Top positive review
26 people found this helpful
Laboratory Temperature Tested - Figures included.
on 3 December 2017
It takes a fair amount of time to document how an item puts up to the test of purpose after purchasing and if it really is as good as it states, but I managed to make my mind up in less than a week.
I got into my laboratory first thing Thursday morning and was playing around with some thermocouple readers and finally found one I was happy with, a tested & calibrated unit with a new battery.
12pm at around lunchtime I filled the flask up with boiling water straight out of the kettle, enough to get right to the top of the flask and I shut the lid and allowed the heat of the water to dissipate through the flasks metal chamber and warm the unit up internally for around 5 minutes, I put the kettle back on to a boil and as soon as the button clicked I emptied the water out of the flask and re-filled the flask up, creating a good seal and let it sit for 24 hours in my 20*C ambient temperature laboratory before opening back up and taking another measurement.
Friday lunchtime I got my thermocouples ready and opened up the flask at 12:05pm (24 hours after filling) and put the thermocouple inside the flask, with a temperature reading of 68.9*C the water was still steaming and was far too hot for me to drink.
To then accurately repeat this process and get a measurement of the water that went in, I simply repeated my first step but instead of letting the water sit for 24 hours, I took a reading as soon as I filled the flask up. Which was 96.4*C straight from the kettle.
96.4*C - Start Temp
68.9*C - End Temp
96.4*C - 68.9*C = 27.5*C heat loss in 24 hours.
So around 1*C heat loss an hour.
The thermos flask works, it holds heat for 24 hours, it does exactly what it needs to do and meets the stated time.
I still need to do a 24 hour cold temperature test but I may wait until the summer to do that.
And of course I gave it a good test on the lake today fishing, with great results there too.
I hope you enjoyed my review and found it helpful.