MU-Digital
Differential Pressure Transmitter with LCD Display
Rixen's best-selling transmitter for cleanroom, ventilation, and HVAC applications. Three outputs as standard — 4–20 mA, 0–20 mA, and 0–10 V — for direct connection to BMS, SCADA, and building automation. Mechanical ring balance measuring path: no drift, no readjustment required. 3½-digit LCD for on-site verification.
- BMS/SCADA integration: 4–20 mA · 0–20 mA · 0–10 V — all three standard
- No drift — no diaphragm, no spring, no pressure-stressed components that can age
- No readjustment — readings do not drift out of spec
- Mechanical low-pass at small spans — steady 4–20 mA output, no damping parameters required in the controller
- 3½-digit LCD for commissioning and on-site spot-checks
- Supply selected at order: 24 VAC / 110 VAC / 230 VAC / 24 VDC
Scale and unit are printed at manufacture and cannot be changed afterwards.
All three outputs (4–20 mA · 0–20 mA · 0–10 V) are standard regardless of supply choice.
* Required at order time — cannot be changed afterwards
The transmitter that still reads correctly after ten years
In cleanrooms and ventilation systems, the MU-Digital typically runs in the background: the 4–20 mA signal feeds the BMS, the value appears in the control system — no one needs a local readout for day-to-day operation. What matters is that the signal stays stable over years. Electronic differential pressure sensors (diaphragm, piezo, capacitive) have documented drift rates of 0.2 to 1 % FS per year and require periodic recalibration. The MU-Digital measures mechanically: the pressure measurement itself contains no diaphragm, no spring, and no pressure-stressed components that can age, fatigue, or become brittle — the Hall sensor reads only the rotation angle of the ring body, not the pressure.
For GMP plants and ISO 14644 environments this means concretely: calibration history typically shows no deviations, enabling significantly extended intervals under ISO 9001 and GMP Annex 1 — fewer OOS events, less validation effort during routine checks.
The LCD display is a useful bonus: during commissioning the reading is visible directly at the device, without a laptop or test instrument. In operation it serves for quick spot-checks. Those who need no local display at all can choose the MU-Analog-65 — identical measuring element, identical outputs, analogue scale instead of LCD.
