TESTO 420 - Accuracy and Resolution Details

4 Technical data
8
Feature Values
Resolution Temperature: 0.1 °C / 0.1°F
Humidity: 0.1% RH
Flow velocity: 0.01 m/s
Volume flow: 1 m³/h / 1 cfm
Pressure (absolute pressure): 0.1 hPa /
0.1 mbar / 0.01 kPa
Pressure (differential pressure): 0.001 Pa /
0.00001 hPa / 0.00001 mbar / 0.0001 mm
H2O / 0.000001 inH2O
Accuracy
(nominal temperatur
e 22°C/71.6°F)
Temperature: ±0.5 °C (0 to +70 °C) / ±0.8 °C
(-20 to 0 °C)
Humidity: ±1.8% RH +3% of m.v. at +22 °C
(5 to 80% RH) (longer high humidity application
can result in a temporary sensor drift)
Flow velocity: no accuracy specification
since calculated variable
Volume flow
1
: ±3% of m.v. +12 m³/h at
+22 °C, 1013 hPa (85 to 3500 m³/h)
±3% of m.v. +7 cfm at +72 °F, 405 inHO (50
to 2,060 cfm)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from
1013 hPa
Pressure (absolute pressure): ± 3 hPa
Pressure (differential pressure): ±2% of m.v.
+ 0.5 Pa (at 22°C, 1013 hPa)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from
1013 hPa
1
All accuracy specifications apply under laboratory conditions or with
necessary compensation (correction factor) with the standard hood
610x610 mm. Minimum outlet size of 360x360 mm