Temperature Distribution / Free Lead Wires

Temperature Distribution / Free Lead Wires

Temperature Distribution (TD) lead wires (also referred to as "Free Leads") are used to measure the temperature of the retort heating medium OUTSIDE the product-filled containers. TD/Free Lead Wires connect the sensing tip of the wire to the CALPlex Datalogger in a Temperature Distribution or Heat Penetration test. The Lead Wire consists of three components: The wire (made from specially selected, oxygen-free, copper-constantan “type T” alloys), the end that senses retort temperature, and the CALPlex datalogger end. The wires are made to a specified length, depending on your retort configuration. For a Temperature Distribution test, we recommend 32 wires. For a Heat Penetration test, we recommend at least 2 Free Leads. You can customize your set of wires below.

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WIRE TYPES

Grouped Content
20 Gauge Solid Wire
(#TEF-20) Two Solid wires, copper constantan Type, each is 20 gauge, Brown colored Teflon overwrap protects the wires.
22 Gauge Stranded Wire
(#TEF-22-S) Two Stranded wires, copper constantan Type, each is 22 gauge, Clear Teflon overwrap protects the wires.
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Splitting Wires to Prevent CALPlex Water Damage

When testing with a wired data collection system in a water retort, there can sometimes be an issue where the pressure inside the retort forces water through the lead wire insulation, and can even reach the CALPlex (which may affect performance). To eliminate this, we recommend that you cut away the exterior insulation and "split" or separate the red and blue wires from each other. This allows the water to drip out and exit before it reaches the CALPlex. For a video and setp-by-step walkthrough on how to split your wires, click the image below.

Wire Splitting Video

 

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How To Determine Length of Wires

To determine the length of your temperature distribution wires, we suggest considering the size of the retort you will be using for testing as well as the location of the packing gland installed on the retort.

 

 

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Questions?

If you have any questions about how to design or size your heat penetration wires, please contact us at:

Email:  [email protected]

PHONE:  504-733-0300