Notifier 30-2056B User Manual

30-2056B

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Spectral Sensitivity Range for Hydrocarbon Fires

Figure 1

Infrared Flame Detector

General

The Pyrotector Model 30-2056B IR Flame Detector is a
compact, unitized package containing an IR detection cell,
solid state electronics and dry Form-C (SPDT) contacts for
alarm and fault conditions. The detector is engineered to
respond to the nominal 4.45 micron band of infrared radia­tion, which is commonly known as the CO

1. A characteristic of burning hydrocarbons is the emission of
unusually high levels of IR radiation in this narrow portion of
the radiation spectrum. On the other hand, extraneous light
sources that are capable of triggering an alarm in other types
of fire detectors emit very low levels of radiation in this range.
By concentrating on this narrow band of the spectral range
that is highly specific to burning hydrocarbons, combined
with the use of optical filters to discriminate against most
extraneous background radiation from a variety of sources,
including hot objects, the Model 30-2056B is able to provide
a high level of reliable fire detection, while being relatively
immune to false alarm signals.

The detector is compatible with most 24-volt filtered DC four­wire fire alarm control panels.

2 spike. See Figure

DN-5517:B1 • I-208

Conventional Initiating Devices

Features

• High immunity to false alarms caused by lightning, arc
welding, x-rays and sunlight.

• Compatible with standard alarm systems.

• Remote test feature assures reliable response.

• Explosion-proof and watertight housing for use in a variety
of applications.

Application

The Pyrotector Model 30-2056B Infrared Flame Detector is
designed for use in applications where the occurrence of
lightning or arc welding within the protected area can cause
an ultraviolet fire detector to register a false alarm. The
detector is virtually immune to actuation caused by lightning,
arc welding, and most other extraneous light sources. It is
ideally suited for use in a variety of both indoor and outdoor
applications, in nearly any ambient lighting environment,
including the full range of artificial lighting. The housing is
explosion-proof, watertight, and dust-tight, and conforms to
applicable NEMA and NEC requirements. Typical applica­tions that can use the 30-2056B flame detector include:

• Hydrocarbon processing plants.

• Hazardous storage facilities.

• Offshore oil platforms.

• Airport facilities.

• Fuel loading racks.

DETECTOR RESPONSE TIME

The response time of the detector depends on the size of the
fire, the rate of propagation, fire type, and the proximity of the
fire to the detector. The average response time to a one
square foot gasoline fire at 50 feet is less than 6 seconds.

REMOTE TESTING

The detector has a remote test feature that allows the opera­tor to test the detection circuitry for proper function and also
check the optical integrity of the lens from a location that is
remote from the detector installation. To initiate a test, the
operator places the system in bypass and simply presses a

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test switch, usually located at the control panel. This actuates

0°

15°15°

30°

45°

30°

45°

Figure 2

Cone of Vision of Detector

100% represents the maximum
detection distance for a given fire.
The sensitivity increases as
the angle of incidence decreases.

5517f2.tif

an integral IR radiation source that is mounted inside the
detector, resulting in the simulation of a flickering fire. Upon
detection of the simulated fire, the detector latches into an
alarm condition to indicate that it is operating correctly. The
detector can then be reset by interrupting power to the unit
for a minimum of 0.3 second. The detector will fail remote
testing if 50% of the detection range is lost.

The LED is illuminated during an alarm condition to serve as
an integral visual alarm indicator.

IMPORTANT: Proof of successful remote test is activa­tion of alarm relay.

Cone of Vision

The detector has a nominal 80 degree cone of vision. How­ever, the detector can be rotated up to 360° so that the area
to be protected is within its cone of vision. Proper aiming and
adequate coverage is recommended to ensure hazardous
area protection. See Figure 2 below.

Theory of Operation

The electromagnetic emission of a hydrocarbon fire is char­acterized by a strong band in the 4.2 to 4.7 micron range.
This band, known as the CO
sion of energy generated by excited CO
this is the dominant feature of the spectral emission for
hydrocarbon fires, the IR sensor is designed to respond with
peak sensitivity to radiant energy at the 4.45 micron range.

The detection cell is a specially developed pyro-electric cell
with an integral optical filter window, which restricts incoming
light to the wavelength band 4.2 to 4.7 microns (the CO
spike). The detection cell responds by generating a signal
that is proportional to the radiation being detected.

2 spike, is caused by the emis-

2 molecules. Since

The electronic circuitry that processes the signal from the
detection cell checks for flicker response, ignoring signals
from spurious light sources. The flicker rate and count
requirements are factory set for levels characteristic of a
hydrocarbon fire. A flickering signal that exceeds the preset
alarm threshold will result in actuation of the alarm relay.

Specifications

Operating voltage: 18 to 32 VDC, with maximum ripple 0.5
vpp at 60 to 120 Hz.

Operating current: Standby: 1 watt. Alarm: 3.5 watts maxi­mum.

Relay contact rating: Alarm and Fault Relays have Form-C
contacts and are rated for 2.0 at 30 VDC.

Spectral sensitivity range: 4.2 to 4.7 microns.

Response time: Detector responds to a 1 foot-square gaso-

line fire (at zero axis to detector) in less than 6 seconds at 50
feet.

Cone of vision: 80 degrees nominal with sensitivity to 70%
at 40 ± 2 degrees of zero axis. Figure 2 shows cone vision of
typical sensor.

Temperature range: Operating: –40°F to 167°F (–40°C to
75°C). Storage: –67°F to 185°F (–55°C to 85°C).

Dimensions: See Figure 3.

Enclosure: Explosion-proof and watertight, anodized alumi-

num. Explosion-proof: Class 1, Div. 1, Groups C, D. Class II
Div. 1, Groups E,F,G. Wat er tight: NEMA 4. Conduit fitting: 3/4
inch NPT (Female).

2

Shock and vibration: meets MIL STD 810C vibration.

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