CRESSTO - Z series - datasheet - pressure transmitter0 pages

CRESSTO

pressure transmitter

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Z

small dimensions
simple application
universal usage
wide selection
favourable price

The transducers series Z are designed for a general use. They are
capable to measure both the positive and negative pressure in the
liquids and gases that are not chemically aggressive. The differential
transducers are designed just for the non-aggressive gases.
These transducers series Z will find a wide use in a full scale of the
industrial automation, power measurements, sanitary technology,
agricultural applications. Their availability and small dimensions make
them popular for a device design, for laboratory measurements, etc.
The transducer case is made from duralumin with the colorless eloxal
surface finish. The connecting thread proper has a dimension
M12x1.5. This transducer may be ordered with a thread G1/2“ or
M20x1.5. This is realized by a fix installation of a special reduction
immediately at the manufacturer. This case has a diameter 39 mm
and includes all circuits that are necessary for a function of this
transducer.
As a pressure sensing element in this series of transducers, there
may be used two types of piezoelectric sensors – silicon or ceramic
ones. As for the pressure ranges, the silicon diaphragms are determined for the lower pressures and the ceramic ones for the higher
pressures, see the engineering data on the second page of this sheet.
Unlike the ceramic sensors, diaphragm of the silicon sensors is not
galvanically separated from the power supplies, however, it is
possible to reach a higher pressure overload capacity. The ceramic
membranes are convenient only for the relative and absolute pressure measurement and because of their high chemical resistance, they
may be recommended for applications in the heating and water-supply engineering. As for the sensor with a silicon diaphragm, the
medium being measured is in a contact with the following materials:
duralumin, silicon, Viton, silicone rubber, polyetherimide; for the
ceramic diaphragm version, those materials are: duralumin,

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corundum ceramics, Viton.
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. The case body
is not electrically connected with the system but it is connected to
the earthing pin of the connector. We recommend to connect always
this pin 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.
Electric signal from the sensor, which is proportional to the pressure
applied, is amplified, filtered, calibrated and transferred to the
required output quantity. The pressure transducers series Z are
commonly manufactured with the current outputs 4÷20 mA
(two-wire) or 0 - 20 mA (three-wire) and the voltage output 0 – 10 V.
If agreed, it is possible to set different values, namely for the voltage
outputs. The transducers may be supplied by a DC voltage in the
range 12 – 36 V. Change of the supply voltage in this range has no
actual influence on the measurement accuracy. Calibration of this
transducer is performed using the fixed resistors. A possible fine
adjustment of the transfer characteristic limit points may be done by
two multi-rotation trimmers, which may be used for corrections
within 2 % of the nominal range.

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