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Thread: Thermometer
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22-01-2011, 05:50 PM #1
Thermometer
Can you please let me know what thermometer you are using to measure superheat in a walk-in freezer.
I have been using a multi-meter with a type K thermister adaptor measuring pipe surface temperature but at –20ºC the multi-meter (fluke) does not seem to give stable readings.
I have looked into other electronic thermometers but they are all rated at an ambient of <0ºC. Infrared thermometers have the same problem.
Any suggestions would be appreciated
Mark
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22-01-2011, 06:23 PM #2
Re: Thermometer
hi mbreward,
I have for a long time had a RS206 -3738 c+f , hold button, t1 and t2 plus plastic cover< which I put on the thermometer upsidedown to cover the readout screen.
happy testing, sedgy,
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23-01-2011, 12:18 AM #3
Re: Thermometer
Hi mbreward
you could use a superheat calculation kit where the thermometer measures the direct temp of the refrigerant.
It is not a stable measurement - it is dynamic and due to the flow and constant adjusting of the metering device. The one is use is about 10 years old and it would be good if a manufacturer would build one that gives a K value with average, min and max readings. I use the yellow jacket ritchie.
I spoke with a boss from CPS in the USA last year and he said they were working on an electronic diagnosis tool which also did data logging.
0°C is a standard calibration temp I think the next standard is around 28°C (mercury) so 0°C is the closest for calibration for measuring superheat. I also have a fluke with a high digit resolution but have found they are not accurate and the range is too high.
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23-01-2011, 12:10 PM #4
Re: Thermometer
Thanks Sedgy
Can you tell me what probes you use
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23-01-2011, 12:32 PM #5
Re: Thermometer
Hey Lads
I was constantly having trouble with readings from various manufacturers thermometers and found i was wasting money constantly buying new ones (although i now possess quite the collection)
In the end i bit the bullet and bought a yellow jacket system analyser.Real time superheat and subcooling graphable readings
and Monitoring capabilities all downloadable for client presentation.
A bit pricey but in my opinion well worth it .Has paid for itself over and over in time saved.
The only thing i did was replace the k-type leads with 2 clamp on probes from my combustion test kit.
It cost E800 and software upgrades are free from the Yellow Jacket site after registration(which is free)
Cheers
Stu
http://www.yellowjacket.com/node/928Last edited by stufus; 23-01-2011 at 12:35 PM.
Tool's ? check ! Condom's ? check !
If you can't fix it , f*ck it !!!
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23-01-2011, 01:02 PM #6
Re: Thermometer
stufus
Wow that is really cool and just what I have been looking forward to, thank you and of course I had faith in Yellow Jacket all these years. Just to be sure are there any other members that have a better product that we should know about before we spend the money?
Stu (Tesla)
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23-01-2011, 01:05 PM #7
Re: Thermometer
hi mbreward, yes I used 2x binda pointed sensors. Velcro held sensors, handheld surface sensor and a couple of 5 meter cable sensors< with bare wire ends< hope this helps
sedgy
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25-01-2011, 06:20 PM #8
Re: Thermometer
Thanks for your suggestions, I'll look into both of them, the Yellow jacket superheat testing kit looks very good & reading the refrigerant temperature must be better than the pipe surface temperature
thanks again
Mark
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25-01-2011, 07:29 PM #9
Re: Thermometer
Tool's ? check ! Condom's ? check !
If you can't fix it , f*ck it !!!
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25-01-2011, 11:59 PM #10
Re: Thermometer
Hi,
I was using Testo 560-2 Refrigeration System Analyzer (for ammonia and other 30-40 max refrigerants ) good instrument .... can be connected to PC to store data etc...etc... quite expensive was that one about 2500E+ ... of course with wire and radio temp probes, SS flexible hoses...
Best regards, Josip
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
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