CRESSTO - SH series - datasheet - differential pressure transmitter0 pages
CRESSTO
intelligent differential pressure transmitter
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for liquid and gas media
overpressure endurance
uP signal processing
users SW configuration
analogue, digital and two-state
outputs
supply 5 ÷ 36 V
protection IP65
wide temperature range
display fit-out possibility
These SH pressure transmitters are designed for meassuring of
pressure in gases and liquids. They are applicable in many sectors of
industry, in heating engineering, water-supply engineering, agricultural engineering, construction of machines or in laboratories etc.
The medium being measured may be gases and liquids also
aggressive character. Measured media is in a contact directly with
stainless separation diaphragm, stainless housing and Viton sealing.
Transmitter is connected into the pressure circuit by impulse piping
diameter 6mm, can be used proper screw M12x1,5. In case of bulid
to order is possible to produce treansmitter also with different
connection armature. All components of the transmitter are placed in
robust box from aluminum alloy, which serves as a good mechanical
and electrical protection. Protection suits to IP65. For electrical
connection serves internal terminal block with screws for cable with
metal grommet PG-9. For some outputs can be used also sealed
latched mini connector type DIN 43650 - C with cabel grommet
PG7, witch enables to use cable diameter of max. 6,5mm.
This type of transducer measures the pressure by means of a
silicon diaphragm on a piezoelectric principle. Silicon diaphragm is
separated from measured media by stainless diaphragm and oil
filling. Therefore this transducer attains a good overload endurance
and chemical resistance. Inside SH transmitter are used two
independent pressure sensors, matching to common mode pressure
. Thereby this differential transmitter has high one-side overpressure
endurance and user has got information about common mode
pressure in pressure circuit. Electronic circuitry is realized by a
surface mount technology and for increasing protection is passivated by a coat.
Electrical signals from both sensores are after after amplifying
CRESSTO
SH
converted by 16bit ADC to digital format. By means of
two-dimensional polynomial approximation of 3rd order are obtained
values of pressure which serves to calculate pressure difference
based on special algorithm. With special agreement it is possible to
compensate down to -20°C. Output pressure value can be read
directly via serial port RS485, RS 232 or USB. Transmitter has
special output stage, which convert calculated value to analogue
value 4-20mA (two-wire) or 0-20mA, 0-10V, 0-3V(three-wire).
Particular analogue outputs can be switch by software and it is
possible to change measuring pressure range and set other parameters, for example damping etc. In addition it is possible at analogue
outputs to switch linear conversion characteristics to switching
two-state one and realize logic levels with voltage
output. Transmitters can be fitted with output switching module,
which has small relay with one contact and two independent outputs
with NPN transistors with open collector with LED indication. All
switching parameters can be set only via software. Next option is 4 or
5 digit LCD with white LED back lighting. There is also place for
FLASH memory, where can be stored measured data with desired
period (without timestamps). Transmitters can be supply with DC
voltage with wide range from 5 to 35 Volts. Change in this range has
no effect to measurement accuracy.
Software configuration is realized via special USB adapter with
program for Windows. Transmitter can be supplied from USB and
due to adapter totally DC isolation can be connected to PC whenever
in the final application.
Hasičská 2643, 756 61 Rožnov p. Radh., CZECH REPUBLIC
tel.: +420 571 843 162, 571 845 338, fax: +420 571 842 616
e-mail: firma@cressto.cz
www.CRESSTO.cz