TESTO 425 - Technical Data for Testo 425

10 Technical data for testo 425
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10
Technical data for testo 425
• Adjustment conditions for flow probes:
Adjustment in free jet Ø 350 mm, reference pressure 1013 hPa,
based on testo reference Laser Doppler Anemometer (LDA).
• Low flow velocities may result in greater measurem
ent uncertainties
during humidity and temperature measurement! The probe should
be switched on outside a duct under the following conditions:
Ambient temperature: 20°C
Flow: approx. 0 m/s.
Collapse the telescope after use and do not constrict with the cable.
Start with the telescopic links closest to the handle.
Feature Value
Measurement parameters
m/s, fpm
°C, °F
m³/h, cfm, l/s
Accuracy
±(0.03 m/s + 4% of measuring value) (0.01 to
20 m/s)
±(0.5 m/s + 5% of measuring value) (20.01 to
30 m/s)
±0.5 °C
Resolution
0.01 m/s
0.1 °C
Measuring range 0.01 to 30 m/s
-20 to +70 °C
Operating temperature
-20 to +50 °C (instrument)
-20 to +70 °C (probe)
Storage temperature
-20 to +50 °C
Operating humidity
0 to 80 %RH / For indoor use only
IP class
IP20
Level of contamination
PD2
Max. operating altitude
≤ 2000 m above sea level
Nominal output
2 W @ 4,5 V DC
Battery type
3 x 1.5 V AA battery
(included in the scope of delivery)
Battery life
>35 h
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