A faulty sheathed max. thermometer
Posted: Sat Jul 23, 2016 1:11 pm
I've had a bad run with my sheathed maximum thermometers - three in twelve months.
The first I broke while adjusting after the 0900 obs., and the second had an irremovable break in the mercury column, and now the third has a fault.
When releasing the mercury column passed the constriction, I have to continually shake the thermometer, instead of the normal single shake. This in turn sometimes splits the mercury column. Yesterday I spoke to the guy at Metcheck ( Skyview Systems of Sudbury), and he was of the opinion that this is a common problem with new sheathed maximum thermometers, due to the the mercury substitute now being used. I was under the impression that after the new European regulations, mercury was still permitted in scientific instruments, including maximum thermometers.
Any comments on this would be much appreciated.
Nick Robinson,
Colchester NE2
The first I broke while adjusting after the 0900 obs., and the second had an irremovable break in the mercury column, and now the third has a fault.
When releasing the mercury column passed the constriction, I have to continually shake the thermometer, instead of the normal single shake. This in turn sometimes splits the mercury column. Yesterday I spoke to the guy at Metcheck ( Skyview Systems of Sudbury), and he was of the opinion that this is a common problem with new sheathed maximum thermometers, due to the the mercury substitute now being used. I was under the impression that after the new European regulations, mercury was still permitted in scientific instruments, including maximum thermometers.
Any comments on this would be much appreciated.
Nick Robinson,
Colchester NE2