Inline H2S sensor for rough environments

Measure H2S anywhere

Continuously monitor hydrogen sulfide levels in wastewater, air, and process gases with the game-changing SulfiLoggerTM H2S sensor – a robust probe that delivers superior insights in rough environments.


X1 series sensors

H2S sensor for industrial applications

Measure H2S in extreme environments in wastewater, biogas, oil & gas, and other industries including aquaculture, pulp & paper, and industrial manufacturing.

Wastewater

Continuously measure H2S directly in wastewater for superior insights in sewer networks and at wastewater treatment plants.

Biogas

Monitor H2S continuously in wet biogas immediately after the anaerobic digester or desulphurization processes.

Oil & Gas

Measure right after the oil & gas separator to follow the development in H2S and to eliminate the need for manual sampling.

Benefits

Get the right H2S data, with no interruptions and minimal hassle, and take your odor and corrosion control strategy to the next level.

Get the right H2S data…

Measure H2S directly in untreated wastewater or wet gases for superior insights.

  • Measure in 0-100% humidity
  • Measure in wastewater, gases, or air
  • Measure in high temperature/pressure
…with no interruptions…

Get insights on any time scale to spot seasonal effects, daily patterns, and unexpected spikes.

  • Continuous sensor data
  • Long-term data with no dry-out needed
  • Data in SCADA, in the cloud, or via RS-232
… and minimal hassle.

Get started and keep the sensor’s high accuracy over time with minimal hassle.

  • SulfiLogger supplies all mounting hardware

  • No preconditioning or sampling needed

  • 10-minute calibration every 3rd month

H2S sensor specifications

The SulfiLoggerTM H2S sensor uses a novel and patent-pending technology that is robust in challenging environments.

H2S sensor models

 

SulfiLoggerTM S1/X1-1020
Application Wastewater
Measurement media Wastewater
Air
Measurement range Low range
0-0.5 mg/L
0-100 ppm
Normal range
0-5 mg/L
0-1000 ppm
Custom range
Custom measurement ranges upon request
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)
Price
SulfiLoggerTM S1/X1-1120
Application Biogas
Measurement media Biogas
Biomethane
CO2
Sludge
Measurement range Low range
0-0.5 mg/L
0-100 ppm
Normal range
0-5 mg/L
0-1000 ppm
Custom range
Custom measurement ranges upon request
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)
Price
SulfiLoggerTM X1-1220
Application Oil & gas
Measurement media Natural gas
Oil
Produced water
Measurement range Low range
0-0.5 mg/L
0-100 ppm
Normal range
0-5 mg/L
0-1000 ppm
Custom range
Custom measurement ranges upon request
Max pressure 3 barg (44 psig)
Custom pressure rating upon request
Operating temperature range 0 °C to +60 °C
(32 °F to +140 °F)
Front design Threaded G 1″
(ISO 228-1, BSPP)
Material Surface treated stainless steel for improved corrosion resistance
EN 1.4404 (316L)
Price
H2S sensor models
SulfiLoggerTM S1/X1-1020 SulfiLoggerTM S1/X1-1120 SulfiLoggerTM X1-1220
Application Wastewater Biogas Oil & gas
Measurement media Wastewater
Air		 Biogas
Biomethane
CO2
Sludge		 Natural gas
Oil
Produced water
Measurement range Low range
0-0.5 mg/L
0-100 ppm		 Low range
0-0.5 mg/L
0-100 ppm		 Low range
0-0.5 mg/L
0-100 ppm
Normal range
0-5 mg/L
0-1000 ppm		 Normal range
0-5 mg/L
0-1000 ppm		 Normal range
0-5 mg/L
0-1000 ppm
Custom range
Custom measurement ranges upon request		 Custom range
Custom measurement ranges upon request		 Custom range
Custom measurement ranges upon request
Max pressure 3 barg (44 psig) 3 barg (44 psig) 3 barg (44 psig)
Custom pressure rating upon request
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)
Price
Technical specifications
Accuracy +/- 5% of reading
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 only.

Mechanical & other specifications
Length 240 mm (9.4 in)
Diameter 48.3 mm (1.9 in)
Weight 0.85 kg (1.9 lb)
Warranty 2 years**
Chemical interferences specifications

** When used in accordance with the Installation Manual.

Certification
S1-series:
X1-series:

  • ETL listed (cETLus marked) to Canadian and US General Safety and Hazardous (Class l, Div. 1) Locations***
  • ATEX, UKEX, and IECEx approved for use in Zone 0 Hazardous Areas (Ex II 1G Ex ia IIC T4 Ga)***

*** SulfiLogger™ X1 only. Certificates are available on sulfilogger.com/support.

Trusted

The SulfiLogger™ sensor is in operation in +30 countries world-wide.

  • "After struggling with H₂S meters that couldn't handle moisture, the City of Grand Rapids WRRF switched to SulfiLogger.

    We now receive consistent, reliable readings, allowing us to monitor our digesters and H₂S removal media effectively. We’ve had great success with these sensors and recommend them to any facility dealing with high-moisture processes."

    City of Grand Rapids, MI
    Wastewater Operations & Maintenance Supervisor

  • "We are very satisfied with the sensor. The reliable measurement results are available to us in real time and help us to control our production efficiently and safely."

    Thyssenkrupp Electrical Steel GmbH
    Dr. Jan Mundry, Scientific Associate

  • "After installing a SulfiLogger sensor for liquid-phase measurements, we now have reliable insights into how industrial sewage discharges affect H₂S levels in the collection system."

    Energi Viborg
    Gerhard Wirenfeldt, Technical Coordinator

  • "The sensor is used in our laboratory to measure and test filter performance, helping us optimise the lifetime and effectiveness of our filters.

    The SulfiLogger sensor has significantly simplified and improved our data collection when performing H₂S tests on filters."

    Camfil AB
    Laboratory Engineer

  • "By installing SulfiLogger sensors in odor control systems in wastewater applications, we can continuously evaluate H₂S removal efficiency.

    This has improved process transparency, optimised filter operation, and enhanced overall system reliability."

    Dimtech S.A.
    Theocharis Sideris, Environmental Engineer

  • "We used to take tube measurements when something didn’t seem right, but it only gave us snapshots - not the full picture.

    With the SulfiLogger sensor’s continuous data, we now have a watchdog that alerts us if something is off. It helps us to react fast and optimize carbon filter performance, so we e.g. don’t change media too early or risk running it for too long."

    Vesthimmerland Biogas (BioCirc)
    Flemming Nielsen, Production Manager

  • "We have 4 Sulfiloggers in operation across our wastewater system. Two are used to optimise iron(II) chloride dosing in pressure pipelines, while the other two are used to monitor H₂S levels and support testing of microorganisms in the sewer system.

    Overall, the Sulfiloggers are an excellent operational tool. The data quality is outstanding, maintenance is extremely easy, and after more than a year of continuous operation, we have not noticed any significant wear."

    Wolfburger Entwässerungsbetriebe
    Thomas Rechlin, Head of Department for Treatment Plants and Pumping Stations

  • "We use two SulfiLogger sensors (one placed in the liquid and one in the air) to investigate a location, where we have a suspicion of elevated H₂S levels.

    The measurement data is crucial for assessing the severity of the problem and selecting the appropriate solution. If the results confirm our suspicions, we will explore the possibility of a filtration solution or other relevant mitigation measures.

    After this project, we plan to relocate the sensors to other locations within the sewer network where hydrogen sulfide also is suspected."

    SonFor
    Thor Krogh Harfot, Maskinmester

  • "We have successfully deployed SulfiLogger sensors across diverse applications, including drinking water reservoirs, irrigation wells, industrial and municipal wastewater systems, and landfill leachate.

    The technology has proven consistently reliable, delivering accurate, real-time sulfide data that enhances system understanding and supports process optimization. The sensors’ robustness and durability under varied field conditions have been particularly impressive."

    Nanoplus Limited
    Raphi Mandelbaum, Managing Director

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