iLELGAS SENSOR

002707

Issue 3

Combustible Gases and Vapours (LEL) Sensor
Intelligent Series Gas Sensor (iseries)
DOCUMENT PURPOSE
The purpose of this document is to present
the performance specification of theintelligent iLEL75 combustible gases andvapours gas sensor. This document should
be used in conjunction with the Product
Safety Datasheet (PSDS 22). For guidanceon the safe use of the sensor, please referto the Communication Protocol (SDCS)
and Sensor Mounting Application Note.

PORTFOLIO

Compact, digital andintelligent gas sensors, iseries
sensors are precalibrated,interchangeable and feature digital
traceability. These sensors are rated
for longer life and are designed tooperate in extreme environmental
conditions.

2 YEAR WARRANTY(24 months from date of despatch)

Combustible Gases and Vapours(LEL) Sensor: iLELPart Numbers:
PM 979-600D-CIT (for iLEL75);
PM 989-600D-CIT (for iLEL75C);
PM 999-600D-CIT (for iLEL75M)

FEATURES AND BENEFITSUARTDigital interface –The sensor has a UART
protocol to communicate
with the instrumentwith chip select option
as described in theCommunication Protocol(SDCS)Interchangeable –All intelligent sensors
have the same dimensions
and communication
protocol. All sensors in
the range will work with asupply voltage from 3.1 V
to 3.3 VOEM lock – Sensors have two levels of lock codes.
The first one is an OEM specific code programmed induring manufacture and cannot be modified. This lockcode is provided by the OEM. Instrument can check if
the sensor has the unique code – if not the instrument
can refuse the sensor. The second level of lock code isleft blank and can be updated by OEM/Partners during
sensor integration into the instrument as needed

Digital traceability –Sensors contain thefollowing data: serial
number, manufacturingdate, and gas typefor quick and easy
identification of thesensor

Pre-calibrated –Sensors will be calibrated
during manufacturing andcalibration data is written
in the sensor. Sensor will
output gas concentration
when interrogated byinstrument

Compact form factor
Five-year life
RoHS compliant

Designed to meet global performance standards
ATEX and IEC Ex Certified per EN IEC 60079-0,EN IEC 60079-1, EN IEC 60079-11 and EN 50303
UL Recognized for US and Canada in File E180262.
Consult page 4 and 5 for full details

TABLE 1. LEL SENSOR VARIANTS
SENSORiLEL75iLEL75CiLEL75M

Target Gas
Inboard Filter

Combustible gases and vapours
To remove H2S

Combustible gases and vapours up to C6
To remove H2S

Additional Filter

None

Silica filter to improve silicone resistance

Methane and hydrogen
To remove H2S
Carbon cloth filter to improve silicone
resistance
PM999-600D-CIT

Catalogue Listings PM979-600D-CIT

PM989-600D-CIT

INTELLIGENT SERIES GAS SENSORS (iSERIES)iLEL SERIES

Poison ResistanceResistant to H2S poisoning
Superior silicone resistance

Response Time*<20 seconds to CH4

Overload

100 % LEL

Output% LEL target gas output
Compensated for temperature

Measurement Interval

1 sample per second (1 Hz)

Linearity*

Linear up to 5 % vol. CH4

Measurement Accuracy

5 % LEL

Resolution

1 % LEL

Dead Band

Configurable

Warm-up Time

15 seconds

Serial Comunication

UART with Chip Select

ENVIRONMENTAL

Operating Humidity
Range

0 to 95 % RH (non-condensing)Operating Pressure
Range

600 mbar to 1200 mbar

Flow Rate

10,00 ±0,1
20,00 ±0,15(including label)

Elastomer seal(Ø14,0 ID x 1,53)

à (O-ring)(ty 1.0°p. draft)à For mounting andsealing around sensor,
refer to iseries Sensor
Mounting Application
Note.

10,80

1,00

5,40

-20°C to 60°C**** Can be operated from -40°C to -20°C,
see characterisation note for details.

Typical: 200 ml/min when using
recommended gassing hood.
(Consult iseries Sensor Mounting
Application Note.)

All dimensions in mm
14,20
7,25

Operating Temperature
Range

Do not obscuredust cover area

20,00 ±0,15 (including label)

1000 ppm hr minimum

2,00Inboard Filter Capacity(10,30)0 % to 100 % LEL

with dust coverRange

Ø12,00(Dust Cover)

10,00 ±0,1

Catalytic Oxidation°
45.0

Operating Principle

Product Dimensions
10,00 ±0,1

MEASUREMENT

7,00 ±0,1

TABLE 2. TECHNICAL SPECIFICATIONS

Do not connect tounlabeled pins.

LIFETIME

Long-Term Output
Drift*<3 % signal per monthLong-Term Baseline
Drift<5 % LELmethane per month

3,60 3,60

Expected Operating Life 5 years in air

TABLE 3. ELECTRICAL SPECIFICATIONS
Min.
Max.

Typ.

Unit

PHYSICAL CHARACTERISTICS

Supply Voltage (Vdd)

3.1

3.3

3.2VdcWeight<6 gVoltage on any pin

03.3–

Vdc

Contact Material

Gold plated

0.82

1.4

1.4mA

O-Ring Material

FKM60 ±5 shore A

Outer Plastic Body
Material

769080mA

PPS Fortron 1140L4

Current: at stand-by mode
(sleep mode)
Current: at active mode
Power consumption at work
mode

235.6

297

256mW–30–s* Specifications are valid at 20°C, 50% RH, and 1013 mBar using Honeywellrecommended circuitry. Performance characteristics outline the performance ofsensors supplied within the first three months. Output signal can drift below thelower limit over time.

Start-up time

For compatibility with the whole iseries range, the supply voltage should bebetween 3.1 V and 3.3 V.

TABLE 4. PINOUT
PinDescription+V

Positive power supply-V
Rx

GroundData transmitted from instrument to sensor

Tx

Data transmitted from sensor to instrument

CS

Chip SelectiLEL Series Gas Sensor Datasheet | sps.honeywell.com/ast | 2

INTELLIGENT SERIES GAS SENSORS (iSERIES)iLEL SERIES

Configurable Range

OEM code(First layer)

Password iscustomisable.*(NoLock will be set bydefault in case the OEMlock is not required)No more than 6 characters(ASCII format)üPartner code
(Second layer)–No more than 6 characters(ASCII format)

Notes

Once this code has been set by user, it is not possible tochange it

User factor 0: 100
User factor 1: 95
UF 2-3: Reserved
UF 4-9: Customisable–––––––––––
User factors can beadded to include
auto-compensation forusing different membranes or instruments

ü*** User factor 0 and 1 programmed into the sensor during
manufacturing. Additional User Factors can be added to theselectable list during the manufacturing process. This user
factor has to be provided by the user.
** Users can select the desired user factor from theselectable list% LELüThe gas concentration can be configured to measure either%LEL or %VOL

Zero (clean air)

0 % LELûSpan (target gas)

50 % LELüLow

10 % LEL

High

20 % LEL

10 allocated slots–––––––––––
2 user factors arealready implemented (noadditional membrane
and with recommended
membrane), 2 are reservedand the remaining 6 can becustomised

Limit LOW lower: 3Limit LOW upper: 60Limit HIGH lower: 3
Limit HIGH upper: 60

ü*Calibration is performed at two points throughout theoperating range of the sensor. The calibration points
are defined by the zero and span values. The zero value
represent the response of the sensor in clean air
Span is the calibration point that is done in the presence ofthe target gas. The span concentration can be configured
through the communication protocol. The span gas is
50 %LEL, or 2.5 %v/v methane, as per standard EN 50054

üü

The alarm will be flagged when the countdown reaches 0üThe countdown restarts when the sensor is calibrated. No
predictive element for LEL

CH4

ü

The sensor can be configured to measure different targetgases. Including CH4, C4H10, H2, C5H12, C3H8CH4

üThe sensor can be calibrated with the different gases (CH4,C4H10, H2, C5H12, C3H8). It is recommended to calibrate withthe target gas

Countdown timer

1825 daysûThe countdown timer is set for 1825 days, i.e. 5 years. No
predictive element for LEL

Active by defaultüüIncoming

1 % LEL

Whole measurement rangeüOutgoing

3 % LEL

Incoming < Outgoingü

Compliance
Bump
Standard
Due Days

DeadbandEnd ofLife

180 days

TargetGas

Countdown timer(Cal due days)

Calibration
Gas

Predictive
calibration

AlarmsCalibrationüUser Factor* OEM code will be set by Honeywell during sensor
manufacturing. Code to be provided by OEM

Unit ofMeasure

OEM LockiLEL parameters

Configurable: Theparameter can be changed
through the communication
protocol by users

Default Values

Customisable: Implementedby Honeywell (Nonconfigurable through thecommunication protocol)

TABLE 5. iLEL PARAMETERS

1 dayEN 50054

üWith the deadband enabled the sensor will read zero until theconcentration exceeds the deadband value. Is normally used
to prevent measurement oscillations. This function can be
configured to different limits
Incoming: As the reading decays down it will read zero once
it has fallen below the incoming threshold
Outgoing: As the reading increases it will read zero until it
exceeds the outgoing threshold
A bump test is a brief exposure of the sensor to the target
gas. The test has the objective of verifying that the sensor
responds and the instrument acts accordingly. The sensor
will tell the user when the bump interval has been exceeded

The compliance standard measurement can be changed
from EN 50054 to EN 60079-20-1

iLEL Series Gas Sensor Datasheet | sps.honeywell.com/ast | 3

INTELLIGENT SERIES GAS SENSORS (iSERIES)iLEL SERIESTABLE 6. INTRINSIC SAFETY

ApplicableStandards• UL 913, Intrinsically Safe Apparatus and AssociatedApparatus for Use in Class I, II, and III, Division 1, Hazardous(Classified) Locations, Eight Edition - Revision Date
2019/03/11• UL 508, Industrial Control Equipment Edition 18 - Revision
Date 2018/03/30. CSA C22.2 NO. 14, Industrial Control
Equipment Revision Date 2018/1/1• UL 60079-0, Electrical Apparatus for Explosive Atmospheres- Part 0: General Requirements, Seventh Edition - Issue Date
2019/03/26• UL 60079-1, Electrical Apparatus for Explosive Gas
Atmospheres – Part 1: Equipment Protection by Flameproof
Enclosures, Seventh Edition – Revision Date 2015/09/18• UL 60079-11, Electrical Apparatus for Explosive
Atmospheres - Part 11: Intrinsic Safety “ia”, Sixth Edition Revision Date 2018/09/14.
• CAN/CSA-C22.2 No. 157-92, Intrinsically Safe and Nonincendive Equipment for Use in Hazardous Locations Edition 3 - Revision Date 2003/06/01• CSA C22.2 NO. 60079-0 Explosive Atmospheres —Part 0: Equipment — General Requirements Edition 4 Issue Date 2019/02/01• CSA C22.2 NO. 60079-1:16 Electrical Apparatus forExplosive Gas Atmospheres – Part 1: Flameproof enclosures“d” – Edition 3 – Issue date 2016/05/01• CSA C22.2 NO. 60079-11:14 Explosive Atmospheres —Part 11: Equipment Protection By Intrinsic Safety “I”- Edition2 - Issue Date 2014/02/01• IEC 60079-0 Explosive atmospheres - Part 0: Equipment General requirements Edition 7 Revision Date 2017
• IEC 60079-1 Electrical Appartus for Explosive GasAtmospheres - Part 1: Flame-Proof Enclosures “D” Edition 7Issue Date 06/2014• IEC 60079-11 Explosive Atmospheres - Part 11: Equipment
Protection by Intrinsic Safety “I” Edition 6 Issue Date
06/2011• CENELEC EN IEC 60079-0 Explosive Atmospheres Part 0: Equipment - General Requirements Issue Date
07/22/2018• CENELEC EN 60079-1 Explosive Atmospheres Part 1: Equipment Protection by Flameproof Enclosures “D”
Issue Date 10/2014• CENELEC EN 60079-11 Explosive Atmospheres Part 11: Equipment Protection by Intrinsic Safety “I” Issue
Date 02/03/2012• CENELEC EN 50303 GROUP I, Category M1 Equipment
Intended to Remain Functional in Atmospheres Endangered
by Firedamp and/or Coal Dust Edition Issue Date 07/2000

iLEL Series Gas Sensor Datasheet | sps.honeywell.com/ast | 4

INTELLIGENT SERIES GAS SENSORS (iSERIES)iLEL SERIESTABLE 7. APPROVALS AND STANDARDSUL File Number

E 180262

Certificate Numbers

DEMKO 16 ATEX 1557U
IECEx ULD 16.0016U

ATEX Marking0518
ProtectionConcept Markings

IM1II1G

ATEX/IEC ExMarking

Ex da ia I Ma
Ex da ia IIC GaUL Marking

Division 1, Class I, Groups A, B, C, D
Class I, Zone 0, AEx da ia IIC

iLEL75X

Rated voltage: 3.2 V
Rated current: 90 mA
Rated power: 297 mW

iLEL75X

Intrinsically safe specifications
Ui = 5.88 V		
Ii = 1.1 A 			Pi = 1.2 W 			Li = 0 µH
Ci = 8.38 µF

Electrical dataiLEL Series Gas Sensor Datasheet | sps.honeywell.com/ast | 5WARRANTY/REMEDY
Honeywell warrants goods of its
manufacture as being free of defective
materials and faulty workmanshipduring the applicable warranty period.
Honeywell’s standard product warranty
applies unless agreed to otherwise by
Honeywell in writing; please refer to yourorder acknowledgment or consult yourlocal sales office for specific warranty
details. If warranted goods are returned
to Honeywell during the period ofcoverage, Honeywell will repair or replace,at its option, without charge those items
that Honeywell, in its sole discretion,finds defective. The foregoing is buyer’ssole remedy and is in lieu of all otherwarranties, expressed or implied,
including those of merchantability
and fitness for a particular purpose.
In no event shall Honeywell be liablefor consequential, special, or indirect
damages.
While Honeywell may provide application
assistance personally, through ourliterature and the Honeywell web site, it
is buyer’s sole responsibility to determine
the suitability of the product in theapplication.
Specifications may change without
notice. The information we supply isbelieved to be accurate and reliable as ofthis writing. However, Honeywell assumes
no responsibility for its use.

Honeywell
Advanced Sensing Technologies
830 East Arapaho Road
Richardson, TX 75081
sps.honeywell.com/ast

002707-3-EN | 3 | 11/21© 2021 Honeywell International Inc. All rights reserved.

m WARNINGMISUSE OF
DOCUMENTATION••

The information presented in thisproduct sheet is for reference only.
Do not use this document as a
product installation guide.
Complete installation, operation,and maintenance information
is provided in the instructions
supplied with each product.

Failure to comply with these
instructions could result in death orserious injury.

SAFETY NOTEThis sensor is designed to be used insafety-critical applications. To ensurethat the sensor and/or instrument inwhich it is used, are operating properly, it
is a requirement that the function of thedevice is confirmed by exposure to target
gas (bump check) before each use of thesensor and/or instrument. Failure to carryout such tests may jeopardize the safety ofpeople and property.

Under no circumstances should intelligent
sensor pads be soldered to, as this cancause problems. Connection should bemade via a mounting socket and spring
connector.

WARNING: SOLDERING TO
PADS WILL RENDER YOURWARRANTY VOID.