iH2SGAS SENSOR

002706

Issue 3

Hydrogen Sulfide (H2S) Intelligent Series Gas Sensor (iseries)
DOCUMENT PURPOSE
The purpose of this document is topresent the performance specification ofthe intelligent iH2S hydrogen sulfide gas
sensor. This document should be usedin conjunction with the Product Safety
Datasheet (PSDS 5). For guidance on thesafe use of the sensor, please refer to theCommunication Protocol (SDCS) andSensor 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)

Hydrogen Sulfide (H2S)
Sensor: iH2SPart Number: AC400-R00D-CIT

FEATURES AND BENEFITSUARTDigital interface –The sensor has a
UART protocol tocommunicate with
the instrument withchip select option
as described in theCommunication
Protocol (SDCS)

Interchangeable –All intelligent
sensors have thesame dimensions
and communication
protocol. All sensors
in the range will workwith a supply voltage
from 3.1 V to 3.3 V

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

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

OEM lock – Sensors have two levelsof lock codes. The first one is an OEM
specific code programmed in during
manufacture and cannot be modified.
This lock code is provided by the OEM.
Instrument can check if the sensor has theunique code – if not the instrument canrefuse the sensor. The second level of lockcode is left blank and can be updated by
OEM/Partners during sensor integration
into the instrument as needed

Predictive
calibration – The
recalibration alarm
will be triggered when
the countdown timer
is reachedEnd-of-life
indication – The
alarm will be flagged
when the sensor
has taken/lost a
considerable amountof water (electrolyte
concentration isabove or below limits)

Fault indication –Intelligent sensors
can detect
several internalfaults like drift/fault in referenceelectrode, electrolyte
concentration outof range, counterelectrode fault;
therefore notifying
the user to takecorrective actions

Compact form
factorDesigned to meet global performancestandards

Five-year life

ATEX and IEC Ex Certified per
EN IEC 60079-0 and EN IEC 60079-11

RoHS compliant

Designed to meet performancestandards: BS EN 45544-1,
AS/NZS 4641 and ANSI/ISA 92.00.01

INTELLIGENT SERIES GAS SENSORS (iSERIES)
iH2S SERIES
Product Dimensions

Target Gas

H2SRange

0 ppm to 200 ppm

Accuracy±5 % of measuring value

T90* Response Time

<30 seconds, typ.

T50* Response Time

<15 seconds<30 seconds across temperature range

Outputppm compensated for temperature

0.1 ppm

Baseline Offset*<±0.5 ppm H2S equivalent

Equilibrium Baseline
Shift from -40°C to60°C<±3 ppm

Repeatability*±5% of measured value

Orientation Sensitivity

None

Serial Comunication

UART with Chip Select

ENVIRONMENTAL

Operating Temperature
Range-40°C to 60°C

Operating Humidity
Range

5 % RH to 95 % RH (non-condensing)Operating Pressure
Range

600 mbar to 1200 mbarRecommended Storage
Temperature

0°C to 20°C

Flow Rate

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

LIFETIME<10% signal life per annum

Expected Operating Life 5 years in air
PHYSICAL CHARACTERISTICS(10,3)(incl. top cover)1 sample per second (1 Hz)

Resolution‡ (O-ring)‡ For mounting and sealingaround sensor, refer to theSensor Mounting Application
Note.

7,00 ±0,1010,82,0 typ.

5,4+VCS-VeRx

Tx

3,6 3,6Ø 2,00
Shorting pads
3 posn.

3,5 3,5Linear (±5 % from linear, up to 200 ppm)

Measurement Interval

3,00 +0,10/-0,15

Linearity*

45°

1,0 typ.

Recovery Time<180 seconds
from 200 ppm to <4 ppm

Long-Term Output
Drift*

21000 ppm

7,75

concentration that can be reached
before damaging the sensor)

14,2Overload (maximum

Do notobscure(19,76)

Electrochemical

Ø17,00Operating Principle

20,0 (includes label)

20,0 (includes label)
10,0 ±0,2

10,0 ±0,2

MEASUREMENT

1,87,00

TABLE 1. TECHNICAL SPECIFICATIONSAll dimensions in mm
Do not connect tounlabeled pins.

6,75TABLE 2. ELECTRICAL SPECIFICATIONS
Min.

Max.

Typ.

Unit

Supply Voltage (Vdd)

33.6

3.3

Vdc

Voltage of any pin relative toground

03.6–Vdc

Peak supply current (typ. volt)
Current: at stand-by mode
Current: at active mode
Average power consumption

25––mA
15.49

mA

––

26.67

mA

0.046

900.088mW

Weight<6 gContact Material

Gold plated

O-Ring Material

FKM60 ±5 shore A

Outer Plastic Body
Material

Modified PPO

PinDescription* 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.

+V

Positive power supply-V
Rx

GroundData transmitted from instrument to sensor

Tx

Data transmitted from sensor to instrument

CS
Other Pads

Chip SelectDo not connect, shorting link contacts only

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

TABLE 3. PINOUTNOTE: H2S cells are shipped with a shorting clip which must be removed prior toinstallation.

iH2S Series Gas Sensor Datasheet | sps.honeywell.com/ast | 2

INTELLIGENT SERIES GAS SENSORS (iSERIES)
iH2S SERIESOEM code(First level)

Password iscustomisable.* (NoLock
will be set by default incase the OEM lock is
not required)No more than 6 characters(ASCII format)

Partner code
(Second level)–

No more than 6 characters(ASCII format)

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

Calibration
Alarms
Predictive
Calibration
End ofLife
DeadbandBump
Due Days

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

Configurable: The
parameter can be changed
through the communication
protocol by users

Configurable Range

Customisable:

Default Values

User Factor

OEM LockiH2S parameters

Implemented by Honeywell(Non-configurable throughthe communication protocol)

TABLE 4. iH2S PARAMETERS* OEM code will be set by Honeywell during sensor
manufacturing. Code to be provided by OEMüü*ü

Once this code has been set by user, it is not possible tochange itü*** 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 the selectablelist

Zero (clean air)0 ppmûSpan (target gas)

20 ppmüLow

10 ppmHigh20 ppm

Limit LOW lower: 0.5
Limit LOW upper: 100
Limit HIGH lower: 0.5
Limit HIGH upper: 100

Notes

Calibration is performed at two points throughout theoperating range of the sensor. The calibration points aredefined 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 protocolüüShort-Term Exposure Limit: STEL is a limit value above
which exposure to a chemical substance should not occur. It15 ppm
Limit STEL lower: 0.5
usually references a 15-minute period. STEL works to prevent
STELü
over 15 minutes
Limit STEL upper: 100
adverse health effects along with other unwanted effects due
to peak exposure that could possibly not be controlled by theapplication of an 8 hour TWA limit
Time-Weighted Average: TWA for chemical exposure can beused when each of the chemical concentration and time forexposure varies over time. It conveys the average exposure
Limit TWA lower: 0.5
TWA
10 ppm over 8 hours
to a contaminant to which workers may be exposed withoutüLimit TWA upper: 100
adverse effect over a period of time such as an 8-hour day or
40-hour week (an average work shift). The measurement isexpressed in units of ppm
The recalibration alarm will be triggered when either the countdown or the accuracy threshold are reached (whichever is triggered first).
Countdown timer
The alarm will be flagged when the countdown reaches 0. The
180 daysü(Cal due days)
countdown restarts when the sensor is calibrated
The predictive calibration estimation will depend on theaccuracy of the sensor (this parameter can be configured byAccuracy±20%±10% to ±50%
the user). The tighter the accuracy value, the more frequentüthresholdcalibration needed. The sensor will request a recalibration when
the default accuracy(±20% of measuring value) is reachedThe EoL alarm will be triggered when either the countdown or the future prediction algorithm conditions are met
Future prediction
The algorithm triggers an alarm when the sensitivity < 50% ofûalgorithm
original sensitivity at minimum recent temperature
Countdown timer
1825 days
The countdown timer is set for 1825 days, i.e. 5 yearsû
With the deadband enabled the sensor will read zero until theconcentration exceeds the deadband value. Is normally usedü
Active by defaultü
to prevent measurement oscillations. This function can be
configured to different limits
Incoming: As the reading decays down it will read zero once it
Incoming
0.1 ppm
Whole measurement range
ü
has fallen below the incoming threshold
Outgoing: As the reading increases it will read zero until it
Outgoing
0.2 ppm
Incoming < Outgoingü
exceeds the outgoing threshold
1 dayü

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 willtell the user when the bump interval has been exceeded.

iH2S Series Gas Sensor Datasheet | sps.honeywell.com/ast | 3

INTELLIGENT SERIES GAS SENSORS (iSERIES)
iH2S SERIESTABLE 5. INTRINSIC SAFETY CERTIFICATIONSIntrinsic Safety
Entity Parameters

Ui = 5.88 V, Ii = 1.1 A, Pi = 1.2 W, Ci = 13.14 uF, Li = 0 uHIntrinsic Safety
Rating

IIC T4, ia, 60°C

ATEX Marking

I M1II 1G
Ex ia I Ma
Ex ia IIC Ga

Poisoning
Gas sensors are designed for operation in a wide range of environments and harshconditions. However, it is important that exposure to high concentrations of solvent
vapours is avoided, both during storage, fitting into instruments, and operation. Whenusing sensors with printed circuit boards (PCBs), degreasing agents should be used
before the sensor is fitted.
Do not glue directly on or near the sensor as the solvent may cause crazing of theplastic.

iH2S Series Gas Sensor Datasheet | sps.honeywell.com/ast | 4

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 returnedto 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 withoutnotice. 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

002706-3-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 leakage of electrolyte. Connection
should be made via a mounting socket andspring connector.

WARNING: SOLDERING TO
PADS WILL RENDER YOURWARRANTY VOID.