Hi, I am a technician who frequently has to replace NTC sensors on the thermoblock boilers of coffee machines that get as hot as 300 degrees F. Quite a frequent repair! Instead of getting these sensors in Germany used, I want to order them direct from Digikey and there are several mfg like VISHAY and AMETHERM who put out the lug sensor I need. Ok, they are 10K ohm sensors but there is a variety of course specified by parameters I do not understand. Can somebody give me a recommendation here? Main thing is they need to withstand the temperature mentioned and be responsive as possible to changes in temperature. OR can I take my existing NTC sensor and have somebody extrapolate these params? Best way to go here!
Hi Mattinla,
Thank you for your inquiry. Please verify if these options (click here) will work for you:
Ok these are EXCELLENT, can you help me further.
I am currently getting these from GERMANY to use on JURA coffee machines that I repair.
They are now very expensive to get even USED, and take forever due to the Covid slowdown
The STEAM BOILER on these has a lug through hole, thermal sensor that frequently fails. It can get as hot as 320F, which seems to be slightly above the upper limit of 150C for most of these lug type sensors which is probably why it fails. There is no digital readout for temperature on these.
They are all 10K sensors. Can you recommend a specific MOLEX lug sensor with female connector that should do the job?
And a VISHAY one with no connector like 6” long….
I have used good sensors, is there any simple test I can do on these to do a match-up?
Hi Mattinla,
Please verify specifications of 900-2138601635-ND | BC2896-ND, click here. The best way to test these is measure the resistance value at a certain temperature.
I can do that, can measure resistance at 100C. What do I do with that information, how do I match it up with yours?
Or is that just a testing methodology?
These also fail in very unpredictable ways!
Selecting a thermistor with a similar beta value to the original would be important. This page offers an explanation of beta values and a calculator you can use to estimate the value for a given device based on resistance measurements at two known temperatures.
hello did you ever come up with a NTC thermistor replacement for the jura machines i am dealing with the same problem and wondering if you found a replacement thanks in advance
***Yes just use a commonly available thermal fuse to replace get the required temperature rating off the old one, good to go, no real problem here……………
Oh sorry, you’re talking about the thermal NTC SENSORS, OK those are strictly OEM through JURA who does NOT sell any parts domestically you need to get them used in GERMANY like I do or you can go here to this mega-ripoff site might be the best way to go……………also be prepared to do a gender change on the plug as well!
Go here: https://www.jura-parts.com/searchresults.asp?Search=sensor&Submit=
2 different thermoblock sensors available at the incredible ripoff price of $45 what nerve
I landed here with the same issue as @MATTINLA. I bought one of the $45 sensors for the Jura Ena 9 and made some measurements. The sensor I got has a beta value of around 3500. My assessment is that a beta (preferably something like B25/85) value anywhere between 3300 and 3700 will work, which narrows down @Ryan_2724’s original suggestions to these. The lug on mine has a 5mm diameter hole so you’d have to double-check that.
For the curious, you can look at my measurements here.
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The next question is the connector. Here are some photos. Looks like the pitch is 2.5mm. Can anyone help?
Hello, Digilio. Welcome to TechForum.
Your connector looks like a black-colored XHP-2 from JST, here: https://www.digikey.com/short/2dd5pd72
Contacts and pre-crimped jumper wires can be found in the “ASSOCIATED PRODUCT” section at the bottom of the linked page.
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OK, so here’s the full shopping list:
10k @ 25C, 3435 B25/85, M5 lug NTC - Vishay NTCALUG54A103GLA
Receptacle Connector - JST XHP-2
Thanks @raelynn.roen for the connector ID!
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Contacts with various length leads (I can only put two links in the post…) - 2 - 12"
Thanks so much @digilio for posting this! Just wondering if anyone has had any luck with the steam thermoblock thermistor on the older S models. It’s not a lug style as you know.
Thanks in advance!
No need for the whole assembly. You can drill the old one out and glue a bare one like this into it: NXFT15XH103FA2B060 Murata Electronics | Sensors, Transducers | DigiKey
This way you have more options and cheaper too.