Cerabar S PMP71 with 4 to 20 mA HART Wiring
Endress+Hauser 17
4.2 Connecting the measuring unit
4.2.1 Supply voltage
!
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.
• All explosion protection data are given in separate documentation which is available upon
request. The Ex documentation is supplied as standard with all devices approved for use in
explosion hazardous areas.
Taking 4 to 20 mA test signal
A 4 to 20 mA signal may be measured via the positive and test terminal without interrupting the
measurement. The minimum supply voltage of the device can be reduced by simply replugging the
jumper. As a result, operation is also possible with lower voltage sources. To keep the measured
error below 0.1%, the current measuring device should exhibit an internal resistance of < 0.7 Ω.
Observe the position of the jumper in accordance with the following table.
4.2.2 Cable specification
• Endress+Hauser recommends using twisted, shielded two-wire cables.
• Terminals for wire cross-sections 0.5 to 2.5 mm
2
(20 to 14 AWG)
• Cable outer diameter: 5 to 9 mm (0.2 to 0.35 in)
Electronic version Jumper for 4 to 20 mA test signal in
"Test" position (order configuration)
Jumper for 4 to 20 mA test signal in
"Non-Test" position
4 to 20 mA HART, version for
non-hazardous areas
11.5 to 45 V DC 10.5 to 45 V DC
Jumper position for test signal Description
– Taking 4 to 20 mA test signal via plus and test terminal:
possible. (Thus, the output current can be measured without
interruption via the diode.)
– Order configuration
– Minimum supply voltage: 11.5 V DC
– Taking 4 to 20 mA test signal via plus and test terminal:
not possible.
– Minimum supply voltage: 10.5 V DC
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