These SH pressure transmitters are 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 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. Transmitter is connected into the pressure circuit by impulse piping diameter 6mm, can be used proper screw M12x1,5. 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. Protection suits to IP65. 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 and chemical resistance. Inside SH transmitter are used two independent pressure sensors, matching to common mode pressure . Thereby this differential transmitter has high one-side overpressure endurance and user has got information about common mode pressure in pressure circuit. Electronic circuitry is realized by a surface mount technology and for increasing
protection is passivated by a coat.
Electrical signals from both sensores are after after amplifying converted by 16bit ADC to digital format. By means of two-dimensional polynomial approximation of 3rd order are obtained values of pressure which serves to calculate pressure difference based on special algorithm. 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.
