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SulfiLogger™ S1/X1-1120 sensor

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The SulfiLoggerTM S1-1120 sensor continuously measures hydrogen sulfide (H2S) directly in pressurized wastewater or in biogas.


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 pressurized wastewater or wet biogas. These unique insights – among other applications – enable you to cost-optimize desulphurization processes, protect assets from H2S induced corrosion, and keep H2S levels under constant surveillance.


Measure H2S anywhere
Built to withstand the harsh conditions found in pressurized sewer lines and gas producing facilities, the SulfiLoggerTM sensor is designed to operate under anaerobic conditions and in up to 100% humidity. It is suitable for installation directly in pressurized sewer lines and virtually anywhere in biogas plants, including right after anaerobic digester or before/after desulphurization equipment.


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 Pressurized wastewater*
Measurement range Specified in the selection above
Max pressure 3 barg (44 psig)
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 is configured to one measurement media and range. Subsequent unit changes (etc. from mg/L to equivalent ppm and vice versa) are available with 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 Threaded G 1″
(ISO 228-1, BSPP)
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

Mounting options

Flow cell (recommended)
We recommend you to install the sensor in a bypassed side stream using the Gas flow cell accessory.

Direct installation
You can also install the sensor directly into a threaded fitting on the main pipe.
We do not recommend this approach however, because the sensor needs to be extracted regularly for calibrations.

Additional resources

ATEX certificate (X1-series) & DoC

Cloud data accessories

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Frequently Asked Questions.

  1. Place an order and choose a payment option at checkout.
  2. Wait for us to approve the order or suggest changes to it.
  3. Receive your products up to 3 weeks after the payment has been processed.

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 or credit card.

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

We only sell to registered companies (not to individuals)