The DMS-20PC-4/20 Series are the world's first loop-powered digital panel meters with a large, easy-to-read, bright red, LED display. All operating power is derived directly from the loop current itself—no external power supply is required!
The DMS-20PC-4/20 Series are loop‑powered digital panel meters with a bright red 3% digit LED display. They draw all operating power from the 4‑20 mA current loop, eliminating the need for an external supply, and feature vibration‑resistant screw‑terminal inputs, 20‑turn span and zero adjustments, and selectable DIP‑switch ranges.
This manual covers performance specifications, mechanical dimensions, wiring diagrams, DIP‑switch settings, and step‑by‑step calibration procedures for the unipolar (S), bipolar (B), and positive‑reading (P) models, as well as ordering information for optional accessories such as bezel assemblies and power‑supply modules.
| Full Scale Input Range | +4 – +20 mA |
|---|---|
| Input Impedance | 250 Ω |
| Maximum Loop Voltage Drop | 5.0 V |
| Sampling Rate | 2.5 readings per second |
| Accuracy (1 min warm‑up) | ±0.05 %FS + 1 Count |
| Operating Temperature | 0 – +60 °C |
| Weight | 0.6 oz (17 g) |
| Case Material | Polycarbonate |
Select the appropriate DIP‑switch setting from the tables in the manual, then set the small actuators firmly to the ON or OFF positions before adjusting the span (R7) and zero (R3) potentiometers.
The total maximum loop voltage drop is limited to 5 V.