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PGX 10 0 A N D PA X 10 0 |
P R E SSU R E T R A N SM I T T ER S | O I/P G X /PA X 10 0 - EN R E V. C
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+
+
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internal earth terminal
power supply and
signal terminals
connector for LCD
communication board
power supply unit
resistor
line load
pushbutton for
0 (LRV setting)/
Span (URV setting) or
write protection
cable entry
handheld
terminal
optional
ground
receiver unit
SAFE AREA
HAZARDOUS AREA
SEE INSTRUCTION MANUAL FOR CABLE
TEMPERATURE RATING
!
CAUTION
. . .5 Transmitter wiring
Output (HART) transmitter wiring
Figure 9 - Transmitter connection scheme
HART hand-held communicator may be connected at any wiring termination point in the loop, providing the minimum resistance is
250 ohm. If this is less than 250 ohm, additional resistance should be added to allow communications. The handheld terminal is
connected between the resistor and transmitter, not between the resistor and power source.
Application
Permissible voltage range of power supply
Standard
With optional backlit LCD display
Transmitter operated outside the potentially explosive atmosphere
from 10.5 to 42 V
from 14.5 to 42 V
Transmitter operated inside the potentially explosive atmosphere
from 10.5 to 30 V max (intrinsically safe)
from 14.5 to 30 V max (intrinsically safe)
If, when using transmitters with type of protection “intrinsic safety”, an ammeter is connected to the output circuit or a modem
is connected in parallel while there is a risk of explosion, the sums of the capacitances and inductances of all circuits, including
the transmitter (see the related ATEX and IECEx certificates) must be equal to or less than the permissible capacitances and
inductances of the intrinsically safe signal circuit (see the related ATEX and IECEx certificates for the power supply unit).
For CSA ordinary location, the maximum current must be limited to 150 mA by fuse (slow blow) or by a current limiter.
Communication setup
The transmitter can be operated via a HART modem, using a PC or laptop. The HART modem can be connected to the transmitter in
parallel at any point in the signal circuit. Communication between transmitter and modem occurs via FSK signals that are
superimposed on the analog 4 to 20 mA output signal. This modulation occurs without averaging, therefore does not affect the
measuring signal.
Communication between transmitter and PC or laptop is only possible if the signal circuit is set up as shown in the following
figure. The resistance between the connecting point for the FSK modem and the power supply must be at least 250
Ω
(including
internal resistance of the power supply unit). If this value is not achieved within the context of normal installation, an additional
resistor must be used.
WARNING - RISK OF EXPLOSION
NOTICE
