Cressto A series - datasheet - pressure transmitter with ceramic membrane0 pages
CRESSTO
pressure transmitter with ceramic measuring membrane
•
•
•
•
•
A
high chemical resistance
simple application
universal usage
high stability
favourable price
The transducers series A are designed for a general use. They
are capable to measure both the positive and negative pressure
in the liquids and gases that can be partially chemically aggressive. These transducers series A will find a wide use in a full
scale of the industrial automation, power measurements,
heating technology, agricultural applications.
The transducer case is made from stainless steel with high
chemical resistance. Connecting thread proper has a dimension G1/2” or M20x1.5. Special design connection with open
membrane is suitable for media with high viscosity and contamination. This solution has advantage in cleaning this membrane from residues of media. The second advantage is faster
dynamic response and it’s recommended for measuring fast
pressure shocks.
As a pressure-sensing element in this series of transducers,
there are used piezoelectric sensors on ceramic membrane.
Measuring system is created by thick-film technology and is
adjusted during production by laser beam. With proper supply is
output signal equal to input pressure. This sensor is sealed in
stainless steel by “O” ring from Viton.
Small signal from sensor is amplified, compensated and
calibrated by electronics, which is based inside the transmitter
case. This transmitters are produced with two-wire current
output 4 ÷ 20 mA, three-wire current output 0 ÷ 20 mA and
three-wire voltage output 0 ÷ 10 V. Nominal supply voltage is 24
V DC, but they can operate from 12 to 36 V DC without influence on accuracy. The transmitter has a protection from changing
polarity of supply voltage. Calibration is provided through
CRESSTO
laser-trimmed-thick-film resistors and for slight change of
transfer characteristics end-points are used two small multi-rotation trim pots under connector cover. Correction range is ±2 %
form nominal range, approximately. Trim pot for zero-correction
is signed by red colour.
The transducer design uses new modern elements, surface
mount technology, etc. A special care is taken of the resistance
against the outer electromagnetic and electrostatic interference.
On bottom side of connector base is placed special filter and
protection circuit. The case body is not electrically connected
with the system but it is connected to the earthing pin of the
connector. We recommend connection of this pin always to the
fixed potential, especially with a view to achieving satisfactory
immunity against the outer electromagnetic interference. Electric
connection is realized by means of the sealed arrested connector (ISO 4400/6952 – DIN 43650) with a cable bushing PG9,
which enables to connect the transducer by means of the cable
with a diameter 6 – 9 mm.
If agreed, it is possible to set different input pressure values and
/or output electrical values, namely for the voltage outputs.
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