Check Meter Connection; Status Output Connection; Wiring; Loop Configuration - YOKOGAWA DpharpEJX vigilantplant EJX110 User Manual

6.3.4 Check Meter Connection

Available only when /AL is not specified.
Connect the check meter to the CHECK + and –
terminals. (Use hooks.)
• A 4 to 20 mA DC output signal from the CHECK +
and – terminals.
(Note) Use a check meter whose internal resistance is 10
Check meter Transmitter terminal box
Figure 6.4 Check Meter Connection

6.3.5 Status Output Connection

When option code /AL is specified, connect the
external wiring as shown in Figure 6.3.5.
To configure and activate the process alarm function
and status output, it is necessary to set some param-
eters. Refer to each communication manual for
procedures.
Transmitter
terminal box
Shielded cable
External power
supply 30V DC,
120mA max
Use two-wire separately shielded cables.
Figure 6.5 Status Output Connection

6.4 Wiring

6.4.1 Loop Configuration

Since the DPharp uses a two-wire transmission system,
signal wiring is also used as power wiring.
DC power is required for the transmitter loop. The
transmitter and distributor are connected as shown
below.
For details of the power supply voltage and load
resistance, see section 6.6; for communications line
requirements, see section 9.1.
or less.
Power supply
+
–
F0604.EPS
24V DC
+
Distributor
–
250
Magnetic
AC power supply
F0605.EPS

(1) General-use Type and Flameproof Type

Hazardous Location
Transmitter terminal box
Figure 6.6

(2) Intrinsically Safe Type

With the intrinsically safe type, a safety barrier must be
included in the loop.
Hazardous Location
Transmitter terminal box
Figure 6.7

6.4.2 Wiring Installation

valve
(1) General-use Type and Intrinsically Safe
Type
With the cable wiring, use a metallic conduit or
waterproof glands.
• Apply a non-hardening sealant to the terminal box
connection port and to the threads on the flexible
metal conduit for waterproofing.
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Figure 6.8 Typical Wiring Using Flexible Metal Conduit
6-2
Nonhazardous Location
Distributor
(Power supply unit)
Connection between Transmitter and
Distributor
Nonhazardous Location
Distributor
(Power supply unit)
Safety barrier
Connection between Transmitter and
Distributor
Apply a non-hardening
sealant to the threads for
waterproofing.
6. WIRING
Receiver
instrument
F0606.EPS
Receiver
instrument
F0607.EPS
F0608.EPS
IM 01C25B01-01E