Offering high overload safety, the S4540 pressure switch from tecsis can switch a load based on a pressure difference. It withstands 16 bar overload and 25 bar burst pressure. The switching point can be easily set with an adjustment knob between 10 and 100 % of the full range, which may vary from 0.6 up to 6 bar. Featuring a 2% typical hysteresis, the switch is available as NO or NC version. It suits HVAC, filter and flow control, and other building automation applications. In addition the company offers the robust S1510 electronic differential pressure switch that switches the connected loads, based on the pressure difference, using two relays or MOSFET outputs. The measured pressure difference can be displayed on an integrated 3½ digit LED. In addition the device provides an analogue output signal (0-10V or 0/4-20 mA), which can be damped, spread, inverted or linearly transformed. The device has a high accuracy of 0.8 %, typical, of the adjustment range. The switching point and the output signal can be easily programmed with three keys at the front. The switch can be used in applications, where in addition to the switching function, the pressure values have to be monitored.