CEMTROL Microprocessor-controlled measurement and control system Basic housing: for wall and switchboard mounting, 240x160x90mm (WxHxD, protection class IP 65 fitted with 4 slots to accommodate various measuring modules: -Slot 1+2 for control functions. -Slot 3 for measuring amplifier only. -Slot 4 for temperature measurement only, suitable for pH value temperature compensation. All signal inputs are physically separated. Controller action: P, PI, PID Controller output: voltage-free relay output, 3 A at 250 V / 50 Hz. - Pulse duration modulated. - Pulse frequency modulated. - 3 point step. - Continuous 0/4…20 mA signal (optional). Disturbance variable or0/4...20mA available as input signal for slots 1 + 2, ratio input: evaluation of disturbance variable or ratio control adjustable,amplification factor: 0.1 to 10 Alarm: relay output for slots 1...3 as collective alarm, max. and min. value freely adjustable, time delay selectable, max. load 3 A at 250 V / 50 Hz. Current output for measured-value transmission: 0/4...20 mA freely selectable for each slot, spreading of measuring range adjustable, 10 % minimum of the measuring range with any starting point. Display:1 off 13 mm LC display, 1 off 2-line, 16-digit, alphanumerical display, 5 mm digit height. Computer interface: RS 232 standard, RS 485 optional Voltage supply: 115/230 V, 50...60 Hz switchable.