Testo 521 Differential Pressure Manometer
The Testo 521 is a series of high-precision differential pressure manometers designed for accurate measurements in various applications. These instruments are ideal for HVAC system checks, cleanroom monitoring, and ventilation system analysis.
Key Features and Benefits
- Integrated differential pressure sensor with temperature compensation.
- Two inputs for connecting additional temperature and pressure probes.
- Direct calculation of velocity and flow rate.
- Direct zeroing of the displayed value from the pressure probes.
- Display of minimum, maximum, and hold values.
- Easy on-site data logging for analysis, management, and documentation via PC software (optional).
- Calculation of average values over time and multi-point averaging.
Testo 521 Models
The Testo 521 series includes three models, each offering different accuracy levels and measurement ranges:
Testo 521-1
Measurement Range: 0 to 100 hPa
Accuracy: 0.2% of full scale
Model Number: 0560 5210
Testo 521-2
Measurement Range: 0 to 100 hPa
Accuracy: 0.1% of full scale
Model Number: 0560 5211
The Testo 521-1 and 521-2 are particularly suitable for checks on extractors and fans, and for monitoring pressure drops in filters. When used with a Pitot tube, they can also measure flow velocities from 5 to 100 m/s.
Testo 521-3
Measurement Range: 0 to 2.5 hPa
Accuracy: High precision with a resolution of 0.1 Pa
Model Number: 0560 5213
The Testo 521-3 is ideal for measuring very small differential pressures, making it suitable for cleanroom measurements. With a Pitot tube, it measures velocities from 1 to 20 m/s.
Technical Specifications
General Technical Data (Testo 521-1/-2/-3):
| Storage Temperature: | -20 to +70 °C |
| Operating Temperature: | 0 to +50 °C |
| Power Supply: | Battery/Rechargeable battery, 12 V power adapter |
| Battery Type: | 9 V (6LR61) |
| Battery Life: | 30 h (internal sensor), 10 h (rechargeable battery), 18 h (zinc-carbon battery) |
| Weight: | 300 g |
| Dimensions: | 219 x 68 x 50 mm |
| Casing Material: | ABS |
| Memory: | 100 kB (approx. 25,000 readings) |
| Connection: | Tubing: internal Ø 4 mm, external Ø 6 mm |
| Display: | LCD with icons, 7-segment and dot matrix |
| Display Update Rate: | 2x per second (4x per second in fast measurement mode) |
| Measurement Cycle: | From 0.04 seconds |
| PC Interface: | RS232 |
| Other Features: | Network connection and battery recharging, automatic probe identification, 9 selectable units (mbar, hPa, bar, Pa, kPa, inH₂O, mmH₂O, torr, psi) |
| Warranty: | 2 years |
Sensor Types:
| Type of Sensor | Range | Accuracy ±1 digit* | Overpressure | Static Pressure | Zero | Model |
|---|---|---|---|---|---|---|
| Piezoresistive Pressure Sensor | 0...100 hPa (521-1/-2) 0...2.5 hPa (521-3**) |
±0.2% f.s. (521-1) ±0.1% f.s. (521-2) ±0.5 Pa (0...20 Pa) ±(0.5 Pa ±0.5% mv) (20.1...250 Pa) (521-3**) |
300 hPa (521-1/-2) 50 hPa (521-3**) |
2000 hPa (521-1/-2) 100 hPa (521-3**) |
Up to 2.5 hPa (521-1/-2) Up to 0.5 hPa (521-3**) |
0638 1347 |
| Piezoresistive Pressure Sensor for External Probes | 0...2000 hPa | ±0.1% mv | -1...400 bar | - | - | 0638 1847 |
| Ceramic Pressure Sensor for External Probes | -40...+150 °C | ±0.2% f.s. | - | - | - | NTC |
| Type K (NiCr-Ni) | -200...+1370 °C | ±0.4 °C (-100...+200 °C) ±1 °C (remaining range) |
- | - | - |
*Accuracy data is only valid for the instrument without connected probes.
**Sensor unsuitable for long-term measurements.
Accessories
A range of accessories is available to enhance the functionality of the Testo 521:
- Other Accessories and Spares: Rechargeable 9 V battery, charger for 9 V rechargeable battery.
- Transport and Protection: TopSafe protective case, transport case.
- Printer and Accessories: Portable printer, fast charger for AA batteries, thermal paper rolls.
- Software and Accessories: ComSoft Professional software, RS232 connection cable.
- Probe Accessories: Connection cables (1.5 m, 5 m, 2.5 m), connection hoses, hose connection sets, adapter for NiCr-Ni thermocouples.
- Calibration Certificates: DAkkS and ISO calibration certificates for pressure and temperature measurements.
Probes
The Testo 521 is compatible with a variety of probes:
Differential Pressure Probes
| Type of Probe | Image | Range | Accuracy | Overpressure | Static Pressure | Zero | Model |
|---|---|---|---|---|---|---|---|
| High-precision pressure probe, 100 Pa, with Pitot tube | [Image of probe] | 0...+100 Pa | ±(0.3 Pa ±0.5% mv) | 50 hPa | 100 hPa | Up to 20 Pa | 0638 1347 |
| Pressure probe, 10 hPa, with Pitot tube | [Image of probe] | 0...+10 hPa | ±0.03 hPa | 50 hPa | 1000 hPa | Up to 0.4 hPa | 0638 1447 |
| Pressure probe, 100 hPa, with Pitot tube | [Image of probe] | 0...+100 hPa | ±0.5% mv (+20 to +100 hPa) ±0.1 hPa (0 to +20 hPa) |
300 hPa | 1000 hPa | Up to 4 hPa | 0638 1547 |
| Pressure probe, 1000 hPa, with quick-release coupling | [Image of probe] | 0...+1000 hPa | ±1 hPa (0 to 200 hPa) ±0.5% mv (200 to 1000 hPa) |
2000 hPa | 1000 hPa | Up to 20 hPa | 0638 1647 |
Absolute Pressure Probes
| Type of Probe | Image | Range | Accuracy | Overpressure | Model |
|---|---|---|---|---|---|
| Absolute pressure probe, 2000 hPa, with quick-release coupling | [Image of probe] | 0...+2000 hPa | ±5 hPa (0 to 2000 hPa) | 4000 hPa | 0638 1847 |
Relative Pressure Probes (Audiovisual Compatible)
| Type of Probe | Image | Range | Accuracy | Overpressure | Zero | Model |
|---|---|---|---|---|---|---|
| Low-pressure probe, stainless steel, refrigerant-proof, up to 10 bar | [Image of probe] | -1...+10 bar | ±1% f.s. | 25 bar | Up to 0.1 bar | 0638 1741 |
| High-pressure probe, stainless steel, refrigerant-proof, up to 30 bar | [Image of probe] | -1...+30 bar | ±1% f.s. | 120 bar | Up to 0.3 bar | 0638 1841 |
| High-pressure probe, stainless steel, refrigerant-proof, up to 40 bar | [Image of probe] | -1...+40 bar | ±1% f.s. | 120 bar | Up to 0.4 bar | 0638 1941 |
Temperature Probes
| Type of Probe | Image | Dimensions (Shaft/Tip) | Range | Accuracy | t99 | Model |
|---|---|---|---|---|---|---|
| Fast-response surface probe** | [Image of probe] | 150 mm / Ø 10 mm | -200...+300 °C | Class 2* | 3 s | 0604 0194 |
| Fast-response immersion/penetration probe for liquids** | [Image of probe] | 150 mm / Ø 1.5 mm | -200...+600 °C | Class 1* | 1 s | 0604 0493 |
| Fast-response immersion/penetration probe for gases and liquids with a thin tip** | [Image of probe] | 150 mm / Ø 1.4 mm | -200...+600 °C | Class 1* | 1 s | 0604 9794 |
| Fast-response immersion/penetration probe for high temperatures** | [Image of probe] | 470 mm / Ø 1.5 mm | -200...+1100 °C | Class 1* | 1 s | 0604 0593 |
*According to EN 60584-2, Class 1/2 accuracy refers to -40 to +1000/+1200 °C.
**Connection: Requires connection cable 0430 0143 or 0430 0145.
Pitot Tubes
| Type of Probe | Image | Length | Temperature Range | Model |
|---|---|---|---|---|
| Pitot tube, 300 mm, Ø 4 mm, stainless steel, measures velocity | [Image of probe] | 300 mm / Ø 4 mm | 0...+600 °C | 0635 2245 |
| Pitot tube, 500 mm, stainless steel, Ø 7 mm, measures velocity with pressure probes 0638 1347 / 0638 1447 / 0638 1547 or Testo 521 with internal sensor | [Image of probe] | 500 mm / Ø 7 mm | 0...+600 °C | 0635 2045 |
| Pitot tube, 350 mm, stainless steel, Ø 7 mm, measures velocity with pressure probes 0638 1347 / 0638 1447 / 0638 1547 or Testo 521 with internal sensor | [Image of probe] | 350 mm / Ø 7 mm | 0...+600 °C | 0635 2145 |
| Pitot tube, 1000 mm, stainless steel, measures velocity | [Image of probe] | 1000 mm / Ø 7 mm | 0...+600 °C | 0635 2345 |
Straight Pitot Tubes
| Type of Probe | Image | Length | Temperature Range | Probe Type | Model |
|---|---|---|---|---|---|
| Pitot tube, stainless steel, 500 mm length, for measuring velocity, incl. temperature recording, for pressure probes 0638 1345/..1445/..1545 | [Image of probe] | 500 mm / Ø 8 mm | -40...+600 °C | Type K (NiCr-Ni) | 0635 2140 |
| Pitot tube, stainless steel, 1,000 mm length, for measuring velocity, incl. temperature recording, for pressure probes 0638 1345/..1445/..1545 | [Image of probe] | 1000 mm / Ø 8 mm | -40...+600 °C | Type K (NiCr-Ni) | 0635 2240 |
