Prothermo NMT 538
22
Hauser Systems & Gauging
4.2
Temperature calculation
The NMT538 is able to calculate two separate (upper gas/ vapor layer and lower liquid layer)
average temperatures described below.
Typical calculation procedure with multi-spot element
Figure 11: Typical multi-spot element layout
•
· T1,T2…T16 represent temperature data of multi-spot elements
•
· The element T10 is considered exactly positioning at the liquid level; therefore it is not included
neither liquid nor gas average calculation based on terminology of Liquid & Gas offset.
4.2.1
Calculation of average temperature in the liquid layer
Tav, liquid Formula
Caution!
Liquid offset level
Elements to be included in liquid average calculation should be submerged 300mm below liquid
surface at the default setting. Please contact with E Hauser in case of changing "Liquid
offset level".
4.2.2
Calculation of average temperature in the gas / vapor layer
Tav, gas formula
Caution!
Gas offset level
Elements to be included in gas / vapor average calculation should be positioned 300mm above
liquid surface at the default setting. Please contact with E Hauser in case of changing
"Gas offset level".
Canceling defected elements (pending function)
The NMT538 primarily sends out error message to the host gauge regardless of liquid level in
case of the defected element or/and cable present during the operation. The operator can
command the NMT538 to cancel defected elements to be out of calculation purposely by limiting
gas/vapor average calculation disabled.
Gas
Liquid
Flexible
tube
av, liq
=
9
1
i =1
9
i
av, gas
=
6
1
i =11
16
i
4 Operation Principle
