SulfiLogger™ S1/X1-1020 sensor

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The SulfiLoggerTM S1-1020 sensor continuously measures hydrogen sulfide (H2S) directly in untreated wastewater or in the air above wastewater.


Please configure your sensor’s measurement media and range.

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Reliable H2S insights
The SulfiLoggerTM H2S sensor provides reliable insights into your H2S challenge by continuously measuring H2S directly in raw wastewater and in the air above. These unique insights – among other applications – enable you to pinpoint target areas for further H2S mitigation, to permanently monitor critical hotspots, or to control chemical dosing stations.


Measure H2S anywhere in sewer networks or at treatment plants
Built to withstand the harsh conditions found in sewer networks, the SulfiLoggerTM sensor is designed to operate under anaerobic conditions and in up to 100% humidity. It is suitable for both permanent H2S monitoring and portable sulfide mapping campaigns in the entire collection system and at wastewater treatment plants.


Data anywhere, anytime
The SulfiLoggerTM sensor delivers continuous data directly into existing SCADA/PLC systems in real-time using an analogue 4-20mA output, while the PowerCom Box accessory enables cloud data and battery-powered operation, effectively transforming the sensor into a self-contained sensor system that can operate in locations without SCADA connectivity.

Technical specifications

Measurement media* Wastewater
Measurement range* Specified in the selection above
Max water depth 10 metres
Accuracy +/- 5%
Detection limit 1% of full range
Response time <25 seconds
Operating humidity range 0-100%
Operating temperature range 0 °C to +40 °C
(32 °F to +104 °F)
Storage temperature range 0 °C to +40 °C
(32 °F to +104 °F)
Design temperature range -20 °C to +60 °C
(-4 °F to +140 °F)
Power input options 4-20 mA loop power
DC power (12-28 VDC)
Data output options 4-20 mA analogue signal
RS-232 digital signal
Cloud data**

* The sensor’s analogue 4-20 mA signal is configured to one measurement media and range. Data can be read out in both mg/L and ppm in SulfiLoggerTM WebData (requires the PowerCom Box).

** With the PowerCom Box accessory.

Mechanical specifications

Length 240 mm (9.4 in)
Diameter Ø48.3 mm / 1 ½” pipe
Weight 0.85 kg (1.9 lb)
Front design Passive anti-fouling flush front for sensor submersion
Material Stainless Steel
EN 1.4404 (316L)

Other specifications

Warranty 12 months***
Certification (S1-series)
Certification (X1-series)
ATEX marking (X1-series)**** II 1G    Ex ia IIC T4 Ga

*** When used in accordance with the Installation Manual.
**** Additional Ex specifications are listed in the Installation Manual.

Mounting options

For installations directly in wastewater, we recommend you to use SulfiLogger installation accessories (found under “accessories” in the shop).

For more information about typical wastewater installations, we encourage you to check out our sensor systems configured specifically for use in manholes/reservoirs.

Additional resources

ATEX certificate (X1-series) & DoC

Cloud data accessories

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Products are available for sale and delivery to registered companies in the European Economic Area EEA (all EU and EFTA member states), and to Switzerland, the United Kingdom, the United States, and Canada.

For inquiries outside of these geographic regions, please contact us.

Products are shipped via UPS.

Delivery charges are calculated at checkout.

Prepayment by bank transfer.

All prices are excluding VAT, import duties and sales taxes.

We only sell to registered companies (not to individuals)