---
title: Gas Analyser Calibration and Maintenance
url: https://www.sarveshanalytics.com/learn/track-calibration-and-maintenance.html
description: How calibration works, choosing and handling calibration gas, how often to calibrate, auto-calibration, troubleshooting, maintenance, sensor life and records.
updated: 2026-11-03
source: html
---

Learn · Track 5 of 8

# Calibration and maintenance

Keeping the reading true: calibration, validation, troubleshooting, spares and records.

 8 lessons About 25 min

## What this track covers

An analyser that was right on the day it was installed is not automatically right a year later. This track explains what calibration really does, which gases to use, how often to check, how to diagnose a reading that looks wrong and how to keep the records a quality system expects.

## Lessons, in order

1. [  **How gas analyser calibration works: zero and span** Calibration compares the analyser's reading with a gas of known concentration and adjusts it to match.  Beginner*4 min*](https://www.sarveshanalytics.com/learn/how-gas-analyser-calibration-works.html)
2. [  **Calibration gases: choosing, handling and certificates** Choose span gas near 70 to 90 % of the range in a balance gas that matches the sample, with a certificate stating concentration, uncertainty and expiry.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/calibration-gases-choosing-and-handling.html)
3. [  **How often should you calibrate a gas analyser?** Set the interval from three things: how much error the process can tolerate, how fast the analyser drifts, and what a wrong reading costs.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/how-often-to-calibrate-a-gas-analyser.html)
4. [  **Auto-Calibration and validation checks for gas analysers** Auto-calibration switches zero and span gas to the analyser by solenoid valves on a timer, keypad or Modbus command, and adjusts or records the result.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/auto-calibration-and-validation-checks.html)
5. [  **Troubleshooting gas analyser readings: high, low, noisy, slow** Apply known gas at the analyser inlet.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/troubleshooting-gas-analyser-readings.html)
6. [  **Maintenance schedule and spares for gas analysers** 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.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/maintenance-schedule-and-spares-for-gas-analysers.html)
7. [  **Sensor life, poisoning and replacement in gas analysers** Electrochemical cells are consumed by the gas they measure and last months to years depending on exposure.  Intermediate*3 min*](https://www.sarveshanalytics.com/learn/sensor-life-poisoning-and-replacement.html)
8. [  **Records, audit trails and qualification for regulated plants** Regulated plants must show that an analyser was fit for purpose and stayed so: traceable calibration records, alarm and fault history, controlled access to settings, change control, and documented qualification (installation, operation and performance).  Advanced*3 min*](https://www.sarveshanalytics.com/learn/records-audit-trails-and-qualification-for-regulated-plants.html)

Next track: [Safety and hazardous areas](https://www.sarveshanalytics.com/learn/track-safety.html)