Ultrasonic vs. PIR Sensors: Which Is Best for Your Workplace?
Want to use occupancy sensors in your office, but unsure where to start? Learn the difference between PIR and ultrasonic sensors to make an informed decision.
Updated March 6, 2023.
Are you looking for simple ways to optimize your office space? Perhaps you want to start by automating certain processes, so you're looking to install an indoor motion detection system to control temperature, lighting, and ventilation.
Your research has led you to sensor-based technologies in the workplace, specifically PIR (passive infrared) and ultrasonic sensors. Both are perfect workspace occupancy sensors that adjust the office parameters based on the number of people in the space, so how do you choose?
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Distinguishing Between PIR and Ultrasonic Sensors
This article highlights the difference between PIR and ultrasonic sensors by analyzing aspects such as:
- Type of measurement
- Detection range
- Ideal office layout
PIR Sensors
PIR sensors measure the infrared radiation emitted from an object. The sensor has two slots. When inactive, both slots have the same reading (e.g., the temperature of the room). The sensor is activated when one slot's reading changes (e.g., a person walking past the sensor).
PIR sensors are easily mounted, affordable, and use little power. Their range varies depending on whether it's an indoor (10 inches to 65 feet) or outdoor sensor (30-500 feet). Consider using these sensors in an open-plan office or where individual desk space takes precedence (e.g., coworking spaces).
Ultrasonic Sensors
Ultrasonic sensors use ultrasonic sound waves to measure the distance to a specific object. It has a transmitter that creates sound and a receiver that detects its echo, thereby using the time it takes the sound to travel to determine distance. Through proximity detection, ultrasonic sensors can determine a space's "normal" condition and registers motion when this condition changes.
These sensors are reliable and versatile with a varying range of a few inches to 70 feet. Consider using ultrasonic sensors if your office contains many structures (e.g., cubicles) as these sensors are effective at detecting motion around corners.
Select Based on Your Needs
When deciding on a suitable sensor for your workplace, there are a few factors to consider:
- Make sure the sensor has all the necessary features to achieve what you want.
- Choose a sensor within your budget.
- Check the sensor's usability and how complicated it will be to install and use.
Ultimately, the choice depends on your organizational needs. Don't invest in equipment that's not aligned with your needs.
■ Sensors contribute to a more sustainable workspace: Consider the importance of a green workspace
