PRODUCT DESCRIPTION

Features and Benefits

• Volume flow hood for larger swirl outlets for measuring volume flow, temperature and relative humidity
• Impressively light with a weight of 2.9 kg
• Precise measurement even at swirl outlets thanks to integrated volume flow straightener
• Fast set-up, convenient usability and practical functions such as measurement data management and on-site report creation via testo Smart App

The testo 420 volume flow hood for larger air inlets and outlets enables fast and precise compliance with hygiene guidelines and requirements concerning indoor air quality. It provides reliable support with the calculation of the overall volume flow on HVAC systems, for instance in hospitals, office buildings or commercial buildings.

Temperature – NTC
Measuring range: -20 to +60 °C
Accuracy: ±0.5 °C (0 to +60 °C) / ±0.8 °C (-20 to +0 °C)
Resolution: 0.1 °C
Reaction time: 45 s (t₉₀)

Humidity – Capacitive
Measuring range: 0 to 100 %RH
Accuracy: ±1.8 %RH + 3 % of mv at +25 °C (5 to 80 %RH)
Resolution: 0.1 %RH

Differential Pressure – Piezoresistive
Measuring range: -120 to +120 Pa
Accuracy: ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa
Resolution: 0.001 Pa
Reaction time: 1 s (t₉₀)

Volume flow
Measuring range: 50 to 4000 m³/h
Accuracy: ±3 % of mv + 12 m³/h at +22 °C / 1013 hPa (85 to 3500 m³/h)
Reaction time: 1 s (t₉₀)
Resolution: 1 m³/h