Pressure switch MDR 1

To determine the pump or compressor run-time, the MDR 1 can be fitted/retro-fitted with an (optional) operating hours counter. The operating hours counter is available as a kit, and can be mounted to the cover in 4 different positions at 90° intervals. This ensures optimum readability. The kit consists of an operating hours counter for 230 V, and a perforated MDR 1 cover with/without On/Off switch. The MDR 1 is fitted as standard with the possibility for pressure difference adjustment. Two adjusting screws permit switching point and hysteresis to be adjusted, whereby the cut-out point is first adjusted via the main pressure spring and then the cut-in point via the pressure difference setting. By selecting a pair of values for cut-in and cut-out pressures, an intersection point is determined in the diagram. If the point lies within the shaded area, this pair of values can be adjusted on the pressure switch. If the point lies outside the shaded area, this pair of values cannot be adjusted on the pressure switch. Example: MDR 1/11 with pressure difference adjustment. With a selected cut-in pressure of 4 bar, the cut-out pressure can be specified and adjusted between 5, 4 and 8 bar using the pressure difference adjustment.