Siemens DF-30 Manuel du propriétaire

Models DF-30/30A Flame Detectors

Fire Safety

Siemens Building Technologies, Inc.

8 Fernwood Road

Florham Park, New Jersey 0 932

Siemens Building Technologies, Ltd.

2 Kenview Boulevard

Brampton, Ontario L6T 5E4 CN

P/N 315-092604-4

INSTALLATION, APPLICATION,

AND TECHNICAL INSTRUCTIONS

INTRODUCTION

The SIEMENS DF-30 and DF-30A detectors (See Figure 1) are

plug-in, two-wire flame detectors which respond to ultra iolet radia-

tion. The detectors use an ultra iolet sensiti e gas filled tube to see

a flame.

When acti ated, the DF-30 has a 5-second delay before alarm; the

DF-30A delays 10 seconds before alarm. If the acti ating radiation

is not sustained for the delay period, the detector sees it as an inci-

dental light (not a fire) and does not alarm.

Figure 1

DF-30 and DF-30A Detector

DF-30 detectors are designed to protect hazards where an antici-

pated fire will de elop quickly with little or no incipient (smoldering)

stage where ignition is irtually instantaneous (e.g., flammable

liquids, combustible gases, etc.).

The DF-30 detectors use a low profile surface mounting base,

Model DB-3S. Each base may be attached to either a 4-inch

octagonal or square electrical box or a single gang switchbox. The

DB-3S base uses screw/clamp terminals for all electrical connec-

tions, self-wiping contacts for reliability, and contains pro isions for

an optional concealed locking mechanism to pre ent unauthorized

remo al.

The DF-30 detectors are capable of operating one remote alarm

indicator or auxiliary relay. These detectors are protected by a

rectifier against input polarity re ersal of the supply lines.

DETECTOR OPERATION

The DF-30 detectors use an ultra iolet sensiti e gas filled tube

which operates on the Geiger-Mueller principle. This tube con-

sists of an anode and a cathode sensiti e to ultra iolet wa e

lengths of 1850 to 2600 Angstroms. Both electrodes are energized

by the high oltage generated within the detector from the low olt-

age which is applied to the detector.

When ultra iolet rays (photons) reach the cathode, it ionizes the

gas molecules, causing them to emit electrons. As the number of

ionized particles increases, an electrical current flows between

the electrodes. In this way, the ultra iolet rays generate a pulsed

electrical signal which is digitally counted. If the signal is still pre-

sent when the counting delay cycle is complete, the detector

locks into alarm and must be reset at the control panel by inter-

rupting the power.

The DF-30s are designed to respond in 5 seconds to an 8W

Halogen lamp directly in the line-of-sight at a distance of 50 cen-

timeters. The DF-30As respond in 10 seconds to the same source.

TECHNICAL DATA

Detector Type Ultraviolet

Wave Length Response 1850- 600 Angstroms

(185- 60 nm)

Vision Angle (effective) 50° minimum

100° maximum

Input Voltage 19 VDC to 4 VDC

Quiescent Current

(Non-alarm) 500µA maximum at 1±3 VDC

Alarm Current 65mA typical

Inrush Current 3mA maximum for 50 msec

Alarm Indicator Internal red LED is on steady

when detector is in alarm.

Alarm Processed by System 3. Must be

reset at the control panel.

Remote Alarm Indicator Connection available. Indicator

blinks every 3 seconds. Total

current of 100mA maximum must

be limited by the control panel and

DF-30 design.

Auxiliary Relay Model RR-3: DPDT, 1 0 VAC, A.

Total current 90mA maximum must

be limited by the control panel and

DF-30 design.

Temperature Application

Range +14° F (-10°C) to + 1 °F (+50°C)

Relative Humidity

Application Range 0 to 90%

Pressure Application

Range (Tested) 460 to 1060 mm water

Response Time

(Alarm activation delay) 5 sec (DF-30), 10 sec (DF-30A)

Sensitivity Factory set

Installation Surface mount

TECHNICAL DATA (continued)

Electrical Connection Through base with screw/clamp

terminals

Physical Size 5e in (143 mm) width

(See Figure 1)

Electrical Wiring Two-wire 18 AWG thermoplastic

in conduit. 18 AWG limited energy

shield cable

Weight 1 pound (45 kilograms)

Maximum detectors per

circuit (ZN-30 or ZU-35) 5 detectors

APPLICATION DATA

Flame detectors are essentially line-of-sight devices. That is, the

detector must be mounted where it can see the flame directly.

Pay particular attention to blind spots, such as intervening struc-

tural beams and columns, ducts, chutes, or belts. Any other

opaque objects or materials  including heavy personnel traffic

 must also be considered.

In hazards which include conveyor belts, the line-of-sight of the

detector must clear not only the belt, but a full conveyor load as

well.

Among the materials that are opaque (non-transmitting) to ultra-

violet radiation are ordinary glass and transparent plastics.

The DF-30 detector alarms after a 5-second view of a flame of

sufficient intensity and should be used in hazards where a fast

response is necessary, such as volatile material handling areas,

and where there are no other sources of ultraviolet rays which

may cause false alarms. The DF-30A responds after a 10-second

exposure to flame (at the design intensity) and can be used in

hazards where the fire is expected to develop at a slower rate.

Signal interference substances that must be considered are UV

absorbing gases and vapors. Ammonia is such a vapor, but others

of more importance in the industrial environment are toluene,

ethylene, and similar sol ents. Therefore, when considering

protection of equipment where paint is in use, be sure to con-

sider the concentrations of the sol ents present.

RELATIVE SENSITIVITY

(Refer to Figure )

When installing the DF-30 detectors, the relative sensitivity should be

considered. The detector sensitivity varies from 80 to 100% of the

design sensitivity depending on the angle of the flame. Figure

shows maximum sensitivity.

Figure 2

Directional Sensitivity

INSTALLATION

Install the detectors in accordance with NFPA guidelines and local

codes.

DETECTOR PLACEMENT

Mount flame detectors in locations where ultraviolet rays from sources

other than a fire will not cause false alarms.

Be careful to prevent structural reflecting materials, such as glass and

metal, from reflecting nuisance ultraviolet rays from areas which are

otherwise out of the detectors line-of-sight.

Common sources of ultraviolet radiation which can cause an un-

wanted alarm include the electrical energy arc associated with:

Welding

Heavy duty circuitbreakers

High voltage discharges from transformers, power lines, etc.

Gas burners (Ignitors)

Where necessary, shield the detectors from these sources of UV

energy to prevent unwanted alarms.

Conduct an analysis of the hazard to determine the most probable sources

of flame. Then install the detectors at a point which provides:

1. The most direct line-of-sight.

. The required angle for optimum sensitivity.

3. Shielding from sources of unwanted alarm.

Review the overall situation of the hazard frequently to assure that

changes in structural or usage conditions have not blocked the view

of the detectors. Such changes must be avoided and/or promptly

remedied.

ENVIRONMENTAL EFFECTS

The sensitivity of the DF-30 detectors is essentially unaffected by the

environmental factors of temperature, atmospheric pressure, humidity,

and supply voltage.

The variations in detector performance with changes in these condi-

tions were tested within the ranges given in the TECHNICAL DATA

section and are negligible.

DETECTOR WIRING

Connect the detector as shown in Figure 3, and wire to the control

panel following the wiring connection drawing installed or referenced

on each control panel. Duplicate wiring information is also contained

in the Installation, Operation, and Maintenance Manual provided with

every control panel.

A maximum of five DF-30 detectors may be connected on a single

circuit (such as ZN-30 or ZU-35). The detector requires a two-wire

circuit of 18 AWG thermoplastic fixture wire enclosed in conduit, or 18

AWG limited energy shielded cable without conduit, if permitted by

local building codes.

CAUTION: Do not use looped wire under terminal 5. Break wire run to provide supervision of connection.

End-of-line

device capacitor,

50 MFD, 50 VDC

/N 100-115588

NOTE: A maximum of five DF-30

Connect for listed remote and/or DF-30A detectors can be

lamp or relay. 40mA max connected on a single circuit

at 24V (1 per detector) ( ZN-30 or ZU-35)

1a 1b 1b

5 6 5 6

Figure 3

Installation/Wiring Diagram

To initiating circuit of

Siemens Building

Technologies, Inc.

System 3 Control anel

DETECTOR MOUNTING

The detector comes with a separate base which attaches to a

standard 4-inch square or octagonal electrical box or a single gang

switchbox, with the box size and depth required by the National

Electrical Code for the number and size of conduit used.

NOTE: When using a remote relay, a 4-inch square, deep electrical

box must be used.

Connect the base as described in the Installation Instructions,

P/N 315-083 5, provided with the base assembly.

INSTALLATION OF DETECTOR HEAD

1. Align notch in detector cover to raised surface on outer ring of

base. Refer to Figure 4.

. Push detector head into base and rotate clockwise to make the

electrical connections. The detec-

tor automatically stops and locks

into place.

3. To remove the detector head, push

it up into the base while rotating

the detector head counterclock-

wise until a stop is reached. Then

pull downward to separate from

base.

Figure 4

MAINTENANCE

Clean the dust from the detector head by using the suction of a

vacuum cleaner. Disconnect the power during cleaning. Clean the

detector at least every 6 months depending on the detector envi-

ronment and NFPA Standard 7 National Fire Alarm Code, Chapter 5

and CAN/ULC-S5 4.

Contamination of the detector window could prevent the entry of

radiation, and thus prevent operation of the detector. The detector

viewing surface should be carefuliy cleaned as necessary, using

rubbing alcohol and a soft nonabrasive cloth.

UNDER NO CIRCUMSTANCES IS THE DETECTOR HEAD TO

BE DISASSEMBLED. DO NOT ATTEMPT FIELD REPAIRS.

THE DETECTOR IS FACTORY REPAIRABLE ONLY.

P/N 315-092604-4

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