Boiling Retardation - UMS T5 User Manual

Useful notes
True pressure in heights over sea level at an atmospheric
pressure related to sea level as published by meteorological
services
Height over sea
level (meter)
0
500
1000
1500
2000
2500
3000
6.1.3

Boiling retardation:

Water needs a nucleation site to boil. As our Tensiometers have
polished surfaces and a gas-free filling the so called boiling
retardation occurs – the Tensiometer keeps on measuring beyond
the boiling point. To achieve this the T5(x) must have an absolutely
bubble free filling.
Some T5x can go down to -250 kPa before they run dry, occasionally
even a range of -450 kPa is achievable. As this is exceptional there
is no guarantee for this measuring range.
Atmospheric
pressure (kPa)
101.3
95.5
89.9
84.6
79.5
74.5
70.1
35/48
Max. measuring
range at 20°C (kPa)
-99.0
-93.2
- 87.6
- 82.3
-77.2
-72.2
-67.8