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Resoldering leads to cernox sensor

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victorleong
New Member

Posts: 2

Resoldering leads to cernox sensor Apr 21, 2021 0:44:07 GMT -5

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Post by victorleong on Apr 21, 2021 0:44:07 GMT -5

Hi!
I have a Cx-1050-sd-ht-1.4L sensor, where the leads have broken off at the sensor. I have tried to resolder them using standard lead solder, but now the resistance seems to be very different. According to the supplied calibration curve, the resistance at room temperature is nominally ~70 ohm, but now it is ~8 ohm. Upon inspection under a microscope, it does not appear to be a short caused by excess solder. What could be the reason for this, and how might we repair it?
Thanks!

Lake Shore Jeff M
Lake Shore

Posts: 327

Resoldering leads to cernox sensor Apr 21, 2021 7:03:55 GMT -5

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Post by Lake Shore Jeff M on Apr 21, 2021 7:03:55 GMT -5

It is difficult to say exactly what is wrong. The first thought would be a short between the bonding pads which you have inspected. If you use a flux when performing the soldering, make sure it is cleaned off so that it does not allow conductance between the pads.

My second thought is that you have overheated the sensor causing its resistance to shift. If this is the case, it cannot be recovered and you would need to purchase a new sensor.

At this time, the only option I can offer is to have you contact our representative and retirn the sensor to Lake Shore for an inspection and analysis to determine if it can be repaired. You can contact aNexus at:

aNexus

20 Sin Ming Lane
#08-53 Midview City,
Singapore 573968

ywwong@anexuscorp.com
Tel: +65 6365 5028
Fax: +65 6365 5450