Sensor calibration is the process of adjusting HVAC sensors to ensure accurate temperature, pressure, and humidity readings within manufacturer specifications. Properly calibrated sensors are essential for system efficiency and occupant comfort. Technicians compare sensor output against known reference values and adjust calibration offsets to correct any deviations.
Technical Details
Common HVAC sensors include thermistors, RTDs (resistance temperature detectors), and pressure transducers. Calibration typically involves comparing sensor readings against a calibrated reference instrument at multiple points across the operating range. Most sensors should maintain accuracy within plus or minus 1-2 degrees Fahrenheit for temperature measurements and plus or minus 2-5% for pressure readings. Calibration should follow equipment manufacturer guidelines and be documented in maintenance records.
Practical Significance
Uncalibrated sensors cause incorrect system operation, leading to reduced comfort, higher energy consumption, and equipment stress. Regular calibration checks during annual maintenance prevent control system drift and maintain AHRI certification compliance. Sensors in critical control loops should be recalibrated every 2-3 years or per manufacturer recommendations.