Technical data

Measurement performance

Relative humidity

Measurement range

0 … 100 %RH

Accuracy at +23 °C (+73.4 °F) 1)

±0.8 %RH (0 … 90 %RH)

Factory calibration uncertainty 2)

±0.7 %RH (0 … 40 %RH)

±1 %RH (40 … 95 %RH)

T63 response time 3)

15 s

Sensor

HUMICAPâ I

Temperature

Measurement range

−40 … +120 °C (−40 … +248 °F)

Accuracy at +23 °C (+73.4 °F) 1)

±0.1 °C (±0.18 °F)

Factory calibration uncertainty 2)

±0.1 °C (±0.18 °F) at +23 °C (+73.4 °F)

T63 response time 3)

70 s

1)

Defined against calibration reference. Including non-linearity, hysteresis, and repeatability.

2) Defined as ±2 standard deviation limits. Small variations possible; see calibration certificate.

3) In still air.

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Temperature [°C]

3.5

4.0

90

...

100

%RH

0 ... 90 %RH

HMP9 humidity measurement accuracy as a function of

temperature

0

0.1

0.2

0.3

0.4

Temperature [°C]

0.5

HMP9 temperature measurement accuracy over full

range

Operating environment

Operating temperature of probe body

−40 … +60 °C (−40 … +140 °F)

Operating temperature of probe head

−40 … +120 °C (−40 … +248 °F)

Storage temperature

−40 … +60 °C (−40 … +140 °F)

Operating environment

Suitable for outdoor use when

protected from rain

Measurement environment

For air, nitrogen, hydrogen, argon,

helium, and oxygen 1)

IP rating of probe body

IP65

1)

Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases.

Inputs and outputs

Operating voltage

15 … 30 V DC

Current consumption

5 mA typical, 400 mA max.

Digital output

RS-485, non-isolated

Default serial settings

19200 bps N 8 2

Protocol

Modbus RTU

Output parameters

Absolute humidity (g/m3)

Relative humidity (%RH)

Absolute humidity at NTP (g/m3)

Relative humidity (dew/frost) (%RH)

Dew point temperature (°C)

Temperature (°C)

Dew/frost point temperature (°C)

Water concentration (ppmv)

Dew/frost point temperature at 1 atm

(°C)

Water concentration (wet basis)

(vol‑%)

Dew point temperature at 1 atm (°C)

Water mass fraction (ppmw)

Dew point temperature difference (°C) Water vapor pressure (hPa)

Enthalpy (kJ/kg)

Water vapor saturation pressure

(hPa)

Mixing ratio (g/kg)

Wet-bulb temperature (°C)

Compliance

EU directives and regulations

EMC Directive (2014/30/EU)

RoHS Directive (2011/65/EU)

amended by 2015/863

EMC compatibility

EN 61326‑1, industrial environment

Compliance marks

CE, China RoHS, RCM

Mechanical specifications

Connector

M12 5-pin A-coded male

Weight

68 g (2.40 oz)

Probe cable length

2 m (6.56 ft)

Materials

Probe

AISI 316L

Probe body

PBT

Cable overmolds

FEP

Accessories

HMP9 calibration adapter for HMK15

ASM213801

HMP9 duct installation kit

ASM214055

Solar radiation shield DTR502B with

sensor head support 215130

DTR502B and 215130

Indigo USB adapter 1)

USB2

1)

Vaisala Insight software for Windows available at www.vaisala.com/insight.