Hach SIGMATAX 2 User Manual page 23

Figure 12 Terminal assignment
Connection cable for pipe trace heater
1
Fault indication contact (circuit diagram shows contact
2
during a fault indication)
Open 1/2, closed 2/3
Route the signal lines (1, 2, 3) separated from the power cable.
Connection terminals for heater
3
(N, L = terminals 8 + 9 from the top)
Connection terminal for earth conductor
4
N O T I C E
Installation
23