Gas Sensors
4 Series
City Tech’s 4-Series gas sensors are the industry standard for portable gas detectors. The range includes sensors which detect oxygen and toxic gases, carbon dioxide and hydrocarbons and fully certified pellistors for combustible gas detection
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Overview
Honeywell 4-Series gas sensors are the industry standard for use in portable gas detectors. The range includes sensors which detect oxygen, ammonia, hydrogen sulfide, carbon monoxide, chlorine, nitric oxide, and numerous toxic and fully certified pellistors for combustible gas detection.
The 4 Series features a large, robust sensor design and is durable to withstand environmental demands. In addition to portable devices, the comprehensive range of sensors is suitable for fixed safety and emissions applications.
Introducing the 4NH3LL-100
The 4 Series features a large, robust sensor design and is durable to withstand environmental demands. In addition to portable devices, the comprehensive range of sensors is suitable for fixed safety and emissions applications.
Introducing the 4NH3LL-100
- The Honeywell 4NH3LL-100 is a 3-electrode electrochemical sensor designed to detect ammonia (NH3) levels ranging from 0 ppm to 100 ppm.
- This long-life sensor is suitable for both portable and fixed gas detection in diverse applications, including farming, refrigeration systems, and various industrial sectors such as food, semiconductor, and chemical industries.
- Sensor can operate constantly with background levels of ammonia without affecting the sensor’s performance - ideal for livestock and poultry farming applications.
- The sensor operates effectively within a temperature range of -20°C to 40°C and a humidity level from 15% to 90% RH. (Could be operated intermittently from -40°C to 50°C)
- It has a lifespan of two years in fresh air and is backed by a 12-month warranty from the date of shipment.
- The sensor exhibits a sensitivity of 30 nA/ppm (±20 nA/ppm) and a response time of less than 90 seconds.
Specifications
Applications & Compatibility
- Application
- Drainage and Sewage Areas
- Fire Detection
- Food Processing
- Leakage Detection
- Manufacturing Factories
- Mining Processes
- Portable & Fixed Life Safety
- Refineries
- Residential
- TVL Monitoring (Threshold Value Level)
- Ventilation Control
- Recommended Load Resistor
- 10 Ohm
- 33 Ohm
- 5 Ohm
Overview
- Warranty
- 12 Months from Date of Dispatch
- 18 Months from Date of Dispatch
- Brand
- Honeywell
- Honeywell Citytech
Operating Characteristics
- Storage Temperature
- 0 to 20°C
- 10 to 30°C
Standards & Certifications
- Standards & Certifications
- AQ6205-2006
- ATEX
- EN 45544-2000
- EN/IEC 60079-0
- RoHS Compliant
- UL Certified - UL2075
- UL and CSA
Features
- Series Name
- 4
- 4CFC
- 4CM
- CiTiceL 4
- Operating Principle
- 2-Electrode Electrochemical
- 3-Electrode Electrochemical
- 4-Electrode Electrochemical
- Catalytic Oxidation
- Features & Benefits
- Anti-Poisoning in the Environment with Acrylonitrile Background
- Compact Size
- Designed for Breath Analysis
- Enhanced Long-Term Stability
- Extended Operating Range
- Factory Calibrated MV Output
- Fast Response and Recovery Time
- High Sensitivity for Better Resolution
- Higher Durability and Stability
- Ideal for Portable Life Safety Applications
- Improved Performance Variability
- Industry Leading Reliability
- Long Life
- Low Cros Sensitivity To Hydrogen
- Low Long-Term Output Drift
- Low Temperature and Humidity Effect
- On-Board Hydrogen and Temperature Compensation
- Robust 3-Series Packaging
- Stable Performance Six Sigma Output Performance
Electrical Specifications
- Maximum s/c Current
- < 1.0 A
Technical Specifications
- Gases Detected
- Acrylonitrile
- Carbon Monoxide (CO)
- Chlorine (CL)
- Ethylene Oxide (C2H4O)
- Hydrogen (H)
- Hydrogen Cyanide (HCN)
- Hydrogen Sulfide (H2S)
- Most Combustible Gases and Vapours
- Nitric Oxide (NO)
- Nitrogen Dioxide (NO2)
- Sulfur Dioxide (SO2)
- Calibration
- via Built-in Span and Zero Potentiometer
- Auxiliary Electrode
- To Compensate for Maximum 2,000 ppm H2 Cross Interference
Others
- Industry
- Aerospace
- Energy
Applications & Compatibility
- Application
- Drainage and Sewage Areas
- Fire Detection
- Food Processing
- Leakage Detection
- Manufacturing Factories
- Mining Processes
- Portable & Fixed Life Safety
- Refineries
- Residential
- TVL Monitoring (Threshold Value Level)
- Ventilation Control
- Recommended Load Resistor
- 10 Ohm
- 33 Ohm
- 5 Ohm
Overview
- Warranty
- 12 Months from Date of Dispatch
- 18 Months from Date of Dispatch
- Brand
- Honeywell
- Honeywell Citytech
Operating Characteristics
- Storage Temperature
- 0 to 20°C
- 10 to 30°C
Standards & Certifications
- Standards & Certifications
- AQ6205-2006
- ATEX
- EN 45544-2000
- EN/IEC 60079-0
- RoHS Compliant
- UL Certified - UL2075
- UL and CSA
Features
- Series Name
- 4
- 4CFC
- 4CM
- CiTiceL 4
- Operating Principle
- 2-Electrode Electrochemical
- 3-Electrode Electrochemical
- 4-Electrode Electrochemical
- Catalytic Oxidation
- Features & Benefits
- Anti-Poisoning in the Environment with Acrylonitrile Background
- Compact Size
- Designed for Breath Analysis
- Enhanced Long-Term Stability
- Extended Operating Range
- Factory Calibrated MV Output
- Fast Response and Recovery Time
- High Sensitivity for Better Resolution
- Higher Durability and Stability
- Ideal for Portable Life Safety Applications
- Improved Performance Variability
- Industry Leading Reliability
- Long Life
- Low Cros Sensitivity To Hydrogen
- Low Long-Term Output Drift
- Low Temperature and Humidity Effect
- On-Board Hydrogen and Temperature Compensation
- Robust 3-Series Packaging
- Stable Performance Six Sigma Output Performance
Electrical Specifications
- Maximum s/c Current
- < 1.0 A
Technical Specifications
- Gases Detected
- Acrylonitrile
- Carbon Monoxide (CO)
- Chlorine (CL)
- Ethylene Oxide (C2H4O)
- Hydrogen (H)
- Hydrogen Cyanide (HCN)
- Hydrogen Sulfide (H2S)
- Most Combustible Gases and Vapours
- Nitric Oxide (NO)
- Nitrogen Dioxide (NO2)
- Sulfur Dioxide (SO2)
- Calibration
- via Built-in Span and Zero Potentiometer
- Auxiliary Electrode
- To Compensate for Maximum 2,000 ppm H2 Cross Interference
Others
- Industry
- Aerospace
- Energy
- Application : Drainage and Sewage Areas|Fire Detection|Food Processing|Leakage Detection|Manufacturing Factories|Mining Processes|Portable & Fixed Life Safety|Refineries|Residential|TVL Monitoring (Threshold Value Level)|Ventilation Control
- Warranty : 12 Months from Date of Dispatch|18 Months from Date of Dispatch
- Storage Temperature : 0 to 20°C|10 to 30°C
- Standards & Certifications : AQ6205-2006|ATEX|EN 45544-2000|EN/IEC 60079-0|RoHS Compliant|UL Certified - UL2075|UL and CSA
- Series Name : 4|4CFC|4CM|CiTiceL 4
- Recommended Load Resistor : 10 Ohm|33 Ohm|5 Ohm
- Operating Principle : 2-Electrode Electrochemical|3-Electrode Electrochemical|4-Electrode Electrochemical|Catalytic Oxidation
- Maximum s/c Current : < 1.0 A
- Industry : Aerospace|Energy
- Gases Detected : Acrylonitrile|Carbon Monoxide (CO)|Chlorine (CL)|Ethylene Oxide (C2H4O)|Hydrogen (H)|Hydrogen Cyanide (HCN)|Hydrogen Sulfide (H2S)|Most Combustible Gases and Vapours|Nitric Oxide (NO)|Nitrogen Dioxide (NO2)|Sulfur Dioxide (SO2)
- Features & Benefits : Anti-Poisoning in the Environment with Acrylonitrile Background|Compact Size|Designed for Breath Analysis|Enhanced Long-Term Stability|Extended Operating Range|Factory Calibrated MV Output|Fast Response and Recovery Time|High Sensitivity for Better Resolution|Higher Durability and Stability|Ideal for Portable Life Safety Applications|Improved Performance Variability|Industry Leading Reliability|Long Life|Low Cros Sensitivity To Hydrogen|Low Long-Term Output Drift|Low Temperature and Humidity Effect|On-Board Hydrogen and Temperature Compensation|Robust 3-Series Packaging|Stable Performance Six Sigma Output Performance
- Calibration : via Built-in Span and Zero Potentiometer
- Brand : Honeywell|Honeywell Citytech
- Auxiliary Electrode : To Compensate for Maximum 2,000 ppm H2 Cross Interference
Data Sheet
Name
Description
File Size
Date
Size
CiTiceL 4CFC Carbon Monoxide (CO) Gas Sensor
application/pdf 330.73 KB
8/12/2025
330.73 KB
SURECELL™ H2S(H) Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 314.75 KB
8/11/2025
314.75 KB
SURECELL™ 4HS GAS SENSOR - Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 319.8 KB
8/11/2025
319.8 KB
SURECELL™ H2S(L) Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 322.64 KB
8/11/2025
322.64 KB
4-H2S 1000 Classic Line Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 383.82 KB
8/12/2025
383.82 KB
ECO-SURE X Carbon Monoxide (CO) Sensor
application/pdf 337.78 KB
8/12/2025
337.78 KB
CiTiceL 4OXV Oxygen (O2) Sensor
application/pdf 317.67 KB
8/12/2025
317.67 KB
Citytech 5OXLL (Emissions) sensor Datasheet
application/pdf 1.27 MB
7/15/2021
1.27 MB
CiTipeL 4P75M Combustible Gas Sensor
application/pdf 495.47 KB
8/12/2025
495.47 KB
CiTipeL 4P75 Combustible Gas Sensor Data Sheet
application/pdf 546.82 KB
8/12/2025
546.82 KB
CiTipeL 4P90M Combustible Gas Sensor
application/pdf 495.26 KB
8/12/2025
495.26 KB
CiTipeL 4P50 Combustible Gas Sensor
application/pdf 570.21 KB
8/12/2025
570.21 KB
CiTipeL 4P75C Combustible Gas Sensor
application/pdf 536.85 KB
8/12/2025
536.85 KB
CiTipeL 4P50M Combustible Gas Sensor
application/pdf 495.12 KB
8/12/2025
495.12 KB
CiTipeL 4P90 Combustible Gas Sensor
application/pdf 522.54 KB
8/12/2025
522.54 KB
Citytech 4OXLL industrial sensor Datasheet
application/pdf 246.79 KB
8/12/2025
246.79 KB
CiTipeL 4P50C Combustible Gas Sensor
application/pdf 533.05 KB
8/19/2021
533.05 KB
CiTipeL 4P90C Combustible Gas Sensor
application/pdf 534.02 KB
8/12/2025
534.02 KB
CiTiceL 4HS/LM Hydrogen Sulfide (H2S) Sensor
application/pdf 93.75 KB
8/12/2025
93.75 KB
CiTiceL 4HS+ Hydrogen Sulfide (H2S) Sensor
application/pdf 352.73 KB
8/11/2025
352.73 KB
CiTipeL 4P75C T4 Combustible Gas Sensor
application/pdf 463.99 KB
8/19/2021
463.99 KB
Brochure
Name
Description
File Size
Date
Size
Controlling the Future with Technology
application/pdf 11.81 MB
8/11/2025
11.81 MB
Detecting the Third Element, Honeywell Gas Sensing
application/pdf 4.87 MB
8/12/2025
4.87 MB
Brochure about Honeywell's Sensor & Switch Solutions for HVAC.
application/pdf 11.68 MB
8/7/2025
11.68 MB
Brochure about Sensor & Switch solutions for HVAC
application/pdf 11.68 MB
7/23/2025
11.68 MB
Sensing Solutions For Industrial Applications
application/pdf 16.68 MB
8/11/2025
16.68 MB
Application Note
Name
Description
File Size
Date
Size
Solutions For Healthier Air & HVAC Systems
application/pdf 3.88 MB
8/12/2025
3.88 MB
4NH3LL-100 Long Life Sensor for Ammonia Detection App Note
application/pdf 3.27 MB
2/28/2025
3.27 MB
Switches and Sensors Solutions for Industrial Applications -
application/pdf 2.48 MB
8/11/2025
2.48 MB
Others
Name
Description
File Size
Date
Size
A Breakthrough In Ammonia Sensing Flyer
application/pdf 871.17 KB
4/1/2025
871.17 KB
Name
Description
File Size
Date
Size
CiTiceL 4CFC Carbon Monoxide (CO) Gas Sensor
application/pdf 330.73 KB
8/12/2025
330.73 KB
SURECELL™ H2S(H) Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 314.75 KB
8/11/2025
314.75 KB
SURECELL™ 4HS GAS SENSOR - Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 319.8 KB
8/11/2025
319.8 KB
SURECELL™ H2S(L) Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 322.64 KB
8/11/2025
322.64 KB
4-H2S 1000 Classic Line Hydrogen Sulfide (H2S) Gas Sensor
application/pdf 383.82 KB
8/12/2025
383.82 KB
Controlling the Future with Technology
application/pdf 11.81 MB
8/11/2025
11.81 MB
Solutions For Healthier Air & HVAC Systems
application/pdf 3.88 MB
8/12/2025
3.88 MB
Detecting the Third Element, Honeywell Gas Sensing
application/pdf 4.87 MB
8/12/2025
4.87 MB
Brochure about Honeywell's Sensor & Switch Solutions for HVAC.
application/pdf 11.68 MB
8/7/2025
11.68 MB
Brochure about Sensor & Switch solutions for HVAC
application/pdf 11.68 MB
7/23/2025
11.68 MB
A Breakthrough In Ammonia Sensing Flyer
application/pdf 871.17 KB
4/1/2025
871.17 KB
4NH3LL-100 Long Life Sensor for Ammonia Detection App Note
application/pdf 3.27 MB
2/28/2025
3.27 MB
Sensing Solutions For Industrial Applications
application/pdf 16.68 MB
8/11/2025
16.68 MB
Switches and Sensors Solutions for Industrial Applications -
application/pdf 2.48 MB
8/11/2025
2.48 MB
ECO-SURE X Carbon Monoxide (CO) Sensor
application/pdf 337.78 KB
8/12/2025
337.78 KB
CiTiceL 4OXV Oxygen (O2) Sensor
application/pdf 317.67 KB
8/12/2025
317.67 KB
Citytech 5OXLL (Emissions) sensor Datasheet
application/pdf 1.27 MB
7/15/2021
1.27 MB
CiTipeL 4P75M Combustible Gas Sensor
application/pdf 495.47 KB
8/12/2025
495.47 KB
CiTipeL 4P75 Combustible Gas Sensor Data Sheet
application/pdf 546.82 KB
8/12/2025
546.82 KB
CiTipeL 4P90M Combustible Gas Sensor
application/pdf 495.26 KB
8/12/2025
495.26 KB
CiTipeL 4P50 Combustible Gas Sensor
application/pdf 570.21 KB
8/12/2025
570.21 KB
CiTipeL 4P75C Combustible Gas Sensor
application/pdf 536.85 KB
8/12/2025
536.85 KB
CiTipeL 4P50M Combustible Gas Sensor
application/pdf 495.12 KB
8/12/2025
495.12 KB
CiTipeL 4P90 Combustible Gas Sensor
application/pdf 522.54 KB
8/12/2025
522.54 KB
Citytech 4OXLL industrial sensor Datasheet
application/pdf 246.79 KB
8/12/2025
246.79 KB
CiTipeL 4P50C Combustible Gas Sensor
application/pdf 533.05 KB
8/19/2021
533.05 KB
CiTipeL 4P90C Combustible Gas Sensor
application/pdf 534.02 KB
8/12/2025
534.02 KB
CiTiceL 4HS/LM Hydrogen Sulfide (H2S) Sensor
application/pdf 93.75 KB
8/12/2025
93.75 KB
CiTiceL 4HS+ Hydrogen Sulfide (H2S) Sensor
application/pdf 352.73 KB
8/11/2025
352.73 KB
CiTipeL 4P75C T4 Combustible Gas Sensor
application/pdf 463.99 KB
8/19/2021
463.99 KB
Name
Date
Size
3/3/2025
8/12/2025
8/12/2025
7/15/2021
8/12/2025
8/12/2025
8/12/2025
8/12/2025
8/12/2025
8/12/2025
8/12/2025
8/19/2021
8/12/2025
8/19/2021
8/11/2025
8/7/2025
7/23/2025
3/3/2025
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Description
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2112B2003
SURECELL CO(M)
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2003
SURECELL CO(M)
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2003R
Carbon Monoxide CO 4-series Replacement Sensor CO(M) (0-1000ppm) Surecell
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2003R
Carbon Monoxide CO 4-series Replacement Sensor CO(M) (0-1000ppm) Surecell
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2004
SURECELL CO(H)
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2004
SURECELL CO(H)
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2005
Carbon Monoxide CO 4-series Sensor 4CF+ (0-500ppm) CiTiceL
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2005
Carbon Monoxide CO 4-series Sensor 4CF+ (0-500ppm) CiTiceL
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2005R
4CF+ CO SENSOR IN POT
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2005R
4CF+ CO SENSOR IN POT
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2006
Carbon Monoxide CO 4-series Sensor 4CFC (0-1000ppm) CiTiceL
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2006
Carbon Monoxide CO 4-series Sensor 4CFC (0-1000ppm) CiTiceL
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2006R
CO 4CFC 1,000PPM 4SERIES SENSOR REP.
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2006R
CO 4CFC 1,000PPM 4SERIES SENSOR REP.
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2007
CO 4CF+ 500PPM 4SERIES SENSOR
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2007
CO 4CF+ 500PPM 4SERIES SENSOR
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2007R
4CF+ GLOBAL + POT
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2007R
4CF+ GLOBAL + POT
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2015
Sulfur Dioxide SO2 4-series Sensor 4S (0-20ppm) CiTiceL
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
2112B2015
Sulfur Dioxide SO2 4-series Sensor 4S (0-20ppm) CiTiceL
https://s7d1.scene7.com/is/image/Honeywell65/sps-siot-citytech-4-series
