Relative pressure transmitter HD404ST

differentialsilicondigital

The HD404ST series of Differential Pressure Transmitters is able to measure relative pressures with respect to the atmosphere or differential pressures up to 1000 Pa. The transmitters use a temperature compensated “micromachined” silicon sensor which exhibits excellent linearity, repeatability and stability over time. The sensor signal at a Modbus-RTU RS485 digital output can be transmitted over long distances with high interference immunity. An optional auto-zero circuit (AZ) periodically equalizes the differential pressure at the sensor inlet and corrects its offset; transmitters equipped with this circuit are insensitive to the mounting position. In addition, the auto-zero circuit compensates for the aging and zero drift of the sensor as the temperature varies, allowing maintenance to be reduced to a minimum. The display option (L) is available, where the pressure is shown on a 4-digit display in the chosen unit of measure. The “square root” (SR) version is useful if the transmitter is connected to a Pitot or Darcy tube, as the output is directly proportional to the speed of the air flow. The SR version with option L allows you to view on the display, in addition to the measured pressure, also the calculated speed of the air flow. It is possible to set the coefficient of the Pitot or Darcy tube used and the parameters for calculating the speed (temperature of the air flow, barometric pressure, differential static pressure inside the pipeline). PRODUCT FEATURES Viewing Modes and signals - Using display, Signal output Explosion protection - Safe zone Zero point calibration - Manual