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14
P G X 1 0 0 A N D PA X 1 0 0 | P R E S S U R E T R A N S M I T T E R S | O I/ P G X / PA X 1 0 0 - E N R E V. C
5 Transmitter wiring
WARNING
General Risks .
Observe the applicable regulations governing electrical installation. Wiring must be executed in absence of power supply.
Before installing the device, check that the existing operating voltage corresponds to the power supply limits indicated on the
name plate.
Make sure to remove the power supply before connecting and/or disconnecting the device. High voltage that may be present on
terminals can cause electrical shock.
Since the device has no overvoltage or lightning protection inside, the installer have to use external protection to increase the
immunity level, if required.
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.
Supply requirement
For signal/power connection use twisted, stranded pairs of wiring no 18 to 22 AWG / 0.8 to 0.35mm2 ø up to 5000 feet (1500
meters). Longer loops require larger wire.
If a shielded wire is used, the shield should be grounded only at one end, not both ends. In case of wiring at transmitter end,
use the terminal located inside the housing marked with the appropriate sign.
The 4 to 20 mA dc output signal and the dc power supply to the transmitter are carried from the same pairs of wires.
The transmitter operates from 10.5 to 42 V DC with no load and is protected against reverse polarity connection.
For Ex ia and other intrinsically safe approval power supply must not exceed 30 V DC.
Minimum operating voltage increase to 14.5 V DC with optional backlight LCD display.
For maximum power supply voltage please refer to the identification plate of the transmitter.
The actual possible line length of the electrical circuit depends on the total capacitance and resistance, and can be estimated using
the following formula:
Where:
L = Line length in m
R = Total line resistance in Ω (ohms)
C = Line capacitance in pF/m
Cf = Capacitance of the devices located in the circuit in pF
Avoid routing cables with other electrical cables (with inductive load, etc.) or near large electrical equipment.
Cable connection
Depending on the variant selected, the electrical connection port is a standard threaded M16 x 1.5 entry.
Alternative threads ½ in - 14 NPT or M20 x 1.5 through adapter can be selected in the ordering information. The adapters must be
closed with a 5/10 Nm tightening torque to avoid leakages, paying attention to the o-ring between the housing and the adapter.
The screw terminals are suitable for wiring cross-sections up to 1.5 mm2 (16 AWG).
It is recommended that you strip approx. 30 to 35 mm (1.18 to 1.38 inch) off the cable jacket (see figure 8).
Use wiring rated 10 °C minimum above ambient temperature.
Figure 8 - Stripped connecting cable
IMPORTANT
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.
30 - 35 mm
1.18 - 1.38 inch
M10708
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