Technical Data For Testo 425 - TESTO 425 Instruction Manual

sales@GlobalTestSupply.com

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 measurement 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
Measurement parameters
Accuracy
Resolution
Measuring range
Operating temperature
Storage temperature
Operating humidity
IP class
Level of contamination
Max. operating altitude
Nominal output
Battery type
Battery life
www.
10 Technical data for testo 425
Value
m/s, fpm
°C, °F
m³/h, cfm, l/s
±(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
0.01 m/s
0.1 °C
0.01 to 30 m/s
-20 to +70 °C
-20 to +50 °C (instrument)
-20 to +70 °C (probe)
-20 to +50 °C
0 to 80 %RH / For indoor use only
IP20
PD2
≤ 2000 m above sea level
2 W @ 4,5 V DC
3 x 1.5 V AA battery
(included in the scope of delivery)
>35 h
Testo-Direct
33
1.888.610.7664
.com