Greystone Energy Systems Inc. is one of North America’s largest ISO registered manufacturers of HVAC sensors and transducers for Building Automation Management Systems. Greystone Energy has conscientiously established a worldwide 
reputation as an industry leader by maintaining leading-edge design technology, prompt technical support, and a commitment to on-time deliveries. We take pride in our Quality Management System which is ISO 9001 certified, assuring our customers of consistent product reliability.
The company’s vision is to design and manufacture a wide range of products for sensing measurement and transmittal of data related to temperature, humidity, 
pressure, current, air quality, and hazardous gases. This vision is being realized through our rigid adherence to quality standards, the efficient service we offer our customers, the genuine pride we take in our work, and our continued quest to advance the state of our industry through research and development.
Product:
- Temperature Sensors
- Temperature Transmitters
- Humidity Transmitters
- Gauge Pressure Transducers
- Differential Pressure Transducers
- Static Pressure Transducers
- Air Flow Transducers
- Current Switches & Sensors
- Analog to Pneumatic (I/P) Transducers
- Signal Conditioning Transmitters
- Proportional Resistive Output Boards
- Pulse Width Modulated Boards
- Power Supplies
- Air Quality Monitor
- Carbon Dioxide Detectors
- Carbon Monoxide Detectors
