EM-M21A is a multiscale converter for thermal transducer Pt-100. Pt-100 transducer is connected to converter with three wires. In this way the cable resistance is compensated. The converter has four selectable temperature ranges and a -50 °C settable offset. The gain and zero adjustments have no mutual effect. The output signal is 4...20 mA current signal, and the unlinearity of the Pt-100 is already corrected in the converter. The converter acquires its operating voltage from the current loop and needs no additional supply. EM-M21A can be connected as a voltage transmitter 1...5 V according to the figure below. Converter is efficiently protected against misconnections and voltage surges.
| TECHNICAL DATA | |
|---|---|
| Supply | 12...32 Vdc |
| Temperature Ranges | 0...100 °C |
| 0...200 °C | |
| 0...300 °C | |
| 0...400 °C | |
| -50...+50 °C | |
| -50...+150 °C | |
| -50...+250 °C | |
| -50...+350 °C | |
| Output Signal | 4...20 mA / 1...5 V |
| Linearity Error | < 0.1 % |
| Thermal Drift | < 100 ppm/°C |
| Cable Compensation | 0.1 %/10 ohm (Rc) |
| Transducer Supply | approx. 1 mA |
| Loop Resistance | 0...700 ohm (24 V) |
| Oper. Ambient Temp. | 0...60 °C |
