Electrochemical Sensors for Hazardous Gas Detection

SemeaTech, a world leader in sensing technologies, offers a full line of electrochemical sensors for detecting hazardous materials and gases for work safety and environmental protection.

SemeaTech has built a wide network of industry experts and technologists to provide the company with guidance for customer needs and market requirements in order to release the right products featuring minimized environmental impact, no application errors, higher resolutions, increased sensitivity, improved stability, better exchangeability, wider measuring ranges, etc.

It is recommended that you mount the SemeaTech electrochemical sensors in a Socket where they can be removed and replaced when their working life expires (electrolyte is used up).

4 Series Electrochemical Gas Sensor

4 Series Low Explosion Level (LEL) Combustible Gas Sensors (Catalytic)

7 Series Electrochemical Sensors

7 Series Smart Gas Sensor Module

Gas Sensor Calibrators for the 4 and 7 Series Gas Sensors

Air Quality Monitoring

PID (Photoionization Detection) Sensors and PID Lamps for VOCs 

Stack Emission Monitoring Electrochemical Sensors

Commercial Low Cost CO Sensor

Sensor Module PCB

 

4 Series Electrochemical Gas Sensors

SizeProductGasRangeResolutionResponsePart No.
4 Series4AsH3AsH3
Arsine		0 – 1 ppm20 ppb≤60s 078-0000-000
4SM B2H6B2H6
Boron Hydride		0 - 1ppm0.01 ppm≤60s 084-6000-000
4CO-50CO
Carbon Monoxide		0-50 ppm0.15 ppm≤30s051-1200-000
4CO-1000-100 ppm0.15 ppm≤30s051-1100-000
4CO-5000-500 ppm1 ppm≤15s051-0000-000
4CO-500S0-500 ppm1 ppm≤20s
4CO-10000-1000 ppm1 ppm≤15s051-0500-000
4CO-20000-2000 ppm10 ppm≤30s051-0100-000
4CO-50000-5000 ppm10 ppm≤30s051-0900-000
4CO-100000-10,000 ppm10 ppm≤30s051-0800-000
4CO-200000-20,000 ppm10 ppm≤30s051-1000-000
4C2H2-10C2H2
Acetylene		0-10 ppm0.5 ppm≤70s075-0100-000
4C2H2-1000-100 ppm1 ppm≤75s075-0000-000
4C2H2-2000-200 ppm1 ppm≤90s075-0200-000
4C2H4-10C2H4
Ethylene / Ethene		0-10 ppm0.5 ppm≤90s076-0100-000
4C2H4-1000-100 ppm0.8 ppm≤90s076-0200-000
4C2H4-2000-200 ppm1 ppm≤90s076-0000-000
4CH2H3CL-20C2H3CL
Vinyl Chloride		0-20ppm067-0200-000
4C2H3CL-1000-100 ppm067-0000-000
4CH2O-10CH2O
Formaldehyde		0-10 ppm072-0000-000
4CH2O-500-50 ppm072-0100-000
4ETO-10C2H4O
(ETO) Ethanol, etc.		0-10 ppm0.1 ppm≤120s055-0000-000
4ETO-1000-100 ppm1 ppm≤120s055-0100-000
4ETO-5000-500 ppm10 ppm≤120s055-0200-000
4CH3SH-10CH3SH
Methanethiol		0-10 ppm065-0000-000
4CL2-10CL2
Chlorine		0-10 ppm062-0100-000
4CL2-500-50 ppm061-0400-000
4CL2-2000-200 ppm061-000-000
4HCL-20HCL
Hydrogen Chloride		0-20ppm0.5ppm≤70s063-0500-000
4HCL-500-50ppm0.3ppm≤70s063-0000-000
4HCL-1000-100ppm0.2ppm≤70s063-0600-000
4HCL-2000-200ppm0.08ppm≤60s063-0200-000
4HCL-20HCL
Hydrogen Chloride
No Bias		0-20 ppm0.2 ppm≤105s063-1000-000
4HCL-50No Bias0-50 ppm0.2 ppm≤105s063-1100-000
4CLO2-1ClO2
Chlorine Dioxide		0-1 ppm061-0100-000
4CLO2-100-10 ppm061-0400-000
4CLO2-500-50 ppm061-0000-000
4H2-1000H2
Hydrogen		0-1000 ppm10 ppm≤70s054-0000-000
4H2-20000-2000 ppm≤70s054-0400-000
4H2-400000-40000 ppm80 ppm≤70s054-0100-000
4HCN-50SHCN
Hydrogen Cyanide		0-50 ppm<=200 ppb<95s064-1000-000
4HCN-10S0-10 ppm<=200 ppb<95s064-1100-000
4HF-10HF
Hydrogen Fluoride		0-10 ppm069-0000-000
4HF-1000-100 ppm069-0100-000
4N2H4-1Hydrazine0-1 ppm0.2 ppm≤120s082-0000-000
4H2S-50H2S
Hydrogen Sulfide		0-50 ppm0.1 ppm≤25s052-0400-000
4H2S-1000-100 ppm0.1 ppm≤30s052-0000-000
4H2S-5000-500 ppm0.1 ppm≤45s052-1500-000
4H2S-10000-1000 ppm1 ppm≤45s052-0100-000
4H2S-20000-2000 ppm1 ppm≤45s052-0600-000
4H2S-50000-5000 ppm1 ppm≤45s052-0700-000
4H2S--100HTH2S High Temp &
Extreme Humidity		0-100 ppm
4NH3-20NH3
Ammonia		0-20 ppm(0 Bias)059-0900-000
4NH3-100S0-100 ppm(0 Bias)≤40s059-1900-000
4NH3-500S0-500 ppm(0 Bias)≤40s059-2100-000
4NH3-1000S0-1000 ppm(0 Bias)≤40s059-2200-000
4NH3-20000-2000 ppm(0 Bias)059-0600-000
4NH3-100LNH3
(Long Life)
Ammonia		0-100 ppm(0 Bias)059-1200-000
4NH3-500L0-500 ppm(0 Bias)059-1100-000
4NH3-1000L0-1000 ppm(0 Bias)059-1300-000
4NH3-2000L0-2000 ppm(0 Bias)059-1400-000
4NH3-5000L0-5000 ppm(0 Bias)059-1500-000
4NO-5NO
Nitrous Oxide		0-5 ppm058-0300-000
4NO-2500-250 ppm058-0000-000
4NO-20000-2000 ppm058-0100-000
4NO2-5NO2
Nitrogen Dioxide		0-5 ppm057-0300-000
4NO2-200-20 ppm0.1 ppm≤30s057-0000-000
4NO2-20000-2000 ppm5 ppm≤60s057-0100-000
4O2-LFO2
Oxygen		0-30%0.1%≤20s053-0000-000
4O2-LF-M0-30%0.05%≤15s053-0200-000
4O3-1O3
Ozone		0-1 ppm068-0400-000
4O3-100-10 ppm068-0000-000
4O3-1000-100 ppm068-0100-000
403-10000-1000 ppm
4PH3-20PH3
Phosphine		0-20 ppm060-0000-000
4PH3-10000-1000 ppm060-0100-000
4PH3-20000-2000 ppm060-0400-000
4SO2-5SO2
Sulphur Dioxide		0-5 ppm056-0400-000
4SO2-200-20 ppm0.1 ppm≤45s056-0000-000
4SO2-20B*No sensitivity loss over time due to humidity0-20 ppm0.02 ppm≤60s056-1000-000
4SO2-20BF*No cross-sensitivity to H2S
*No sensitivity loss over time due to humidity		0-20 ppm0.02 ppm≤90s056-0900-000
4SO2-1000-100 ppm056-0500-000
4SO2-20000-2000 ppm≤45s056-0100-000

4 Series Low Explosion Level (LEL) Combustible Gas Sensors
(Catalytic)

SizeProductGasRangeResolutionResponsePart No.
4 Series4LEL-D-2.5/3.0Combustible Gas090-DX00-000
4LEL-H-2.0Combustible Gas090-H000-000
Application Notes:

4 Series NDIR (Non Dispersive InfraRed) Sensors

NDIR gas sensors are Highly Sensitive and can detect even trace amounts of gas in the environment. They can measure gases in parts per million (ppm).

NDIR sensors are Highly Specific (Specificity) to the gas they are designed to detect. They operate based on the principle that different gases absorb infrared radiation at specific wavelengths. This specificity ensures accurate and reliable gas detection without interference from other gases present in the environment.

These 4 Series Dual Channel NDIR Sensors have a microprocessor with embedded intelligent software, which handles signal acquisition, processing, and output. The NDIR sensor simultaneously performs environmental temperature compensation, corrects response non-linearity and offers multiple output options.

SizeProductGasRangeResolutionResponsePart No.
4 Series4CO2-5000CO2
Carbon Dioxide		0-5000ppm1%≤30s096-0100-000

7 Series Electrochemical Sensors

SizeProductGasRangeResolutionResponsePart No.
7 Series7CO-50CO
Carbon Monoxide		0-50 ppm 0.5 ppm≤30s051-1300-000
7CO-10000-1000 ppm0.5 ppm≤30s051-0200-000
7CO-20000-2000 ppm0.5 ppm≤30s051-0600-000
7CO-100000-10,000 ppm5 ppm≤30s051-0700-000
7C2H3CL-50C2H3Cl
Vinyl Chloride		0-50 ppm1 ppm≤120s067-0300-000
7C2H3CL-1000-100 ppm≤120s067-0100-000
7CH2O-10CH2O
Formaldehyde		0-10 ppm072-0200-000
7CH2O-500-50 ppm072-0300-000
7ETO-20C2H4O
(ETO) Ethanol, etc.		0-20 ppm0.1 ppm≤120s055-0400-000
7ETO-1000-100 ppm1 ppm≤120s055-0300-000
7CH3SH-10CH3SH
Methanethiol		0-10 ppm0.1 ppm≤60s065-0100-000
7CL2-20 Cl2
Chlorine		0-20 ppm0.1 ppm≤30s062-0300-000
7CL2-500-50 ppm≤30s062-0400-000
7CLO2-1ClO2
Chlorine Dioxide		0-1 ppm061-0200-000
7CLO2-200-20 ppm0.1 ppm≤60s061-0300-000
7H2-1000H2
Hydrogen		0-100 ppm054-0200-000
7H2-100000-10000 ppm0.03 ppm≤100s054-0300-000
7H2-200000-20000 ppm054-0500-000
7HCL-20HCl
Hydrogen Chloride		0-20 ppm063-0400-000
7HCL-50 0-50 ppm1 ppm≤70s063-0100-000
7HCL-1000-100 ppm063-0300-000
7HCL-50HCL
Hydrogen Chloride
No Bias		0-50 ppm0.2 ppm≤105s063-1200-000
7HCN-50HCN
Hydrogen Cianide		0-50 ppm0.2 ppm≤120s064-0100-000
7HF-10HF
Hydrogen Floride		0-10 ppm0.5 ppm≤120s069-0300-000
7HF-500-50 ppm0.5 ppm≤120s069-0200-000
7H2S-50H2S
Hydrogen Sulfide		0-50 ppm0.1 ppm≤30s052-0300-000
7H2S-1000-100 ppm0.25 ppm≤30s052-0500-000
7H2S-2000-200 ppm≤30s052-0200-000
7H2S-5000-500 ppm≤30s052-1300-000
7H2S-10000-1000 ppm≤30s052-0800-000
7H2S-20000-2000 ppm≤30s052-0900-000
7H2S-50000-5000 ppm≤30s052-1100-000
7H2S-100000-10000 ppm≤30s052-1400-000
7NH3-100SNH3
Ammonia		0-100 ppm0.1 ppm≤40s059-2300-000
7NH3-200S0-200 ppm≤60s059-2800-000
7NH3-500S0-500 ppm2 ppm≤40s059-2400-000
7NH3-1000S0-1000 ppm≤40s059-2500-000
7NH3-2000S0-2000 ppm5 ppm≤90s059-1000-000
7NH3-100LNH3
Ammonia
Long Life		0-1001 ppm≤90s059-1600-000
7NH3-200L059-2700-000
7NH3-500L0-5002 ppm≤90s059-1700-000
7NH3-1000L059-3200-000
7NO-100NO
Nitrogen Oxide		0-100 ppm1 ppm≤60s058-0200-000
7NO2-5NO2
Nitrogen Dioxide		0-5 ppm25 ppb≤30s057-0400-000
7NO2-200-20 ppm0.1 ppm≤30s057-0200-000
7NO2-1000-100 ppm0.5 ppm≤120s057-0500-000
7NO2-5000-500 ppm
7O3-1O3
Ozone		0~1 ppm0.02 ppm≤45s068-0300-000
7O3-200-20 ppm≤45s068-0200-000
703-1000-100 ppm0.5 ppm≤45s068-0500-000
7PH3-5PH3
Phosphine		0-5 ppm060-0300-000
7PH3-20000-2000 ppm1 ppm≤60s060-0200-000
7SO2-5SO2
Sulfer Dioxide		0-5 ppm0.2 ppm≤45s056-0600-000
7SO2-200-20 ppm0.1 ppm≤45s056-0200-000
7SO2-20000-2000 ppm5 ppm≤60s056-0300-000

7 Series Smart Gas Sensor Module

Electro Optical Components, Inc. introduces the 7ECM-SMART Sensor Module combining a 7-Series electrochemical sensor (EC), a PCB assembly and a metal closure. It integrates the entire gas detection process of signal acquisition, amplification, filtration, data conversion, temperature compensation, etc. all in one. It is easy to use and tremendously improves the user experience in gas detection applications.

Gas Sensor Calibrators for the 4 and 7 Series Gas Sensors

The SemeaTech Gas Sensor Calibrators are designed for calibration and bump test of the 4 and 7 series gas detectors or sensors. It can be used in the laboratory and is also convenient to be used in the field. This device consists of a gas carrier, an equilibrium gas chamber, an on-off valve, and a LCD display. It is reliable and easy to operate.

If you are tired of carrying calibration gas cylinders around, please think about these gas sensor calibrators. They are small, light, and precise enough for you to have the job done with no headache. You don’t need to worry about where to buy those toxic calibration gases, how accurate they could be, and what permit you need to travel with them.

HF-15 Data Sheet
HF-50 Data Sheet
CH2O-20 Data Sheet

Air Quality Monitoring

Now there are Electrochemical Sensors for monitoring low levels of CO, NO2, O3, SO2, NO and H2S.

SizeProductGasRangeResolutionResponsePart No.
7 Series7E4-CO-10CO0-10 ppm15 ppb≤35s051-1900-200
7E4-NO2-5NO0-5 ppm10 ppb≤60s057-0400-200
7E4-O3-5O30-5 ppm10 ppb≤60s068-0900-200
7E4-SO2-5SO20-5 ppm10 ppb≤60s056-0600-200
7E4-NO-10NO0-10 ppm15 ppb≤60s058-0700-200
7E4-H2S-10H2S0-10 ppm2 ppb≤90s052-0900-200
7E4-NH3-10NH30-10 ppm60ppb≤120s059-3500-200

PID (Photoionization Detection) Sensors and PID Lamps for VOCs

Now there are reliable PID (Photoionization Detection) sensors for measuring VOCs.

TypeProductGasIgnition VResponsePart No.
Lamp11.7eV-1_2 inchVOCs1800V100msUVL-117L-1111
Lamp10.6eV-1_4 inchVOCs  800V100 msUVL-106S-2001, 2000, 0500, 0100
Lamp10.6eV-3_8 inchVOCs1800V100msUVL-106M-1001 & 1501
Lamp10.6eV-1_2 inchVOCs1800V100 msUVL-106L-1001, 1500, 2001, 2501
Lamp10.6eV-1_2 inch shortVOCs1500V100msUVL-106K-2001, 1001, 1000, 0100
4 Series
      Now ATEX & IECEx Certified		4 Series PIDVOCs<5 sPID-106S-X00X
4 Series AQM PID4 Series Digital PID AQM
Air Quality Monitoring		VOCs<3 s
1ppb Resolution @0-10ppm		PID-106D-0100, 0500, 1000, 2000
4 Series 9.8eV9.8eVVOCs<5sPID-098S-0100, 05001000, 2000, 2001
7 Series7 Series PIDVOCs<5 s7PID-106K-XX0X
Application Notes:
High Resolution 4-series PIDs

Stack Emission Monitoring Electrochemical Sensors

The 3 Series (CO, SO2, NO2 and NO) are designed for stack emission monitoring. They can be used in the environment with those high concentration gases for a long time. The sensor electrodes are much bigger and deposited with thicker chemical compounds. The electrolyte used in the 3 Series Gas Sensors can sustain tougher environmental conditions than the 4 and 7 Series sensors. The 3 Series can continuously detect those high concentration gases. The 4 and 7 Series are designed to work in the relative clean environment most of time but detect toxic gases if there are leakages.

SizeProductGasRangeResolutionResponsePart No.
3 Series3CO-10000CO0-100001ppm≤30s051-3000-000
3CO-20000CO0-200001ppm
3NO-2000NO0-20001 ppm≤25s058-3000-000
3NO2-500NO20-5000.5 ppm≤35s057-3000-000
3SO2-500SO20-500≤35S
3SO2-2000SO20-20001 ppm≤35s056-3000-000

Commercial Low Cost CO Sensor

This sensor is smaller in size and lower in cost than the 4 Series sensors and works ideally for commercial and residential buildings to meet the building codes.

  • Small and low cost.
  • It gives a readout of CO concentration for applications with LCD displays.
  • Typically it is used in garages, offices and family homes.
ProductGasRangeResolutionResponsePart No.
Commercial CO SensorCO0-5001 ppm±30s051-0100-000

Sensor Module PCB

ProductPart No.
SM ECM-SMARTA01-0000-000
SM ECM-12CA01-0100-000

Application Notes:

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