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Use the testo 420 differential pressure measuring instrument to carry out simple, efficient tests on filters. You can also use the measuring instrument in conjunction with a Pitot tube to measure flow velocity and volume flow really easily in ventilation ducts.
The testo 420 differential pressure measuring instrument is suitable for accurate differential pressure measurement up to 120 Pa, e.g. when checking filters in HVAC systems. Flow velocity and volume flow are calculated by the testo 420. The measuring instrument can also be used for absolute pressure measurement.
You can use a Pitot tube and compatible connection hoses (both optional) to measure the flow velocity and volume flow in ventilation ducts. Timed and multi-point mean calculation, as well as the combination of the two, along with simple input of the duct geometry provide you with support for measurements in ducts.
The automatic zeroing ensures higher accuracy for low pressures. All measuring values are easy to read on the large display which has an illumination function.
Documenting the measurement data
Measurement data can be stored in the differential pressure measuring instrument for analyses and documentation. It's easy to manage the measurement data on the PC without any additional software, via the plug & play function.
| Sensor | ||
| Differential Pressure - Piezoresistive | Absolute Pressure | |
| Measuring range | -120 to +120 Pa +0.1 to +14 m/s |
700 to 1100 hPa |
| Accuracy | ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa | ±3 hPa |
| Resolution | 0.001 Pa 0.01 m/s |
0.1 hPa |
| Reaction time | 1 s (t₉₀) | 1 s |
| General technical data | |
| Operating temperature | -5 to +50 °C |
| Storage temperature | -20 to +60 °C |
| EU-/EG-guidelines | EU-guideline 2014/30/EU |
| Battery type | Alkali manganese, mignon, type AA |
| Battery life | 40 h |
| Display size | 3.5" |
| Display function | Dot matrix |
| Display ligthing | with illumination |
| Interface | Micro-USB |
| Memory | 2 GB (internal) |
| Dimensions | 150 x 85 x 35 mm |
Buy with 100% confidence knowing your purchase is backed by the full Manufacturer's Warranty. Please register your product with provided warranty card.
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This includes multiple products up to 5kg only.
Additional cost applies for orders over 5kg. Contact us for quotation.
