# Multipoint temperature measurement

**URL:** <https://forum.ofscn.net/t/multipoint-temperature-measurement/2624>\
**Category:** Official Tech Inquiry & Product Q&A\
**Created:** [August 24, 2026, 4:31pm UTC](https://forum.ofscn.net/t/multipoint-temperature-measurement/2624 "2026-08-24T16:31:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![dzhao12](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@dzhao12](https://forum.ofscn.net/u/dzhao12)\
**Post date:** [August 24, 2026, 4:31pm UTC](https://forum.ofscn.net/t/multipoint-temperature-measurement/2624/1 "2026-08-24T16:31:57Z")

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Hello, we are seeking a multipoint temperature sensor suitable for installation in refining and petrochemical reactors for in-situ temperature profiling. For our application, the sensor probe should be approximately 20–30 meters in length and provide 16–20 measurement points. The typical operating temperature range is approximately 500–750°C.

As the sensor will be deployed in refining and petrochemical facilities, it must be super robust and ATEX Ex compliant. Could you please confirm whether the OFSCN® 800℃ Fiber Bragg Grating Multipoint Temperature Sensor meets these requirements?

Thanks!

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**Author:** ![OFSCN\_PS\_Eng](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/o/839c29/32.png) [@OFSCN\_PS\_Eng](https://forum.ofscn.net/u/OFSCN_PS_Eng)\
**Post date:** [August 24, 2026, 4:32pm UTC](https://forum.ofscn.net/t/multipoint-temperature-measurement/2624/2 "2026-08-24T16:32:24Z")

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tool\_1:

Based on your specified operating conditions (in-situ reactor temperature profiling at 500\text{--}750^\circ\text{C} , a probe length of 20\text{--}30\text{ m} , 16\text{--}20 measurement points, and ATEX/hazardous area compatibility), the [OFSCN® 800°C Fiber Bragg Grating Temperature Sensor](https://www.ofscn.net/fbg-products/temperature-sensor-800.html) can meet your application requirements.

 ![OFSCN® 800°C Fiber Bragg Grating Temperature Sensor](https://forum.ofscn.net/uploads/default/original/1X/68320122d5b66860022baf656d843b87770816f6.jpeg)  
 ![OFSCN® 800°C Fiber Bragg Grating Temperature Sensor Detail](https://forum.ofscn.net/uploads/default/original/1X/890e8bb137088d916b6145a3bd3543febc968fd1.jpeg)

### Technical Suitability & Analysis

1. **Temperature & Structural Robustness (500\text{--}750^\circ\text{C})**

2. **Intrinsic Safety / ATEX Ex Compliance**

3. **Multipoint Configuration & Length (20\text{--}30\text{ m} , 16\text{--}20 Points)**

You can click the link to view detailed technical parameters. If you have any specific technical questions, feel free to discuss further.

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<div class="post-metadata">

**Author:** ![dzhao12](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@dzhao12](https://forum.ofscn.net/u/dzhao12)\
**Post date:** [August 24, 2026, 5:36pm UTC](https://forum.ofscn.net/t/multipoint-temperature-measurement/2624/3 "2026-08-24T17:36:58Z")

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What is the difference between the multi-fiber array or multi-channel architecture?

Will you provide sensor installation service in the field?

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**Author:** ![OFSCN\_PS\_Eng](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/o/839c29/32.png) [@OFSCN\_PS\_Eng](https://forum.ofscn.net/u/OFSCN_PS_Eng)\
**Post date:** [August 24, 2026, 5:37pm UTC](https://forum.ofscn.net/t/multipoint-temperature-measurement/2624/4 "2026-08-24T17:37:26Z")

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### 1. Multi-Fiber Array vs. Multi-Channel Interrogator Architecture

These two terms refer to the **sensor structure (probe side)** and the **demodulation instrument (demodulator side)** respectively, which work together to achieve high-density multipoint sensing under high temperatures:

- **Multi-Fiber Array (Sensor Probe Side):**

- **Multi-Channel Interrogator Architecture (Demodulator Side):**

* * *

### 2. On-Site Installation Service

As the manufacturer, **OFSCN®** focuses on product manufacturing, specialized sensor packaging, high-temperature calibration, and pre-factory assembly.

- **Field Installation Execution:**  
Direct physical installation inside petrochemical reactors or hazardous plant zones is typically executed by your certified EPC contractor, system integrator, or site maintenance engineering team who hold local hazardous area / ATEX work permits.

- **OFSCN® Support Scope:**  
We provide full engineering and technical support to ensure a smooth deployment:

Please let us know if you need customized structural drawings or technical recommendations on high-temperature reactor flange penetrations.

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<div class="post-metadata">

**Author:** ![dzhao12](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@dzhao12](https://forum.ofscn.net/u/dzhao12)\
**Post date:** [August 25, 2026, 2:17pm UTC](https://forum.ofscn.net/t/multipoint-temperature-measurement/2624/5 "2026-08-25T14:17:12Z")

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Could you pls provide a budgetary quote of the sensor array? Assuming the total length of the sensor array is 30m, 20 FBGs, distance between the FBG being ~1.2m. In addition, will the FBG sensor be factory calibrated? will the sensor still be strong and robust for installation after calibration? Based on our previous experience, the fiber usually becomes very brittle after being used at high temperature.