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B.
Wiring Installation
General-use (Figure 4-4a)
1. Use metallic conduit or waterproof cable glands for wiring.
a. Apply non-hardening sealant to the terminal box and
the threads on the flexible metal conduit for
waterproofing.
Explosion-proof
1. Explosion-proof metal conduit wiring (Figure 4-4b)
a. A seal fitting must be installed near the terminal box
port.
b. Apply a non-hardening sealant to the threads of the
terminal connection box.
4.7.5 Grounding
a.
Grounding should satisfy KS requirements (grounding
resistance should be 10 ohm or less). Grounding is
required for explosion-proof applications and the ground
resistance must be below 10 ohms.
[Note] In case of Built-in Lightening Protector, Grounding
should satisfy Special KS requirements (grounding
resistance, 10 ohm or less).
b.
There are ground terminals on the inside and outside of the
transmitter. Either of these terminals may be used.
c.
Use 600V insulated PVC wire for grounding.
4.7.6 Power Supply Voltage and Load Resistance
When configuring the loop, make sure that the external load
resistance is within the range (see figure below). The transmitter
supply voltage should be:
• Standard
: 11.9 to 45 Vdc
• HART Communication
: 17.4 to 45 Vdc
And maximum loop current is 24mA, Load resistance R:
R = (E-11.9) / 0.022 (E = Power Supply Voltage)
Figure 4-4a Typical Mounting using Flexible Metal Conduit
Figure 4-4b Typical Wiring using Explosion-Proof Conduit
3100 Smart Pressure Transmitter
Internal and External Ground Terminal
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