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testo 521 0...100 hPa / +-0.2 % fsv.
Differential pressure meter 0 to 100 hPa incl. battery and calibration protocol
Highly accurate with internal differential pressure sensor, ideal for inspecting extraction units and ventilators and for monitoring pressure drops in filters. When used with the Pitot tube, the internal pressure sensor measures velocities from 5 - 100 m/s. The 100 Pa probe, which can be connected externally, measures accurately from 1 - 12 m/s.
- Temp. compensated differential pressure sensor built into instrument
- Calculation of velocity and volume flow via Pitot tube measurement
- Multi-point and timed mean calculation
- 2 probe sockets for pressure and temperature
- Save data according to site and analyse on PC/notebook
- Direct calculation of velocity speed and volume flow
- Multi-point and timed mean calculation
- Density compensation
- Up to two 4 to 20 mA interfaces connectable to hand-held instr.
- 1 analog signal can be evaluated per interface
- Scaling of analog signal in hand-held instrument
- Transmitter can be supplied with power from testo 521, for example
- 4 to 20 mA interface can be connected to testo 521, 526, 400, 650 und 950 hand-held instruments
- Two user-defined probe inputs allow the connection of external probes for pressure, temperature, current/voltage
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| Description |
Picture |
Part no. |
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| Absolute pressure probe |
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Pressure probe, 2000 hPa, measures absolute pressure, in robust metal housing with impact protection, incl. quick-closing coupling (M8 x 0.5), magnet for fast attachment
Meas. Range 0 to +2000 hPa
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0638 1847 |
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| Differential pressure probe |
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Pressure probe in robust metal housing with impact protection, incl. magnet for fast attachment, measures differential pressure and flow speeds (in combination with Pitot tube)
Meas. Range 0 to +100 Pa
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0638 1347 |
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Pressure probe, 10 hPa, in robust metal housing with impact protection incl. magnet for fast attachment, to measure differential pressure and flow speeds (in combination with Pitot tube)
Meas. Range 0 to +10 hPa
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0638 1447 |
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Pressure probe, 1000 hPa, measures differential pressure, in robust metal housing with impact protection, incl. quick-closing coupling (M8 x 0.5), magnet for fast attachment
Meas. Range 0 to +1000 hPa
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0638 1647 |
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Pressure probe, 2000 hPa, measures differential pressure, in robust metal housing with impact protection, incl. quick-closing coupling (M8 x 0.5), magnet for fast attachment
Meas. Range 0 to +2000 hPa
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0638 1747 |
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| Pilot tube |
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Pitot tube, 500 mm long, stainless steel, measures flow speed
(Longer versions on request)
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0635 2045 |
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Pitot tube, 350 mm long, stainless steel, measures flow speed
(in combination with pressure probes)
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0635 2145 |
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| Temperature |
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Pipe wrap probe for pipes with diameter of up to 2", for flow/return temp. meas. in hydronic systems
Meas. Range -60 to +130 °C
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0600 4593 |
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Highly accurate air probe for air and gas temperature measurements with bare, mechanically protected sensor
Meas. range -40 to +130 °C
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0610 9714 |
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