1. Signal and Excitation Wires
1.1 Signal Wire Processing
This heat meter provides equipotential excitation shielded signal output voltage to reduce the influence of distributed capacitance of the cable transmission on flow signal measurement. When the measured conductivity is less than 50 μS/cm or for long-distance transmission, a dual-core double-shielded signal cable with equipotential shielding can be used. For example, the STT3200 special cable or the BTS type triple-shielded signal cable.
1.2 Excitation Current Wires
The excitation current wires can use a two-core insulated rubber flexible cable, with the recommended model number RVVP2*0.12*250mm². The length of the excitation current wires is the same as the length of the signal cable.
When using the STT3200 special cable, the excitation cable and the signal cable are combined into one cable.

2. Instrument Terminal Wiring

Figure 1.1 M8RBF15/16 Mainboard Wiring Terminal Diagram

Figure 1.2 M8RBF20 Mainboard Wiring Terminal Diagram

Figure 1.3 M8RBF22/25 Mainboard Wiring Terminal Diagram

Note: Figure 1.3 Switch A is the selection switch for Pt1000 and Pt100 thermistors. The factory default is Pt1000 thermistor, with switches 1 and 2 both set to OFF. If the user uses a Pt100 thermistor, switches 1 and 2 must both be set to ON.