The CPD2/20 Precision Barometer is a portable instrument specifically designed and developed for mine ventilation testing. It can measure both local pressure values and the pressure difference between two points. It features high precision, high sensitivity, robust structure, and intrinsic safety. The entire instrument is lightweight, easy to carry, and resistant to general vibrations and collisions, making it an ideal tool for underground ventilation testing.

CPD2/20 Precision Barometer Technical Parameters
Item
Technical Specifications
Measurement Range
0～±200 mbar (absolute); 0～±500 mmH?O (relative)
Resolution
0.1 mbar (absolute pressure measurement); 0.1 mmH?O (relative differential pressure measurement)
Applicable Altitude Range
-1500～+2500 meters (selectable in seven ranges)
Accuracy
Absolute pressure measurement: 0.5 mbar (calibration period three months)
0.1 mbar (field calibration)
Relative differential pressure measurement: 1 mmH?O
Display
Three-and-a-half-digit LCD digital display
Temperature Influence
0.01～0.02 mbar/℃ (absolute pressure measurement)
0.1～0.2 mmH?O (relative differential pressure measurement)
Vibration Resistance of CPD2/20 Precision Barometer: Under normal use, the display change caused by collision or vibration is not greater than
0～0.1 mbar (absolute pressure measurement)
0.1～0.2 mmH?O (relative differential pressure measurement)
Environmental Conditions
Temperature: -10℃～+40℃ Humidity: < 90%
Power Supply: Uses nickel-cadmium alkaline battery pack (12V), which can operate continuously for over 24 hours after each 4-hour charge.
Dimensions
240x130x190 mm3
Weight
3 kg
Note for CPD2/20 Precision Barometer: Instruments with consistent performance are selected and sold in sets, which can largely eliminate temperature effects in relative differential pressure measurements.