Endress+Hauser Prothermo NMT81 - Page 28

Installation Prothermo NMT81
28 Endress+Hauser
• Element intervals
• The procedure for installing NMT81 will vary depending on the tank's shape and type. A
cone roof tank and a floating roof tank are used for the following examples. The procedure
to mount NMT81 flange on a tank nozzle flange is the same regardless of what type of tank
is being used.
• The recommended diameter of the installation nozzle is:
• Temperature only probe : 32A (1-1/4") or more
• With WB probe: 50A (2") or more
5.10.1 NMT81 Installation
Confirm that the size of the nozzle and the flange is matched prior to mounting NMT81 on
the tank. The flange size and the rating of NMT81 vary depending on the customer’s
specifications.
• Check the flange size of NMT81.
• Mount the flange on the top of the tank. The deviation of the flange from the horizontal
plane should not exceed +/- 1 degree.
• Install NMT81 at least 300 mm (11.81 in) or API 7: 1 000 mm (39.4 in) away from the
wall. This will ensure that the temperature measurement is not affected by the tank's
ambient or wall temperature.
+1°
-1°
1
A0026889
 17 Allowable inclination of mounting flange
1 Nozzle
Insert the temperature probe and the optional WB probe and low profile anchor weight
through the tank nozzle at the top of the tank.
To prevent damage to the temperature probe and WB probe, ensure that they do not
touch anything during insertion through the installation nozzle.