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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, 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.
