Yokogawa DM8C/VD6 Liquid Density Analyzer - Manual (Page 42)

< 3. INSTALLATION, PIPING AND WIRING >
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IM 12T03A01-02E
3.4.2 Wiring for Analog Output Signal
Output signal of 4 to 20 mA DC output (load resistance 550 Ω or less) and 0 to 1 V DC (load
resistance 250 k Ω or more) are provided. Carry out either or both of wirings as necessary.
Shielded 2-conductor (for one signal) or 4-conductor (for two signals) cable are used for wiring. For
connecting the cable to the converter, remove the sheath of conductor about 50 mm from its end, and
attach a solderless lug for M4 screw omit. The shield of the cable should be grounded at the receiving
unit.
Wiring method (metal conduit and others) is same as that of Section 3.4.1.
3.4.3 Wiring for Digital Output Signal
The Model DM8C density converter outputs digital signals through RS-232C interface besides analog
signal (for details of digital signal, refer to “Standard Specifi cations” in Chapter 1).
When using this signal, use a shielded 3-conductor cable for wiring. Cable length from the converter
to a receiving unit should be 10 m or less.
Cable termination is same as that of Section 3.4.2, however, remove the sheath of conductor 80 mm
from the end.
Wiring method is also same as that of Section 3.4.1.
3.4.4 Wiring for Abnormal Status Contact Output
When an error (see Table 4.2) occurs with an abnormality in the density measuring system, a contact
signal is output.
For wiring of this contact output, use 2-conductor cable. When connecting the cable to the converter,
remove the sheath of conductor 80 mm from its end and attach a solderless terminal for M4 screw.
Wiring method is same as that of Section 3.4.1.
3.4.5 Wiring for Power Supply
This wiring is to supply the converter with power.
Use shielded 2-conductor cable for wiring. Cable termination and wiring method are the same as
those for analog output signal in Section 3.4.2.
3.4.6 Wiring for Grounding
As a rule, the case of the density detector and the density converter should be earthed.
The grounding terminal of the detector is located on the base for the mounting bracket, and of the
converter, on the bottom of the case. Perform wiring so that ground resistance is 100
Ω or less
(Class D) using a wire of 2 mm 2 nominal cross-sectional area.