testo 420 Differential Pressure Manometer

The CEC compliant testo 420 differential pressure measuring instrument is suitable for accurate differential pressure measurement up to 120 Pa, suitable for checking filters in HVAC systems. The testo 420 calculates flow velocity and volume flow. This instrument can also be used for absolute pressure measurement.

Differential Pressure Measuring Instrument with Practical Functions

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, together with simple input of the duct geometry, provide you with accurate flow measurements in ducts.

Automatic zeroing ensures higher accuracy for low pressures. All measuring values are easy to read on the large backlit display.

Documenting the Measurement Data

Measurement data can be stored in the testo 420 for analysis and documentation. It's easy to manage the measurement data on a PC without any additional software, via the testo 420's plug and play capability.

Measuring range	-0.480 to 0.480 InH₂O / -120 to +120 Pa +19.7 to +2756 fpm / +0.1 to +14 m/s
Accuracy	±2 % of mv + 0.002 InH₂O at +72 °F, 405 InH₂O / ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa
Resolution	0.001 InH₂O / 0.001 Pa 0.01 fpm / 0.01 m/s
Reaction time	1 sec (t90)

Measuring range

-0.480 to 0.480 InH₂O / -120 to +120 Pa

+19.7 to +2756 fpm / +0.1 to +14 m/s

Accuracy

±2 % of mv + 0.002 InH₂O at +72 °F, 405 InH₂O / ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa

Resolution

0.001 InH₂O / 0.001 Pa

0.01 fpm / 0.01 m/s

Reaction time

1 sec (t90)

Measuring range	280 to 440 InH₂O / 700 to 1100 hPa
Accuracy	±1 InH₂O / ±3 hPa
Resolution	0.1 InH₂O / 0.1 hPa
Reaction time	1 sec

Measuring range

280 to 440 InH₂O / 700 to 1100 hPa

Accuracy

±1 InH₂O / ±3 hPa

Resolution

0.1 InH₂O / 0.1 hPa

Reaction time

1 sec

Dimensions	6 x 3 x 1 in. / 150 x 85 x 35 mm
Operating temperature	23° to 122 °F / -5 to +50 °C
EU-/EG-guidelines	EU-guideline 2014/30/EU
Battery type	Alkaline, 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)
Storage temperature	-4° to 140 °F / -20 to +60 °C

Dimensions

6 x 3 x 1 in. / 150 x 85 x 35 mm

Operating temperature

23° to 122 °F / -5 to +50 °C

EU-/EG-guidelines

EU-guideline 2014/30/EU

Battery type

Alkaline, 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)

Storage temperature

-4° to 140 °F / -20 to +60 °C

testo 420 - Differential pressure manometer

testo 420 - Differential pressure manometer

Differential Pressure Measuring Instrument with Practical Functions

Documenting the Measurement Data

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General technical data

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