Guide to thermal response times for various sheath diameters
Sheath Diameter/mm Insulated Hot Junction Grounded Hot Junction Exposed Hot Junction
A B C A B C
0.25 0.02 0.10 0.70 0.01 0.04 0.25 Approx. 1/10th of the values listed for grounded junction
0.50 0.05 0.25 1.80 0.025 0.10 0.80
1.00 0.13 0.60 4.50 0.07 0.30 2.50
1.50 0.29 1.00 9.00 0.15 0.50 5.00
3.00 0.75 2.80 25.00 0.40 1.50 14.00
4.80 1.70 4.90 50.00 0.80 2.50 26.00
6.40 3.00 8.00 80.00 1.50 4.00 39.00

1) The values in the table represent the time for the thermocouple junction to reach 63.2% of a step change in Gas or Liquid.

2) Conditions: 'A' = Ambient air into boiling water. 'B' = Moving water @ 1.52 Mtrs/sec.. 'C' = In moving air at mass vel. of 2.9 gms/sec cm2