TESTO 420 Instruction Manual page 9

Feature
Temperature
coefficient
Response time t90
Operating and
ambient conditions
Values
Please ensure that the volume flow
hood is situated at the minimum
distance from the floor.
Incoming air (air flows from the outlet
into the room): 1 x height of the flow
hood.
Outgoing air (air flows from the room
into the duct): 0.5 x height of the flow
hood.
Humidity: ± 0.03% RH / K (deviating from
22°C, in the range 0 to 60 °C)
Volume flow: ± 0.02% of m.v. / K
(deviating from 22 °C, in the range 0 to 60 °C)
Pressure (absolute pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Pressure (differential pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Temperature: approx. 45 s
Humidity: approx. 15 s
Flow velocity: approx. 1 s
Volume flow: approx. 1 s
Pressure (absolute pressure): approx. 1 s
Pressure (differential pressure): approx. 1 s
Storage temperature: -20 to +60 °C / -4 to
140 °F
Operating temperature: -5 to +50 °C/+23 -
+122°F
Humidity: 0 to 100% RH
Pressure range: 800 to 1100 hPa
4 Technical data
9