Endress+Hauser Prothermo NMT81 - WB Probe Design

Prothermo NMT81 Installation
Endress+Hauser 23
5.8 WB probe design
The integrated WB sensor (capacitance water interface measurement) is set at the bottom of
an average temperature probe. The standard water interface measurement ranges are
500 mm (19.69 in), 1 000 mm (39.37 in), and 2 000 mm (78.74 in). The WB probe is made
of 304 stainless pipe protected by 1 mm (0.04 in) thickness PFA tube and a 316L base plate
and side rods. Up to two Pt100 temperature elements can be set in the tube. This allows
constant temperature measurement near the tank bottom.
• Precise initial calibration of NMT81 is performed in accordance with your options prior
to shipping.
• NMT81 cannot measure the water interface if the water inside the tank is frozen.
Ensure that the water in the tank does not freeze.
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Ø42 (1.65)
A0042781
 11 WB probe design. Unit of measurement mm (in)
1 PFA protective tube (thickness: 1 mm)
2 Sensor pipe (304)
3 Pt100 element
4 Base plate/side rod (316L)