Transmitter Wiring; Cable Connection; Analogue Output (Hart) Transmitter Wiring - ABB 266HSH Operating Instructions Manual

6 Transmitter wiring

Warning - General risks. Observe the applicable regulations
governing electrical installation. Connections must only be
established in a dead-voltage state. Since the transmitter has no
switch-off elements, overvoltage protection devices, lightning
protection, and voltage separation capacity must be provided at the
plant (overvoltage/lightning protection is optional). Check that the
existing operating voltage corresponds to the voltage indicated on
the name plate. The same lines are used for both the power supply
and output signal. In case the surge protection option is present
and the transmitter is installed in a Hazardous area, the transmitter
has to be power supplied from a voltage source isolated from
mains (galvanic separation). Furthermore the potential equalization
for the entire powering cable must be guaranteed since the intrinsic
safety circuit of the transmitter is grounded.
Electrical shock can result in death or serious injury. Avoid contact
with the leads and terminals. High voltage that may be present on
leads can cause electrical shock.
Do NOT make electrical connections unless the electrical code
designation stamped on the transmitter data plate agrees with the
classification of the area in which the transmitter is to be installed.
Failure to comply with this warning can result in fire or explosion.

6.2 Analogue output (HART) transmitter wiring

6
- +
Figure 10: HART transmitter connection scheme
HART hand-held communicator may be connected or between
the terminals Vout/COMM and PWR- or at the terminal blocks
of the voltmeter.
14 OI/266/LowP-EN Rev.A | 2600T Series Pressure transmitters
5
+
2

6.1 Cable connection

Depending on the design supplied, the electrical connection is
established via a cable entry or 1/2-14 NPT thread. The screw
terminals are suitable for wire cross sections of up to 2.5 mm2
(AWG 14).
Important. With Category 3 transmitters for use in "Zone 2", a
qualified cable gland for this type of protection must be installed by
the customer (see the section "Hazardous Area Consideration"). An
M20 x 1.5 threads is located in the electronics housing for this
purpose. For transmitters with "Flameproof enclosure" (Ex d) type
of protection, the housing cover must be secured using the locking
screw. The screw plug that may have been supplied with the
transmitter must be sealed at the plant using Molykote DX.
The installer assumes responsibility for any other type of sealing
medium used. At this point, we wish to draw your attention to the
fact that increased force will be required to unscrew the housing
cover after an interval of several weeks.
This is not caused by the threads, but instead is due solely to the
type of gasket.
4
+
-
3
6 Transmitter wiring
1 - Power source
2 - Hand-held
communicator
3 - External
ground termination
-
point
4 - Internal
+
ground termination
point
5 - Line load
1
6 - 1 to 5 V DC
out (Voltmeter)