CRESSTO - SR series - datasheet - pressure transmitter0 pages

CRESSTO

intelligent pressure transmitter
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overpressure endurance
uP signal processing
users SW configuration
analogue, digital and two-state
outputs
supply 5 ÷ 36 V
robust construction
protection IP65
wide temperature range
display fit-out possibility

These pressure transmitters 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
transmitters can measure overpressure, underpressure compare
with ambient atmosphere or absolute pressure.
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. Connecting screwing has a standard proportion G1/2“. 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 is IP65. The construction of transmitter is self-supporting
and connection by pressure screwing is adequate.
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, is resistant against vibrations and output is independent on
work position. Electronic circuitry is realized by a surface mount
technology and for increasing protection is passivated by a coat.

CRESSTO

SR
Electric signal from sensor is after amplifying converted by 16bit
ADC to digital format. By means of two-dimensional polynomial
approximation of 3rd order transmitter is calibrated and temperature compensated. 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