Prothermo NMT81 Installation
Endress+Hauser 15
Elements Standard Temperature coefficient
Cu100 GOST α=0.00428
Ni100 GOST α=0.00617
• If elements other than the items above are required, contact your Endress+Hauser
Sales Center.
• NMT81 is four-wire only with MRTs (Multi-Resistance thermometers) and/or MSTs
(Multi-spot thermometers), but it is not compatible with a thermo coupling
temperature device.
• The physical connection between a probe and NMT81 is completed by a zinc-plated
carbon steel G 3/4" (NPT 3/4") universal threaded coupling. If a different thread size
is required, Endress+Hauser can provide the simplest and most efficient solution by
adapting a variety of coupling sizes and materials based on existing temperature
probe specifications. Contact your Endress+Hauser Sales Center.
• Power supply and data transmission lines are both provided from the host gauge of
NMS5, NMS8x, NMR8x, NRF81 or NRF590 through a two-wire local HART loop
connection. NMT81 can be configured and operated using FieldCare, which has a
user-friendly interface.
5.3 Option 2: Converter with M20 mounting thread
This option model is designed specifically to connect with a Whessoe Varec 1700 series
average temperature probe. WB data is not available because the 1700 series does not
have WB.
182.3 (7.18)
M20
32 (1.26)
37
(1.46)
1
2
A0042766
5 Option 2: converter (Varec 1700, M20 threaded connection). Unit of measurement mm (in)
1 Existing 1700 series RT probe terminal box on-site
2 Lock nut
UK model M20 threaded type and Varec 1700 terminal housing connection procedure
1. Use sealing tape to protect the threaded connection opening, and insert the cable
bundle (RTD signal entry cable) into the female threaded connection opening on the
terminal box.
2. Screw on the NMT81 converter by rotating it at least 10 times clockwise, and secure
it with a lock nut.
A loose connection between NMT81 and Varec1700 terminal housings will lead
to malfunction due to ingress of flood and other factors.
This completes the procedure.
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