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Product Data Sheet PDF | Instruction Manual PDF
Description
The Testo 420 differential pressure measuring instrument is engineered for highly efficient filter testing and ventilation duct diagnostics within commercial HVAC complexes. It incorporates a specialized, ultra-precise piezoresistive sensor optimized for low-pressure tracking within a scale of -120 to +120 Pa, featuring an automatic zeroing routine to eliminate drift. When configured with a compatible Pitot tube, the device delivers precise automated profiling for flow velocity and volume flow, utilizing integrated timed or multi-point mean calculation models. A large 3.5-inch illuminated dot-matrix display ensures clarity, while its internal 2 GB plug-and-play memory supports seamless data logging over Micro-USB without external software packages.
Industrial Applications
- Evaluating micro-scale differential pressure drops across heavy industrial ventilation filtration groups
- Conducting precise aerodynamic velocity profiling inside commercial air conditioning ducts via Pitot tube integration
- Performing absolute pressure tracking and duct geometry flow calculations during HVAC commissioning
Technical Specifications
| Parameter | Value |
| Differential Pressure Range | -120 to +120 Pa |
| Differential Pressure Accuracy | ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa |
| Flow Velocity Range | +0.1 to +14 m/s |
| Absolute Pressure Range | 700 to 1100 hPa |
| Internal Logging Storage | 2 GB (Plug and Play Micro-USB data access) |
| Display Configuration | 3.5 inch illuminated dot matrix |
Package Contents
- Testo 420 differential pressure instrument
- AA batteries
- Calibration protocol