Differential pressure gauge – testo 521-2

The testo 521-2 differential pressure gauge is used to measure differential pressure in air conditioning and ventilation systems. The testo 521-2 is ideal for use in measuring pressure drops on filters or checking fans, etc. This meter is also suitable for Pitot tube measurements in ventilation ducts or in air (with a measuring range of 5 to 100 m/s).

In addition, testo 521-2 also integrates a temperature compensated differential pressure sensor with an accuracy of 0.1 %fv. You can also attach up to 2 additional probes (order option) such as:

Provide cover: Testo 521-2 differential pressure gauge, battery and factory test paper.

Outstanding features of the testo 521-2 differential pressure gauge

Technical specifications of testo 521-2

Temperature – NTC
Measuring range	-40 to +150 °C
Accuracy	±0.2 °C (-10 to +50 °C)* ±0.4 °C* (remaining range)
Resolution	0.1°C

Temperature – NTC

Measuring range

-40 to +150 °C

Accuracy

±0.2 °C (-10 to +50 °C)*

±0.4 °C* (remaining range)

Resolution

0.1°C

*Accuracy information only applies when the probe is not connected

Temperature – TC Type K (NiCr-Ni)
Measuring range	-200 to +1370 °C
Accuracy	±0.4 °C (-100 to +200 °C)* ±1 °C (Remaining range)*
Resolution	0.1°C

Temperature – TC Type K (NiCr-Ni)

Measuring range

-200 to +1370 °C

Accuracy

±0.4 °C (-100 to +200 °C)*

±1 °C (Remaining range)*

Resolution

0.1°C

*Accuracy information only applies when the probe is not connected

Differential pressure (internal sensor) – Piezoresistive
Measuring range	0 to 100 hPa
Accuracy	±0.1 % of fsv
Resolution	0.01 hPa
Static pressure	1000 hPa
Overload	300 hPa
Zeroing	to 2.5 hPa

Differential pressure (external measuring head) – Piezoresistive
Measuring range	0 to 2000 hPa
Accuracy	±0.1 % measured value*
Resolution	0.1 Pa (0638 1347) 0.01 hPa (0638 1547) 0.001 hPa (0638 1447) 0.1 hPa (0638 1847 / 0638 1647)

Differential pressure (external measuring head) – Piezoresistive

Measuring range

0 to 2000 hPa

Accuracy

±0.1 % measured value*

Resolution

0.1 Pa (0638 1347)

0.01 hPa (0638 1547)

0.001 hPa (0638 1447)

0.1 hPa (0638 1847 / 0638 1647)

*Accuracy information only applies when the probe is not connected

Differential pressure (external probe) – Ceramic
Measuring range	-1 to 400 bar
Accuracy	±0.2 % of fsv*
Resolution	0.01 bar

*Accuracy information only applies when the probe is not connected

General specifications
Size	219x68x50mm
Operating temperature	to +50 °C
Structural materials	ABS
Channel number	2 external channels 1 internal channel
Measurement cycle	0.04 seconds
Connect	Hose: inner Ø 4 mm Outer: Ø 6 mm
Battery type	9V (6LR61)
Battery life	Continuous operation w/ internal pressure sensor: 30 h; With rec. battery: 10 h; With carbon battery: 18 h
Screen type	LCD (Liquid Crystal Display)
Display function	7 segment display and point matrix
Display updates	2x per second, in fast measurement 4x per second
Power supply	Battery/Rechargeable battery, 12 V power supply
Interface	RS232
Memory	100 kB; 25,000 measurement values
Storage temperatures	-20 to +70 °C
Weight	300g