE

In the United Kingdom,

ionisation smoke detectors

are subject to the

requirements of the

Radioactive Substances Act

1960 and to the Ionising

Radiations Regulations

1985 made under the

provisions of the Health and

Safety at Work Act 1974.

The detectors,

independently tested by the

National Radiological

Protection Board (NRPB),

conform to all the

Effect of atmospheric

pressure:

Less than 15% change in

sensitivity up to 2000m

Effect of wind:

Less than 20% change in

sensitivity at speeds up to

10m/s.

Note: slow changes in

ambient conditions will

automatically be compensated

and will not affect sensitivity

Vibration, Impact and

Shock:

To EN54

–

7:2000

IP rating:

Dimensions:

100mm diameter;

42mm height

50mm (height in base)

Weight:

Detector 105g

Detector in base 160g

Materials:

Housing: White

polycarbonate V

–

0 rated to

UL94

Terminals: Nickel plated

stainless steel

requirements specified in

the ‘Recommendations for

ionisation smoke detectors

in implementation of

radiation standards’

published by the Nuclear

Energy Agency of the

Organisation for Economic

Co-operation and

Development (OECD) 1977.

There is no limit to the

number of ionisation smoke

detectors which may be

installed in any fire

protection system.

Storage regulations depend

on local standards and

legislation, but, in the UK,

up to 500 detectors may be

stored in any premises,

Guidance on storage and

handling can be given by

Apollo Fire Detectors and

full details can be requested

from:

Radioactive Substances

Regulation Function

Environment Agency

Rio House, Waterside Drive

Aztec West, Almondsbury

Bristol BS32 4UD.

Outside the UK, please

contact the relevant

national agency.

TECHNICAL DATA

Discovery Ionisation Smoke

Detector

Part No 58000-500

Specifications are typical at

24V, 23°C and 50% relative

humidity unless otherwise

stated.

Detection principle:

Ionisation chamber

Chamber configuration:

Twin compensating

chambers using one single

sided ionising radiation

source

Radioactive isotope:

Americium 241

Activity:

33.3 kBq, 0.9µCi

Type code:

Bits 2 1 0 4 3 7 6 5

0 1 1 0 0 0 0 0

Supply wiring:

Two-wire supply, polarity

insensitive

although there are

stipulations on storage

facilities if more than 100

ionisation detectors are

stored in one building.

At the end of their

recommended working life

of ten years, ionisation

smoke detectors should be

returned to Apollo for safe

disposal or disposed of in an

otherwise locally approved

and environmentally safe

manner. Please see

"A guide to the care,

maintenance and servicing

of Apollo products",

PP2055.

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