Overview of a Primary Product

Technical data
testo 420 Flow Hood
Kit
Includes: testo 420 flow hood base, t420
Multi-function Flow Instrument, installed
Pitot Flow Matrix, 24" x 24" flow hood with
supporting rods, USB cable, batteries, soft
case w/handle and wheels and
Optional NIST Certification
Part no. 400563 4200
General technical data
Operating temperature 20 to 140 °F (-5 to +60 °C)
Storage temperature -5 to 140 °F (-20 to +60 °C)
Weight
Standard hood
6.4 lbs. (2.9 kg)
24" x 24" (610 x 610 mm)
Battery type Type AA
Battery life 30 hrs
Display Dot matrix LCD with back-light
Memory 2 GB internal
Interface Micro USB & Bluetooth
NIST Certification Optional
Measurement Specifications:
Measuring range
25 to 2,300 CFM
(40 to 4000 m³/h)
0 to 2,750 ft/min
(0 to 14 m/s)
Flow Volume Flow Velocity
Accuracy
±3 % of m.v.
(+7 CFM)
±2.0 ft/m
(0.01 m/s)
Resolution 1.0 CFM
0.01 ft/min
(0.0001 m/s)
-5 to 140°F
(-20 to +60 °C)
Air Flow
Temperature
±0.9 °F (20 to 140 °F)
±0.5 °C (-5 to 60 °C)
0.1 °F
20 to 140°F /
(-104 to 140 °F)
Dew Point /
Wet Bulb
Not Specified
0.1 °F
Patented flow straighteners are
standard in all 420 flow hood
sizes and configurations.
Testo 420 Bluetooth App allows
for Smart, hands-free operation.
Display and create custom reports
on mobile devices. Send reports
via email from the job site.
Sturdy, wheeled tripod (optional)
for large jobs or sites with high
installed outlets. Convenient
hands free 420 hood operation
with Bluetooth connectivity.
Patented flow straighteners
tame turbulence to allow
more accurate and stable flow
readings.
testo 420 Flow Hood System
Key Features:
-0.5 to 0.5 inWC
(-120 to 120 Pa)
Dierential
Pressure
±2 % of m.v.
+0.02
0.000001 inWC
700 to 1,100
mbar
Absolute
Pressure
±1.2 inWC
±3 mbar
0.1 mbar
0 to 100 %RH
Relative
Humidity
±1.8 %RH
+3% m.v.
0.1%RH
• Data logging directly to on-board 2 GB memory
• Convenient joystick navigation within menu for setting up individual folders
• Total volume flow in CFM (cubic feet per minute) is displayed
• Individual measurement data saved in folders can be recalled and displayed as total volume flow of all measurements
• Logged data can be transferred to PC using micro-USB cable
Warranty 2 years