Thermocouples Defined

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Full Thermocouple Probe and Adapter Information


Save your self problem and pointless breakage of your gear by studying the best way to function it correctly.

Use this useful, step-by-step information to make use of your probes and glass adapters like a professional!

How To Insert a Thermocouple Probe


  1. Keep away from breaking your thermocouple adapter! Correct insertion of a thermocouple probe into a set (or non-fixed) thermocouple adapter might look like widespread sense, however these adapters can break should you’re not cautious. That is very true in case your probe is bent previous to insertion.
  2. Straighten the probe The probe needs to be straightened earlier than insertion right into a thermocouple adapter. Inserting a bent probe wall trigger undue stress on the probe, which might trigger you issues down the highway!
  3. Unscrew the cap on the adapter As soon as the probe has been straightened, now you can unscrew the Chemthread cap on the thermocouple adapter. Ensure the O-Ring is conditioned (grease could also be used) and that it’s intact!
  4. Place the Chemthread cap onto the probe Begin by inserting the Chemthread cap onto the probe, adopted by the O-Ring, and eventually by the glass adapter. The thermocouple probe ought to slide easily and simply onto the thermocouple adapter.
  5. Tighten the Chemthread cap After inserting the probe, tighten it (in place) utilizing the Chemthread cap. Do NOT over-tighten the cap! As soon as the thermocouple is sealed in opposition to the O-Ring, the probe will now not transfer up and down. If the probe is unfastened, the O-Ring could also be chilly – if so, heat it up with physique warmth or one thing comparable.  The O-Ring’s flexibility could also be examined by tightening the cap with out a probe inside and visually observing how the scale of the opening decreases when tightened.
  6. Bend the thermocouple as wanted! The thermocouple probe might now be bent to fit your wants and state of affairs.
  7. Insert the probe First, insert the stir bar by turning the boiling flask on an angle and gently inserting the stir bar into the bottom resting neck. Tilt the flask upright once more slowly, such that the stir bar sits gently on the underside. Subsequent, rigorously insert the probe and adapter into the spherical backside flask.
  8. Have to take away the probe? If you need to take away a thermocouple probe from an adapter, you need to keep in mind to straighten the bend within the probe earlier than you take away the adapter.
  9. Unscrew the Chemthread cap As soon as the thermocouple probe has been straightened, now you can unscrew the Chemthread cap utterly, releasing the glass adapter and permitting the person to take away the probe from the adapter in a clean and straightforward vogue.

Hyperlinks to merchandise on this FAQ:

Thermocouple FAQ


What’s a Thermocouple?

A thermocouple is {an electrical} gadget consisting of two dissimilar electrical conductors, forming electrical junctions at differing temperatures. A thermocouple produces a temperature-dependent voltage – which is basically a “studying” or measurement. This measurement can then be interpreted by an enter gadget reminiscent of a temperature monitor (or regulator) within the type of precise levels.

Which Thermocouple Adapter Ought to I Select?

When selecting a thermocouple adapter, it is very important know what dimension thermocouple needs to be used (widespread sizes are 1/4″ and 1/8″) and what dimension floor glass joint can be used inside (widespread sizes are 10/18, 19/22, and 24/40). The subsequent most necessary query to reply is: What sorts of supplies/merchandise will the adapter(s) be used round? For corrosive environments, PTFE or glass will do finest. For top-temperature operations (inside temperatures over 260°C), PTFE and glass adapters have the potential to fail as a result of plastic (PPE) caps or elements. Offering this info to one in all our gross sales representatives will permit us to present you a number of viable choices. We manufacture and promote varied varieties of thermocouple adapters for most typical sizes and functions.

Do thermocouple adapters leak?

Some boiling flasks have 1/8″ thermocouple adapters positioned straight on the flask to scale back connection leaks. These adapters permit for the probe to barely transfer round contained in the flask. So long as the probe can not simply transfer up and down contained in the adapter (which means the O-Ring is just not correctly seated), the connection will present an sufficient vacuum seal.

What if there’s nonetheless a leak?

When you’ve adopted the steps accurately on the high of this web page, try to be all set. If, nonetheless, you can’t correctly seat the thermocouple probe to seal contained in the adapter (e.g. the probe strikes up and down loosely), the next steps needs to be adopted:

1. Separate the elements of the adapter and examine the Viton O-Ring that compresses beneath the compression cap. If the Viton O-Ring is broken, it might require substitute.

2. If the O-Ring experiences extreme publicity to alcohol, it should degrade and will require substitute.

3. If the O-Ring is extraordinarily laborious and never malleable, it might require some manipulation through slight warmth (to enhance elasticity) and even slight lubrication (you should utilize a small quantity of vacuum grease for this).

4. After guaranteeing that the O-Ring is phenomenal and malleable, place it on high of the glass becoming, adopted by the black (PPE) or tan (PEEK) cap, and start screwing the cap into place.

5. As soon as the cap stops turning, it has met the O-Ring. You need to now peer by way of the opening within the cap to make sure that the O-Ring is certainly seated correctly in opposition to the cap and glass.

6. Whereas wanting by way of the cap’s aperture, start tightening the cap, observing the O-Ring’s aperture shrinking all the way down to smaller diameters.

7. Frivolously try and push the thermocouple probe contained in the adapter with the cap tightened – it mustn’t permit the probe by way of with out extreme power. Which means the adapter is functioning correctly, and it is able to be assembled onto the system. Now you might loosen the cap till it’s again to solely simply assembly the O-Ring (barely finger tight).

8. Lastly, insert the probe into the adapter (for mounted adapters be certain that the probe is STRAIGHT and NOT BENT till after inserting by way of the adapter). After the specified positioning is achieved, tighten the adapter’s cap till the thermocouple probe is cosy and can’t transfer simply up and down except power is utilized. The adapter is now correctly assembled and will present a vacuum-tight seal for operation.

Are temperature probes supposed to maneuver?

As soon as probes are positioned, they need to not transfer or be moved. This assumes they have been positioned in an optimum place firstly. If, in the middle of operation, a thermocouple probe is moved to a sub-optimal place, then it’s okay to maneuver it again to the right place for extra correct readings!

If my PTFE melts off my thermocouple probe, can I nonetheless use it?

Sure, you’ll be able to nonetheless use your thermocouple probe. Beneath the PTFE is a stainless-steel probe which might nonetheless be used and can stay correct.

Can I bend my thermocouple probe?

Sure, you’ll be able to bend your thermocouple probe. Bending the thermocouple probe is not going to hurt the probe except bent to extra. Bending the thermocouple probe will permit for a extra correct studying normally, in comparison with when simply the tip of the probe is sitting within the answer or vapor you are attempting to observe.

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