MANUFACTURER
The highly accurate testo 521-1 differential pressure gauge is ideal for precise differential pressure measurements in ventilation and air conditioning systems. Such as reducing pressure on filters, checking fans and extractors or measuring with a Pitot tube.
The testo 521-1 differential pressure gauge is used for accurate differential pressure measurements on air conditioning and ventilation systems. This device is ideal for measuring pressure drop on filters and testing fans and extractors. The testo 521-1 can also perform measurements in ventilation ducts or process air using a Pitot tube (measuring range 5 to 100 m/s).
testo 521-1 also integrates a temperature compensated differential pressure sensor with an accuracy of 0.2 %fv. Additionally, you can add up to 2 compatible probes (optional to order) to the testo 521-1. The measuring heads you can choose from include:
Provide cover: Testo 521-1 differential pressure gauge, battery and factory test paper.
| 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 |
*Accuracy information only applies when the probe is not 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 (pressure) |
| 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) |
*Accuracy information only applies when the probe is not connected
| Differential pressure (external measuring head) – 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 | 0 to +50 °C |
| Structural materials | ABS |
| Number of connection channels | 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, for 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 |
