--- title: Infinity-Tx Hazardous Area Oxygen Transmitter url: https://www.sarveshanalytics.com/oxygen-transmitter.html description: Infinity-Tx two-wire loop-powered oxygen transmitter for hazardous areas: percent O2 and trace CO, inbuilt filter and scrubber. updated: 2026-11-03 source: html --- Hazardous area · Field transmitter # INFINITY-Tx two-wire gas transmitter for hazardous areas INFINITY-Tx is a loop-powered, two-wire gas transmitter. It measures percent oxygen and trace carbon monoxide in hazardous areas and mounts directly in the field, so you avoid long sample lines. - ISO 9001:2015, certified by TÜV - Designed and built in Pune since 2002 - Supplied to Reliance, Tata Steel, Indian Oil, Linde and ISRO Quick answer INFINITY-Tx is a loop-powered two-wire transmitter for percent oxygen and trace CO in hazardous areas. It has an inbuilt filter and scrubber, works on very low flow and pressure samples, and mounts directly in the field. Updated 3 November 2026 · Figures from Sarvesh datasheets ## Why INFINITY-Tx ### Measures at the process Mounted directly in the field, so the reading is taken where the gas is, without a long sample line. ### Two wires, no separate supply Loop powered: the same pair carries power and the 4–20 mA signal. ### Handles difficult samples A built-in filter and scrubber, and suited to very low flow and pressure samples. ## Specifications | Item | Specification | Notes | |---|---|---| | Measurement | Percent oxygen, 0 to 25 %; trace CO, 0 to 199 ppm | Display and 4-20 mA over the same range | | Sensor | Electrochemical, life above 2 years | Long calibration interval | | Repeatability | 1 % of full scale | Resolution 0.1; T90 below 30 s at 1 LPM | | Display | 3½ digit LCD | | | Housing | Flameproof and weatherproof, IP 66 | Pipe mountable with canopy | | Area classification | Gas Group IIC, Zone 1 and 2, T6 | As per IS/IEC 60079-1:2014 | | Power | 24 V DC, two-wire loop powered | | | Sample | 5 to 40 °C; inbuilt filter and scrubber | Suits very low flow and pressure samples | From the current Sarvesh product datasheets and company profile. Specifications may change without notice as products improve. The final responsibility to check that a product meets the process and analyser requirement remains with the customer. ## Key features - Loop-powered two-wire design - Inbuilt filter and scrubber - Works with very low flow and low pressure samples - Direct field installation ## How it works Where an oxygen reading is needed at a vessel, vent or pipe rack, a panel analyser with a sample line is more equipment than the job needs. A two-wire transmitter puts the measurement at the point of use and sends a 4-20 mA signal over the pair that powers it. When you enquire, tell us the gas and range, the sample pressure and whether it is above or below atmospheric, the vessel or line where it will mount, and the area classification and temperature class. A transmitter on a vent reads whatever the vent carries, so mount it where the gas is representative of the headspace. ## Requirements and limits - Confirm area certification for your zone. ## On site: utilities and calibration gases What to have ready at your plant before installation and commissioning. | Item | Requirement | Notes | |---|---|---| | Power | 24 V DC, two-wire loop powered | The loop carries power and the 4-20 mA signal | | Zero gas | Zero-grade nitrogen, 99.9999 % | | | Span gas, oxygen | Instrument air (20.95 % O₂) at below 1 kg/cm² | | | Span gas, trace CO | 199 ppm CO in nitrogen | 10 litre cylinder with regulator | | Mounting | Pipe mounted with a canopy, at the process | | ## Selection guidance Choose INFINITY-Tx for oxygen safety monitoring on tanks, reactors and dryers in hazardous areas. Choose ACCURRA-Hz when you need a panel analyser or ppm ranges. ## Applications Application pages where this is part of the recommended solution: - [Nitrogen blanketing and inerting](https://www.sarveshanalytics.com/applications/nitrogen-blanketing-and-inerting.html) - [Reactors, hydrogenation and polymerisation](https://www.sarveshanalytics.com/applications/chemical-reactor-hydrogenation-trace-oxygen.html) - [Closed-loop dryers and spray dryers](https://www.sarveshanalytics.com/applications/closed-loop-and-spray-dryer-oxygen-safety.html) ## Compatible products [ ### ACCURRA-Hz Process gas analyser in an enclosure certified for Gas Group IIC, Zone 1 and 2, T6. View ACCURRA-Hz ](https://www.sarveshanalytics.com/hazardous-gas-analysers.html)[ ### ACCURRA-S Online analyser for trace, percent and purity O2, CO, CO2, CH4 and dew point; can measure two gases from one sample. View ACCURRA-S ](https://www.sarveshanalytics.com/safe-gas-analyser.html)[ ### Headline filters Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection. View Headline filters ](https://www.sarveshanalytics.com/headline-filters.html) ## Frequently asked questions **Does it need a sample pump?** It is suitable for very low flow and pressure samples. Tell us the conditions. **Is it loop powered?** Yes, two-wire. **What does it measure?** Percent oxygen and trace carbon monoxide. **Where is it mounted?** Directly in the field, close to the sample point. ## Related pages - [ACCURRA-S](https://www.sarveshanalytics.com/safe-gas-analyser.html) - [ACCURRA-S oxygen analysers](https://www.sarveshanalytics.com/oxygen-gas-analyser.html) - [ACCURRA-S carbon monoxide analysers](https://www.sarveshanalytics.com/carbon-monoxide-gas-analyser.html) - [ACCURRA-S carbon dioxide analysers](https://www.sarveshanalytics.com/carbon-dioxide-gas-analyser.html) - [ACCURRA-S methane analyser](https://www.sarveshanalytics.com/methane-gas-analyser.html) - [ACCURRA-S M015 moisture analyser](https://www.sarveshanalytics.com/trace-moisture-analyser.html) - [ACCURRA-Hz](https://www.sarveshanalytics.com/hazardous-gas-analysers.html) - [Hazardous-area oxygen analyser](https://www.sarveshanalytics.com/hazardous-oxygen-analyser.html) - [Hazardous-area hydrogen analyser](https://www.sarveshanalytics.com/hazardous-hydrogen-gas-analyser.html) - [Hazardous-area moisture analyser](https://www.sarveshanalytics.com/hazardous-moisture-analyser.html) - [ACCURRA-Zr](https://www.sarveshanalytics.com/flue-gas-analysers.html) - [ACCURRA model numbers](https://www.sarveshanalytics.com/accurra-model-numbers.html) - [**Browse all gas analysers**](https://www.sarveshanalytics.com/gas-analyser.html)