Prothermo NMT 538
Hauser Systems & Gauging
15
Diagram 1: NMT538 with Whessoe 1700 & Varec 9909
Standard NMT538 to average probe connection
Caution!
Some RTD probes are equipped with additional bottom and vapor spot bulb besides average
temp element. Unless a probe has these spot elements, connect brown to brown cables, red to
red cables according to diagram 2. Do not skip using brown (No. 1 element) on the NMT538 side
input cables. Not connected to #1 brown wire on NMT538 input will cause open circuit error
(displaying 359°C) constantly.
No.16
No.15
No.14
No.13
No.12
No.11
No.10
No.9
No.8
No.7
No.6
No.5
No.4
No.3
No.2
No.1
B Ø, B
b
yellow & black
green & black
blue & black
orange & black
red & black
brown & black
No.10 (pink)
black
No. 9 (white)
white
No. 8 (gray)
gray
No. 7 (violet)
violet
No. 6 (blue)
blue
No. 5 (green)
green
No. 4 (yellow)
yellow
No. 3 (orange)
orange
No. 2 (red)
red
No. 1 (brown)
brown
white & black
gray & black
black
black
Cables from
Whessoe 1700
Varec 9909
Temperature Probe
from the tank
cables from
NMT538 module
cramp
connection
to NMT538
electronics
Connection in the NMT538 Terminal Housing
violet & black
3 Installation
