Spectrex 20-20SH User Manual

Hydrogen Flame Detector

Model 20/20SH

User and Maintenance Manual

TM 784600, Rev. A, May 2005

Factory Mutual (Pending)

Class I Div. 1 Groups B, C, D
Class II Div. 1 Groups E, F, G

Web-Site: www.spectrex.net

218 Little Falls Rd., Cedar Grove, NJ 07009 USA;

Phone: [phone] Fax: [phone]

ATEX (Pending)

Ex II 2G
EExd IIB + H
EExde IIB + H

; Email: [e-mail]

T5

2

2

T5

The SharpEye Optical Flame Detector described in this document is the property
of Spectrex, Inc.

No part of the hardware, software or documentation may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any
language or computer language, in any form or by any means, without prior
written permission of Spectrex, Inc.

While great efforts have been made to assure the accuracy and clarity of this
document, Spectrex, Inc. assumes no liability resulting from any omissions in this
document, or from misuse of the information obtained herein. The information in
this document has been carefully checked and is believed to be entirely reliable
with all of the necessary information included. Spectrex Inc. reserves the right to
make changes to any products described herein to improve reliability, function, or
design, and reserves the right to revise this document and make changes from
time to time in content hereof with no obligation to notify any persons of revisions
or changes. Spectrex, Inc. does not assume any liability arising out of the
application or any use of any product or circuit described herein; neither does it
convey license under its patent rights or the rights of others.

Warning:

This manual should be carefully read by all individuals who have or will have
responsibility for using, maintaining or servicing the product.

The Detector is not field-repairable due to the meticulous alignment and
calibration of the sensors and the respective circuits. Do not attempt to modify or
repair the internal circuits or change their settings, as this will impair the system's
performance and void the Spectrex, Inc. Product warranty.

Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

T

ABLE OF CONTENTS

1. Scope ....................................................................................................1

RODUCT OVERVIEW.....................................................................................1

1.1 P

OCUMENT OVERVIEW...................................................................................1

1.2 D

2. Technical Description..........................................................................2

RINCIPLES OF OPERATION............................................................................3

2.1 P

2.1.1 Hydrogen fire detection.........................................................................3

2.1.2 Identifying the H

O peak.......................................................................3

2

3. Performance .........................................................................................5

ETECTION SENSITIVITY.................................................................................5

3.1 D

ONE OF VISION ...........................................................................................6

3.2 C

3.3 F

ALSE ALARMS PREVENTION ..........................................................................7

4. Operation..............................................................................................8

ISUAL INDICATIONS ......................................................................................8

4.1 V

UTPUT SIGNALS ..........................................................................................9

4.2 O

4.2.1 Optional latching.................................................................................10

4.2.2 Built-In-Test (BIT) ...............................................................................10

4.2.3 Accessory Relay as EOL....................................................................10

ETECTOR MODE SETUP..............................................................................11

4.3 D

4.3.1 Function Setup....................................................................................12

4.3.2 Sensitivity Ranges ..............................................................................12

4.3.3 Alarm Delay........................................................................................13

4.3.4 Addresses Setup ................................................................................13

UILT IN TEST .............................................................................................14

4.4 B

5.Technical Specifications.....................................................................16

LECTRICAL SPECIFICATIONS .......................................................................16

5.1 E

5.2 M

ECHANICAL SPECIFICATIONS ......................................................................20

NVIRONMENTAL SPECIFICATIONS.................................................................21

5.3 E

6. Installation Instructions.....................................................................22

COPE........................................................................................................22

6.1 S

ENERAL CONSIDERATIONS .........................................................................22

6.2 G

6.3 P

REPARATIONS FOR INSTALLATION................................................................23

ONDUIT INSTALLATION................................................................................23

6.4 C

ETECTOR MOUNTING .................................................................................24

6.5 D

6.5.1 Swivel Mount Kit:.... ... .. .. .. .. .. ... .. .. .. .. .. ... .......................... .. .. .. .. ... .. .. .. ....24

6.5.2 Swivel installation (Figs. No. 8 and 9):................................................24

6.6 W

6.7 T

6.8 O

IRING (REFER TO FIG. 12).............................. .. .. ... .. .. .. .. .. ... .. .. .. .. .. ... .. .. ......27

ERMINAL WIRING (SEE FIG. NO.10 AND NO.11.)...........................................28

PERATION MODE .......................................................................................32

7. Operating Instructions.......................................................................33

COPE........................................................................................................33

7.1 S

OWER-UP .................................................................................................33

7.2 P

7.3 R

ESET (IF OPTIONAL LATCHING OPERATION SELECTED)...................................33

UNCTIONAL TESTING...................................................................................33

7.4 F

7.4.1 Manual BIT Test .................................................................................34

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

7.5 S

AFETY PRECAUTIONS.................................................................................34

8. Maintenance Instructions..................................................................35

COPE........................................................................................................35

8.1 S

8.2 M

AINTENANCE INSTRUMENTATION AND PERSONNEL .......................................35

REVENTIVE MAINTENANCE PROCEDURES.....................................................35

8.3 P

ERIODIC MAINTENANCE PROCEDURES.........................................................35

8.4 P

8.4.1 Power-Up Procedure ..........................................................................35

8.4.2 Functional Test Procedure..................................................................35

AINTENANCE RECORDS..............................................................................36

8.5 M

8.6 T

ROUBLESHOOTING .....................................................................................36

8.6.1 Fault Indication ...................................................................................36

8.6.2 False Alarm or Warning Indication......................................................36

Appendix A - Wire Selection Tables..................................................... 37

Appendix B – Typical Wiring Configurations.......................................39

Appendix C – RS-485 Communication Network ..................................43

Appendix D - Mounting the “EExde approved” version......................45

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

L

IST OF FIGURES

Figure 1: Hydrogen (SH) Flame Detector................................. ..... ... ..... ...... .. ...... ..... ..... ... .3

Figure 2: Flame Detector Assembly - Outline Drawing ....................................................4

Figure 3: Horizontal and Vertical Fields of View................................................ ..... ..... ... .6

Figure 4: Indication LEDs..................................................................................................8

Figure 5: Detector Setup Screen........................ ..... ...... .. ...... ..... ... ..... ..... ... ..... ...... .. ...... ....11

Figure 6: Electrical Interface............... ..... ... ..... ..... ... ..... ...... .. ...... ..... ..... ... ..... ...... .. ...... ....17

Figure 7: Flame Detector Assembly - Schematic Section ............................ .. ... ...............19

Figure 8: Hydrogen Detector and Swivel Mount Assembly ............................................. 25

Figure 9: Swivel Mount Assembly - Outline Drawing......................................................26

Figure 10: Terminal Board........................................ ..... ...... .. ...... ..... ... ..... ..... ... ..... ... ..... ..29

Figure 11: Flame Detector Assembly - Wiring Diagram.................................................30

Figure 12: Hydrogen Flame Detector with cover removed..............................................31

Figure 13: Flame Detector Wiring Diagram..................... ..... ...... .. ...... ..... ... ..... ..... ... ..... ..39

Figure 14: Typical wiring diagram for 4 wire controllers..................................... ... ....... 40

Figure 15: Typical wiring diagram for controllers with alarm & fault loops ..................41

Figure 16: 4-20mA wiring.............................. ...... .. ...... ..... ... ..... ..... ... ..... ... ..... ...... .. ...... ....42

Figure 17: RS-485 networking...................... ..... ... ..... ..... ... ..... ...... .. ...... ..... ... ..... ..... ... ..... ..43

Figure 18: Flame Detector Assembly - Wiring Diagram.................................................47

Figure 19: OPTION A Flame Detector Assembly - Wiring Diagram (“de version”).....48

Figure 20: OPTION B Flame Detector Assembly - Wiring Diagram (“de version”).....48

LIST OF TABLES

Table 1: Alarm Response Time Versus Range.................................................................... 5

Table 2: Response Sensitivity for other Fuels..................................................................... 6

Table 3: Immunity To False Alarm Sources.......................................................................7

Table 4: Welding Immunity Distance ..................................................... ... .........................7

Table 5: Output Signals Versus Detector State ..................................................................9

Table 6: Function Setup........................................................ ............................................ 12

Table 7: Sensitivity range ............................................. .. ................................... ...............12

Table 8: Time delay ..........................................................................................................13

Table 9: Contact Ratings.................................................................................................. 18

Table 10: Mounting according to US Version................................ ... ...............................24

Table 11: Mounting according to EU Version ....................................................... .......... 24

Table 12: Maximum DC resistance at 68˚F for copper wire............................................37

Table 13. Wiring length in feet (meter)............................................................................. 37

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

1. Scope

1.1 Product Overview

The Spectrex Model 20/20SH is a special version of the Hydrogen Flame Detector
that is manufactured in S.M.T. Technology. The detector is designed to provide
maximum fire protection in areas where hydrogen fires are likely to occur.

This detector includes sensors with special filters with spectral bands typical to
hydrogen flame emission’s main combustion product - water vapor (H
1-4 microns band and reference filters to discriminate background radiation. The
microprocessor design allows for unique field programmability, making the
20/20SH highly immune to false alarms.

The front section of the 20/20SH is sealed to keep the electronic and sensor
chamber dry for longer life. The programmable functions are available through a
RS-485 port used with a standard PC or by hand held computer and software
supplied by Spectrex.

Refer to Manual TM 784050 for instructions to use the HOST software and to
change the required Functions.

O) - in the

2

1.2 Document Overview

This manual describes the detector and its features and provides instructions on
the installation, operation and maintenance.

This manual is divided into separate chapters as follows:
Chapter 1. Scope - a general introduction and overview of the product and the

Manual, with a brief description of its content.
Chapter 2. Technical Description - the detector’s theory of operation.
Chapter 3. Performance - the detector features and capabilities.
Chapter 4.

Chapter 5. Technical Specifications - the Detector’s electrical, mechanical and
Chapter 6. Installation Instructions, including wiring and mode setting.

Chapter 7. Operating Instructions and power-up procedures.
Chapter 8.
Appendix A. Wiring Selection Tables for electrical wire selection according

Appendix B.
Appendix C. RS-485 Communication Network

Appendix D.

Operation

indications.

environmental specifications.

Maintenance Instructions

to installation configuration.

Typical Wiring Configurations

installation.

Mounting the “EExde” version

- the detector’s operation modes, user interface and

and support procedures.

- wiring diagrams for

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

2. Technical Description

•

Detection Range: up to 100 ft (30 m) for an Hydrogen plume fire with 20”
(0.5m) height and 8” (0.2m) width.

•

Ultra High Immunity to False Alarms (see section. 3.3).

• Advanced Digital Processing of the Dynamic Characteristics of Fire:

Flickering, Threshold correlation and Ratio.

•

Three Separate IR Channels: Between 1-4 microns.

• Field Programmable Sensitivity: four ranges.

•

Two Response Levels

•

Solar Blind

• Microprocessor Based: Digital signal processing.

•

Built In Test

•

Electrical Interface:

Dry contact RELAYS.

o

Communication network RS-485.

o
o 4-20mA output.

• Certification: Pending by F.M and ATEX.

: Manual and Automatic (see section. 4.2.2).

: Warning & Detection.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

2.1 Principles Of Operation

2.1.1 Hydrogen fire detection

This Fire Detector detects the invisible Hydrogen flames by spectral analysis of the
infrared energy emitted by the fire. Special sensors and filters have been selected
to identify the hydrogen’s main combustion product – water vapor.

2.1.2 Identifying the H

The hydrogen fire is characterized by a typical radiation emission. The H

O peak

2

O peak

2

emits intense radiation at several peaks in the spectral band between 1-4 µ and
weaker radiation intensity outside these spectral bands. Special sensors and filters
have been selected to analyze this radiation pattern. The result is a unique flame
detector, which does not produce false alarms and, at the same time, provides
detection over greatly increased distances compared to previous methods.

Figure 1: Hydrogen (SH) Flame Detector

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 2: Flame Detector Assembly - Outline Drawing

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

3. Performance

3.1 Detection Sensitivity

Detection sensitivity is the maximum distance at which the detector will reliably
detect a specific size of fire & typical type of fuel (standard fire).

Standard Fire:

Gases – define by a plume fire with 20” (0.5m) height and 8” (0.2m) width
or
Liquid - 1ft

Wind speed of 6.5 ft/sec (2 m/sec).

Sensitivity Ranges:

The detector has four user selectable sensitivity ranges. For each range there are
two response levels.

1. WARNING (Pre-alarm)

2. ALARM

The detection distance, for the WARNING level, is approximately 10% higher than
the ALARM distance.

Alarm response times for a “standard fire” at a specified range are shown
hereunder.

* These results refers to Hydrogen
For some typical ambient conditions the Zeta parameter as defined in NFPA 72 for

the detector is 0.005 (1/meter).

Zeta parameters may vary significantly with changes in temp, air pressure,
humidity, visibility conditions, etc.

2

(0.1m2) pan fire

Table 1: Alarm Response Time Versus Range

Sensitivity 1 2 3 4
Range – ft (m) 16 (5) 33 (10) 66 (20) 100 (30)
Response Time (sec) 3 5 8 10

Note:

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Other fuels

The detector will react to other types of fires as follows:
Fire Size: Methanol and ethanol - 1ft

2

(0.1m2) pan fire

Maximum Wind Speed: 6.5 ft/sec (2 m/sec)
Maximum Response Time: 10 sec

Table 2: Response Sensitivity for other Fuels

Type Of Fuel % of Max. Distance

Hydrogen 100%
Ethanol 62%
Methanol 26%

3.2 Cone Of Vision

Horizontal: 90°
Vertical: 90°

Figure 3: Horizontal and Vertical Fields of View

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

3.3 False Alarms Prevention

The detector will not provide an alarm or a warning signal as a reaction to the
radiation sources specified below.

Notes:

IAD = Immune at Any Distance.
All sources are chopped from 0 to 20Hz.

Table 3: Immunity To False Alarm Sources

Radiation Source Immunity

Distance ft(m)

Sunlight IAD
Indirect or reflected sunlight IAD
Vehicle headlights (low beam) conforming to MS53023-1 IAD
Vehicle IR lights (low beam) conforming to MS53024-1 IAD
Incandescent frosted glass light, 100 W IAD
Incandescent clear glass light, rough service, 100 W IAD
Fluorescent light with white enamel reflector, standard office or

IAD
shop, 40 W (or two 20 W)
Electric arc [12mm (15/32 in) gap at 4000 V alternating current,

IAD
60 Hz]
Arc welding [4 mm (5/32 in) rod; 240 A] See Table 4
Ambient light extremes (darkness to bright light with snow, water,

IAD
rain, desert glare and fog)
Bright colored clothing, including red and safety orange. IAD
Electronic flash (180 watt-seconds minimum output) IAD
Movie light, 625 W quartz DWY lamp (Sylvania S.G.-55 or

6.5 (2)
equivalent)
Red dome light conforming to MS51073-1 IAD
Blue-green dome light conforming to M251073-1 IAD
Flashlight (MX 991/U) IAD
Radiation heater, 1500 W IAD
Radiation heater, 1000 W with fan IAD
Quartz lamp (1000 W) 10 (3)
Mercury vapor lamp IAD
Grinding metal IAD
Lit cigar 1 (0.3)
Lit cigarette 1 (0.3)
Match, wood, stick including flare up 10 (3)

Table 4: Welding Immunity Distance

SW setting Detection Range Immunity Distance

1 16 ft (5m) >13 ft (4m)
2 33 ft (10m) >20 ft (6m)
3 66 ft (20m) >30 ft (9m)
4 100 ft (30m) >40 ft (12m)

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4. Operation

4.1 Visual Indications

Two LED-indications are located in the detector front window:
i. Power LED (Yellow)

Normal - LED ON
BIT failure - LED flashes (4 Hz)
ii. Alarm LED (Red)
Normal - LED OFF
Warning - LED flashes (2 Hz)
ALARM - LED ON

Figure 4: Indication LEDs

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4.2 Output Signals

The detector controls the following outputs:

• Alarm relay

• Accessory relay

•

Fault relay

•

4-20mA current output

• RS-485 communication

The detector can be in one of the following states.

Normal: The detector is functioning normally.
BIT: The detector performs a Built-In-Test.
Warning: Fire detected - changed to warning – pre-alarm state.
Alarm: Fire detected - changed to fire alarm state.
Latched Alarm
(Optional)

The alarm outputs are latched due to the detection of a fire that
has already been extinguished.

BIT Fault: A fault is detected during BIT sequence. The detector will

continue to detect fire if the alarm conditions occur.

Fault: A fault is detec ted when the power supply is too low or during a

software fault.

In each state the detector will activate different outputs as specified in table 5.

Table 5: Output Signals Versus Detector State
Detector
State

Power
Led

Alarm
Led

Alarm
Relay

Accessory
Relay

Fault
Relay

4-20mA
Output

Normal On Off Off Off On 5mA
Warning On Flash

Off On

(1)

On 10mA

2Hz

Alarm
Latch

(4)

(2)

On On On Off On 15mA

On On On On
BIT Fault
Warning at
BIT Fault
Alarm at BIT
Fault
Fault Flash

On On On On On 15mA

(1)

(3)

Flash Off Off Off Off 2mA

Flash
4Hz
Flash

Flash

Off On
4Hz
On On On Off 15mA

On 15mA

(1)

Off 10mA

4Hz

Off Off Off Off 0mA

4Hz

Note:
1 Accessory relay can be activated at warning level or alarm level depending on

programmable function
2 The Alarm state can be latched according to programmable function
3 The detector will be in its BIT FAULT state until it has passed a successful BIT.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4 The alarm outputs will be activated as long as the alarm conditions are present

and will stop approximately 5 seconds after the fire is no longer detected.

4.2.1 Optional latching

The detector includes a latched alarm output capability, which operates according
to the programmable function. Upon the detection of a fire, the detection signal is
latched until manually reset (disconnecting the power supply or performing a
manual BIT). Latching affects the Alarm Relay, 4-20mA output, the Alarm LED (the
Accessory Relay will be latched only when the function “Alarm Latch” at YES (see
table 6)).

4.2.2 Built-In-Test (BIT)

Successful Manual BIT

will activate the following outputs according to

programmable function (see table 6).
Alarm BIT at Yes

Alarm BIT and Accessory
BIT at Yes

•

•

Alarm Relay

The

will be activated for 3 sec.

The 4-20mA output will provide 15mA for 3 sec.

• The Accessory & Alarm Relays will be activated
for 3 sec.

• The 4-20mA output will provide 15mA for 3 sec.

Accessory BIT at Yes
Alarm BIT at No

• The Accessory Relay will be activated for 3 sec.

•

The 4-20mA output will provide 10mA for 3 sec.

4.2.3 Accessory Relay as EOL

The accessory relay is used as End of Line relay. In this case, the accessory relay
is active as long as the detector is not in its FAULT state.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4.3 Detector Mode Setup

The setup screen allows seeing and programming the detector function to
determine different functions of the detector. Refer to Manual TM784050.

Figure 5: Detector Setup Screen

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4.3.1 Function Setup

The user can select the desired mode of operation by means of host.

Table 6: Function Setup

Name Yes No

1 Alarm Latch Alarm latching enable Alarm latching disable

(default)

2 Accessory Relay Accessory Relay activate at

warning level

3 Automatic BIT Automatic & manual bit

Accessory Relay activate
at Alarm level (default)
Manual bit only

(default)

4 Alarm BIT Successful manual bit

activates the Alarm Relay for
approximately 3 seconds

Successful manual bit
does not activate the
Alarm Relay

(default)

5 Accessory BIT Successful manual bit

activates the Accessory Relay
for approximately 3 seconds

Successful manual bit
does not activates the
Accessory Relay

(default)

6 EOL Accessory Relay is used as

End of Line

Accessory Relay operates
in accordance with
Function 2 and 5 (default)

4.3.2 Sensitivity Ranges

The detector offers four (4) sensitivity settings. The settings refer to the Hydrogen
plume fire with 20” (0.5m) height and 8” (0.2m) width, from low sensitivity of 16 ft.
(5m) to 100 ft. (30m). For other types of fuel sensitivity, refer to table 2.

Table 7: Sensitivity range

## Sensitivity

1 16 ft. (5m)
2 33 ft. (10m)
3 66 ft. (20m)

4* 100 ft. (30m)

* Default

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4.3.3 Alarm Delay

The detector is equipped with an Alarm Delay option, which provides
programmable time delays of 0 to 30 sec. with eight (8) fixed settings at: 0, anti­flare, 3, 5, 10, 15, 20, and 30 sec. When an Alarm (Detection) level condition is
encountered, the detector delays the execution of the Alarm output’s relay by the
specified period of time. The detector will then evaluate the condition for 3 sec. If
the Alarm level is still present, the Alarm outputs will be activated. If this condition
no longer exists, the detector will return to its standby state. The Alarm delay
option will affect the output relay and the 4-20mA. The LEDS will indicate warning
level during the delay time only if the fire condition exists.

ANTI FLARE

Anti Flare mode is selected to prevent false alarm in locations where fast flares
may be present. The Time delay for fire alarm in this mode is from 2.5 to 15 sec.
(mostly less than 10 sec.).

Table 8: Time delay

Delay (sec.)

0

A* -- anti-flare

3

5
10
15
20
30

* Default

Note:

The new FM approval from January 2003 does not allow using 20 and 30
second delay.

4.3.4 Addresses Setup

Refer to TM784050 for instructions for defining the addresses of the detectors.
The detector provides up to 247 addresses that can be used with RS-485
communication link.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

4.4 Built In Test

A. General
The detectors’ Built In Test (BIT) checks the following:

•

Electronics circuitry

• Sensors

• Window cleanliness

The detector can be set to perform the BIT automatically and manually or
manually only.

B. Principles
If the result of a BIT is the same as the current status of the detector (NORMAL or
BIT FAULT), the detector's status is unchanged. If the result of a BIT differs from
the current status of the detector, the detectors’ status is changed (From NORMAL
to BIT FAULT or from BIT FAULT to NORMAL).

Note: In BIT FAULT status the detector can continue to detect a fire.
C. Manual BIT only

The BIT is initiated manually by momentarily connecting Terminal No. 3 with
Terminal No. 2. A successful manual BIT activates the following:

• FAULT relay is closed.

• ALARM relay is activated for 3 sec. (only when Function Alarm BIT at YES)

•

ACCESSORY relay is activated for 3 sec. (only when Function Accessory
BIT at YES)

•

4-20mA OUTPUT current will be 15mA only when Function Alarm BIT at
YES or 10mA when Function Accessory BIT at YES and Function Alarm
BIT at NO.

Unsuccessful BIT activates the following:

•

FAULT relay is released.

• 4-20mA output indicates BIT FAULT condition (2mA).

• POWER LED (yellow) flashes (4 Hz).

Note

During a Manual BIT, if Function Alarm BIT or Function Accessory BIT are in
YES position, the Alarm, Accessory Relays and 4-20mA will be activated.
Therefore, automatic extinguishing systems or any external devices that should
not be activated during BIT should be disconnected.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

D. Automatic & Manual BIT
Manual Bit

Functions as described in Paragraph 4.4.C. In the case of an unsuccessful BIT all
outputs will function as described in Paragraph. 4.4.C, but the BIT will be
automatically executed every 1-minute. This mode of operation will continue until
successful Bit has been encountered. As a result, the detector will resume its
normal operation.

Automatic BIT
The detector automatically performs a BIT every 60 minutes.

A successful BIT sequence does not activate any indication:

The FAULT relay is CLOSED (NORMAL).
The POWER LED is ON (NORMAL).
The 4-20mA Output Indicate NORMAL (5mA).

An unsuccessful BIT sequence activates the following:

The FAULT relay is opened.
4-20mA output indicate BIT FAULT (2mA).
The POWER LED (yellow) flashes (4 Hz).
BIT procedure will be performed every 1 minute.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

5.Technical Specifications

5.1 Electrical Specifications

A. Operating Voltage: 18-32 VDC
B.

Power Consumption

Max. 100mA in Stand-by
Max. 150mA in Alarm

C. Electric input protection: The input circuit is protected against voltage-

reversed polarity, voltage transients, surges and spikes according to MIL­STD-1275A.

:

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

D. Electrical Interface:

Figure 6: Electrical Interface

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

E. Electrical outputs

• Dry Contact Relays:

Table 9: Contact Ratings
Relay
Name

Type Normal

position

Maximum Ratings

Alarm SPDT N.O. N.C. 2A at 30VDC or 0.5A at 250 VAC
Accessory SPST N.O. 5A at 30VDC or 250 VAC
Fault SPST N.C. 5A at 30VDC or 250 VAC

• 4-20mA Current Output:
Terminals 11 and 12:

STATE Output
FAULT 0 + 0.5mA
BIT FAULT 2mA±10%
NORMAL 5mA±10%
WARNING 10mA±5%
ALARM 15mA±5%

• Communication Network:
The detector is equipped with an RS-485 communication link that can
be used in installations with computerized controllers.

The communicator protocol is compatible with the Modbus
communicator protocol.

This protocol is a standard and widely used.

o
o It enables continuous communication between a single standard

Modbus controller (Master device) and a serial Network of up to
247 detectors.

o It enables connection between different types of Spectrex detectors

or other
Modbus devices to the same Network.

o

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 7: Flame Detector Assembly - Schematic Section

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

5.2 Mechanical Specifications

A. Enclosure

Aluminum: Chromate coating and Epoxy enamel finish
or
Stainless Steel 316: Electrochemical passivation coating

B. Explosion proof

FM (pending) Class I Div. 1 Groups B, C and D;

Class II Div. 1 Groups E, F and G.

ATEX (pending)

Ex II 2G SIRA 00ATEX 1163, 1164
EExd IIB + H
T5

Temp. -40°F (-40 °C) to 160°F (70 °C)

2

Option: -40°F (-40 °C) to 185°F (85 °C)

Per EN 50014 & EN 50018
EExde IIB + H
T5

Temp. -40°F (-40 °C) to 160°F (70 °C)

2

Per EN 50014, 50018 & 50019

(see Appendix D)

C. Water and dust tight

NEMA 250 type 6p.
IP 66 and IP 67 per EN 60529

D. Electronic Modules

Conformable coating.

E. Electrical connection (two positions)

3/4"-14NPT conduit or

M25 x 1.5(ISO).

F. Dimensions

Base: 5.2 x 5.2 in (132 cm x 132 cm)
Height: 4.7 in (120 cm)

G. Weight

8.1 lbs. (3.7 Kg) – Aluminum Alloy

14.3 lbs. (6.5 Kg) – ST. ST 316

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

5.3 Environmental Specifications

A. High Temperature

Design to meet MIL-STD-810C, method 501.1 procedure II
Operating temperature: +160 °F (+70 °C)

Optional operating

+185 °F (+85 °C)

temperature:

Storage temperature: +185 °F (+85 °C)

B. Low Temperature

Design to meet MIL-STD-810C, method 502.1, procedure I
Operating temperature: -40 °F (-40 °C)
Storage temperature: -65 °F (-55 °C)

C. Humidity

Design to meet MIL-STD-810C, method 507.1, procedure IV
Relative humidity of up to 95% for the operational temperature range.

D. Salt Fog

Design to meet MIL-STD-810C, method 509.1, procedure I
Exposure to a 5% Salt Solution Fog for 48 hours.

E. Dust

Design to meet MIL-STD-810C, method 510.1, procedure I

Exposure to a dust concentration of 0.3 frames/cubic ft. at a velocity of
1750 fpm, for 12 hours.

F. Vibration

Design to meet MIL-STD-810C, method 514.2, procedure VIII

Vibration at an acceleration of 1.1g within the frequency range of 5-30 Hz,
and an acceleration of 3g within the frequency range of 30-500 Hz.

G. Mechanical Shock

Design to meet MIL-STD-810C, method 516.2, procedure I
Mechanical Shock of 30g half-sin wave, for 11 msec.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

6. Installation Instructions

6.1 Scope

The "Spectrex" Model 20/20SH is a self-contained Optical Flame Detector,
designed to operate as a stand-alone unit directly connected to alarm systems or
automatic fire extinguishing systems. The detector can be a part of a more
complex system where many detectors and other devices are integrated through a
common control unit. This chapter does not attempt to cover all of the standard
practices and codes of installation. Rather, it emphasizes specific points of
consideration and provides some general rules for qualified personnel. Wherever
applicable, special safety precautions are stressed.

6.2 General Considerations

Very Important

The detector should be aimed toward the center of the detection zone and
have a completely unobstructed view of the protected area. Whenever
possible, the detector face should be tilted down at a slight angle to prevent
the accumulation of dust and dirt. Do not start an installation unless all
conceivable considerations regarding detector location have been taken into
account.

To ensure optimal performance and an efficient installation, the following
guidelines should be considered:

A. Sensitivity

To determine the level of sensitivity, the following issues should be
considered:

•

Size of fire at determined distance to be detected.

• Type of flammable materials.

B. Spacing and Location

The number of detectors and their locations in the protected area are
affected by:

• Size of the protected area

• Sensitivity of the detectors

•

Obstructed lines of sight

•

Cone of view of the detectors

C. Environment

•

Dust, snow or rain can reduce the detectors sensitivity and require
more maintenance activities.

• The presence of high intensity flickering of IR sources may affect
sensitivity.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

6.3 Preparations for Installation

Installation should comply with NFPA 72E or other local codes, as applicable to
flame detectors. The detectors can be installed with the use of general-purpose
common tools and equipment.

1 Verify the appropriate Purchase Order. Record the Part No. and the Serial No.

of the detectors and the installation date in the appropriate Log-book.

2 Open the container package prior to detector installation and visually inspect

the detector.

3 Verify that all components required for the detector installation are readily

available before commencing the installation. In case that the installation is
not completed in a single session, secure and seal detectors and conduits.

4 For wiring, use color-coded conductors or suitable wire markings or labels.

12 to 20 AWG wires may be used for site wiring. The selection of wire gauge
should be based on the number of detectors used on the same line and the
distance from the control unit, in compliance with specifications
(See Appendix A).

6.4 Conduit Installation

1 To avoid water condensation water in the detector, it should be installed with

the conduits /cable entries facing downwards, and should include drain holes.

2 When using the optional swivel mount, use flexible conduits / cables for the

last portion connecting to the detector.

3 For installations in atmospheres as defined in group B of the NFPA 72E,

conduits inlets should be sealed.

4 When pulling the cables through the conduits, ensure that they are not tangled

or stressed. Extend the cables about 30 cm. (12 in.) beyond the detector
location to accommodate wiring after installation.

5 After the conductor cables have been pulled through the conduits, perform a

continuity test.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

6.5 Detector Mounting

The detector may be mounted on a simple fabricated bracket, or preferably the
optional Swivel Mount, Model 20/20-003. The Swivel Mount enables the detector
to be rotated up to 40 degrees in all directions.

6.5.1 Swivel Mount Kit:
Table 10: Mounting according to US Version

Item Qty. Type/Model Location
Swivel Mount 1 20/20-003
1/4"-20UNC Screw 4 1/4" –20UNC Detector - Holding plate
1/4" Spring Washer 4 1/4" Detector - Holding plate

Table 11: Mounting according to EU Version

Item Qty. Type/Model Location
Swivel Mount 1 20/20-003-1
Screw 4 M6 X 1P Detector - Holding plate
Spring Washer 4 M6 Detector - Holding plate

6.5.2 Swivel installation (Figs. No. 8 and 9):

1 Place the swivel mount (item 6) in its designated location and secure it with

four (4) M6 or 1/4" screws (item 11) (recommended), placed 76.2 mm. (3.0 in.)
apart on the swivel mount plate (item 10).

Note: Skip this step if the Swivel Mount is already installed. Also detector

removal for maintenance purpose does not require Swivel Mount removal.
2 Unpack the detector.
3 Place the detector, with its conduit inlets pointing down, on the holding plate of

the swivel mount (item 7). Secure the detector by four (4) 1/4"-20UNC (or M6)

screws with 1/4" (or M6) spring washers from the Swivel Mount Kit (using the

holes (item 5)). Use 3/16 Hex Key for 1/4" screws and No. 5 for M6 screws.
4 Tighten the three locking 3/8"-24UNF screws (item 8) of the swivel mount ring

until the friction in the ball joint holds the detector in its position, maintaining

the ability to be moved by hand-applied force (Use 3/16" HEX KEY).
5 Point the detector towards the protected area and make certain that the view

of the area. Secure the detector in that position by tightening the locking

screws (item 8) of the swivel mount ring.
The detector is now correctly located and aligned and ready for connecting to the

system.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 8: Hydrogen Detector and Swivel Mount Assembly

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Description

1 Protective Set

Screws

2 Ground Terminal

(for ATEX) or
Ground Thread

(for FM)
3 Back Cover
4 Housing
5 Swivel Mount

Screw Hole
6 Swivel Mount
7 Holding Plate
8 Locking Screws
9 Detector

Mounting

Screws

10 Swivel Mount

Plate

11 Swivel mounting

screws

Figure 9: Swivel Mount Assembly - Outline Drawing

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

6.6 Wiring (Refer to Fig. 12)

1 Disconnect power.
2 Remove the four (4) protective set-screws from detector front. (Fig. 8 Item 1)
3 Release the four (4) socket-head screws that secure the detector housing

(Item 1) to its back cover (Item 4) Using HEX KEY No. 5. Hold the housing
(Item 1) during the removal of the screws. With the screws removed, pull the
detector housing (Item 1) from its cover (Item 4). The cover remains attached
to the detector mount. The Terminal Board inside the detector cover is now
revealed.

4 Remove the protective plug mounted on the detector conduit inlet, pull the

wires through the detector cover (Item 4) and secure them firmly to the cover
using the cable-clamp (Item 2) attached to it. Use a 3/4"-14NPT or M25x1.5
explosion-proof conduit connection to assemble the conduit to the detector.

5 Connect the wires to the required terminals (Item 3) according to the wiring

diagram. See paragraph 6.7 and figures no. 10 and no. 11.

6 Connect the grounding wire to the ground screw outside the detector cover

(Item 6).

The detector must be well grounded to Earth Ground for proper
operation.

7 Verify the wiring. Improper wiring may damage the detector.
8 Check the wires for secure mechanical connection and press them neatly

against the terminal board to prevent them from interfering while closing the
detectors’ housing.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

6.7 Terminal wiring (See Fig. No.10 and No.11.)

The detector contains a Terminal Board consisting of two (2) terminal blocks. The
left terminal block is labeled 1 to 7, the right terminal block is labeled 8 to 14.

The following describes the function of each electrical terminal of the
detector:

• Power Supply (Terminal Numbers 1, 2):
Input power -Terminal No. 1.
RETURN - Terminal No. 2.

•

Manual Bit Activation (Terminal No. 3):
Terminal No. 3 is used for the Manual BIT activation. The manual BIT is
initiated by a momentary connection of Terminal No. 3 to the power supply
Return line.

Fault Relay (Terminal Numbers 4, 5):
The Fault output is N.O. SPST relay at Terminals No. 4 and 5. The contacts
are normally energized closed when the detector is in its normal operational
condition.

• Alarm Relay (Terminal Numbers 6, 7, 8):
The Alarm output is a change over contact relay (SPDT).
Terminal No. 6 is the N.O. relay contact.
Terminal No. 7 is the COMMON relay contact.
Terminal No. 8 is the N.C. relay contact.

•

Accessory Relay (Terminal Numbers 9, 10):
The Accessory output is N.O. SPST relay at Terminals No. 9 and 10.
The Accessory relay may act in parallel with the ALARM relay to activate
another external device or it may provide a warning signal, depending on the
Function setup 4.3.1

Note

To protect the dry contacts from voltage surges when connected to reactive
loads (electric motors, sirens, etc.), connect an appropriate varistor over these
contacts.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

•

4-20mA Output

(Terminal Numbers 11, 12):
Terminal Numbers 11 and 12 are used for analog, 4-20mA current output as
specified in paragraph 4.e
Terminal No. 11 - output Terminal.
Terminal No. 12 - input Terminal (see appendix B for more details)

• RS-485 (Terminal Numbers 13, 14):
Terminal Numbers 13 and 14 are used for communication network as specified
in appendix C.
Terminal No. 13 - positive (+) lead.
Terminal No. 14 - negative (-) lead.

Figure 10: Terminal Board

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 11: Flame Detector Assembly - Wiring Diagram

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Description

1 Housing
2 Cable Clamp
3 Terminal Board
4 Back Cover
5 Inlet Conduit
6 Earth Terminal

Figure 12: Hydrogen Flame Detector with cover removed

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

6.8 Operation Mode

When wiring is completed the operational mode can be selected.
Mode selection is achieved through RS-485 using a PC with a Spectrex Host.

Refer to TM784050.

Programmable Function:

Modes of operation are programmable with a PC or Handheld unit according to the
selection table in Paragraph 4.3.1 and Refer to TM 784050.

Address:

The detector has the capability of acting as an addressable device.
The detector provides 247 addresses, which can be used by the RS-485
communications link as described in paragraph 4.3.4 and Refer to TM 784050.

Alarm Delay:

An Alarm Delay may be required for certain applications. The detector has an
Alarm Delay that permits time delays from 0, anti-flare, 3, 5, 10, 15, 20 and 30
seconds respectively. The delay can be defined by the RS-485. See paragraph

4.3.3 and refer to TM 784050.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

7. Operating Instructions

7.1 Scope

The following instructions are designed to obtain optimal performance from the
detector over its life cycle.

7.2 Power-Up

1 Apply power and wait approximately 60 seconds for the automatic self-test of

the detector.
Note: Applying power initiates the following sequence:

•

POWER LED flashes

•

BIT is executed, if successful then

• POWER LED turns ON continuously

•

FAULT relay contacts close

2 Wiring Inspection: If a short-circuit or line discontinuity exists, indications will

appear on the control unit display panel. Review your wiring.

3 The detector goes into its FAULT state when supply voltage drops under

16.5V. The detector status goes back to NORMAL, when the supply voltage is
above 17.5V.

4 Detector Inspection: Visually inspects the viewing window of the detector. It

should be clean and clear. The POWER LED should be ON and the ALARM
LED should be OFF. The ALARM and ACCESSORY relays should be OFF
and the FAULT relay should be ON. The 4-20mA Output should be 5mA.

5 If any of the outputs or indications are different from the description in step 4,

see paragraph 8.6.1 for troubleshooting.

The Flame Detector is now ready for Functional Testing.

7.3 Reset (if optional latching operation selected)

To RESET a detector when in its ALARM state, disconnect power (terminal No. 1
or terminal No. 2), or initiate a manual BIT.

7.4 Functional testing

Following is a testing procedure for proper functioning of the detector. The
detector can be tested using the Manual Built-in-Test.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

7.4.1 Manual BIT Test

Important Note!

If the function setup “Alarm BIT” and/or “Accessory BIT” are in YES, then the
Alarm, Accessory Relay and 4-20mA Output will be activated during a manual
BIT, therefore, automatic extinguishing systems or any external devices that may
be activated during BIT must be disconnected.

1 Verify that the detector is operated properly.
2 Initiate manual BIT. After a few seconds the following occurs:

•

Alarm Relay will be activated and the 4-20mA output turns to 15mA for
3 seconds (only if SW1-4 is ON).

•

Accessory Relay will be activated and the 4-20mA output turns to
10mA for 3 seconds (only if SW1-5 is ON).

•

The 2 LEDs should be ON.

•

Fault Relay will stay active during the test.

7.5 Safety Precautions

After Powering-up, the detector requires hardly any attention in order to function
properly, but the following should be noted:

1 Follow the instructions in the manual and refer to the drawings and

specifications issued by the manufacturer.

2 Do not expose the detector to radiation of any kind unless required for testing

purposes.
3 Do not open the detector housing while power is supplied.
4 Do not touch internal parts. Interference with internal circuits may impair

detector performance and will invalidate manufacturer's Warranty.
5 Disconnect external devices, such as automatic extinguishing systems before

carrying out any maintenance.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

8. Maintenance Instructions

8.1 Scope

This chapter deals with preventive maintenance, describes possible faults in
detector operation and indicates corrective measures. Ignoring these instructions
may cause problems with the detector and may invalidate the warranty. Whenever
a unit requires service, please contact the manufacturer or its authorized
distributor for assistance.

8.2 Maintenance Instrumentation and Personnel

The detectors’ maintenance requires ordinary tools and qualified personnel, who
should be familiar with local codes and practices.

8.3 Preventive Maintenance Procedures

The detector must be kept as clean as possible. The viewing window and the
reflector of the Model 20/20SH Flame Detector must be cleaned on a periodic
basis. The frequency of cleaning operations depends upon the environmental
conditions and specific applications. The fire detection system designer will give
his recommendations.

Use of the optional AIR SHIELD Model 20/20-920 is highly recommended and will
help to keep the window clean and prevent dirt from accumulating on the window.

1 Disconnect power to the detector before proceeding with any maintenance

including lens cleaning.
2 To clean the detector viewing window and reflector use water and detergent,

rinse with clean water.
3 Where dust, dirt or moisture accumulates on the window, first clean with a soft

optical cloth and detergent, then rinse with clean water.

8.4 Periodic Maintenance Procedures

In addition to preventive cleaning and maintenance, the detector should be
functionally tested every six months. This test should also be carried out if, for any
reason, the detector has been opened.

8.4.1 Power-Up Procedure

Perform Power-Up procedure every time power is restored to the system. Follow
the instructions in paragraph 7.2.

8.4.2 Functional Test Procedure

Perform a functional test of the detector as described in paragraph 7.4.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

8.5 Maintenance Records

It is recommended to record maintenance operations performed on a detector in a
system log-book. The record should include information, which identifies the unit,
the installation date, contractor, and entries for every maintenance operation
performed including the description of the operation, date and personnel ID. If a
unit is sent to the manufacturer or distributor for service, a copy of the
Maintenance records should accompany it.

8.6 Troubleshooting

8.6.1 Fault Indication

1 Check power supply for correct voltage, polarity and wiring.
2 Check detector window and reflector for cleanliness. If necessary clean the

window as indicated in paragraph 8.3 and repeat the test.

3 Disconnect the power supply to the system and check the detector's internal

wiring.

4 Reconnect power supply and wait approximately 60 seconds. Repeat the test.

If the indication LED is still blinking, the unit requires service.

8.6.2 False Alarm or Warning Indication

1 Disconnect the power supply from the system and check internal wiring.
2 Reconnect power supply and wait approximately 60 seconds. If indication

remains, the unit requires service.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Appendix A - Wire Selection Tables

General Instructions For Electrical Wiring

1. Refer to Table 12 to determine the required wire gauge for general wiring,
such as relay wiring. Calculate the permitted voltage fall with respect to
loads current, wire gauge and length of wires.

2. Refer to Table 13 to select wire gauge for power supply wires. DO NOT
connect any circuit or load to detectors’ supply inputs.

Table 12: Maximum DC resistance at 68˚F for copper wir e

AWG # mm2 Ohm per 100 ft. Ohm/100

meter
26 0.12 - 0.15 4.32 14.15
24 0.16 - 0.24 3.42 11.22
22 0.30 - 0.38 1.71 5.60
20 0.51 - 0.61 1.07 3.50
18 0.81 - 0.96 0.67 2.20
16 1.22 - 1.43 0.43 1.40
14 1.94 - 2.28 0.27 0.88
12 3.09 - 3.40 0.17 0.55
10 4.56 - 6.64 0.11 0.35

A. Select "Number of detectors" connected in one circuit.
B. Select "wiring length" per your installation requirements.
C. Refer to "power supply range" for voltage extreme applied.

Table 13. Wiring length in feet (meter)
No. of
Detectors

24 18 16 14 - - 22-32
20 18 16 14 - - 22-32
16 20 18 16 14 - 22-32
12 20 18 16 14 - 20-32
8 20 18 16 14 - 20-32
4 and less 20 18 16 16 14 20-32

Feet 164 328 492 656 820

(meters) (50) (100) (150) (200) (250)

Max. Length from Power Supply to Last

Recommended Wire Diameter Power Supply

Range (VDC)

Detector

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Appendix B – Typical Wiring Configurations

Figure 13: Flame Detector Wiring Diagram

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 14: Typical wiring diagram for 4 wire controllers

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 15: Typical wiring diagram for controllers with alarm & fault loops

Notes:

1. For EOL Resistors Values See Controller Manual

2. The Accessory Relay in The Last Detector Should be Configured as an EOL

(Function “EOL” at YES)

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 16: 4-20mA wiring

Notes:
The detectors are factory set to isolated 4-20mA ‘sink’ version.

To work at non-isolated 4-20mA ‘source’ version, connect Terminal 12 to Terminal

1. The 4-20mA meter is connected between Terminal 11 and Terminal 2.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Appendix C – RS-485 Communication Network

Using the RS-485 network capability of the Hydrogen detector and additional
software, it is possible to connect up to 32 detectors in an addressable system
with 4 wires only (2 for power & 2 for communication). Using repeaters, the
number of detectors can be much larger (32 detectors for each repeater) up to 247
on the same 4 wires. When using the RS-485 network it is possible to read each
detector status (FAULT, WARNING, ALARM) and to initiate a BIT to each detector
individually.

Fore more details, consult the factory.

Figure 17: RS-485 networking

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Appendix D - Mounting the “EExde approved”
version

The EExde approved version provides an additional EExe terminal box attached
below the EExd detector and therefore allows easier access in hazardous areas
(see fig. 18). The detector is prewired to the terminals in the additional EExe
terminal section ready for field wiring connections
Due to restricted number of terminals, there are two options for this pre-wiring
(paragraph 2.1)

• RS-485 & 4-20mA

•

Alarm & Fault Relays

1. Detector Mounting

The detector may be mounted on a simple fabricated bracket, or preferably the
optional Swivel Mount, Model 20/20-003. The Swivel Mount enables the detector
to be rotated up to 40 degrees in all directions.

1.1 Swivel Mount Kit - Use the kit from the paragraph 6.5.1

1.2 Swivel installation

1 Refer to Fig.8 and Fig 9. Place the swivel mount (item 6) in its designated

location and secure it with four (4) M6 or 1/4" screws (item 11)
(recommended), placed 76.2 mm. (3.0 in.) apart on the swivel mount plate
(item 10).
Note: Skip this step if the Swivel Mount is already installed. Also detector
removal for maintenance purpose does not require Swivel Mount removal.

2 Unpack the detector.
3 Place the detector, with its conduit inlets pointing downwards, on the holding

plate of the swivel mount (Fig. 9 item 7). Secure the detector by four (4) M6
screws with M6 spring washers from the Swivel Mount Kit using the holes
(Fig. 9 item 5). You can use the thread on the modified cover (Fig. 18 item 1)
marked either triangle symbol or square symbol. Use No. 5 Hex Key for M6
screws.

4 Tighten the three locking 3/8"-24UNF screws (Fig. 9 item 8) of the swivel

mount ring until the friction in the ball joint holds the detector in its position.
Yet, still permits it to be moved by hand-applied force (Use 3/16" HEX KEY).

5 Point the detector towards the protected area and make certain that the view

of the area. Secure the detector in that position by tightening the locking
screws (Fig.9 item 8) of the swivel mount ring.

The detector is now correctly located and aligned and ready for connecting to the
system.

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

2. W

IRING

(REFER TO FIG. 18.)

1 Disconnect power.
2 Release the four (4) slotted-head screws (item 3) that secure the terminal box

cover (Item 2). The terminal box is now revealed.

3 Remove the protective plug mounted on the detector conduit inlet, pull the

wires through the terminal box (Item 7). Use M25x1.5 EExe cable glands to
assemble the cable to the detector/terminal box.

4 Connect the wires to the required terminals (Item 4) according to the wiring

diagram. See paragraph 2.1 and figures no. 19 and no. 20.

5 Connect the grounding wire to the ground screw outside the detector cover

(Item 5).

The detector must be well grounded to Earth Ground for proper
operation.

6 Verify the wiring. Improper wiring may damage the detector.
7 Check the wires for secure mechanical connection and press them neatly

against the terminal to prevent them from interfering while closing the cover
(Item 2).

8 Place and secure the terminal box cover(Item 2) using four (4) slotted-head

screws (Item 3).

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Figure 18: Flame Detector Assembly - Wiring Diagram

Description

1. Modified Back Cover 5. Ground Terminal

2. EExe terminal box Cover 6. Mounting Thread

3. Slotted Screw 7. EExe terminal box

4. Terminal Block 8. Cable Inlets

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Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

2.1 Terminal Wiring

The detector contains an EExe chamber consisting of a terminal block (Item 4).
The terminal block is labeled 1 to 6. (See Fig. No.18)
The following describes the function of each electrical terminal of the detector:
There are two options:

RS-485 & 4-20mA Version

Option A (See Fig. No. 19)

Power Supply

(Terminal Numbers 1, 2):

Input power is supplied to Terminal No. 1.
RETURN is connected to Terminal No. 2.

RS-485 (Terminal Numbers 3, 4):

Terminal Numbers 3 and 4 are used for
communication network as specified in
appendix C.
Terminal No. 3 is the positive (+) lead.
Terminal No. 4 is the negative (-) lead.

4-20mA Output (Terminal Numbers 5,

Terminal Numbers 5 and 6 are used for

6):

analog, 4-20mA current output as specified
in paragraph 5.e
Terminal No. 5 is used as output Terminal.
Terminal No. 6 is used as input Terminal.
(see appendix B for more details)

Alarm & Fault Relays Version

Option B (See Fig. No. 20)

Power Supply

(Terminal Numbers 1, 2):

Input power is supplied to Terminal No. 1.
RETURN is connected to Terminal No. 2.

Alarm Relay (Terminal Numbers 3, 4):
The Alarm output is a NO. SPST
contact at Terminal Numbers 3 and 4.
The contacts are closed at Alarm
Mode.

Fault Relay (Terminal Numbers 5, 6):
The Fault output is N.C. SPST contact
at Terminal Numbers 5 and 6. The
contacts are open at Fault condition.

Figure 19: OPTION A

Flame Detector Assembly - Wiring

Diagram (“de version”)

Figure 20: OPTION B

Flame Detector Assembly - Wiring

Diagram (“de version”)

48

Spectrex Inc. - SharpEyeTM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005

Technical Support

For all technical assistance or support, contact:

218 Little Falls Road
Cedar Grove, NJ 07009, USA

Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web-site: www.spectrex.net

Your Local Office:
SPECTREX INC.

Texas (USA)

Mr. Jay Cooley, Regional Sales Manager
16203 Park Row, Suite 150
Houston, Texas 77084
USA

Phone: [phone]
Email: [e-mail]

Europe

Mr. Ian Buchanan, Regional Manager
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Glasgow G66 3TJ
United Kingdom

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Far East

Mr. Deryk Walker, Regional Sales Manager
59 Fen Ji Hu, Danshui
Taipei County 25163

Taiwan (ROC)
Phone: [phone]
Mobile: [phone]
Email: [e-mail]

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