EM-M22 TRMS 5A / 1A TO 4...20mA FEATURES • Measures TrueRMS • Input ranges 5A and 1A • Output 4...20mA and 1...5V • Settable gain • Over current protected • Reverse current protected • Easy to connect • Rail mountable EM-M22 is designed for measuring AC current. The device was designed to work with current transformer and as a converter to current signal. The AC current is measured as TrueRMS, in other words the device gives RMS output also from other than sinus shaped signals. The measured current is converted into 4...20mA signal. There are two measuring ranges, 5A and 1A, which are standard current transformer output values. The device takes it’s supply power from current loop and requires no other power supply. The device can also be used as 1...5V signal transducer according to the schematic down low. EM-M22 is efficiently protected from faulty connections and voltage peaks. 79mm 25mm TECHNICAL DATA Supply Measuring range Input impedance Output signal Linearity error Thermal drift Settling time Frequency range Loop resistance Oper. ambient temp. 12...32 Vdc 5AC RMS 20A peak 1AC RMS 4A peak 0.05 ohm / 5A 0.27 ohm / 1A 4...20mA / 1...5V <0.5% (sin) <200ppm/°C 0.3s 45...1000Hz 0-700 ohm ( 24V ) 0...50°C EM-M22 4...20mA OUTPUT 12-32V 4 1 5A in Rin at 5A range = 0.05 ohm Rin at 1A range = 0.27 ohm 6 RL 86mm 1...5V OUTPUT 15-32V 4 RL= 0-700 ohm at 24V supply 1...5V U-out 5 6 ELECTROMEN Oy, Turku, Finland DIN-MOUNTING RAIL WIDTH OF THE HOUSING IS 25MM 1...5V Uout t 12...32V 4 15...32V LARGEST POSSIBLE MEAS. RESISTOR AS A FUNCTION OF OPER. VOLTAGE VCC/V 4 30 TRMS-meas 1AC-IN I-out 5 4...20mA 3 COM. t 1 2 1A in CURRENT TRANSFORMER 4...20mA CURRENT LOOP 5AC-IN AC-CURRENT to 4...20mA CONVERTER 2 i = 4...20mA 0.27 24 0.05 mA-conv. 5 3 LOOP RES. MEAS 5 Uout 1...5V 18 COMMON RL 250 ohm. 6 6 Rin >250k GAIN 12 <100 RL/ohm ELECTROMEN Oy Vähäheikkiläntie 56B, 20810 Turku, FINLAND <400 <700 <1000 RECOMMENDATION <800 ohm Tel. +358-2-4693050 Fax. +358-2-4693052