Can a 4 Gas Detector Detect NH3 or SO2? Malaysia GuideOTYWELL Gas Detector Selection
Can a 4 Gas Detector Detect NH3 or SO2? Malaysia Guide OTYWELL Gas Detector Selection Content Can a 4 Gas Detector Detect NH3 or SO2? Not necessarily. A common misunderstanding when buying a 4 Gas Detector in Malaysia is that “4 gas” means the instrument can detect any four gases. That is not correct. A multi gas detector can only measure gases supported by its installed sensor configuration. A commonly requested four-gas combination is: O2 – Oxygen H2S – Hydrogen Sulfide CO – Carbon Monoxide LEL – Combustible Gas If you need NH3, SO2, CO2 or another specialised gas, you must confirm the detector's sensor configuration before ordering. What Does “4 Gas Detector” Mean? A 4 gas detector generally means that the instrument is configured to monitor four gas parameters. It does not mean: Any four gases can automatically be detected. The actual gases depend on: Installed sensors Instrument configuration Sensor compatibility Measurement range Detector specification Therefore, always check the exact configuration. What Are the Common 4 Gases? One commonly requested configuration is: O2 – Oxygen Used to monitor oxygen concentration. H2S – Hydrogen Sulfide Relevant to applications such as wastewater, sewer and certain industrial processes. CO – Carbon Monoxide Relevant to combustion-related environments and certain industrial applications. LEL – Combustible Gas Used for monitoring combustible gas or vapour concentration relative to the applicable lower explosive limit. This combination is common, but it is not universal for every workplace. Can a Standard 4 Gas Detector Detect NH3? Not unless the detector has an appropriate NH3 sensor. NH3 means: Ammonia If ammonia is the identified hazard, confirm that the detector is specifically configured for NH3 measurement. Do not assume an H2S or CO sensor can also measure NH3. For dedicated single-gas NH3 personal monitoring, an option such as the OTYWELL G10S-NH3 may be considered. Where active pumped sampling is required, an appropriately configured OTYWELL OT135S may be considered. Can a 4 Gas Detector Detect SO2? Again: Only if the detector is equipped and configured with an appropriate SO2 sensor. SO2 means: Sulfur Dioxide SO2 should also not be confused with H2S. SO2 Sulfur Dioxide H2S Hydrogen Sulfide They are different gases. If your application requires SO2 monitoring, specify SO2 when requesting a quotation. A dedicated OTYWELL G10S-SO2 may be considered for suitable single-gas applications. Can a 4 Gas Detector Detect CO2? Do not assume that it can. CO and CO2 are different gases. CO Carbon Monoxide CO2 Carbon Dioxide A detector equipped with a CO sensor does not automatically become a CO2 detector. If CO2 measurement is required, the detector must have the appropriate measurement capability and sensor configuration. Is LEL a Gas? No. This is another common misunderstanding. LEL stands for Lower Explosive Limit. LEL is not the name of a specific gas such as CO, H2S or NH3. A combustible gas detector may display measurements in %LEL, depending on the instrument and application. If combustible gas monitoring is required, tell the supplier which gas or vapour may be present. Can I Change the Gas Sensor Later? This depends on the instrument design. Do not assume that every gas detector allows users to simply remove one sensor and install another gas sensor. Sensor compatibility, firmware, calibration, gas range and instrument configuration may all matter. If you expect to monitor specialised gases, it is better to confirm the required configuration before ordering. Which Gas Detector Do I Need? Start with the application rather than the model number. Wastewater / Sewer Potential gases may include: H2S O2 and other site-specific hazards. Generator / Combustion Application CO may be one of the gases requiring consideration. Ammonia Refrigeration Confirm whether NH3 monitoring is required. SO2 Application Specify SO2 and the required measuring range. Tank / Confined Space Several atmospheric hazards may need to be considered, potentially requiring a multi gas detector. Single Gas or Multi Gas? A single-gas detector is not automatically inferior to a multi gas detector. If the application requires only one identified gas, a dedicated detector may be the more practical choice. For example: G10S-CO – dedicated CO monitoring G10S-H2S – dedicated H2S monitoring G10S-O2 – dedicated oxygen monitoring G10S-NH3 – dedicated ammonia monitoring G10S-SO2 – dedicated sulfur dioxide monitoring The exact sensor range and specifications should be confirmed before ordering. When Should You Consider OT135S? The OTYWELL OT135S Pumped Multi Gas Detector becomes particularly relevant when the application requires: Active pumped sampling Remote gas sampling Tank inspection Confined space pre-entry testing Manhole or sewer inspection Industrial troubleshooting Multiple gas measurements The required sensors should be selected according to the actual application. Example: Customer Requests “4 Gas + NH3” Suppose a customer asks: “I need a 4 gas detector that can also detect ammonia.” Do not immediately quote a standard four-gas model. First clarify: Which gases must be measured? Does the customer need four gases total or 4 standard gases plus NH3? What NH3 range is required? Is pumped sampling required? What is the application? The answer may require a different sensor configuration. Example: Customer Requests “H2S / SO2” Do not treat these as the same gas. Ask whether the customer needs: H2S only SO2 only or Both H2S and SO2 Then confirm whether the selected detector supports the required combination and measuring ranges. 7 Things to Confirm Before Buying Before ordering a gas detector, confirm: 1. Exact gas name 2. Number of gases 3. Measuring range 4. Application 5. Personal or pumped sampling 6. Alarm requirements 7. Required sensor configuration This can prevent ordering the wrong detector. Buying a Multi Gas Detector in Malaysia Not sure whether you need O2, H2S, CO, LEL, NH3, SO2, CO2 or another gas? Send us the actual application instead of guessing the sensor combination. Tell us: What are you testing? Where will the detector be used? Which gases may be present? Do you require pumped sampling? How many units do you need? If you are unsure about the gas, send us your application details or site photos for discussion. 4 Gas Detector Malaysia MTM Precision supplies single gas detectors, multi gas detectors and pumped gas detection instruments in Malaysia. Depending on the application, options can include OTYWELL G10S single gas detectors, G40S multi gas detectors and OT135S pumped multi gas detectors. We support enquiries from Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak. MTM Precision Sdn Bhd Showroom & Service Centre: No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia Tel: 03-8080 7172 WhatsApp: +6016-660 7346 Email: mtmpre@yahoo.com Website: www.mtmpre.com.my Contact MTM Precision for 4 Gas Detector Malaysia, NH3 Gas Detector, SO2 Gas Detector, OTYWELL OT135S, G40S and G10S enquiries.
02 Oct 2026
