Testo 521 - Differential Pressure Measuring Instrument

Brand: Testo

The high precision testo 521-1 and 521-2 differential pressure measuring instrument is ideal for accurate differential pressure measurements in air conditioning and ventilation technology, for pressure drop on filters, for instance, for checking fans and extractors, or for pitot tube measurements.

The highly accurate differential pressure meter, testo 521, with an internal pressure sensor from 0 to 100 hPa, is ideal for pitot tube measurements in the range of 5 to 100 m/s.

The testo 521 is available in 2 accuracy classes, the testo 521-1 with an internal pressure sensor with Class 0.2, and the testo 521-2 with an internal pressure sensor with Class 0.1.

In the case of velocity speeds in the range of 1 to 12 m/s, you can carry out accurate measurements using the 100 Pa probe, which can be attached externally.

The measurement data can be saved according to location, and analyzed on your PC, or printed on site on your testo printer.

The testo 521-3 high precision differential pressure measuring instrument easily determines even the smallest differential pressures (up to +2.5 hPa).

Its high accuracy and a resolution of 0.1 Pa make the instrument ideal for differential pressure measurements, in clean rooms, or for flue inspections.

Using the testo 521-3, even the smallest differential pressures, up to 250 Pa, are measured.

High accuracy and a resolution of 0.1 Pa mean the instrument is ideal for differential pressure measurements in clean rooms.

When used with a pitot tube, the internal pressure sensor measures flow speeds in the range of 0.01 to 3937 fpm.
Features
  • Testo 521-1
    • 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
  • Testo 521-2
    • Integrated differential pressure sensor with an accuracy of 0.1% of f.v.
    • Calculation of flow velocity and volume flow via pitot tube (optional)
    • Multi-point and timed mean calculation
    • 2 probe inputs for additional pressure and temperature probes
  • Testo 521-3
    • Integrated temperature-compensated differential pressure sensor with accuracy of up to ± 0.5 Pa
    • Calculation of the flow velocity and the volume flow via Pitot tube (optional)
    • Direct zeroing of the display values of pressure probes
    • 2 probe inputs for additional pressure and temperature probes

Specifications

Brand

Delivery Scope

  • Testo 521 Differential Pressure Measuring Instrument, including Calibration Protocol and Batteries

Dimensions

  • 9 x 3 x 2 in. / 219 x 68 x 50 mm

Operating Temperature

  • 32° F to 122° F / 0° C to +50° C

Housing

  • ABS

Channels

  • 2 External, 1 Internal

Measuring Rate

  • 0.04 sec

Connection

  • Hose: Inner Ø 4 mm, Outer Ø 6 mm

Battery Type

  • 9 V (6LR61)

Battery Life

  • Continuous Operation with Internal Pressure Sensor: 30 h, With Rechargeable Battery: 10 h, With Carbon Battery: 18 h

Display Type

  • LCD

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

  • RS-232

Memory

  • 100 kB, 25,000 Measuring Values

Storage Temperature

  • -4° F to 158° F / -20° C to +70° C

Weight

  • 11 oz. / 300 g

Temperature - NTC

  • Measuring Range: -40° F to 302° F / -40° C to +150° C
  • Accuracy: ± 0.4° F (14° F to 122° F)¹ / ± 0.2° C (-10° C to +50° C)¹ | ± 0.7° F (Remaining Range)¹ / ± 0.4° C (Remaining Range)¹
  • ¹Accuracy information applies only to instrument without probes connected
  • Resolution, 0.1° F / 0.1° C

Temperature - Type K TC

  • Measuring Range: -328° F to 2498° F / -200° C to +1370° C
  • Accuracy: ± 0.7° F (-148° F to 392° F)² / ± 0.4° C (-100° C to +200° C)² | ± 2° F Remaining Range² / ± 1° C Remaining Range²
  • ²Accuracy information applies only to instrument without probes connected
  • Resolution: 0.1° F / 0.1° C

Differential Pressure (Internal Sensor) - Piezoresistive

  • Measuring Range: 0 to 40 inH₂O / 0 to 100 hPa
  • Accuracy: ± 0.2 % of Full Scale Value
  • Resolution: 0.01 inH₂O / 0.01 hPa
  • Static Pressure: 400 inH₂O (abs) / 1000 hPa (abs)
  • Overload: 120 inH₂O / 300 hPa
  • Zeroing: to 1.0 inH₂O / to 2.5 hPa

Differential Pressure (External Probe) - Piezoresistive

  • Measuring Range: 0 to 800 inH₂O
  • Accuracy: ± 0.1 % of mv³
  • ³Accuracy information applies only to instrument without probes connected
  • Resolution: 0.1 inH₂O (0638 1347) / 0.1 Pa (0638 1347) | 0.01 inH₂O (0638 1547) / 0.01 hPa (0638 1547) | 0.001 inH₂O (0638 1447) / 0.001 hPa (0638 1447) | 0.1 inH₂O (0638 1847 / 0638 1647) / 0.1 hPa (0638 1847 / 0638 1647)

Differential Pressure (External Probe) - Ceramic

  • Measuring Range: -15 to 5802 psi / -1 to 400 bar
  • Accuracy: ± 0.2 % of full-scale value**
  • **Accuracy information applies only to instrument without probes connected
  • Resolution: 0.14 psi / 0.01 bar
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