The 4-series, also referred to as the A-Series by some manufacturers, is a 20mm diameter compact sensor format with  either 2, 3 or 4-pin confguration depending upon the application.

Frequently used in portable instruments, the 4-series package balances performance with size and is the most commonly used electrochemical sensor package globally. 

The DDS 4-series sensor range includes dual-toxic and both lead and lead-free O2 sensors among almost 40 models, with more being added frequently.   

🔍 Use the filters below to view sensors within the range. 
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Showing 44 of 44 products

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Showing 44 of 44 products
  • GS+4CL2 Chlorine (CL2) Sensor | Industrial specification
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  • GS+4CO Carbon Monoxide (CO) Sensor | Industrial specification
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  • GS+4CO-HC Carbon Monoxide (CO) Sensor | High concentration
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  • GS+4CO2H Carbon Monoxide (CO) Sensor | Low H2 cross-sensitivity
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  • GS+4COF Carbon Monoxide (CO) Sensor | Heavy filter
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  • GS+4COF-M Carbon Monoxide (CO) Sensor | High Concentration
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  • GS+4COSLiM Carbon Monoxide (CO) Sensor | UL2075, Low cost
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  • GS+4DT Dual Carbon Monoxide / Hydrogen Sulphide (CO/H2S) Sensor | Dual channel
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  • GS+4ETO Ethylene Oxide (ETO) Sensor | Industrial specification
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  • GS+4H2-1000 Hydrogen (H2) Sensor | Low range (0-1000ppm) | Industrial specification
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  • GS+4H2-5% Hydrogen (H2) Sensor | Extended range (0-5%)
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  • GS+4H2-5000 Hydrogen (H2) Sensor | High range | Industrial specification
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  • GS+4H2-CO 1000 Hydrogen (H2) Sensor | Low Range 0 -1000ppm | Low CO Cross Sensitivity
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  • GS+4H2-CO 5% Hydrogen (H2) Sensor | Extended range (0-5%) | Low CO Cross Sensitivity
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  • GS+4H2-CO 5000 Hydrogen (H2) Sensor | High Range | Low CO Cross Sensitivity
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  • GS+4H2S HO Hydrogen Sulphide (H2S) Sensor | High output
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  • GS+4H2S HT Hydrogen Sulphide (H2S) Sensor | High temperature
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  • GS+4H2S Hydrogen Sulphide (H2S) Sensor | Industrial specification
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  • GS+4H2S-HC Hydrogen Sulphide (H2S) Sensor | High concentration
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  • GS+4NH3-100 Ammonia (NH3) Sensor | Low range (0-100ppm)
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  • GS+4NH3-1000 Ammonia (NH3) Sensor | High range (0-1000ppm)
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  • GS+4NH3-10000 Ammonia (NH3) Sensor | Extended range (0-10000ppm)
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  • GS+4NH3-300 Ammonia (NH3) Sensor | Medium range (0-300ppm)
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  • GS+4NO Nitric Oxide (NO) Sensor | Industrial specification
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  • GS+4NO-E Nitric Oxide (NO) Sensor | Emissions specification
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  • GS+4NO2 Nitrogen Dioxide (NO2) Sensor | UL2075, Industrial
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  • GS+4NO2-E Nitrogen Dioxide (NO2) Sensor | Emissions specification
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  • GS+4NO2-TH Nitrogen Dioxide (NO2) Sensor | Low humidity response
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  • GS+4O3 Ozone (O3) Sensor | Industrial specification
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  • GS+4O3-O Ozone (O3) Sensor | Industrial specification | Low Cost
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  • GS+4SO2 Sulphur Dioxide (SO2) Sensor | Industrial specification
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  • GS+4SO2-E Sulphur Dioxide (SO2) Sensor | Emissions specification
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  • GS+A4COF Carbon Monoxide (CO) Sensor | Ultra-low H2 cross-sensitivity
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  • S+4 2ECO Carbon Monoxide (CO) Sensor | UL2075, Low cost
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  • S+4 2ECOH Carbon Monoxide (CO) Sensor | UL2075, Low H2 cross-sensitivity, High output, Breath analysis
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  • S+4 2ECOLH Carbon Monoxide (CO) Sensor | UL2075, Low H2 cross-sensitivity
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  • S+4 2ECOLP Carbon Monoxide (CO) Sensor | UL2075, Low profile
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  • S+4 2ECOS Carbon Monoxide (CO) Sensor | UL2075, Ultra-low cost
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  • S+4 2NO2 Nitrogen Dioxide (NO2) Sensor | Low cost
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  • S+4OX Oxygen (O2) Sensor | Industrial specification
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  • S+4OX3 Oxygen (O2) Sensor | Industrial specification, extended warranty
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  • S+4OXLF Oxygen (O2) Sensor | Lead-free (RoHs), 5-year life
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  • S+4OXLF-LO Oxygen (O2) Sensor | Lead-free (RoHs), 5-year life, Low power
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  • S+4OXLFP Oxygen (O2) Sensor | Lead-free (RoHs), 5-year life, For pumped instruments
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Can't see the 4-Series sensor you were looking for?

Our website captures the 4-Series sensors we currently have in production but it doesn't include those we have in development.

Our portfolio has grown significantly in recent years and is due to increase further with the planned introduction of more than 25 new sensor models over the next 12 months.

If you have a requirement for a 4-Series sensor we dont have listed we would love to hear from you - we frequently build customer specials where there is a demonstrable need. 

To talk to one of our application specialists - get in touch today.