Instruction manual

5.0 WIRING SM425 INSTRUCTION MANUAL
5.2.3 Connection to the Converter
To connect the wiring to the converter, proceed as follows:
1. M4 screws are used for the terminals of the converter. Each wire in the cable should be
terminated with the corresponding size crimp-on terminal.
2. If a rubber insulated glass braided wire is used to wire the detector, use a terminal box. For wiring
between the terminal box and the converter, use PVC sheathed PVC insulated cable rather than
individual wires.
The above is to prevent moisture or corrosive gas from entering the converter and grounding the detector.
5.3 Wiring for Power to Detector Heater
This wiring provides electric power from the converter to the heater for heating the sensor in the detector.
Figure 5-6 Wiring for power to the detector heater
5.3.1 Cable Specifications
PVC insulated PVC sheathed control cables (2 cores) are recommended for wiring the SM425. When the
ambient temperature of the detector exceeds 80°C, install a terminal box and connect to the detector
using six 600V silicon rubber insulated glass braided wires.
42500001 REV A 87