Yokogawa GD40 Gas Density Detector - Manual (Page 35)

<2. Installation, Wiring and Piping>
2-12
IM 11T3E1-01E
2.4 Wiring
WARNING
Danger High Voltage !
Some parts of the meter’s internal assembly have high voltages. Inadvertent contact with those
parts may result in electrical shock or injury. ALWAYS turn off the power to the meter before
removing the rear or front cover by using external circuit breaker.
This section explains how to wire the GD402 Analyzers. Note that this document is limited to the
basic system configuration only (detector, converter and pressure transmitter).
For details on the wiring of instruments used to receive analog output signals or contact output
signals, see their respective instruction manuals.
CAUTION
The GD402 gas density meter is shipped after adjusting the both of detector and converter in
pairs. When installation, confirm whether the serial number on both of converter and detector are
in pairs or not. If mismatched in pairs, converter is to be out of order. When converter or detector
supplied individually, enter the detector constants, described on inside the lid of the GD40, into
converter so that the GD402 is going to be well.
In detail, please refer to Figure 5.30, Figure 6.31 or Figure 7.28.
2.4.1 Wiring Procedure
(1) The types of cables wired to the GD402 Analyzers are:
• Cable wired to power supply
• Cable wired to detector input
• Cables wired to output signals (two) -- or one signal if BRAIN communication is used
• Cables wired to contact outputs (five) -- provided as necessary
• Cable wired to contact input -- provided as necessary
• Cables wired to pressure transmitter
• Cables wired to the ground
(2) The GD402 converter has six cable inlets for external wiring. Wire the converter through
cable glands. As a rule, choose cable glands as shown in Figure 2.11.
<GD402G>
Unit : mm (in.)
F0213.ai
36 36
36 (1.4)
A B C
D F E
Cable inlet (21 mm in dia.)
Compatible with a PG 13.5 cable gland
Grounding terminal (4 mm screws)
38 (1.5)
(1.4) (1.4)
Cable gland Connection
A, B
• Pressure transmitter
• Analog Output • Contact Input
• Detector
C
• Contact Output D, E
• Power Supply F
Weight : Approx. 3 kg (6.6 pounds)
(including mounting hardware)