OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade

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£31.49 (Inc. VAT)
£26.24 (Ex. VAT)
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OWC In-line Digital Thermal Sensor for 27-inch & 21.5-inch iMac (2011). Required to upgrade the Hard Drive your iMac with any SATA drive

  • Required for any drive installed into the main drive bay.
  • Eliminate fan noise and maintain correct system fan control when upgrading your 2011 iMac.
  • The only iMac HDD upgrade option on the market certified to pass the Apple Hardware Test.
  • Fixes firmware incompatibility issues with third party hard drives.
  • Engineered in-house and backed by OWC's award-winning customer support.

Improve Performance and Capacity. Upgrade Your iMac with Confidence.
OWC's in-line solution is the only hardware digital thermal sensor on the market allowing a third-party SATA drive to be installed in your iMac. A convenient, plug-and-play cable, the In-line Digital Thermal Sensor eliminates fan noise and maintains proper system fan control through the iMac's System Management Controller. This innovative device is designed specifically for the iMac, requires no software hacks and ensures compatibility with Apple's built-in diagnostic processes.

Note: Before attempting to perform this installation, please watch the OWC Install Videos below to determine your ability to perform this complex upgrade.

OWC assumes no responsibility for damage that may occur during the install. Technical support for this DIY product consists only of the OWC Install Video.

While OWC encourages the DIY philosophy, this is a very difficult upgrade that requires advanced skills. If you are not fully confident in your ability to upgrade the drive in your 2011 iMac after watching the OWC Install Video, you should visit local Apple certified repair shop.

This item does not include installation tools.


OWC In-line Digital Thermal Sensor Cable
1 Year OWC Brand Standard Limited Warranty


iMac (21.5-inch Late 2011) (August, 2011) Model ID: iMac12,1 - A1311 - EMC - 2428 | 3.1GHz i3
iMac (21.5-inch Mid 2011) (May, 2011) Model ID: iMac12,1 - A1311 - EMC - 2428 | 2.5GHz i5, 2.7GHz i5, 2.8GHz i7
iMac (27-inch Mid 2011) (May, 2011) Model ID: iMac12,2 - A1312 - EMC - 2429 | 2.7GHz i5, 3.1GHz i5, 3.4GHz


  • 5

    Just the job

    Posted by Brian on 9th Jun 2020

    Perfect and easy to fit

  • 3

    iMac thermal sensor

    Posted by Xavier on 4th May 2020

    Seems to work as it should in my mid 2011 27" iMac with no fan issues so far. I changed the original hard drive for an internal SSD attaching the sensor directly to the SSD case (close to connectors). All very simple but seems pretty expensive for what it is.

  • 5

    Great Service

    Posted by Brendan on 6th Sep 2019

    Part was dispatched 5mins after I placed the order, and delivered next day. Service was A* and happy to be a repeat customer

  • 5

    OWC in-line temperature sensor for 2011 iMac

    Posted by Andrew Barton on 14th Aug 2019

    The sensor was fairly easy to install and worked without any trouble

  • 5


    Posted by Trudy Martindale on 23rd Jan 2019

    Worked a treat and delivery was first class A*