Owner manual

<5. Wiring>
5-7
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
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.
ZR22G
Detector
ZR402G
Converter
(1) Ambient temperature of the detector: 80 °C or less
(2) Ambient temperature of the detector: exceeding 80 °C
Heat-resistant wiring
HTR 7
HTR 8
HTR 7
HTR 8
HEATER
HEATER
Terminal box
F5-7E.ai
ZR22G
Detector
ZR402G
Converter
Figure 5.6 Wiring for power to detector heater
5.3.1 Cable Specications
Basically, PVC insulated PVC sheathed cables (2 cores) are used for this wiring. When the
ambient temperature of the detector exceeds 80 °C, install a terminal box, and connect to the
detector using six-piece 600V silicon rubber insulated glass braided wires.
5.3.2 Connection to Detector
When connecting the cable to the detector, proceed as follows:
(1) Mount cable glands or conduits of the specied thread size to the wiring connections of the
detector.
The detector may need to be removed in future for maintenance, so be sure to allow
sufcient cable length.
(2) If the ambient temperature at the location of wire installation is 80 to 150 °C, be sure to use
a exible metallic conduit for the wire. If a non-shielded “ 600V silicon rubber insulated glass
braided wire” is used, keep the wire away from noise sources to avoid noise interference.
(3) The size of the terminal screw threads is M3.5. Each cable should be terminated in the
corresponding size crimp-on terminals contact (*1) respectively.
*1 If the ambient temperature at the detector installation site exceeds 60 °C, use a “ bare crimp-on terminal”.