# pH probes / monitoring

**URL:** <https://forum.pioreactor.com/t/ph-probes-monitoring/178>\
**Category:** Hardware, PWM, and Optics\
**Tags:** plugin\
**Created:** [November 17, 2023, 12:18am UTC](https://forum.pioreactor.com/t/ph-probes-monitoring/178 "2023-11-17T00:18:50Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![CamDavidsonPilon](https://forum.pioreactor.com/user_avatar/forum.pioreactor.com/camdavidsonpilon/32/3_2.png) [@CamDavidsonPilon](https://forum.pioreactor.com/u/CamDavidsonPilon)\
**Post date:** [April 8, 2024, 1:54am UTC](https://forum.pioreactor.com/t/ph-probes-monitoring/178/10 "2024-04-08T01:54:54Z")

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Hm, I just found this probe: [Orion™ Economy Series pH Combination Electrodes](https://www.thermofisher.com/order/catalog/product/911600)

The diameter is 6mm, which I believe would fit into the vial cap A’s port, and the price is _reasonable_ (I know I know). It has a BNC connector, and can integrate with the EZO pH system¹:

- [https://atlas-scientific.com/electrical-isolation/i3-interlink/](https://atlas-scientific.com/electrical-isolation/i3-interlink/)
- [EZO™ pH Circuit | Atlas Scientific](https://atlas-scientific.com/embedded-solutions/ezo-ph-circuit/)

I’m currently writing some software to incorporate the latter into the Pioreactor: [[wip] Integrating pH / DO probes (software only) · Issue #483 · Pioreactor/pioreactor · GitHub](https://github.com/Pioreactor/pioreactor/issues/483)

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This came from this paper: [https://www.biorxiv.org/content/10.1101/2024.03.03.582641v1.full.pdf](https://www.biorxiv.org/content/10.1101/2024.03.03.582641v1.full.pdf)

¹I’m kinda confused about the connector though. The probe has a BNC connector, while the EZO has an SMA connector. I think you need a BNC to SMA connector.

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