Notifier 30-2021E-24 User Manual

Model 30-2021-24

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Model 30-2021E-24

30-2021-24 &
30-2021E-24

Ultraviolet Flame Detectors

General

The Pyrotector Model 30-2021-24 and Model 30-2021E-24
Ultraviolet (UV) Flame Detectors are highly sensitive to the

ultraviolet radiation given off by all types of flames, including
those produced by flammable liquids and gases. Since the
detector does not respond to normal ambient light conditions
such as sunlight, incandescent or fluorescent lighting, it is ide­ally suited for use as a flame detector in a variety of areas.

The Pyrotector Ultraviolet Flame Detector is a compact unit­ized package consisting of a detection tube, encapsulated
solid state electronic circuitry, and a dry-contact Form-C
(SPDT) alarm relay. In the event of an alarm, the relay latches
on and an alarm light is illuminated for easy identification of
the unit in the alarm state. The relay is reset by momentarily
interrupting power to the unit. A three-second time delay is
built in to minimize false alarms cause by the presence of
sparks, lightning, etc.

• Model 30-2021-24 is contained in a general purpose enclo-

sure and is intended for indoor use only. It mounts on a
standard 4" (10.16 cm) octagonal electrical junction box
(not included).

• Model 30-2021E-24 is intended for indoor use and is con-

tained in an explosion-proof enclosure that meets all
requirements for NEC Class I Groups C and D; Class II
Groups E, F, and G; and Class III hazardous locations.

• Both models operate on 24 VDC.

Theory Of Operation

The Model 30-2021-24 and Model 30-2021E-24 UV Flame
Detectors operate with a Geiger-Muller-type tube that utilizes
an ultraviolet sensitive photocathode within a fused silica enve­lope. When exposed to UV radiation, the photocathode emits
electrons that ionize the inert gas inside the tube. This initiates
the current flow that produces an alarm signal.

Application Considerations

To ensure proper operation of the detector, the viewing window
and the surface of the sensing tube must be kept clean and
free of contaminating films at all times. When cleaning the
sensing tube, the user must exercise caution to apply mini­mum pressure, thereby minimizing the possibility of damage to
the detector tube.

Cutting and welding operations within the cone of vision of the
detector can generate high levels of UV radiation that can
result in actuation of the detection system. To avoid unwanted
alarms, it is suggested that the detection system be de-ener­gized while these activities are occurring.

It should be noted that ultraviolet detectors will not detect glow-
ing embers. A high-speed ember detector such as the Model
30-2054-24 or 30-2054A-24 should be used for this type of
application.

Specifications

• Operating voltage: 22 to 27 VDC for 24 VDC unit.

• Operating current: STANDBY: 12 mA maximum @ 24

VDC. ALARM: 100 mA@ 24 VDC.

• Alarm relay contact rating: 1 A @ 26 VDC.

DN-1253:B • I-207

Conventional Initiating Devices

• Spectral sensitivity range: 1700 to 2900 angstroms, with

peak response at 2100 angstroms.

• Temperature range: –13°F (–25°C) to +140°F (+65°C).

• Humidity range: up to 90% RH.

PHYSICAL SPECIFICATIONS, 30-2021-24:

• Enclosure type: general-purpose painted steel with pro-

tective cage and totally encapsulated electronics.

• Dimensions: 4.09" (10.389 cm) diameter; 3" (7.62 cm)

deep.

• Weight: 0.75 lb. (0.34 kg).

PHYSICAL SPECIFICATIONS, 30-2021E-24:

• Enclosure type: explosion-proof housing with 3/4" (1.905

cm) NPT female entries. NEC Class I, Groups C and D;
Class II, Groups E, F, and G; Class III.

• Dimensions: 6.76" (17.17 cm) x 2.75" (6.985 cm) x 4.75"

(12.065 cm).

• Weight: 3.75 lbs. (1.7 kg).

Detector Sensitivity

The response time of the detector is a function of the size of
the fire, fuel type, and the distance from the detector to the fire.
Smaller fires and greater distances normally require greater
response times. Figure 1 illustrates the relative sensitivity of
the Model 30-2021-24 Detector to gasoline fires. Figure 2
shows the relative sensitivity of the Model 30-2021E-24.

The Model 30-2021E-24 is approximately 10% less sensitive.
For example, a three-second response time is achieved at 10
feet (3.048 m) rather than 12 feet (3.658 m) when detecting a
6" (15.24 cm) gasoline fire.

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Cone of Vision

Figure 1 Model 30-2021-24 Detector Sensitivity

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Figure 2 Model 30-2021E-24 Detector Sensitivity

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Figure 3 Model 30-2021-24

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Figure 4 Model 30-2021E-24

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The Model 30-2021-24 has an 180° cone of vision. Relative
sensitivity is greatest at a viewing angle of 45° on either side of
the central axis. At angles greater than 45°, sensitivity
decreases, as illustrated in Figure 3. For the viewing pattern of
Model 30-2021E-24, with 60° cone of vision, see Figure 4.

Installation And Wiring

The Model 30-2021-24 and Model 30-2021E-24 are intended
for use in indoor applications. Connection to both models is via
color-coded wire leads with the following functions:

• RED: +24 V operating power input.

• BLACK: Common 24 V operating power input.

• WHITE: ALARM relay – common.

• BLUE: ALARM relay – normally closed contact.

• ORANGE: ALARM relay – normally open contact.
The Model 30-2021-24 can be mounted on a standard 4"

(10.16 cm) junction box. The junction box should be mounted
securely to a supporting surface such as a wall, piping, etc.
See Figure 5 for 30-2021-24 mounting hole locations. Connect
the external wiring to the detector as illustrated in Figure 7 and
Figure 8.

To install the Model 30-2021E-24, remove the front cover from
the detector and mount the detector on the junction box. See
Figure 6 for 30-2021E-24 mounting hole locations. Make the
electrical connections as shown in Figure 7 and Figure 8.
Place the cover back on the detector and mount it to any flat
surface.

A swivel mount is available for use with the Model 30-2021E to
facilitate installation and orientation and provide easy adjust­ment for the viewing field of the detector — order part number
10-3995. This optional accessory meets the same NEC
requirements for use in hazardous areas as the detector.

Maintenance

To assure maximum detector sensitivity, keep the surface of
the sensor tube free from dirt or other contaminants at all
times. Periodically test the sensitivity of the detector using a
controlled flame or a UV test lamp such as the model W8066.

Engineering Specifications

The unit shall be an open area ultraviolet flame detector
designed to operate on 24 VDC.

It shall have encapsulated electronic circuitry and Form-C
alarm relay contacts. The unit shall have built-in alarm indica­tion from the front of the detector. It shall respond to a 12-inch
(30.48 cm) diameter gasoline fire in six seconds when viewed
head-on from a distance of 30 feet (9.144 m). The detector
shall not respond to normal ambient light conditions such as
sunlight, incandescent, or fluorescent light.

The detector shall have a three-second time delay to spurious
responses. Model 30-2021-24 shall have a 180° cone of vision
with the greatest sensitivity at 45° on either side of the central
axis. Model 30-2021E-24 shall have a 60° cone of vision.

Explosion-proof units shall meet NEC Class I, Groups C and
D; Class II Groups E, F, and G; Class III.

Agency Listings and Approvals

Consult panel manuals for lists of compatible UL-Listed
devices. In some cases, certain modules or applications may
not be listed by certain approval agencies, or listing may be in
progress. Consult factory for latest listing status.

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