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)

±0.5 %RH (0 … 40 %RH)

±0.8 %RH (40 … 95 %RH)

T63 response time

15 s

Sensor options

HUMICAPâ R2

HUMICAPâ R2C 3)

Temperature

Measurement range

−70 … +180 °C (−94 … +356 °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)

Sensor

Pt100 RTD Class F0.1 IEC 60751

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) Sensor purge feature available with this sensor.

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

HMP8 humidity measurement accuracy as a function of

temperature

0

0.1

0.2

0.3

0.4

Temperature [°C]

0.5

HMP8 temperature measurement accuracy over full

range

Operating environment

Operating temperature of probe body

−40 … +80 °C (−40 … +176 °F)

Operating temperature of probe head

−70 … +180 °C (−94 … +356 °F)

Operational pressure

< 40 bar

Operating environment

Suitable for outdoor use

Measurement environment

For air, nitrogen, hydrogen, argon,

helium, oxygen, and vacuum 1)

IP rating of probe body

IP66

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

10 mA typical, 500 mA max.

Digital output

RS-485, non-isolated

Protocols

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

Type approvals

DNV GL certificate no. TAA00002YT

Compliance marks

CE, China RoHS, RCM

Mechanical specifications

Connector

M12 5-pin A-coded male

Probe fitting

ISO1/2” and NPT1/2” fittings included

Weight

512 g (18.1 oz)

Probe cable length

2 m (6.56 ft)

Materials

Probe

AISI 316L

Probe body

AISI 316L

Cable jacket

FEP

Accessories

Ball valve kit ISO 1/2" with welding joint BALLVALVE-1

Indigo USB adapter 1)

USB2

1)

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