ROTRONIC HF4 - Manual (Page 27)

E-M-HF4-V1_22
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF4 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 27 of 29
Document title
© 2009-2011; Rotronic AG E-M-HF4-V1_22
Conformity with standards HF42 HF43 HF45
CE / EMC immunity
EMC Directive 2004/108/EG: EN 61000-6-1: 2001, EN 61000-6-2: 2005
EN 61000-6-3: 2005, EN 61000-6-4: 2001 + A11
Solder type Lead free (RoHS directive)
Fire protection class Corresponds to UL94-HB
FDA / GAMP directives compatible
Environmental limits HF42 HF43 HF45
Storage and transit - 50…+70 °C / -20...+70 °C (models with display), 0…100 %RH, non condensing
Operating limits at electronics - 40 … +60 °C / -10….60 °C (models with display), 0…100 %RH, non condensing
Temperature limits at probe -5 0…+100 °C (valid for type D)
Maximum humidity at sensor
100 %RH up to 80 °C (176 °F)
75 %RH at 100 °C (212 °F)
Maximum air velocity at probe 20 m/s (3,935 ft /min)
Critical environments Humidity sensor: as per DV04-14.0803.02 - Critical chemicals
10.2 Dew point accuracy
The HF4 can be configured to calculate either the dew point or frost point based on the measurement of
relative humidity and temperature. The accuracy of this conversion varies, depending on the humidity and
temperature conditions as shown in the graph below:
Example: at a temperature of 2 0 ˚C, a frost point value of -25 ˚C is measured with an accuracy of
± 0.5 ˚C or better.