--- title: ACCURRA-S Safe Area Gas Analyser | Sarvesh url: https://www.sarveshanalytics.com/safe-gas-analyser.html description: ACCURRA-S online gas analyser for O2, CO, CO2, CH4 and moisture. Made in Pune since 2007. Dual-channel option, Modbus, 4-20 mA. updated: 2026-11-03 source: html --- Safe area analyser · Made in Pune since 2007 # ACCURRA-S online gas analyser for O2, CO, CO2, CH4 and moisture Trace, percent and purity measurement on one 19-inch platform, with each gas matched to the sensor that suits its range. Two gases can share one enclosure, each with its own electronics, output and Modbus ID. - 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 ACCURRA-S is Sarvesh's safe-area online gas analyser for oxygen, CO, CO2, methane and moisture, from ppm to 100 %. It has a 4-20 mA output, failsafe relays and Modbus, and expects a dry, non-corrosive, non-toxic, non-flammable sample at 2 to 10 psig. Updated 3 November 2026 · Figures from Sarvesh datasheets ## Why ACCURRA-S ### Accurate from ppm to purity Trace oxygen to 1 % of reading ±2 ppm; purity oxygen compensated for ambient pressure and temperature, which keeps error below 0.5 %. ### Integrates without add-ons Dual-range isolated 4–20 mA with range ID relay, six failsafe relays, Modbus RTU and output freeze during calibration come as standard. ### Maintenance you can plan Time-stamped calibration, alarm and fault history shows drift and residual sensor life, so consumable sensors are replaced on schedule. ## Specifications | Item | Specification | Notes | |---|---|---| | Display | Backlit LCD, 4 lines x 20 characters | | | Analog output | 1 x 4-20 mA isolated, max load 500 ohm, dual range | Range freely selectable over the full measurement range | | Relays | 6 x SPST rated 1 A 230 V AC, all failsafe | Alarm 1, Alarm 2, fault, sample pump or range ID, two for auto-calibration valves | | Communication | Modbus RTU over RS 485 | Read measured value, status, set-up and history; write auto-calibration | | Enclosure | 19 inch rack or panel; 134 H x 483 W x 180 (short) or 280 (long) D mm | IP 20, safe area only; net about 6 kg, gross about 8 kg | | Power | 100 to 240 V AC, 50/60 Hz, 45 W | | | Inlet and outlet | 1/4 inch OD SS316 | | | Ambient | 5 to 40 C; below 90 % RH non-condensing | Storage 0 to 50 C | 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. ## Models and ranges | Model | Measures | Range | Sensor | Notes | |---|---|---|---|---| | 3015 | Oxygen, trace | 0 to 1000 ppm (min 0 to 100 ppm) | Electrochemical | Sensor life above 18 months; sensor bypass valve supplied | | 3030 | Oxygen, percentage | 0 to 25 % (min 0 to 5 %) | Electrochemical | Sensor life above 2 years | | 3090 | Oxygen, purity | 0 to 100 % (min 0 to 5 %) | Electrochemical, ambient pressure and temperature compensated | Sensor life above 2 years | | 3130 | Oxygen, percentage | 0 to 100 % (min 0 to 5 %) | Paramagnetic | No consumable sensor; no internal sample pump | | 3190 | Oxygen, purity | 95 to 100 % | Paramagnetic, ambient pressure and temperature compensated | No consumable sensor; no internal sample pump | | 2015 | Carbon monoxide | 0 to 1000 ppm (min 0 to 100 ppm) | Electrochemical cell | Sensor life above 2 years | | 2030 | Carbon monoxide | 0 to 100 % (min 0 to 5 %) | NDIR | Sensor life above 5 years | | 6015 | Carbon dioxide | 0 to 5000 ppm (min 0 to 100 ppm) | NDIR | Sensor life above 5 years | | 6030 | Carbon dioxide | 0 to 20 % or 0 to 100 % (min 0 to 5 %) | NDIR | Sensor life above 5 years | | 4030 | Methane | 0 to 100 % (min 0 to 5 %) | NDIR | Sensor life above 5 years | | M015 | Moisture / dew point | -80 to +20 C dp (min -80 to 0 C dp) | Ceramic sensor | Sensor bypass valve supplied; field calibration not possible | ## Performance by model | Model | Range and resolution | Intrinsic error (accuracy) | Repeatability | Response T90 | |---|---|---|---|---| | 3015 | 0 to 1000 ppm, resolution 0.1 ppm | 1 % of reading +/- 2 ppm | Zero +/- 2 ppm; span 1 % of reading | Below 30 s | | 3030 | 0 to 25 %, resolution 0.01 % | +/- 0.01 % of FS | +/- 0.04 % | Below 20 s | | 3090 | 0 to 100 %, resolution 0.01 % | +/- 0.1 % of FS | +/- 0.5 % | Below 20 s | | 3130 | 0 to 100 %, resolution 0.01 % | +/- 0.1 % of FS | +/- 0.1 % of FS | Below 5 s | | 3190 | 95 to 100 %, resolution 0.01 % | +/- 0.5 % of FS | +/- 0.5 % of FS | Below 5 s | | M015 | -80 to +20 C dp, resolution 1 C | +/- 2 C dp | 1 C dp | 2 min at 5 LPM, dry to wet | | 2015 | 0 to 1000 ppm, resolution 0.1 ppm | 1 % of FS | Zero +/- 2 ppm; span +/- 10 ppm | Below 30 s | | 2030 | 0 to 100 %, resolution 0.01 % | 2 % of FS | 2 % of reading | Below 30 s | | 6015 | 0 to 5000 ppm, resolution 0.1 ppm | 1 % of FS | Zero +/- 10 ppm; span +/- 50 ppm | Below 60 s | | 6030 | 0 to 20 % or 0 to 100 %, resolution 0.01 % | +/- 1 % of FS | +/- 0.05 % | Below 60 s | | 4030 | 0 to 100 %, resolution 0.01 % | 2 % of FS | 2 % of reading | Below 45 s | ## Key features - Dual-channel: two different sensors in series, each with its own electronics, current output, relays and Modbus ID - Two independent failsafe alarm relays, configured as Lo-LoLo, Lo-Hi or Hi-HiHi - Dual-range 4-20 mA output with a range ID relay, useful when start-up readings are high - Output freeze: outputs hold their last value during calibration check, calibration and auto-calibration - Sensor bypass valve on trace oxygen and dew point models, to isolate the sensor during purging or upsets - Optional internal solenoid valves for auto-calibration, started from the keypad, a cyclic timer or Modbus - Calibration, alarm and fault history; last calibration with deviation values supports audits - Password-protected calibration, set-up and diagnostics; built-in hardware diagnostic mode ## How it works Each ACCURRA-S sensor has its own electronics and microcontroller, which makes the hardware independent. A dual-channel unit houses two sensors in series, with common pneumatics, so you measure two gas components in one sample with separate outputs, relays and Modbus addresses. A fault in one channel does not stop the other. The analyser is designed to be easy to integrate: an internal fine filter of glass micro fibre, a flow indicator and, on trace oxygen and dew point models, a sensor bypass valve. The sample handling between your process and the analyser decides years of trouble-free performance, so the catalogue states the sample conditions that ACCURRA-S expects. ## Requirements and limits - The sample gas should be non-corrosive, non-toxic, non-flammable, non-condensing and dry, and free from entrained oil. - Sample pressure 2 to 10 psig maximum, regulated externally. Recommended flow 1 LPM. - Dust or particulate below 3 micron; the built-in fine filter handles light loads, and heavier dust needs an upstream filter. - Materials in contact with sample: SS316, Viton, PTFE, glass, aluminium and acrylic. - Sample temperature 5 to 45 C, and a sample dew point at least 5 C below the lowest ambient temperature. - Auto-calibration is not available on 3015 and M015, and on dual-gas units the calibration valves are external (relay outputs only). An internal sample pump is not available on 3015, M015, 3130, 3190 or any dual-gas unit. When the pump option is chosen, the range ID relay is unavailable. - Field calibration is not possible on the dew point model M015. - If your sample does not comply, we design a conditioning system around your application; flammable or toxic gas is reviewed case by case. ## On site: utilities and calibration gases What to have ready at your plant before installation and commissioning. | Item | Requirement | Notes | |---|---|---| | Power at the analyser | 100 to 240 V AC, 50/60 Hz, 45 W | | | Zero gas | Zero-grade nitrogen, 99.9999 % | 10 litre cylinder with regulator | | Span gas, trace oxygen | Oxygen in nitrogen near the top of the range, for example 1000 ppm | 10 litre cylinder with regulator | | Span gas, 3090 | Zero-grade oxygen; zero on zero-grade nitrogen | | | Span gas, 3190 | Zero-grade oxygen; zero on 95 % oxygen in nitrogen | | | Span gas, percent CO, CO₂ or CH₄ | Zero-grade CO, CO₂ or CH₄, 99.999 % | | | Instrument air and service nitrogen | 4 kg/cm² minimum | | | Sample at the analyser | 2 to 10 psig, about 1 LPM, 5 to 45 °C, dust below 3 micron | Pressure and flow regulated by the user | | Mounting | 19 inch rack or panel, in a safe area | | ## Options and ordering - Ordering code: first and second component gas (model numbers above); auto-calibration as none, relay output only, or internal solenoid valves; relay 4 as range ID, internal sample pump or relay for an external pump; AC power - Sample conditioning: SGI-300 cooler, i-Cons complete sampling system, SP-300 heated probe, filters, scrubbers and catchpots ## Selection guidance Choose ACCURRA-S for purity measurement, gas certification, trace impurities, process monitoring in oxygen, nitrogen, argon and CO2 plants, welding gases, fermenter off-gas and furnace atmospheres. For binary gases such as hydrogen, helium and argon, see the ACCURRA-TCD pages. For hazardous areas see ACCURRA-Hz. For percent oxygen in a flue duct see ACCURRA-Zr. ## Applications Application pages where this is part of the recommended solution: - [Oxygen purity in air separation plants](https://www.sarveshanalytics.com/applications/oxygen-purity-air-separation-plant.html) - [Nitrogen purity and trace oxygen](https://www.sarveshanalytics.com/applications/nitrogen-purity-trace-oxygen.html) - [Gas purity certification and cylinder filling](https://www.sarveshanalytics.com/applications/gas-purity-certification-and-cylinder-filling.html) - [Dew point and trace moisture in process gases](https://www.sarveshanalytics.com/applications/dew-point-and-trace-moisture-in-process-gases.html) - [Fermenter and bioreactor off-gas](https://www.sarveshanalytics.com/applications/fermenter-and-bioreactor-off-gas.html) - [Nitrogen blanketing and inerting](https://www.sarveshanalytics.com/applications/nitrogen-blanketing-and-inerting.html) - [Heat-treatment furnace atmosphere](https://www.sarveshanalytics.com/applications/heat-treatment-furnace-atmosphere.html) - [Semiconductor and electronics gas purity](https://www.sarveshanalytics.com/applications/semiconductor-and-electronics-gas-purity.html) ## Compatible products [ ### i-Cons Smart Peltier sample conditioner with diagnostics, auto blowback and Modbus, in a compact 19 inch cabinet. View i-Cons ](https://www.sarveshanalytics.com/smart-systems-for-gas-analyser.html)[ ### SGI-300 / SGI-320 Peltier sample cooler with integrated pump, filter and condensate detector; SGI-320 for emission monitoring. View SGI-300 / SGI-320 ](https://www.sarveshanalytics.com/sample-coolers.html)[ ### SP and SRP sample probes Heated and non-heated probes with blowback, and retractable probes, in SS316, Inconel or ceramic. View SP and SRP sample probes ](https://www.sarveshanalytics.com/sample-probes.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)[ ### ACCURRA-TCD Thermal conductivity analyser for binary mixtures of H2, He, Ar, N2 and others, with no reference gas. View ACCURRA-TCD ](https://www.sarveshanalytics.com/binary-tcd-thermal-conductivity-analysers.html) ## Frequently asked questions **Which gases can ACCURRA-S measure?** Oxygen, carbon monoxide, carbon dioxide, methane and moisture or dew point, in ranges from ppm to 100 percent depending on the sensor model. **Can one analyser measure two gases?** Yes. The dual-channel version houses two sensors with common pneumatics and independent outputs. See the dual-gas analyser page for the combinations. **What must the sample be like?** Non-corrosive, non-toxic, non-flammable, dry and free of oil, at 2 to 10 psig and about 1 LPM. **Is ACCURRA-S suitable for hazardous areas?** No. It is a safe-area analyser. ACCURRA-Hz is the hazardous-area version. **How does it connect to my control system?** Through an isolated 4-20 mA output with dual range, failsafe relays and Modbus RTU over RS 485. ## Related pages - [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) - [INFINITY-Tx](https://www.sarveshanalytics.com/oxygen-transmitter.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)