--- title: Online Trace Moisture / Dew Point Analyser url: https://www.sarveshanalytics.com/trace-moisture-analyser.html description: ACCURRA-S M015 ceramic-sensor moisture analyser, -80 to +20 deg C dew point, reads in dew point or ppm. updated: 2026-11-03 source: html --- ACCURRA-S model M015 # Online trace moisture and dew point analyser, minus 80 to plus 20 C ACCURRA-S M015 measures trace moisture with a ceramic sensor, from minus 80 to plus 20 C dew point, with accuracy of plus or minus 2 C and repeatability of 1 C. It reads in dew point or ppm. - 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 M015 is an online trace moisture analyser with a ceramic sensor, reading minus 80 to plus 20 C dew point to plus or minus 2 C, or ppm. Check the calibration approach with Sarvesh before ordering, as field calibration of dew point is limited. Updated 3 November 2026 · Figures from Sarvesh datasheets ## Specifications | Item | Specification | Notes | |---|---|---| | Range | -80 to +20 C dew point | Ceramic sensor; minimum range -80 to 0 C dp | | Resolution | 1 C dp | | | Accuracy | +/- 2 C dp | | | Repeatability | 1 C dp | | | Response | T90 about 2 min dry to wet at 5 LPM | | | Options | Sensor bypass valve supplied; no auto-calibration; no internal sample pump | Field calibration is not possible on M015 | 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 - Reads in dew point or ppm - Dual-channel with 3015 trace oxygen in one enclosure - Alarm relays, 4-20 mA and Modbus like the rest of ACCURRA-S ## How it works Moisture is the hardest of the common impurities to measure at trace level, because water clings to surfaces and slows the reading. The ceramic sensor in M015 works across a very wide dew point range, and the sensor bypass valve isolates it during start-up, line purging or when the sample is much wetter than normal, so it recovers quickly. Dew point is the natural unit for dry gases. Minus 60 C is roughly 10 ppm of water vapour at atmospheric pressure, and each 10 degrees lower is roughly three times drier. ## Requirements and limits - Safe-area analyser. - Field calibration is not possible on M015; ask us how the sensor is checked and recalibrated. ## 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 | | | Sample at the analyser | 2 to 10 psig, 5 to 45 °C, dust below 3 micron | Response is quoted at 5 LPM | | Mounting | 19 inch rack or panel, in a safe area | | ## Selection guidance Choose M015 for nitrogen, argon, helium, oxygen and CO2 supply lines, dryers, furnace atmospheres and product hydrogen. For hazardous areas see the hazardous-area moisture analyser page. ## Applications Application pages where this is part of the recommended solution: - [Dew point and trace moisture in process gases](https://www.sarveshanalytics.com/applications/dew-point-and-trace-moisture-in-process-gases.html) - [Nitrogen purity and trace oxygen](https://www.sarveshanalytics.com/applications/nitrogen-purity-trace-oxygen.html) - [Electrolyser safety and quality](https://www.sarveshanalytics.com/applications/hydrogen-electrolyser-gas-analysis.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 [ ### 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)[ ### 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)[ ### 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 **What is the range?** Minus 80 to plus 20 C dew point. **How fast is the response?** About 2 minutes dry to wet at 5 LPM. **Can I read oxygen and moisture together?** Yes, as the dual-channel 3015 plus M015. **Can I calibrate dew point on site?** No. Field calibration is not possible on M015; ask us how the sensor is checked and recalibrated. ## 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-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)