Check Meter Connection; Wiring; Loop Configuration; General-Use Type And Flameproof Type - YOKOGAWA Dpharp vigilantplant EJA110A User Manual

6.3.4 Check Meter Connection

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 6.3.4 Check Meter 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 Subsection 8.1.2.

(1) General-use Type and Flameproof Type

Hazardous Location
Transmitter terminal box
Figure 6.4.1a Connection between Transmitter and
Distributor
or less.
Power supply
+
–
F0604.EPS
Nonhazardous Location
Distributor
(Power supply unit)
Receiver
instrument
+
–
F0605.EPS

(2) Intrinsically Safe Type

For intrinsically safe type, a safety barrier must be
included in the loop.
Hazardous Location
Transmitter terminal box
Figure 6.4.1b Connection between Transmitter and
Distributor

6.4.2 Wiring Installation

(1) General-use Type and Intrinsically Safe
Type
Make cable wiring using metallic conduit or water-
proof 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 6.4.2a Typical Wiring Using Flexible Metal Conduit
6-2
6. WIRING
Nonhazardous Location
Distributor
(Power supply unit)
Receiver
instrument
+
–
Safety barrier
Apply a non-hardening
sealant to the threads for
waterproofing.
IM 01C21B01-01E
F0606.EPS
F0607.EPS