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INSTALLATION, APPLICATION,
AND TECHNICAL INSTRUCTIONS
Models DF-30/30A Flame Detectors
Fire Safety
Siemens Building Technologies, Inc.
8 Fernwood Road
Florham Park, New Jersey 07932
P/N 315-092604-4
Siemens Building Technologies, Ltd.
2 Kenview Boulevard
Brampton, Ontario L6T 5E4 CN
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INTRODUCTION
The SIEMENS DF-30 and DF-30A detectors (See Figure 1) are
plug-in, two-wire flame detectors which respond to ultraviolet radiation. The detectors use an ultraviolet sensitive gas filled tube to see
a flame.
When activated, the DF-30 has a 5-second delay before alarm; the
DF-30A delays 10 seconds before alarm. If the activating radiation
is not sustained for the delay period, the detector sees it as an incidental light (not a fire) and does not alarm.
Figure 1
DF-30 and DF-30A Detector
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DF-30 detectors are designed to protect hazards where an anticipated fire will develop quickly with little or no incipient (smoldering)
stage where ignition is virtually 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 connections, self-wiping contacts for reliability, and contains provisions for
an optional concealed locking mechanism to prevent unauthorized
removal.
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 reversal of the supply lines.
DETECTOR OPERATION
The DF-30 detectors use an ultraviolet sensitive gas filled tube
which operates on the Geiger-Mueller principle. This tube consists of an anode and a cathode sensitive to ultraviolet wave
lengths of 1850 to 2600 Angstroms. Both electrodes are energized
by the high voltage generated within the detector from the low voltage which is applied to the detector.
When ultraviolet 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 ultraviolet rays generate a pulsed
electrical signal which is digitally counted. If the signal is still present when the counting delay cycle is complete, the detector
locks into alarm and must be reset at the control panel by interrupting 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 centimeters. The DF-30As respond in 10 seconds to the same source.
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TECHNICAL DATA
Detector Type Ultraviolet
Wave Length Response 1850-2600 Angstroms
(185-260 nm)
Vision Angle (effective) 50° minimum
100° maximum
Input Voltage 19 VDC to 24 VDC
Quiescent Current
(Non-alarm) 500µA maximum at 21±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, 120 VAC, 2A.
Total current 90mA maximum must
be limited by the control panel and
DF-30 design.
Temperature Application
Range +14° F (-10°C) to + 122°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
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TECHNICAL DATA (continued)
Electrical Connection Through base with screw/clamp
terminals
Physical Size 5
Electrical Wiring Two-wire 18 AWG thermoplastic
Weight 1 pound (45 kilograms)
Maximum detectors per
circuit (ZN-30 or ZU-35) 5 detectors
e in (143 mm) width
(See Figure 1)
in conduit. 18 AWG limited energy
shield cable
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 structural 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 ultraviolet 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 solvents. Therefore, when considering
protection of equipment where paint is in use, be sure to consider the concentrations of the solvents present.
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RELATIVE SENSITIVITY
(Refer to Figure 2)
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 2
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 detectors line-of-sight.
Common sources of ultraviolet radiation which can cause an unwanted 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.
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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.
2. 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 conditions 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.
To initiating circuit of
End-of-line
Siemens Building
device capacitor,
Technologies, Inc.
System 3 Control Panel
5 6
1b
1a
P/N 100-115588
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)
5 6
50 MFD, 50 VDC
1b
1a
NOTE: A maximum of five DF-30
Figure 3
Installation/Wiring Diagram
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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 315-083225, 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.
2. Push detector head into base and rotate clockwise to make the
electrical connections. The detector automatically stops and locks
into place.
3. To remove the detector head, push
it up into the base while rotating
the detector head counterclockwise 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 environment and NFPA Standard 72 National Fire Alarm Code, Chapter 5
and CAN/ULC-S524.
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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