Hach-Lange SIGMATAX2 - Manual (Page 23)

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