# Analytical Instruments **URL:** https://forumautomation.com/c/field-instrumentation/analytical-instruments/41.md?page=1 [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) **Page:** 2 --- ## [What is the Range of the pH Transmitter?](https://forumautomation.com/t/what-is-the-range-of-the-ph-transmitter/11884)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [March 21, 2024, 4:55am UTC](https://forumautomation.com/t/what-is-the-range-of-the-ph-transmitter/11884 "2024-03-21T04:55:35Z")
What is the Range of the pH Transmitter? The pH levels that a pH transmitter can reliably measure and communicate are usually referred to as its range. To determine a solution’s acidity or alkalinity, pH transmitters… --- ## [What is the accuracy difference between gas chromatography and mass spectrometry instruments? Which one is more accurate and why?](https://forumautomation.com/t/what-is-the-accuracy-difference-between-gas-chromatography-and-mass-spectrometry-instruments-which-one-is-more-accurate-and-why/12600)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [September 26, 2024, 11:45am UTC](https://forumautomation.com/t/what-is-the-accuracy-difference-between-gas-chromatography-and-mass-spectrometry-instruments-which-one-is-more-accurate-and-why/12600 "2024-09-26T11:45:18Z")
What is the accuracy difference between gas chromatography and mass spectrometry instruments? Which one is more accurate and why? --- ## [What is an infrared analyzer?](https://forumautomation.com/t/what-is-an-infrared-analyzer/14042)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [April 24, 2026, 2:16pm UTC](https://forumautomation.com/t/what-is-an-infrared-analyzer/14042 "2026-04-24T14:16:06Z")
What is an infrared analyzer? --- ## [What is the principle of CO analyzer?](https://forumautomation.com/t/what-is-the-principle-of-co-analyzer/14024)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [April 24, 2026, 2:17pm UTC](https://forumautomation.com/t/what-is-the-principle-of-co-analyzer/14024 "2026-04-24T14:17:08Z")
What is the principle of CO analyzer? --- ## [Can a combustion analyzer detect carbon monoxide?](https://forumautomation.com/t/can-a-combustion-analyzer-detect-carbon-monoxide/14021)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [April 17, 2026, 1:36pm UTC](https://forumautomation.com/t/can-a-combustion-analyzer-detect-carbon-monoxide/14021 "2026-04-17T13:36:37Z")
\*Can a combustion analyzer detect carbon monoxide? --- ## [How does a H2S Analyser work?](https://forumautomation.com/t/how-does-a-h2s-analyser-work/14244)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 23, 2026, 4:31am UTC](https://forumautomation.com/t/how-does-a-h2s-analyser-work/14244 "2026-07-23T04:31:19Z")
How does a H2S Analyser work? --- ## [What is the full form of Tdls analyzer?](https://forumautomation.com/t/what-is-the-full-form-of-tdls-analyzer/14101)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 21, 2026, 10:00am UTC](https://forumautomation.com/t/what-is-the-full-form-of-tdls-analyzer/14101 "2026-05-21T10:00:27Z")
What is the full form of Tdls analyzer? --- ## [What causes false high vibration alarms in vibration transmitters after grounding or shielding changes?](https://forumautomation.com/t/what-causes-false-high-vibration-alarms-in-vibration-transmitters-after-grounding-or-shielding-changes/14159)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 13, 2026, 6:35am UTC](https://forumautomation.com/t/what-causes-false-high-vibration-alarms-in-vibration-transmitters-after-grounding-or-shielding-changes/14159 "2026-06-13T06:35:46Z")
What causes false high vibration alarms in vibration transmitters after grounding or shielding changes? --- ## [What is the key difference between LEL and uel?](https://forumautomation.com/t/what-is-the-key-difference-between-lel-and-uel/14246)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 10, 2026, 7:59am UTC](https://forumautomation.com/t/what-is-the-key-difference-between-lel-and-uel/14246 "2026-07-10T07:59:23Z")
What is the key difference between LEL and uel? --- ## [Online pH Analyzer Shows 4.3 While Laboratory Measurement Shows 6.9](https://forumautomation.com/t/online-ph-analyzer-shows-4-3-while-laboratory-measurement-shows-6-9/14319)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [August 13, 2026, 4:25pm UTC](https://forumautomation.com/t/online-ph-analyzer-shows-4-3-while-laboratory-measurement-shows-6-9/14319 "2026-08-13T16:25:45Z")
Online pH Analyzer Shows 4.3 While Laboratory Measurement Shows 6.9 A wastewater tank normally operates at pH 7.0. The online pH analyzer suddenly indicates 4.3, while laboratory testing shows 6.9. The transmitter output… [Previous page](https://forumautomation.com/c/field-instrumentation/analytical-instruments/41.md?per_page=50)