The RM4220 is a strain gage amplifier that can measure up to 350W. It outputs 10V, 0.10V and 4.20mA, and has zero drift adjustment, DIP switches and potentiometer adjustment functions.
The RM4220 amplifier is designed for up to four 350 Ω strain‑gauge transducers and can be mounted on DIN rails. It provides selectable output ranges (+10 V, 0‑10 V, 4‑20 mA) and adjustment via DIP switches and potentiometers, making it service‑friendly with plug‑in terminals.
Technical data include a gain range of 80‑8500, input impedance of 10^10 Ω, power supply of 24 V + 8 V, operating temperature from 0 °C to +70 °C, and a compact housing (115 × 100 × 23 mm, 130 g) made of polyamide. The device also features a 5 kHz 8th‑order filter and IP20 protection.
| Amplifier gain (max) | 8500 |
|---|---|
| Amplifier gain (min) | 80 |
| Output current | 4‑20 mA |
| Output voltage | 0‑10 V or +10 V |
| Input impedance | 10^10 Ω (typ.) |
| Power supply | 24 V + 8 V |
| Operating temperature range | 0 °C … +70 °C |
| Housing material | Polyamide PA |
| Dimensions (L×W×H) | 115 mm × 100 mm × 23 mm |
| Weight | ≈130 g |
| Filter bandwidth (8th order) | 5000 Hz (max) |
| Thermal sensitivity drift | 150 ppm/°C |
It can output +10 V, 0‑10 V, or a 4‑20 mA current loop.
The amplifier is designed for DIN‑rail mounting with a screw terminal connection.
It operates from a 24 V plus 8 V supply.
The typical input impedance is 10^10 Ω.