These transmitters can be used both in the medium with occurrence of flammable dust or methane, eg. especially in mines, and also in gas or chemical industry. They are approved by an accredited laboratory in versions I M1 Ex ia I Ma or II1G Ex ia IIB T4 Ga, or II1D Ex ia IIIC T135° Da.
The transmitters series Z are intended for universal use. By means of them it is possible to measure both overpressure and underpressure in liquid and gas media which is not chemically aggressive. The absolute version enables pressure measuring against vacuum and thus also includes measuring of barometric air pressure. Differential transmitters are intended only for gas non-aggressive media.
Transmitters of this series have wide use in the whole scale of applications in industrial automation, power system measuring, mining. Because of their accessibility and small dimensions, they are popular in device constructions, for measuring in laboratories, etc.
The transmitter casing is made from brass with nickel coating. The transmitters can be supplied with connecting threads M12x1.5, G1/4”, M20x1.5 or G1/2”.
For the actual pressure sensing with this transmitter series, it is possible to use two types of piezoelectric sensors – silicon or ceramic. From the point of view of pressure ranges, silicon membranes are intended for lower pressures and ceramic for higher ones, see the technical data on the second page of this sheet. Silicon sensors do not have, contrary to the ceramic ones, the measuring membrane galvanically separated from the power supply, but it is possible to achieve higher overload capacity. Ceramic sensors are suitable only for relative and absolute pressure measuring. With transmitters with a silicon membrane the measured medium is in contact with these materials: nickel coating
brass, silicon, Viton, silicon rubber, Polyetherimid; for the version with a ceramic membrane they are: nickel coating brass, corundum ceramics, Viton.
Modern elements, surface mounting technology, etc are used in the transmitter construction. The casing material is not electrically connected with the system, but is connected to the earth pin of the connector. The electronics is passivated by a double layer of varnish. Electric connection is made by means of a sealed arrested connector (ISO 4400/6952 – DIN 43650) with a cable bushing size PG9, which enables connection by a cable with the dimension 6÷9 mm.
Electric signal from the sensor, which is proportional to the applied pressure, is strengthened, calibrated and transferred to the required output quantity. Pressure transmitters series Z are mass-produced with current outputs 4÷20mA in two-conductor connection or with a special range 0.2÷1mA in three-conductor connection. For the power supply of the transmitters it is possible to use direct-current voltage in the range 10÷22V. Changing the power supply voltage in this range does not have a practical influence on the measurement accuracy. Calibration of the transmitter is made by fixed resistors, two multi-revolution trimers are accessible after unscrewing the connector base for possible fine adjustment of the end points of the transfer characteristic, which can be used for corrections in the range of ca. 2% of the nominal range. The trimer for adjusting the beginning of the range (zero) is marked red.
We recommend to use standardized pressure ranges, see the second page of this sheet, but based on an agreement it is possible to adjust any range in the range of stated pressures and outputs, including symmetric and asymmetric combinations underpressure-overpressure.
