Differential pressure measuring instrument

The testo 521-3 differential pressure measuring instrument is designed for high-precision differential pressure measurements in air conditioning and ventilation technology. It can be used, for example, for measurements in clean rooms and for flue inspections – thanks to a high level of accuracy and outstanding resolution. In conjunction with a Pitot tube (optional), the integrated pressure sensor measures flow velocities of +1 to +20 m/s. The integrated temperature-compensated differential pressure sensor performs measurements to an accuracy of up to ± 0.5 Pa. 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 521-3 differential pressure measuring instrument The integrated differential pressure sensor enables the testo 521-3 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. The optional ComSoft software enables you to 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 out measurement data 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 at the press of a button.

testo 521-3 differential pressure measuring instrument, including calibration protocol and batteries.

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
*Accuracy information applies only to instrument without probes connected
Differential pressure (internal sensor) – Piezoresistive Measuring range
0 to 2.5 hPa**
Accuracy
±0.5 Pa (0 to 20 Pa)
±(0.5 Pa ±0.5 % of mv) (20.1 to 250 Pa)
Resolution
0.1 Pa
Static pressure
1000 hPa
Overload
50 hPa
Zeroing
to 0.5 hPa
**Sensor is not suitable for long-term measurements
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
Housing
ABS
Channels
2; 1
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
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