# Differential Temperature Positioning for Level Measurement

**URL:** <https://forum.ofscn.net/t/differential-temperature-positioning-for-level-measurement/487>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology\
**Created:** [January 26, 2026, 6:47am UTC](https://forum.ofscn.net/t/differential-temperature-positioning-for-level-measurement/487 "2026-01-26T06:47:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![frostweaver](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/f/da6949/32.png) [@frostweaver](https://forum.ofscn.net/u/frostweaver)\
**Post date:** [January 26, 2026, 6:47am UTC](https://forum.ofscn.net/t/differential-temperature-positioning-for-level-measurement/487/1 "2026-01-26T06:47:53Z")

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If there is no temperature gradient across the liquid surface, can the sensor still work? What auxiliary heating methods are available?

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [January 26, 2026, 6:48am UTC](https://forum.ofscn.net/t/differential-temperature-positioning-for-level-measurement/487/2 "2026-01-26T06:48:00Z")

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The [OFSCN® Fiber Bragg Grating Liquid Level Sensor](https://www.ofscn.net/fbg-products/liquid-level.html) relies on a significant temperature difference between the liquid below the surface and the gas above the surface to function. Therefore, if there is no temperature gradient across the liquid surface, the sensor cannot effectively determine the liquid level.

The working principle of this sensor is based on utilizing multiple Fiber Bragg Grating (FBG) temperature sensors as a reference scale. These sensors detect the distinct temperature profiles to locate the liquid surface. Without a clear temperature differential, this positioning method is not applicable.

Below are images illustrating the sensor:

 ![OFSCN FBG Liquid Level Sensor](https://forum.ofscn.net/uploads/default/original/1X/1250fd61302a58f79f01464fc13b994cc00bce61.jpeg)

You can find more detailed technical parameters on our website:  
[OFSCN® Fiber Bragg Grating Liquid Level Sensor](https://www.ofscn.net/fbg-products/liquid-level.html)