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Universal Single- and Double-channels Transmitters to DIN Rail with HART Communication
P5335
Universal Single- and Double-channels Transmitters
to DIN Rail with HART Communication
3.1 Application
Transmitters P5335 can be used to convert resistance or
voltage temperature signals from resistance or thermocouple
temperature sensors into linearised current output signals of
a current loop 4 to 20 mA with digital communication HART.
Transmitters P5335 include galvanic isolation of input and
output and can be also used for applications with many
measuring points and for thermocouples. High measurement
accuracy and the option of calculations of differences or
averages from two input sensors predetermine use of the
instrument in the most demanding applications.
3.2 Description
The transmitter P5335 can be ordered in two alternatives,
single- or double-channel version for installation on a DIN rail. In
both alternatives this includes a box with removable terminals.
These are available as spring or threaded terminals or threaded
terminals with a compensation terminal for measurement of
thermocouples (see the ordering table. Individual terminals are
fitted with locks for unique determination of position.
Input signals are processed by an A/D converter and converted
into a digital signal that is transferred to a microcomputer
and according to the preset configuration all the measured
values are calculated. These values are then used for further
calculation of a primary quantity (temperature) and according
to the preset range also the output current. Other quantities are
accessible through digital communication HART.
One resistance sensor (two-, three- or four-wire) or two sensors
(two-wire) can be connected to the input. Resistance of the
input wires of the two-wire connection can be compensated
by entering a constant value of the loop resistance when
configuring the transmitter, even for two resistance sensors.
In other cases the resistance of input wires is compensated
automatically. In case of three- and four-wire connection there
can be entered the maximal values of resistance of the line
and the measured resistance of the line is then compared
during measurement. A thermocouple can also be connected
to the input. Compensation of temperature of the comparative
thermocouple connection is carried out according to the
configuration, by a constant temperature of the cold end,
external sensor Pt100 or Ni100 or using a compensation
terminal for measurement of the thermocouple. The
compensation terminal includes a built-in sensor Pt100A and is
designed for direct connection of an extension or compensation
line. The compensation terminal is included in designs P5335
L10 and L20 and can be ordered independently, separately for
each channel (code CTB, see the ordering table).
The transmitter provides analog output signal of the current
loop 4 to 20 mA with HART digital communication. The current
output can be also used for tests of the current loop and the
associated apparatus. The transmitter allows connecting
more instruments on one current loop - multidrop mode. For
the mode multidrop it is necessary to set and unique address
within the range 1 to 15 within the common loop. In this mode
the analog output of the transmitter is constant (4 mA) and
the measured quantities can be obtained only through digital
communication HART.
The transmitter can be configured using the tools that are
usual for the interface HART. Such configuration can be carried
out e.g. using a manual HART configurator or using a PC with
a programme and HART modem.
3. Product description
• Universal input for all common resistance and thermocouple
temperature sensors, linear resistance and mV
• Accuracy 0.05 %
• Measurement of difference or average
of two sensors
• Current output signal 4 to 20 mA
with HART communication
• Galvanic isolation 1.5 kVAC
• Removable spring or screw terminals
• Width from 12 mm per channel
• High immunity against interference
(industrial environment)
• Intrinsically safe version
II (1) G [Ex ia Ga] IIC,
II (1) D [Ex ia Da] IIIC
