Eranntex MS104K-M Hydrogen Sulphide H2S Detector Malaysia
Eranntex MS104K-M Hydrogen Sulphide H2S Detector Malaysia
Hydrogen sulphide is a toxic gas that may be present in sewers, wastewater plants, sludge tanks, manholes, palm oil facilities and other industrial environments.
An Eranntex MS104K-M portable multi-gas detector configured with an H₂S sensor can provide continuous concentration readings and alarms for personal protection, confined-space entry and maintenance work.
What Is Hydrogen Sulphide?
Hydrogen sulphide, or H₂S, is a gas commonly associated with the decomposition of organic material under low-oxygen conditions.
Potential sources include:
Sewage and wastewater
Sludge
Animal waste
Palm oil effluent
Petroleum processes
Sulphur-containing chemicals
Industrial drains
Organic material inside tanks
The actual concentration can change quickly when sludge or process residue is disturbed.
Can You Detect H₂S by Smell?
Hydrogen sulphide may produce a rotten-egg odour at low concentrations, but workers must never rely on smell to determine whether an area is safe.
Continued exposure can reduce a person’s ability to notice the smell. This is known as olfactory fatigue.
The disappearance of the odour does not prove that the gas has disappeared.
A suitable gas detector is required.
Where Can H₂S Accumulate?
Potential locations include:
Manholes
Sewers
Wastewater tanks
Pump stations
Sludge pits
Underground chambers
Effluent-treatment plants
Palm oil mills
Storage tanks
Process vessels
Oil and gas facilities
Poorly ventilated drains
Low or enclosed areas may be especially dangerous when ventilation is inadequate.
Common Four-Gas Configuration
For general industrial and confined-space safety, the MS104K-M may be configured with:
H₂S: Hydrogen sulphide
O₂: Oxygen
EX: Combustible gas
CO: Carbon monoxide
This combination covers several common atmospheric hazards using one portable instrument.
However, the correct gas combination must follow the workplace risk assessment.
Why Measure More Than H₂S?
An area containing H₂S may also have:
Oxygen deficiency
Combustible methane
Carbon monoxide
Other toxic gases
A normal H₂S reading does not prove that the complete atmosphere is safe.
This is why multi-gas monitoring is commonly used for sewer, tank and manhole entry.
H₂S Monitoring in Wastewater Facilities
Hydrogen sulphide may form when sulphur-containing organic material decomposes without sufficient oxygen.
Higher-risk locations can include:
Inlet works
Equalisation tanks
Sludge tanks
Pump stations
Covered drains
Manholes
Effluent pits
Enclosed treatment areas
Concentrations may rise when pumps start, covers are opened or sludge is agitated.
Monitoring should consider both routine work and maintenance activities.
H₂S Risks in Palm Oil Facilities
Palm oil mills and effluent-treatment areas may contain organic material capable of producing hazardous gases.
Potential monitoring locations include:
Palm oil mill effluent systems
Anaerobic-treatment areas
Sludge tanks
Covered ponds
Pump chambers
Manholes
Drainage systems
The required gas configuration should be determined from the plant’s process and safety assessment.
Pre-Entry Pump Sampling
For a manhole, tank or underground chamber, initial gas testing should be conducted from outside according to the site procedure.
The MS104K-M can use an external pump and sampling hose to draw gas from different depths.
Possible sampling points include:
Just below the opening
The middle section
Near the bottom
Close to sludge or wastewater
Near connected pipelines
Allow enough time for the sample to travel through the hose and reach the H₂S sensor.
Protect the Hose from Water and Sludge
Wet environments can block or contaminate the sampling system.
Use suitable:
Sampling probes
Dust filters
Moisture filters
Water traps
Gas-compatible tubing
Never place an unprotected sampling inlet directly into wastewater or sludge.
If a pump-blockage alarm occurs, stop relying on the measurement and inspect the complete sampling path.
Continuous Monitoring During Work
A safe pre-entry reading does not guarantee that the space will remain safe.
H₂S concentrations may change when:
Sludge is disturbed
Wastewater begins flowing
A pump starts
A cover is removed
Temperature changes
Ventilation stops
A valve is opened
Cleaning begins
Continuous or repeated monitoring should follow the confined-space or maintenance procedure.
What Should You Do When the H₂S Alarm Activates?
If the detector alarms:
Follow the site’s emergency procedure
Leave or do not enter the affected area
Do not ignore or silence the alarm
Warn other personnel
Inform the responsible supervisor
Investigate from a safe location
Ventilate where appropriate
Retest before allowing re-entry
Do not attempt to locate the gas source without the correct training and protective equipment.
Selecting the H₂S Measuring Range
The required range depends on whether the instrument is used for:
Personal exposure monitoring
Confined-space entry
Leak investigation
Wastewater maintenance
Emergency response
High-concentration process measurement
A very high measuring range is not automatically better for low-level personnel protection.
The expected concentration, required resolution and alarm thresholds should be confirmed before ordering.
Why Does the H₂S Reading Remain Above Zero?
Possible reasons include:
H₂S remains in the area
Gas is trapped in the sampling hose
Contaminated filter or tubing
Slow sensor recovery after exposure
Cross-sensitive gases
Incorrect fresh-air adjustment
Calibration drift
Sensor ageing
Sensor fault
Move the detector into a known clean atmosphere and follow the required checking procedure.
Do not zero the detector in an atmosphere that has not been confirmed as clean.
Bump Test and Calibration
A bump test confirms that the H₂S sensor responds and activates the detector’s alarms.
Calibration verifies and adjusts the measurement using certified reference gas.
Calibration or technical inspection may be required after:
A failed bump test
Sensor replacement
Over-range exposure
Physical damage
Long-term storage
Unstable readings
Scheduled calibration expiry
A detector that fails testing should not be returned to safety use until the issue has been corrected.
H₂S Sensor Life
H₂S sensors have a limited working life.
Their performance may be affected by:
Natural ageing
High gas exposure
Temperature and humidity
Chemical contamination
Storage conditions
Frequency of use
Calibration history
A sensor may require replacement if it becomes slow, unstable or unable to pass calibration.
Common H₂S Monitoring Mistakes
Avoid:
Relying on smell
Testing only at the opening
Entering before pre-entry sampling
Using an incorrect measuring range
Recording a pump sample too quickly
Allowing the hose to contact liquid
Ignoring pump-blockage warnings
Skipping bump tests
Continuing work after an alarm
Assuming a low H₂S reading means all gases are safe
Multi-gas monitoring must form part of a complete workplace safety system.
Information Required for an H₂S Detector Quotation
Provide:
Industry and work location
Expected H₂S source
Required measuring range
Other gases to be monitored
Diffusion or pump-sampling requirement
Sampling depth
Number of detectors
Required accessories
Calibration or documentation requirements
This allows the MS104K-M to be configured for the actual application.
Why Choose MTM Precision?
MTM Precision supplies gas detectors, environmental monitoring instruments, industrial testing equipment and safety measurement solutions throughout Malaysia.
Our team can assist with:
H₂S detector selection
Multi-gas sensor configuration
Measuring-range confirmation
Wastewater and confined-space applications
Diffusion and pump-sampling requirements
Sampling accessories
Product quotation and availability
Basic operating guidance
After-sales and technical coordination
Request an Eranntex MS104K-M Quotation
Tell MTM Precision where hydrogen sulphide may be present and which additional gases must be monitored.
We can help determine whether an H₂S-equipped MS104K-M is suitable for the application.
Contact MTM Precision
MTM Precision Sdn Bhd
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Website: www.mtmpre.com.my
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
We support customers throughout Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Perlis, Terengganu, Sabah and Sarawak.
14 Sep 2026
