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:
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.
| 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 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)
|
*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
|
Connection cable, 2.5 m long, for pressure probes 0638 1741/1841/1941/2041/2141
Order Number: 0409 0202
Connection cable
Order Number: 0430 0143
Cable, 5 m long, connects probe with plug-in head to measuring instrument
Order Number: 0430 0145
Connection hose, silicone - max. load capacity up to 700 hPa (mbar)
Order Number: 0554 0440
Desktop mains unit with international connection option
Order Number: 0554 1143
ISO temperature calibration certificate for air/immersion probes; with 3 measuring points: -18 / 0 / +60 °C
Order Number: 0520 0001
ISO pressure calibration certificate; with 5 measuring points distributed over the measuring range; accuracy > 0.6 % of f.v.
Order Number: 0520 0005
ISO temperature calibration certificate for air/immersion probes; with 3 measuring points: 0 / +150 / +300 °C
Order Number: 0520 0021
ISO pressure calibration certificate; with 5 measuring points distributed over the measuring range, accuracy 0.1 to 0.6 % of f.v.
Order Number: 0520 0025
ISO calibration certificate/Pressure
Order Number: 0520 0035
DAkkS calibration certificate/Pressure
Order Number: 0520 0205
DAkkS temperature calibration certificate for air/immersion probes; with 3 measuring points: -20 / 0 / +60 °C
Order Number: 0520 0211
DAkkS pressure calibration certificate; with 9 measuring points distributed over the measuring range, accuracy 0.1 to 0.6 % of f.v.
Order Number: 0520 0215
DAkkS pressure calibration certificate; with 5 measuring points distributed over the measuring range, accuracy > 0.6 % of f.v.
Order Number: 0520 0225
DAkkS temperature calibration certificate for surface probes; with 3 measuring points: +100 / +200 / +300 °C
Order Number: 0520 0271
ISO calibration certificate/Pressure
Order Number: 0520 0405
ISO calibration certificate/electrical
Order Number: 0520 1000
ISO temperature calibration certificate for surface probes; with 3 measuring points: +60 / +120 / +180 °C
Order Number: 0520 0071
testo fast printer IRDA
Order Number: 0554 0549
Spare thermal paper for printer, permanent
Order Number: 0554 0568
RS232 cable
Order Number: 0409 0178
TopSafe (protection case)
Order Number: 0516 0446
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