Deltabar PMD78B HART
Electrical connection
Hauser
31
Depending on the supply voltage and the current consumption, Bluetooth can optionally be
switched on or off. For the dependency, see the diagram:
10.5
11.0
12.5
13.5
14.5
15.5
16.5
17.5
18.5
I
LOOP
U
3.6
3.8
4
4.2
4.4
4.6
4.8
5
5.2
5.4
A
B
C
A0047056
A
Display lighting switched on, Bluetooth can be switched on optionally
B
Display lighting switched off and Bluetooth can be switched on optionally
C
Display lighting switched off and Bluetooth not active
6.2.2
Terminals
• Supply voltage and internal ground terminal: 0.5 to 2.5 mm
2
(20 to 14 AWG)
• External ground terminal: 0.5 to 4 mm
2
(20 to 12 AWG)
6.2.3
Cable specification
• Protective ground or grounding of the cable shield: rated cross-section > 1 mm
2
(17
AWG)
Rated cross-section of 0.5 mm
2
(20 AWG) to 2.5 mm
2
(13 AWG)
• Cable outer diameter: Ø5 to 12 mm (0.2 to 0.47 in) depends on the cable gland used
(see Technical Information)
6.2.4
4-20 mA HART
2
3
4
Y
+
+
-
-
I
1
mA
A0028908
2
Block diagram of HART connection
1
Device with HART communication
2
HART communication resistor
3
Power supply
4
multimeter
The HART communication resistor of 250 Ω in the signal line is always necessary in
the case of a low-impedance power supply.
Take the voltage drop into consideration:
Maximum 6 V for a 250 Ω communication resistor
