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testo 521-1 - differential pressure measuring instrument (0.2 % of f.v.)

Order-Nr. 0560 5210

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Integrated differential pressure sensor with an accuracy of 0.2 % of f.v.
Calculation of the flow velocity and the volume flow via Pitot tube (optional)
Multi-point and timed mean calculation
2 probe inputs for additional pressure and temperature probes

The high-precision testo 521-1 differential pressure measuring instrument is ideal for accurate differential pressure measurements in air conditioning and ventilation technology, for instance for pressure drop on filters, checking fans and extractors or for Pitot tube measurements.

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Product Description

The testo 521-1 differential pressure measuring instrument is targeted at precise differential pressure measurements in air conditioning and ventilation technology. It is excellent for use in measuring the pressure drop on filters and in checking fans and extractors. The measuring instrument is also suitable for Pitot tube measurements in ventilation ducts or in process air (in the 5 to 100 m/s range).

The differential pressure measuring instrument has an integrated temperature-compensated differential pressure sensor which measures with an accuracy of 0.2 % of f.v. In addition, you can attach up to 2 further optional probes to the measuring instrument. This means you can flexibly adapt the differential pressure measuring instrument to your application. You have the choice of the following probes:

Differential pressure probes
Absolute pressure probes
Relative pressure probes
Temperature probes (e.g. surface probes or immersion and penetration probes)

The practical features of the testo 521-1 differential pressure measuring instrument

The integrated differential pressure sensor enables the testo 521-1 measuring instrument to calculate flow velocity and volume flow using a Pitot tube (which can be ordered separately). The differential pressure measuring instrument also offers timed and multi-point mean calculation.

Furthermore, long-term monitoring is possible: in doing this, measurement data can be saved individually or as a series of measurements. The measurement rate and the number of values to be saved can be selected by the user. Dynamic measurements can be saved in the measuring instrument in the measuring cycle of 0.04 seconds.

The optional ComSoft software enables you to carry out online measurements via your PC, save the measurement data so that it is linked to the measuring location and analyze it on the PC. You can use the optional testo fast printer to print measurement data out directly at the measuring location.

You can choose between the following units for pressure measurement: mbar, hPa, bar, Pa, kPa, inH2O, mmH2O, torr and psi. The mean value, the last measured value and the min./max. values can be displayed simply by pressing a key.

Delivery Scope

testo 521-1 differential pressure measuring instrument, including calibration protocol and batteries.

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Technical Data

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 applies only to instrument without probes 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 applies only to instrument without probes connected

Differential pressure (internal sensor) - Piezoresistive
Measuring range	0 to 100 hPa
Accuracy	±0.2 % of fsv
Resolution	0.01 hPa
Static pressure	1000 hPa (abs)
Overload	300 hPa
Zeroing	to 2.5 hPa

Differential pressure (external probe) - Piezoresistive
Measuring range	0 to 2000 hPa
Accuracy	±0.1 % of mv*
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 probe) - Piezoresistive

Measuring range

0 to 2000 hPa

Accuracy

±0.1 % of mv*

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 applies only to instrument without probes connected

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

*Accuracy information applies only to instrument without probes connected

General technical data
Dimensions	219 x 68 x 50 mm
Operating temperature	0 to +50 °C
Product-/housing material	ABS
Channels	2 external; 1 internal
Measuring rate	0.04 s
Connection	Hose: inner Ø 4 mm outer Ø 6 mm
Battery type	9 V (6LR61)
Battery life	Continuous operation w/ internal pressure sensor: 30 h; With rech. battery: 10 h; With carbon battery: 18 h
Display type	LCD (Liquid Crystal Display)
Display function	7 segment display and point matrix
Display update	2x per second, in fast measurement 4x per second
Power supply	Battery/Rechargeable battery,Mains unit 12 V
Interface	RS232
Memory	100 kB; 25,000 measuring values
Storage temperature	-20 to +70 °C
Weight	300 g