DD Scientific Electrochemical Gas Sensors
Teledyne DD-Scientific of Portchester, UK, has made electrochemical gas sensors since 2011 for oxygen, carbon monoxide, hydrogen sulphide, ammonia, ethylene oxide and other gases.
4-Series Toxic Gas Sensors: CO, H2S, SO2, NO2
GS+4CO measures carbon monoxide over 0–2000 ppm with a 70 ± 20 nA/ppm output, GS+4H2S covers hydrogen sulphide 0–100 ppm, GS+4SO2 sulphur dioxide 0–20 ppm and GS+4NO2 nitrogen dioxide 0–30 ppm. All run at 0V bias with a 3 pin 4-Series interface.
- GS+4CO: CO 0–2000 ppm
- GS+4H2S: H2S 0–100 ppm
- GS+4SO2: SO2 0–20 ppm
- GS+4NO2: NO2 0–30 ppm, UL2075
GS+4NH3 and DceL NH3 Ammonia Sensors
The ammonia range is split by span: GS+4NH3-100 covers 0–100 ppm with a 100 ± 30 nA/ppm output, GS+4NH3-1000 covers 0–1000 ppm and GS+4NH3-10000 covers 0–5000 ppm with a 10000 ppm overload. The low profile DceL NH3 covers 0–500 ppm and is interchangeable with 4-Series.
- GS+4NH3-100: 0–100 ppm
- GS+4NH3-1000: 0–1000 ppm
- GS+4NH3-10000: 0–5000 ppm
- DceL NH3: 0–500 ppm
Biased Ethylene Oxide and Nitric Oxide Sensors
GS+4ETO measures ethylene oxide over 0–20 ppm with a 1900 ± 600 nA/ppm output and requires +300mV bias. GS+7ETO in the 7-Series package gives 2600 ± 700 nA/ppm, and the medical MD+7ETO covers 0–5 ppm. GS+4NO measures nitric oxide 0–250 ppm, also at +300mV bias.
- GS+4ETO: ETO 0–20 ppm
- ETO and NO bias: +300mV
- MD+7ETO: ETO 0–5 ppm
- GS+4NO: NO 0–250 ppm
Oxygen Sensors: Lead, Lead-free and Partial Pressure
S+4OX covers 0–25% oxygen at 0V bias. The lead-free S+4OXLF and DceL OXLF require -600mV bias and offer 5 years+ typical life. S+AOX, S+EOX and the medical MD+VOX measure 0–100% oxygen with a 9–14mV output in air and a Molex connection.
- S+4OX: 0–25% O2, 0V bias
- S+4OXLF: -600mV bias
- Lead-free: 5 years+ typical life
- S+AOX, S+EOX: 0–100% O2
Low Profile DceL, MceL and Dual Toxic DT Sensors
The DceL package is interchangeable with 4-Series: DceL CO measures carbon monoxide 0–1000 ppm. The 4 pin GS+4DT measures CO 0–1000 ppm and H2S 0–100 ppm in one sensor. MceL 2ECO covers carbon monoxide 0–500 ppm with a 10 year life.
- DceL CO: CO 0–1000 ppm
- GS+4DT: dual CO and H2S channels
- MceL 2ECO: 10 year life
- DceL: 4-Series interchangeable
PCB-XXX Transmitters for 4-Series and DceL Sensors
The PCB-XXX transmitter works with 4-Series and DceL toxic sensors, biased and unbiased. It is supplied as a calibrated pair with the sensor. Outputs are ModBus, RS485, I2C and 4-20mA, and free software is supplied for fine tuning and programming of the PCB.
- 4-20mA analogue output
- ModBus, RS485 and I2C outputs
- Supplied as a calibrated pair
- Fits 4-Series and DceL sensors
Selecting a DD Scientific Electrochemical Sensor
A sensor is chosen by target gas, range and package. The 4-Series package is common in industrial gas detectors, the low profile DceL is interchangeable with it, MceL suits compact instruments, and 5-Series and 7-Series serve emissions and industrial safety instruments.
For oxygen choose lead OX sensors at 0V bias, lead-free OXLF sensors at -600mV bias with 5 years+ typical life, or AOX, EOX and VOX partial pressure sensors for 0–100% oxygen.
Instrument Integration and Outputs
The circuit depends on the number of pins and the bias: the manufacturer publishes 2-electrode, 3-electrode and 4-electrode circuits, plus circuits for Dual Toxic and biased sensors.
PCB-XXX transmitters are supplied as a calibrated pair with the sensor and offer 4-20mA, ModBus, RS485 and I2C outputs.
DD Scientific and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of DD Scientific and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.
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Documents and sources
- Our Story
- Quality at Teledyne DD-Scientific
- Circuit Diagrams
- Frequently Asked Questions
- Gas Sensor Packages
- GS+4CO Carbon Monoxide Sensor
- GS+4H2S Hydrogen Sulphide Sensor
- GS+4SO2 Sulphur Dioxide Sensor
- GS+4NO2 Nitrogen Dioxide Sensor
- GS+4NH3-100 Ammonia Sensor
- GS+4NH3-1000 Ammonia Sensor
- GS+4NH3-10000 Ammonia Sensor
- DceL NH3 Ammonia Sensor
- GS+4ETO Ethylene Oxide Sensor
- GS+7ETO Ethylene Oxide Sensor
- MD+7ETO Ethylene Oxide Sensor
- GS+4NO Nitric Oxide Sensor
- S+4OX Oxygen Sensor
- S+4OXLF Lead-free Oxygen Sensor
- DceL OXLF Oxygen Sensor
- S+AOX Oxygen Sensor
- S+EOX Oxygen Sensor
- MD+VOX Oxygen Sensor
- DceL CO Carbon Monoxide Sensor
- GS+4DT Dual Toxic Sensor
- MceL 2ECO Carbon Monoxide Sensor
- PCB-XXX PCB Transmitter
