Electronic pressure switch 800 Smartstat series

differentialSPDTNO

The Series 800 Smartstat is a microprocessor controlled pressure switch, transmitter and indicator, which enables several instruments to be replaced with a single device. * Pushbutton calibration of set points and transmitter range enables calibration on site without tools. * Programmable switching delays - the switching on or off (or both) of the relays may be delayed from 0.5 seconds to 15 minutes. This is particularly useful for preventing unwanted switching due to temperature transients. * Display of maximum and minimum pressures recorded by the Smartstat. * Display of transmitter output in mA. * Displayed units of measurement - can be changed by the user as required The input pressure applied to the Smartstat is converted to a proportional electrical signal by the silicon pressure sensor. After amplification this signal inputs directly into the analogue to digital (a/d) port on the microprocessor. The microprocessor continuously calculates the pressure from the input signal, compares this to the switch setpoints and operates the relays as required. If the pressure rises above the UPPER switch point the relay changes over from normally closed (NC) to normally open (NO), as the pressure falls below the LOWER switch point the relay changes over from NO to NC.