1. Introducció
This manual provides detailed instructions for the installation, operation, and maintenance of the Watt Stopper UT-305-3 Ultrasonic Ceiling Occupancy Sensor. This device is designed to detect occupancy in a 360-degree field of view, covering up to 2000 square feet, and control lighting loads based on occupancy. It utilizes ultrasonic technology for reliable detection and operates on a 24 VDC power supply.
Please read this manual thoroughly before installation and operation to ensure proper functioning and safety.
2. Informació de seguretat
- La instal·lació l'ha de dur a terme un electricista qualificat d'acord amb tots els codis elèctrics nacionals i locals.
- Disconnect power at the circuit breaker or fuse box before installing or servicing the sensor.
- Do not install in locations where the operating temperature exceeds the specified range.
- Ensure the sensor is connected to a Watt Stopper Class 2 power supply as specified.
3. Producte acabatview i Característiques
The Watt Stopper UT-305-3 is an advanced ultrasonic occupancy sensor designed for ceiling mount applications. Its key features include:
- Cobertura de 360 graus: Provides comprehensive occupancy detection in a circular area.
- Cobertura de grans àrees: Detects motion up to 2000 square feet.
- Tecnologia ultrasònica: Emits high-frequency sound waves (40kHz) to detect occupancy, suitable for areas with obstructions.
- Retard de temps ajustable: Fixed time delay settings of 5, 10, 15, 20, or 30 minutes before lights turn off after an area becomes vacant.
- Isolated Relay: Provides a dry contact output for lighting load control.
- Disseny de muntatge al sostre: Discreet and effective for overhead installation.

Figura 1: Davant view of the Watt Stopper UT-305-3 Ultrasonic Ceiling Occupancy Sensor. This image shows the white, circular housing with the ultrasonic transducer visible in the center, designed for discreet ceiling installation.
4. Configuració i instal·lació
The UT-305-3 sensor is designed for ceiling mounting. Follow these general steps for installation:
- Desconnexió d'alimentació: Ensure all power to the installation area is turned off at the circuit breaker.
- Lloc de muntatge: Select a central ceiling location within the desired coverage area (up to 2000 sq ft). Avoid placing the sensor directly above heat sources or in areas with significant air currents that could cause false detections.
- Cablejat: Connect the sensor to a Watt Stopper Class 2 power supply (24 VDC) according to the wiring diagram provided with the power supply. The sensor provides an isolated relay output for controlling the lighting load.
- Muntatge del sensor: Securely mount the sensor to the ceiling using appropriate hardware. The sensor has a compact design with dimensions of approximately 4.5 inches diameter and 1.02 inches height.
- Restauració i proves d'energia: Once wiring and mounting are complete, restore power and test the sensor's functionality.

Figura 2: Packaging for the Watt Stopper UT-305-3 sensor. The label clearly displays the model number UT-305-3, 360-degree occupancy sensor, 40kHz, 2000ft² coverage, and the UPC 00754182915194, confirming product details.
5. Instruccions de funcionament
The UT-305-3 sensor operates automatically once installed and powered. It continuously monitors the area for occupancy using ultrasonic technology.
- Detecció d'ocupació: When occupancy is detected, the sensor activates its internal relay, which in turn controls the connected lighting load, turning the lights ON.
- Vacancy Detection: When the area becomes vacant and no motion is detected for the duration of the set time delay, the sensor deactivates its relay, turning the lights OFF.
- Time Delay Adjustment: The sensor features fixed time delay settings (5, 10, 15, 20, or 30 minutes). Refer to the specific instructions provided with your Watt Stopper Class 2 power supply or the sensor's detailed wiring diagram for how to select the desired time delay.
6. Manteniment
The Watt Stopper UT-305-3 sensor requires minimal maintenance to ensure optimal performance.
- Neteja: Netegeu periòdicament la superfície del sensor amb un drap suau i sec per eliminar la pols o les restes. No utilitzeu productes de neteja abrasius ni dissolvents.
- Inspecció: Annually inspect the sensor and its wiring for any signs of damage or loose connections.
- Obstruccions: Ensure that there are no new obstructions (e.g., tall furniture, partitions) that could block the ultrasonic signals and reduce detection coverage.
7. Solució De Problemes
Si el sensor no funciona com s'espera, tingueu en compte els problemes i solucions habituals següents:
| Problema | Causa possible | Solució |
|---|---|---|
| Lights do not turn ON with occupancy. | No power to sensor; Incorrect wiring; Sensor malfunction. | Check power supply and connections; Verify wiring against diagram; Contact support if issue persists. |
| Lights remain ON or turn OFF too quickly. | Incorrect time delay setting; Obstructions blocking detection; Sensor sensitivity issue. | Adjust time delay setting; Remove obstructions; Ensure sensor is properly positioned. |
| False detections (lights turn ON without occupancy). | Air currents (HVAC vents); Vibrations; Sensor too sensitive. | Relocate sensor away from air currents; Check for sources of vibration; Consult advanced settings if available. |
If troubleshooting steps do not resolve the issue, contact Watt Stopper technical support.
8. Especificacions
| Característica | Detall |
|---|---|
| Número de model | UT-305-3 |
| Marca | Watt Stopper |
| Tecnologia | Ultrasonic (40kHz) |
| Àrea de cobertura | 2000 sq ft (360-degree) |
| Font d'alimentació | 24 VDC (Corded Electric) |
| Tipus de muntatge | Muntatge al sostre |
| Retard de temps | Fixed: 5, 10, 15, 20, 30 minutes |
| Sortida | Isolated Relay for Lighting Load |
| Dimensions (D x H) | 4.5 polzades x 1.02 polzades |
| Pes | 6.6 unces |
| Color | Blanc |
| Dispositius compatibles | BAS, HVAC, Lighting Controls |
| UPC | 754182915194 |
9. Garantia i Suport
For warranty information, please refer to the documentation included with your purchase or visit the official Watt Stopper weblloc. Els termes i condicions de la garantia poden variar.
For technical support, product inquiries, or service, please contact Watt Stopper directly through their official customer support channels. Contact information can typically be found on their weblloc o embalatge del producte.





