The Belimo 22RTM-5800D is a wall-mount active room sensor measuring CO2, Relative Humidity, Dew Point, and Temperature with NFC commissioning for tap-and-configure setup via the Belimo Assistant App and an MP-Bus channel for digital network integration. The high-contrast ePaper touch display (2.72 x 2.44 inch) provides on-device readout of all measured values and direct setpoint adjustment by the occupant — no smartphone required. The sleek white (RAL 9003) housing matches commercial interior finishes and mounts to a single-gang box or flat to drywall.
Key Features
NFC Commissioning
Tap a smartphone with the Belimo Assistant App to read or write any configuration parameter — output scaling, measuring ranges, setpoint limits — without connecting to a panel or BAS. Slashes commissioning time on multi-room installations.
MP-Bus Digital Channel
In addition to analog outputs, the device acts as a node on Belimo's MP-Bus network (up to 8 standard or 16 special nodes per master), allowing digital readout and configuration from compatible Belimo controllers.
ePaper Touch Display
2.72 x 2.44 inch high-contrast ePaper touch screen shows live values for all measured parameters. Occupants tap directly on the display to nudge the temperature setpoint. Optional 4-digit access code blocks unauthorized adjustments.
Selectable V or 4-20 mA Outputs
Each analog channel can be configured for 0-5 V, 0-10 V, 2-10 V, or 4-20 mA via the Belimo Assistant 2 app — drop into any controller, including legacy current-loop systems and long-cable-run installations.
NDIR Dual-Channel CO2 Sensor
Non-dispersive infrared dual-channel CO2 element compensates for sensor aging without requiring weekly fresh-air calibration (ABC logic). Suitable for 24/7 occupancy applications. Recommended recalibration after 5 years.
Capacitive Humidity Sensor
Long-term-stable capacitive RH element with ±2% accuracy between 0-90% RH at 25°C and ±0.25% RH/year drift. Dew point is calculated and provided as an additional measured value.
Configurable Setpoint Range
Define how far the occupant can shift the setpoint above or below the BAS schedule. All limits, scaling, and offsets are configurable via the Belimo Assistant App or BAS object writes — no DIP switches, no jumpers.
Universal 24 V Power
AC/DC 24 V (19.2-28.8 V) supply tolerance. Spring-loaded terminals accept 0.25-1.5 mm² conductors with back, top, or bottom cable entry — flexible mounting for both new construction and retrofit.
Technical Specifications
| Specification | |
|---|---|
| Measured Values | CO2, Relative Humidity, Dew Point, Temperature |
| Output Signal | 3x Selectable 0-5 V / 0-10 V / 2-10 V or 4-20 mA (Belimo Assistant 2 selectable) |
| Communication | NFC + MP-Bus |
| Temperature Range | 32...122°F [0...50°C] (default, configurable) |
| Temperature Accuracy | ±0.3°C @ 25°C [±0.5°F @ 77°F] |
| Humidity Range | 0...100% RH (default, configurable) |
| Humidity Accuracy | ±2% between 0...90% RH @ 77°F [25°C] |
| Humidity Long-Term Stability | ±0.25% RH per year |
| Dew Point Range | -58...122°F [-50...50°C] |
| CO2 Sensor Technology | NDIR (Non-Dispersive Infrared) Dual-Channel |
| CO2 Range | 0...2000 ppm (default, configurable) |
| CO2 Accuracy | ±(50 ppm + 2% of measured value) |
| CO2 Long-Term Stability | ±20 ppm per year |
| Display | ePaper Touch Display + LED |
| Setpoint Adjustment | Yes (via Display App or ePaper touch) |
| Nominal Voltage | AC/DC 24 V |
| Voltage Range | 19.2...28.8 V (AC or DC) |
| Power Consumption | Max 1 VA AC / 0.5 W DC (V output); Max 4 VA AC / 2 W DC (mA output) |
| Electrical Connection | Spring-loaded terminal 0.25-1.5 mm² |
| Cable Entry | Back, top, and bottom side |
| Housing | PC, white, RAL 9003 |
| Protection | IP30 / NEMA 1 |
| Ambient Temperature | 32...122°F [0...50°C] |
| Ambient Humidity | Max 95% RH, non-condensing |
| Storage Temperature | -40...160°F [-40...70°C] |
| Display Size | 2.72 x 2.44 in [69 x 62 mm] ePaper touch |
| Certifications | UL/cULus per UL60730-1, IEC/EN 60730-1, CE, ISO 9001 |
| Warranty | 5 Years |
Documentation
Frequently Asked Questions
What does the 22RTM-5800D actually measure?
The 22RTM-5800D measures co2, relative humidity, dew point, temperature (calculated). All values are available simultaneously over nfc + mp-bus.
How do I switch the analog outputs between voltage and 4-20 mA?
Use the Belimo Assistant 2 mobile app over NFC. Select the channel, choose 0-5 V, 0-10 V, 2-10 V, or 4-20 mA, and write back to the device. No DIP switches or jumpers — and no need to open the housing.
How does the occupant change the setpoint?
The ePaper touch display shows the current setpoint and accepts touch input directly on the device. An optional 4-digit access code can be enabled to prevent unauthorized changes, and the BAS can constrain how far the setpoint may deviate from the schedule.
Does the CO2 sensor need regular calibration?
The CO2 element uses NDIR dual-channel technology, which compensates for component aging using a sealed reference duct — fresh-air ABC calibration is not required. This makes it suitable for 24/7 occupied spaces where ABC sensors would never see clean outdoor air. Recalibration is recommended after 5 years.
What's the power draw?
Up to 1 VA AC or 0.5 W DC when configured for V output, and up to 4 VA AC or 2 W DC when configured for 4-20 mA output (each loop draws 20 mA continuously). Spec the 24 V transformer accordingly when using current-loop outputs.
How does this mount?
PC housing in white RAL 9003 mounts directly to a single-gang electrical box (back-side cable entry) or flat to drywall (top or bottom cable entry). Spring-loaded terminals accept 0.25-1.5 mm² conductors — no screws to overtighten.
