Chentronics Iscan3 series User manual

MNL-ISCAN3, REVB INSTALLATION & OPERATION MANUAL Page 1 of 25

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KEEP THIS MANUAL IN A SAFE PLACE FOR FUTURE REFERENCE!

Read this manual before using this product. Failure to follow the instructions and safety precautions in this manual can result in

serious injury or death or damage to equipment.

Applicable Scanner Part Numbers

Contact Technical Support +1.866.821.5504 with any questions.

For a list of relevant patents and trademarks, please see http://www.chentronics.com/legal-notices.

PART NUMBER

MODEL

AREA CLASSIFICATION

TEMP RATING

FEATURE

CONNECTOR PINS

04004999-MB

iS3-MB

CLASS I/DIVISION II

-40°C to 80°C

Fully Programmable –Must Be

Configured Prior to Use

04004999-SB

iS3-SB

CLASS I/DIVISION II

-40°C to 80°C

Limited Programmability

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Contents 
IMPORTANT SAFETY INFORMATION..................................................................................................................................................3 
CUSTOMER SUPPORT ........................................................................................................................................................................5 
PRODUCT FEATURES..........................................................................................................................................................................6 
EASE OF INSTALLATION ................................................................................................................................................................................6 
THERMAL PROTECTION................................................................................................................................................................................8 
TECHNICAL SPECIFICATIONS ..............................................................................................................................................................9 
DEFINITIONS..............................................................................................................................................................................................9 
SPECIFICATION TABLE................................................................................................................................................................................10 
Technical Specification NOTES ........................................................................................................................................................11 
DEFAULT CONFIGURATION (SETTINGS)..........................................................................................................................................................12 
WIRING INSTRUCTIONS ...................................................................................................................................................................13 
WIRING DIAGRAM....................................................................................................................................................................................13 
Wiring Notes ...................................................................................................................................................................................13 
CABLE CONNECTION..................................................................................................................................................................................16 
POWER/CONTROL CABLE INSTALLATION .......................................................................................................................................................16 
LOCKING NUT INSTALLATION ......................................................................................................................................................................16 
COMMUNICATIONS WIRING ...........................................................................................................................................................18 
RS-485..................................................................................................................................................................................................18 
“DAISY CHAIN”CONFIGURATION.................................................................................................................................................................19 
SPLIT OR “Y” CONFIGURATION....................................................................................................................................................................20 
REMOTE FILE SELECT.................................................................................................................................................................................21 
SIGHTING THE SCANNER..................................................................................................................................................................22 
FLAME LINE OF SIGHT................................................................................................................................................................................22 
RING OF LIGHT SCANNER STATUS DISPLAY.....................................................................................................................................................23 
MAINTENANCE................................................................................................................................................................................24 
CLEANING THE LENS..................................................................................................................................................................................24 
SPECIAL,“X”, CONDITIONS OF USE..............................................................................................................................................................25 
 
 

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IMPORTANT SAFETY INFORMATION

Read All Instructions before Using Equipment

The instructions provided in this manual have been prepared to serve as a general guide. It is intended for use by

qualified personnel with knowledge of equipment of this type. It is not intended to cover all possible variations in

equipment or to provide for specific operating problems which may arise.

You are responsible for adhering to all warnings or cautions provided in this Manual.

In addition to any general safety measures provided in this Manual, you must comply with all current national, state,

local and company safety regulations at all times.

Safety Symbols used in this manual comply with ISO 3864.

THESE SYMBOLS ARE USED TO ALERT YOU TO POTENTIAL PERSONAL INJURY HAZARDS.

OBEY ALL SAFETY MESSAGES THAT FOLLOW THESE SYMBOLS TO AVOID POSSIBLE INJURY OR DEATH.

Indicates a hazard with a high level of risk which, if not avoided will result in death or

serious injury.

Indicates a hazard with a medium level of risk which, if not avoided could result in

death or serious injury.

Indicates a hazard with a low level of risk which, if not avoided will result in minor or

moderate injury.

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EXPLOSION HAZARD

Do not open the equipment cover or service the equipment if an explosive atmosphere may be present.

Equipment must be installed and serviced by qualified personnel in accordance with applicable local and

national codes, standards, and ordinances.

Lisez toutes les instructions avant d'utiliser l'équipement

Les instructions fournies dans ce manuel ont été préparées pour servir de guide général. Il est destiné à être utilisé par

du personnel qualifié connaissant l'équipement de ce type. Il n’est pas destiné à couvrir toutes les variations possibles

d’équipement ni à régler les problèmes de fonctionnement spécifiques qui peuvent survenir.

Vous êtes responsable du respect de tous les avertissements ou mises en garde fournis dans ce manuel.

En plus des mesures de sécurité générales fournies dans ce manuel, vous devez respecter à tout moment toutes les

réglementations de sécurité nationales, nationales, locales et de l'entreprise.

Les symboles de sécurité utilisés dans ce manuel sont conformes à la norme ISO 3864.

CES SYMBOLES SONT UTILISÉS POUR VOUS AVERTIR DES RISQUES DE BLESSURES POTENTIELS.

RESPECTEZ TOUS LES MESSAGES DE SÉCURITÉ QUI SUIVENT CES SYMBOLES POUR ÉVITER LES BLESSURES POTENTIELLES OU LA MORT.

Indique un danger avec un niveau élevé de risque qui, s’il n'est pas évité, entraînera la

mort ou des blessures graves.

Indique un danger avec un niveau de risque moyen qui, s’il n'est pas évité, pourrait

entraîner la mort ou des blessures graves.

Indique un danger avec un niveau de risque bas qui, s’il n'est pas évité, entraînera des

blessures mineures ou modérées.

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TENSION DANGEREUSE

N'ouvrez pas le capot de l'équipement et ne le réparez pas si une atmosphère explosive peut être

présente. L'équipement doit être installé et entretenu par du personnel qualifié conformément aux codes,

normes et ordonnances locales et nationales applicables

Customer Support

For Technical Support

Inside USA Call: 866.821.5504

Outside USA Call: +1.607.334.5531

Website: www.chentronics.com

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Product Features

The iScan3 flame scanner is designed to detect flame from fossil fuels such as natural gas, refinery gas, waste gas, fuel oils,

biomass and coals. The iScan3 consists of an integrated viewing head and signal processor. No secondary signal processor or

amplifier is required.

Ease of Installation

QUICK-CONNECT BURNER MOUNT:

The simple cam-and-groove mechanism allows for quick mounting, release, and rotation of the scanner.

QUICK CONNECT I/O CABLE:

The iScan3 input connector allows quick disconnect even in hazardous areas

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LED STATUS INDICATORS; “Ring of Light”:

The iScan3 is equipped with a highly visible LED status indicator ring. This “Ring of Light” communicates the scanner’s

operating modes including FLAME SIGNAL STRENGTH, GAIN LEVEL (the amount of signal amplification), and

WARNINGS/FAULTS. This ring aids with “sighting”the flame; or in other words: proper aiming of the scanner. This

must be done with care to ensure that a good flame signal is present over a range of operating conditions. With the

“Ring of Light”, the operator can quickly recognize marginal conditions (such as low flame strength and/or high gain).

REMOTE FILE SELECT

The Remote File Select feature provides a means for selecting one

[A1]

of the configuration files resident within the

scanner. Single-Burner, “SB”, models have limited programmability while Multi-Burner, “MB”, models have a high

degree of programmability, as outlined in the table below.

SCANNER

PART NUMBER

USER PROGRAMMABLE FEATURES (with iScan Software)

4-20 mA

SIGNAL

MAPPING

4-20 mA

Calibrate

4-20 mA

Gain

SECONDARY

RELAY:

Redundant

Flame N.O. or

N.C. -or-

Fault N.O. or N.C.

DETECTION

SETTINGS:

Gain, Freq,

Threshold

MULTIPLE

SETUP

FILES

(max of 4)

RESPONSE TIMES

(FLAME ON/

FLAME OFF)

04004999-SB

YES

04004999-MB

YES

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Thermal Protection

The iScan3 Flame Scanner has redundant safety features for exposure above the maximum temperature rating. The modes of

operation are described below:

Mode

Internal Temperature (TINT)

4-20 Output Setting

Indicator Light Setting

Relay Operation

Normal

TINT ≤ 95°C

Normal (4-20 mA)

Normal

Warning

95°C < TINT < 100°C

3mA steady

Alternate left half yellow 0.5s

/ right half yellow 0.5s

Normal

Fault

100°C < TINT ≤ 105°C

2mA steady

Blink yellow 0.5s on 0.5s off

Relays Open and will not

Disable

TINT > 105°C

1mA steady

Yellow Solid

Relays Permanently Open

and will not Close

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Technical Specifications

Definitions

FLICKER –Flicker or Flicker Frequency refers to the modulation of flame intensity due to micro-explosions.

FDORT –Flame Detector ON Response Time –the period of time from flame intensity rising above the user adjustable

threshold to flame relay contacts closed.

FDRT –Flame Detector Response Time –the period of time between the loss of a sensed flame and the signal

indicating the absence of flame.

MFFRT –Marginal Flame Fail Response Time –period of time from flame intensity falling below the the user

adjustable threshold to the flame relay contacts open.

ROL –Ring of Light –multi-colored LED status indication on the back of the scanner.

iScan Software –Flame Scanner Communications software used to monitor and configure the iScan3 device.

GAIN –When a signal is amplified, GAIN is the ratio of the amplified signal relative to the original.

DISCRIMINATION –The ability to distinguish between multiple flames. An example of good discrimination is when

the MB scanner is able to recognize a pilot flame with other burner’s main fuel flame in the background. The status of

the background Flames

[A2]

does not affect the ability to detect the pilot flame (ON or OFF).

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Specification Table

AREA CLASSIFICATION

Hazardous/Non-Hazardous Area

Part Number

PN 04004999-SB, 04004999-MB

Area Classification

Input Cable

Quick Disconnect - Separate Cable

Weight

2.25 lb. (1.02 kg)

Mounting

1” NPT(F)

Purge Air NOTE 1

Flow

Pressure

5 scfm (8.5 Nm3/hr)

5” w.c. (13 mbar)

ROL - Ring of Light Status

Indicator

Color Coded Status

Field of View

6 Degrees

Optics

Quartz Lens

Sensor Type

Solid-State

Sensor Range

300 nm 750 nm

Communication

USB/RS485: up to 127 up to a distance of 4000 Ft. (1200 M).

Temperature

-40°C to 80°C

Humidity

0 to 100% Relative Humidity, Condensing

Input Power NOTE 2

24 VDC, +10%/-15%, 5.28 W (220 mA)

Relay Contacts NOTE 3

Primary Relay with Normally Open and Normally Closed Voltage Free Contacts (i.e.

NO contact closes when flame is detected, NC opens when flame is detected)

Secondary Relay with Voltage Free Contacts

(configurable as NO Flame Relay or Fault Relay configurable as NO or NC contacts)

0.125A @ 250 VAC Resistive Load

0.250A @ 125 VAC Resistive Load

1.0 A @ 24 VDC Resistive Load

Signal Output NOTES 4,5

Output #1, 4–20 mA, Flame Signal

Output # 2, 4-20 mA, Selectable as Gain or Internal Temperature

Maximum Current Loop Resistance = 750 ohms

FDORT (FLAME ON)

Configurable from 1-4 seconds in 1 second increments

FDRT (FLAME OFF)

Configurable from 1-4 seconds in 1 second increments

MFRRT

Configurable from 1-6 seconds in 1 second increments

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AREA CLASSIFICATION

Hazardous/Non-Hazardous Area

Part Number

PN 04004999-SB, 04004999-MB

Safety Integrity Level (SIL3)

Data

PFDavg = 938.369 X 10-6

λS = 1.14 X 10-6

λDD = 2.1705 X 10-6

λDU = 0.0219 X 10-6

SFF = 99.1%

Proof Test Interval

time = 1 year (8760 Hrs) NOTE 6

Technical Specification NOTES

Note 1 Purge air pressure is the minimum differential pressure required between the purge air supply pressure at “Y”

(scanner connection) and the back pressure.

Note 2 24 VDC Power supply to iScan3 must not include any inductive load.

Note 3 To achieve higher relay contact voltages, use iScan3 relay contacts to energize the coil of an interstitial relay.

Note 4 Output for monitoring only. Not to be used to prove flame.

Note 5 4-20 mA outputs are calibrated at the factory to a known load. Monitoring hardware will have an impact of the

current output. For accurate readings, 4-20 mA output(s) should be calibrated using a milli-ammeter between the

scanner’s 4-20 mA output and the monitoring hardware. Refer to the 4-20 ma Settings section MNL- iScan

Software for details on how to execute the calibration procedure.

Note 6

SUGGESTED SIL3 PROOF TESTS:

An annual proof test is good practice to meet the requirements in terms of IEC61508. According to section

7.4.3.2.2 f of IEC61508 proof tests shall be undertaken to reveal dangerous faults which may be undetected

by diagnostics test.

Flame OFF: Shutdown the burner and ensure that the flame off condition is detected and signaled by the

flame detector as a flame off condition.

False Flame: Verify that prior to start up (no flame present) there is no indication of a flame on condition

(false flame signal) on the flame scanner (this is typically integrated within the BMS as a pre-start permissive

to prevent start up if a false flame condition is detected. This should not be considered a replacement for

recommended testing of the scanner adjustments which are required to be verified each time the scanner is

commissioned, adjusted, settings are changed or re-commissioning takes place. In these cases, only qualified

personnel who have been trained and are experienced should make such adjustments.

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Default Configuration (Settings)

As part of setup in iScanSoftware, each scanner is assigned unique addresses.

Flame Detector On Response Time (FDORT)

2 seconds nominal

Flame Detector Response Time (FDRT)

1 second nominal

Marginal Flame Failure Response Time (MFFRT)

2 seconds nominal

Gain Configuration

Manual

Gain Channel

High

Signal Gain

3.5

Flame Flicker Frequency

26 Hz

Flame Flicker Bandwidth

12 Hz

Flame Flicker Threshold

-45 dB

Mains Filter

Enabled

Rail Filter

Enabled

Solar Filter

Enabled

Flame Filter

Enabled

The following settings apply to the overall scanner and not to an individual scanner file:

Communications Address

COMM 1NOTE 1

Active File

Remote File Select

Disabled

Multiple Fuels

Disabled

4 To 20 mA Gain

1 mA/dB above

threshold

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Wiring Instructions

All wiring shall be done in accordance with all applicable local and national codes, standards, and ordinances. The

scanner has a quick connect cable. This cable does not require a flexible conduit if permitted by local authority.

Connections for power, Earth Ground, and Flame Relay (N.O. and Common) are required for all applications. Use of

the 4-20 mA outputs, Communications, and connections are “as-required” for each application.

Wiring Diagram

Wiring Notes

Note 1 If more than one 24 VDC supply is required, the 24 VDC returns labeled as “DC (-)” shall be connected to each

other.

Note 2 If more than one 24 VDC supply is required, the 24 VDC source connections labeled as “DC (+)” shall be

isolated from all other power supplies. If switching power supplies are used the supplies may be connected via a

wired OR diode configuration. NOTE: the BLOCKING DIODE must be rated for a minimum of 50 volts and 10 Amps.

Note 3 The 24 VDC return, “DC (-)”, shall be used as the low side of the File Select relays.

Note 4 The 24 VDC return, “DC (-)”, is the return for the 4–20 mA output loop(s). Input must be isolated type.

Maximum current loop resistance is 750 ohms.

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Note 5 Connect the scanner Earth GND (Green/Yellow, 8, <H>) to EARTH GROUND. A short BRAIDED CONDUCTOR

(alternately a short AWG #12 wire) is recommended.

Note 6 All shields are tied to Earth Ground in the Control Panel only.

Electrical noise interference from high voltage/energy ignition sources can adversely affect the operation

of the flame scanner. To minimize the possibility of electrical noise interfering with the operation of the

flame scanner:

•Do not install ignition wires in the same conduit as the scanner wires.

•Ignition Systems shall have a dedicated return.

•Do not mount an ignition transformer in the same enclosure where the flame scanner wiring is

terminated.

•Ignition cables shall be routed a minimum of 12” (305mm) from scanner wiring at all times.

•iScan3 complies with IEC 61000-4-3 (RF Radiated Immunity).

Earth GND

GREEN/YELLOW (8) <H> CONNECT TO EARTH

GROUND. (See section on grounding methods)

CONNECT ALL SHIELDS AT ONE END ONLY TO EARTH GROUND.

DO NOT GROUND SHIELDS AT THE LOCAL JUNCTION BOX.

Earth Ground

Located at CONTROL PANEL

ALL OTHER CONNECTIONS

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•Les interférences électriques provenant de sources d'allumage haute tension / énergie

peuvent nuire au bon fonctionnement du scanner à flamme. Pour minimiser les risques

d'interférences électriques avec le fonctionnement du scanner à flamme:

•Ne pas installer les câbles d'allumage dans le même conduit que les câbles du scanner

•Les systèmes d'allumage doivent avoir un retour dédié

•Ne montez pas de transformateur d'allumage dans le même boîtier que le câblage du scanner

à flamme

•Les câbles d’allumage doivent être acheminés à au moins 12 pouces (305 mm) du câblage du

scanner en tout temps.

•iScan3 est conforme à la norme IEC 61000-4-3 (Immunité par rayonnement RF).

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Cable Connection

Power/Control Cable Installation

The iScan3 system utilizes a quick disconnect connector to connect the power/control cable to the electronics.

To connect the power cable to the electronics, first turn the locking nut clockwise by hand until it is seated against the

electronics. This will ensure the locking nut is not too far out and will allow the connector to properly seat. Then, align the

connector on the cable with the connector on the electronics, insert the connector, and turn the outer barrel clockwise until

the banjo fittings on the connector are seated and latched.

FIGURE A:CLEAR THE LOCKING NUT THEN ALIGN AND INSERT THE CABLE CONNECTOR.

Locking Nut Installation

The equipment features a locking nut that locks the cable to the equipment so that it may not be removed without the use of

a tool. This feature is required for some hazardous area installations. To lock the connector in place, turn the locking nut

counter-clockwise tighten to a torque of 10ftlbs using a wrench. See Figure B and Figure C for illustration of locking nut

tightening.To remove the cable, turn the locking nut clockwise until it is seated against the electronics, then remove the cable

connector by turning the outer barrel counter clockwise until the banjo fittings unseat and the connector unseatS

[A3]

and can

be removed.

Scanner

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FIGURE B: SEAT THE CONNECTOR AND SEAT THE LOCKNUT AGAINST THE CONNECTOR BARREL.

FIGURE C: TIGHTEN LOCKING NUT AGAINST CONNECTOR BARREL.

EXPLOSION HAZARD

DO NOT CONNECT OR DISCONNECT WHEN ENERGIZED

TENSION DANGEREUSE

NE PAS CONNECTER OU DÉBRANCHER LORSQUE ÉNERGÉ

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Communications Wiring

RS-485

Communication with the iScan3 is RS-485 via a USB to RS-485 Converter (PN 3425-057-01). RS-485 is a differential multi-drop

network. For iScan3, the network is a half-duplex, 2-wire, echo-off configuration operating at 19200 KBAUD. The maximum

allowable number of nodes on a given section of the network is 32 including the USB to RS-485 converter and any repeaters. If

more than 32 loads are connected (1 USB converter, 1 RS-485 repeater and 30 iScan3s) then an RS-485 repeater is required

between sections to boost the signal. The repeater must be compatible with the EIA-485 standard, must have input to output

DC isolation, must operate on 24VDC over the operating temperature range of -30°C to +70°C and must have agency

approvals sufficient to meet the area classification.

NOTE: When calculating 32 loads, include the USB to RS-485 converter and the number of repeaters in a section).

For the extended sections, up to 30 iScan3s may be connected. The maximum length of any given section is 4000 FT

(1200 M).

B&B Electronics 485 repeater model 485OPDRI-PH meets these requirements. Additional repeaters may be added to extend

the network to 127 scanners. If

[A4]

using the B&B Electronics 485 repeater model mentioned above, configure the DIP

switches on ports as follows:

OFF

Since there is no dedicated signal reference, the 24 VDC return labeled as DC (-) is used. The USB to RS-485 and the Repeaters

must have their GND terminals connected to the DC (-) as well. Failure to provide the signal reference may result in

communication errors and potentially damage the iScan3.

The recommended topology is “Daisy Chain” as shown in the wiring diagrams below. A split or Y configuration is acceptable.

NO OTHER CONFIGURATION IS ACCEPTABLE. Please refer to the EIA-485 specification for further information on RS-485

networks.

COMMUNICATION WIRING SUMMARY:

•Wiring must be twisted pair shielded cable. Ground the shield only at the control panel to prevent ground loops.

•Use only “Daisy Chain” or “Y” configurations. Connect all of the “Com A” wires together. Connect all of the “Com B” wires together. Make sure that the

“Com A” and “Com B” wires are connected to the correct terminals on the converter.

•An RS-485 repeater is required for every 30 scanners or 4000 ft (1200 m) of length for a maximum of 127 scanners in a network.

•Ensure the DC (-) of all scanners are tied together as a reference for RS-485 communications. The GND terminal of the USB to RS-485 converter and the