A basic Peltier element will likely work (may need a stack of two to reach -20) however the simpler option indeed would be to 'fake out' thermocouple input using a voltage, as described by Ivan.
https://us.flukecal.com/Thermocouple-Temperature-Calculator And for $38 one can apparently purchase a thermocouple simulator https://www.brightwinelectronics.com/product/temperature-calibrator-k-n-thermocouple-generator-simulator Artem On Thu, Feb 2, 2023, 3:42 PM Rajkovic, Ivan < 000095c2dc0d4fa4-dmarc-requ...@jiscmail.ac.uk> wrote: > Hi Tim, > > Not sure if this would work, but can you get a voltage supply and connect > it instead of the thermocouple? You would need something to provide a few > mV: > https://www.thermocoupleinfo.com/type-k-thermocouple.htm > > > Ivan > > > > -----Original Message----- > > From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> On Behalf Of Tim > > Gruene > > Sent: Thursday, February 02, 2023 11:57 AM > > To: CCP4BB@JISCMAIL.AC.UK > > Subject: [ccp4bb] small scale -15C chiller > > > > Good day, > > > > I would like to cool a K-type thermocouple down to -15C. The temperature > does > > not need to be very accurate, nor exactly -15C, just below that level. > > > > I was thinking of using a piezo-chiller, but they don't seem to be very > energy > > efficient. > > > > Could anyone make a recommendation for a simple device to cool the tiny > > thermocouple to -15C to -20C? > > > > For the details: we have an inhouse diffractometer with a dead detector. > The > > system is blocked, because the temperature of the detector needs to be > below - > > 15C. It is measured with a K-type thermocouple. I tested with liquid > nitrogen. > > The system show -64C (probably the limit of the thermocoupe) and I can > operate > > the system (and mount our new (brand-alien) detector). > > > > Thanks a lot! > > > > Best, > > Tim > > > > -- > > -- > > Tim Gruene > > Head of the Centre for X-ray Structure Analysis Faculty of Chemistry > University > > of Vienna > > > > Phone: +43-1-4277-70202 > > > > GPG Key ID = A46BEE1A > > > > ################################################################# > > ####### > > > > To unsubscribe from the CCP4BB list, click the following link: > > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 > > > > This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a > mailing > > list hosted by www.jiscmail.ac.uk, terms & conditions are available at > > https://www.jiscmail.ac.uk/policyandsecurity/ > > ######################################################################## > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 > > This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a > mailing list hosted by www.jiscmail.ac.uk, terms & conditions are > available at https://www.jiscmail.ac.uk/policyandsecurity/ > ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
