--- title: Maintenance Schedule and Spares for Gas Analysers url: https://www.sarveshanalytics.com/learn/maintenance-schedule-and-spares-for-gas-analysers.html description: A practical maintenance schedule for online gas analysers: daily, weekly, monthly and annual tasks, which spares to hold, and how to keep a maintenance log. updated: 2026-11-03 source: html --- Learn · Calibration and maintenance # Maintenance schedule and spares for gas analysers Most analyser downtime is preventable and starts in the sample system. A short schedule and a few spares remove most of it. Intermediate 3 min read Lesson 6 of 8[Calibration and maintenance](https://www.sarveshanalytics.com/learn/track-calibration-and-maintenance.html) Helpful first: [Troubleshooting gas analyser readings: high, low, noisy, slow](https://www.sarveshanalytics.com/learn/troubleshooting-gas-analyser-readings.html) Quick answer Maintain analysers by routine: a daily look at flow, pressure and condensate; a weekly check of filters and drain; a monthly calibration check; and an annual full calibration, sensor check and leak test. Keep spare filter elements, tubing fittings, a sensor or cell and a few seals. Log every action so that trends and repeat faults are visible. Updated 3 November 2026 · Figures from Sarvesh datasheets **After this lesson you can** - Build a maintenance routine by frequency - Select spares to hold - Keep a useful log ## A starting schedule | Interval | Tasks | |---|---| | Daily or each shift | Look at the display, flow, pressure and any alarms; check the condensate drain and cooler status | | Weekly | Inspect filters and the rotameter; check calibration gas pressure; look for leaks or moisture in the sample line | | Monthly | Calibration check with zero and span, recording the as-found deviation; clean or replace filter elements as needed | | Quarterly | Check heated lines and probe condition, blowback operation and cooler performance | | Annually | Full calibration, leak test of the sample system, sensor and cell review, check of alarms and outputs, review of the maintenance log | These are starting points. Lengthen or shorten each from your own records: [How often should you calibrate a gas analyser](https://www.sarveshanalytics.com/learn/how-often-to-calibrate-a-gas-analyser.html). ## Spares to hold - Filter elements for each filter in the sample line. - Tubing, ferrules and fittings of the same material as installed. - A spare sensor or cell for critical analysers, particularly electrochemical cells with a limited life: [Sensor life, poisoning and replacement in gas analysers](https://www.sarveshanalytics.com/learn/sensor-life-poisoning-and-replacement.html). - Pump diaphragms or a spare pump where one is used, and seals. - Calibration gas, regulators and the connectors to use them. - Fuses and any items the manual lists as consumables. Stock to match the criticality: a safety interlock analyser deserves a spare sensor on the shelf. ## The log - Date, who, what was done. - As-found and as-left calibration values and the gas lot. - Flow and pressure at the inlet. - Parts replaced and their lot or date. - Any faults and the actions taken. A log shows when a part fails early, when drift is growing and when an interval can be extended. ## Training and support A trained technician is the best maintenance tool. Operators should know what each alarm means and when to call. For a plant starting out, ask about service and training from the supplier. **In short** - Run a daily, weekly, monthly and annual routine. - Hold spare filters, fittings, sensors and calibration gas. - Log as-found values, flow, pressure and parts. - Adjust intervals from data. ## Check your understanding Answer in your head or on paper first, then open the answer. Recalling an answer teaches more than rereading. **Which two checks belong in a daily routine?** Flow and pressure, and the condensate drain and cooler. **Why keep a spare sensor?** A critical analyser should not be down while waiting for a sensor to arrive. **What does a log let you do?** See trends, repeat faults and decide when to lengthen or shorten intervals. ## Key terms - [Calibration](https://www.sarveshanalytics.com/learn/glossary.html#t-calibration) - [Sensor life](https://www.sarveshanalytics.com/learn/glossary.html#t-sensor-life) - [Fine filter](https://www.sarveshanalytics.com/learn/glossary.html#t-fine-filter) - [Condensate](https://www.sarveshanalytics.com/learn/glossary.html#t-condensate) ## Frequently asked questions **How often should an analyser be serviced?** A routine of daily, weekly, monthly and annual tasks, adjusted from your records. **Which spares are essential?** Filter elements, fittings, calibration gas and, for critical analysers, a spare sensor. **Can Sarvesh service my analyser?** Contact us with the model and site; support is part of how we work. **Who should maintain analysers?** Trained instrument technicians following the manual. ## Related 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)[ ### 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) ## Where this applies - [Gas purity certification and cylinder filling](https://www.sarveshanalytics.com/applications/gas-purity-certification-and-cylinder-filling.html) ## Where to go next - [Records, audit trails and qualification for regulated plants](https://www.sarveshanalytics.com/learn/records-audit-trails-and-qualification-for-regulated-plants.html)