Wiring Cerabar M HART
18 Endress+Hauser
4 Wiring
4.1 Connecting the device
!
Note!
• When using the measuring device in hazardous areas, installation must comply with the
corresponding national standards and regulations and the Safety Instructions or Installation or
Control Drawings.
• Protective circuits to prevent reverse polarity, HF influences and overvoltage peaks are installed.
• The shield or grounding (if present) must always be connected to the internal ground terminal
p
in the housing.
• The supply voltage must match the power supply on the nameplate (→ see Page 6, Section 2.1.1
"Nameplates").
• Switch off the supply voltage before connecting the device.
• Unscrew the housing cover.
• If present, remove the retaining ring with the onsite display.
– Push up the latch with the arrow until the grip of the retaining ring is audibly released.
– Release the retaining ring carefully to prevent damage to the display cables. The connector of
the display can remain plugged in.
• Guide the cable through the gland. Preferably use twisted, shielded two-wire cable.
• Connect the device in accordance with the following diagram.
• Where applicable, refit the retaining ring with the onsite display. The grip of the retaining ring
clips in with an audible click.
• Screw down housing cover.
• Switch on supply voltage.
P01-PMx4xxxx-04-xx-xx-xx-013
Fig. 17: Electrical connection 4 to 20 mA
➀ Disassembling the onsite display: To release the retaining ring from the electronic insert, push up the latch with
the arrow.
➁ The terminal n on the electronic insert is for grounding and is already wired internally. If the connecting cable
also has a shielding or ground cable within it, then this may only be connected to the internal ground terminal
p
of the housing, not to terminal
n. The terminals are designed to take one wire each.
➂ 4 to 20 mA test signal: you can take a 4 to 20 mA test signal via the terminal lugs without interrupting the
measurement.
➀
1
2
3
+
–
➁
3
4
+
–
Zero
Damping
on off
Span
Display
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