Choose the mounting location of the sensor, the isolator/barrier unit and the indicating transmitter so that they are protected from sudden impact and friction.
The electrical connections for PR‑21‑S‑…‑IA are described in the following figure.
Cables:
- 10 m (33 ft) cable, part number PR‑8230‑010, connecting the Indicating transmitter STR and the Isolator unit. The maximum cable length is 100 m (330 ft).
- 10 m (33 ft) power cable, part number PR‑8250‑010, connecting the Indicating transmitter STR and the Isolator unit, part number PR‑8250‑010. The maximum length is 100 m (330 ft).
- The intrinsically safe cable between Isolator unit and sensor, part PR‑8260‑xxx, where xxx is the cable length in meters. The maximum length is 100 m (330 ft). For cable connections, see Figure 1 and Figure 1.
| Isolator/Barrier Unit can also use an optional external +24 V DC power supply instead of the +24 V DC power supply from the transmitter. +24 V DC is connected to terminals 13 and 14. If +24 V DC is used, the PR‑8250 power cable is not used at all. |