SulfiLoggerTM H2S sensor

Innovative sensor for continuous monitoring of hydrogen sulfide in wastewater, air, and process gases.

The SulfiLoggerTM is an innovative new H2S sensor that continuously measures H2S directly in untreated wastewater, in the air above wastewater, and in unprocessed biogas and natural gas. It provides reliable hydrogen sulfide data and operates in rough environments including in 100% humidity and under anaerobic conditions.

By measuring H2S exactly where you want to, the sensor provides reliable insights that empower you to make smarter H2S management decisions.

Measure H2S anywhere

Measuring continuously and without interruptions in wastewater, air and wet process gases, the SulfiLoggerTM sensor is a versatile tool that is suitable for installation virtually anywhere you want to.

In wastewater applications, the sensor can be deployed throughout the network, at the treatment plant, and even inside pressurized pipes.

In biogas and natural gas applications, the sensor provides high quality insights from demanding measurements locations including right after the digester, separator or desulphurization equipment.

Other benefits of the SulfiLoggerTM sensor

The SulfiLoggerTM H2S sensor’s continuous data is always accessible.

Data is seamlessly integrated into your existing SCADA or PLC system using the analogue 4-20 mA output, while the PowerCom Box accessory enables online cloud data and battery-powered sensor operation.

Read more about the PowerCom Box here.

Hydrogen sulfide is a highly volatile gas that is difficult to measure in industrial applications. By measuring directly in raw wastewater and unprocessed gases, the SulfiLoggerTM H2S sensor provides superior insights free from the bias associated with other, indirect measurement approaches.

The SulfiLoggerTM sensor is designed for prolonged deployment in rough conditions where other sensor solutions are unable to operate. The probe operates under anaerobic conditions, in up to 100% humidity, and it can even measure directly in water.

Additionally, the X1-series sensor is ATEX certified for use even in zone 0 (see the full ATEX certificate under the sensor specifications further down on this page).

The SulfiLoggerTM H2S sensor is quickly installed in the field using the full range of SulfiLoggerTM installation accessories (available in the online store).

Periodic field calibrations can be performed to ensure reliable measurements over time. These are performed on-site using a portable calibration kit, and each calibration takes 5-10 minutes.

Hydrogen sulfide is a critical but often overlooked factor in major sewer infrastructure renewal projects including storm water separation and wastewater treatment plant centralization projects.

By utilizing a network of SulfiLoggerTM sensors installed at strategic network hotspots, you get a complete and dynamic overview of your hydrogen sulfide challenge. These insights enable you to make the necessary design changes to minimize the impact of hydrogen sulfide induced odor and corrosion.

Sensor systems for different environments

Click an image to see examples of sensor installations in different environments.

Make smarter decisions

The SulfiLoggerTM sensor’s reliable insights empower you to make smarter decisions. Among other applications, the sensor is ideal for these purposes:

Root cause analysis

Initiate measurement campaigns to find the cause of problems and prioritize mitigation activities on an informed basis.

Case study
Permanent monitoring

Permanently monitor critical hotspots without interruptions to always know what’s going on in the network.

Case study
Chemical dosing control

Control chemical/scavenger dosing operations using sensor data to achieve cost savings and improved desulfurization effectiveness.

Case study

Sensor specifications

Sensor models
SulfiLogger™ S1/X1-1020 SulfiLogger™ S1/X1-1120 SulfiLogger™ X1-1220
Measurement media Wastewater*
Air*
Pressurized wastewater*
Biogas*
Natural gas
Measurement range 0-0.5 mg/L (wastewater)
0-100 ppm (air)

0-5 mg/L (wastewater)
0-1000 ppm (air)

0-0.5 mg/L (pressurized wastewater)
0-100 ppm (biogas)

0-5 mg/L (pressurized wastewater)
0-1000 ppm (biogas)

0-100 ppm

0-1000 ppm

Max pressure 3 barg (44 psig) 3 barg (44 psig) 3 barg (44 psig)
Up to 300 barg (4350 psig) with the SulfiLoggerTM natural gas sensor system
Operating temperature range 0 °C to +40 °C
(32 °F to +104 °F)
0 °C to +40 °C
(32 °F to +104 °F)
0 °C to +60 °C
(32 °F to +140 °F)
Front design Passive anti-fouling flush front for sensor submersion Threaded G 1″
(ISO 228-1, BSPP)
Threaded G 1″
(ISO 228-1, BSPP)
Material Stainless Steel
EN 1.4404 (316L)
Stainless Steel
EN 1.4404 (316L)
Surface treated stainless steel for improved corrosion resistance
EN 1.4404 (316L)
Sensor models
SulfiLoggerTM S1/X1-1020
Measurement media Wastewater*

Air*

Measurement range 0-0.5 mg/L (wastewater)
0-100 ppm (air)

0-5 mg/L (wastewater)
0-1000 ppm (air)

Max pressure 3 barg (44 psig)
Operating temperature range 0 °C to +40 °C
(32 °F to +104 °F)
Front design Passive anti-fouling flush front for sensor submersion
Material Stainless Steel
EN 1.4404 (316L)
SulfiLoggerTM S1/X1-1120
Measurement media Pressurized wastewater*
Biogas*
Measurement range 0-0.5 mg/L (pressurized wastewater)
0-100 ppm (biogas)

0-5 mg/L (pressurized wastewater)
0-1000 ppm (biogas)

Max pressure 3 barg (44 psig)
Operating temperature range 0 °C to +40 °C
(32 °F to +104 °F)
Front design Threaded G 1″
(ISO 228-1, BSPP)
Material Stainless Steel
EN 1.4404 (316L)
SulfiLoggerTM X1-1220
Measurement media Natural gas
Measurement range 0-100 ppm

0-1000 ppm

Max pressure 3 barg (44 psig)
Up to 300 barg (4350 psig) with the SulfiLoggerTM natural gas sensor system
Operating temperature range 0 °C to +40 °C
(32 °F to +104 °F)
Front design Threaded G 1″
(ISO 228-1, BSPP)
Material Surface treated stainless steel for improved corrosion resistance
EN 1.4404 (316L)

* 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.

Technical specifications
Accuracy +/- 5%
Detection limit 1% of full range
Response time <25 seconds
Operating humidity range 0-100%
Max water depth 10 metres
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)

Batteries**

Data output options 4-20 mA analogue signal

RS-232 digital signal

Cloud data**

** with the PowerCom Box accessory only.

Mechanical & other specifications
Length 240 mm (9.4 in)
Diameter Ø48.3 mm / 1½” pipe
Weight 0.85 kg (1.9 lb)
Certification S1-series:

X1-series:

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

*** when used in accordance with the Installation Manual.

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