ROTRONIC HM4 - Manual (Page 34)

E-M-HM4-V0_08
ROTRONIC AG
Bassersdorf, Switzerland
Document Code Unit
HM4 Humidity and Temperature Probe with
Heated Sensor
Instruction Manual
Document Type
Page 34 of 41
Document Title
© 2014; ROTRONIC AG E-M-HM4-V0_08
Temperature Measurement
Sensor Pt100 RTD, Class B 1/3 DIN
Measurement range - 40…85 °C, standard scale: -40…60 °C
Measuring accuracy @ 23 °C ±0.1 °C
Extended measuring accuracy
±0.1 °C @ - 40…60 °C (sensor heating switched on)
±0.15 °C @ 60…85 °C (sensor heating switched on)
Long-term stability <0.1 °C/year
Response time Typically: 30 s, (wind velocity at sensor 1 m/s)
Calculated Parameters
Psychrometric calculations
Dew point (Dp) above and below freezing
Frost point (Fp) below freezing point and dew point above freezing point
Wet bulb temperature (Tw)
Enthalpy (H)
Vapour concentration (Dv)
Specific humidity (Q)
Mixing ratio by weight (R)
Vapour concentration at saturation (Dvs)
Vapour partial pressure (E)
Vapour saturation pressure (Ew)
Startup Time and Measurement Interval
Startup time <9 s (typical)
Measurement interval 20 s (typical)
DRAFT