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. 
DDS technical drawing of 4 series sensor

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  • GS+4CL2 Chlorine (CL2) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4CO Carbon Monoxide (CO) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4CO-HC Carbon Monoxide (CO) Sensor | High concentration
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4CO-HH Carbon Monoxide (CO) Sensor | High Humidity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4CO-HO Carbon Monoxide (CO) Sensor | High Output
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4CO2H Carbon Monoxide (CO) Sensor | Low H2 cross-sensitivity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4COF Carbon Monoxide (CO) Sensor | Heavy filter
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4COF-M Carbon Monoxide (CO) Sensor | High Concentration
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4COSLiM Carbon Monoxide (CO) Sensor | UL2075, Low cost
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4DT Dual Carbon Monoxide / Hydrogen Sulphide (CO/H2S) Sensor | Dual channel
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4ETO Ethylene Oxide (ETO) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2-1000 Hydrogen (H2) Sensor | Low range (0-1000ppm) | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2-5% Hydrogen (H2) Sensor | Extended range (0-5%)
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2-5000 Hydrogen (H2) Sensor | High range | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2-CO 1000 Hydrogen (H2) Sensor | Low Range 0 -1000ppm | Low CO Cross Sensitivity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2-CO 5% Hydrogen (H2) Sensor | Extended range (0-5%) | Low CO Cross Sensitivity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2-CO 5000 Hydrogen (H2) Sensor | High Range | Low CO Cross Sensitivity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2S HO Hydrogen Sulphide (H2S) Sensor | High output
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2S HT Hydrogen Sulphide (H2S) Sensor | High temperature
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2S Hydrogen Sulphide (H2S) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2S-300 Hydrogen Sulphide (H2S) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4H2S-HC Hydrogen Sulphide (H2S) Sensor | High concentration
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4HCL Hydrogen Chloride (HCl) Sensor | Industrial Specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NH3-100 Ammonia (NH3) Sensor | Low range (0-100ppm)
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NH3-1000 Ammonia (NH3) Sensor | High range (0-1000ppm)
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NH3-10000 Ammonia (NH3) Sensor | Extended range (0-10000ppm)
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NH3-300 Ammonia (NH3) Sensor | Medium range (0-300ppm)
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NO Nitric Oxide (NO) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NO-E Nitric Oxide (NO) Sensor | Emissions specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NO2 Nitrogen Dioxide (NO2) Sensor | UL2075, Industrial
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NO2-E Nitrogen Dioxide (NO2) Sensor | Emissions specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NO2-HH Nitrogen Dioxide (NO2) Sensor | High-humidity resistance
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4NO2-TH Nitrogen Dioxide (NO2) Sensor | Low humidity response
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4O3 Ozone (O3) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4O3-HO Ozone (O3) Sensor | Industrial specification | Low Cost
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4O3-O Ozone (O3) Sensor | Industrial specification | Low Cost
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4SO2 Sulphur Dioxide (SO2) Sensor | Industrial specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+4SO2-E Sulphur Dioxide (SO2) Sensor | Emissions specification
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • GS+A4COF Carbon Monoxide (CO) Sensor | Ultra-low H2 cross-sensitivity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • S+4 2ECO Kohlenmonoxid (CO) Sensor | UL2075, Kostengünstig
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • S+4 2ECOH Carbon Monoxide (CO) Sensor | Low H2 cross-sensitivity, High output
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • S+4 2ECOLH Carbon Monoxide (CO) Sensor | Low H2 cross-sensitivity
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • S+4 2ECOLP Carbon Monoxide (CO) Sensor | UL2075, Low profile
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • S+4 2ECOS Carbon Monoxide (CO) Sensor | Ultra-low cost
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
  • S+4 2NO2 Nitrogen Dioxide (NO2) Sensor | Low cost
    ⚠️ Submit account application to view pricing. OEM Pricing is available upon request.
Close up photo of DDS sensor document

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.