Vaisala HMP155 Technical data

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HMP155 Humidity and Temperature Probe

Features/Beneﬁts

Vaisala HUMICAP®180R sensor

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- superior long-term stability

Optional warmed humidity

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probe

Plug-and-play

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Chemical purge

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USB connection for service use

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Installation kits for DTR13 and

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DTR502 radiation shields and also for a Stevenson screen

Weather-proof housing IP66

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New, fast temperature probe

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Dierent output possibilities:

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voltage, RS-485, resistive Pt100

HMP155 with a new, stable HUMICAP®180R sensor and an additional temperature probe.

New probe for reliability

The new Vaisala HUMICAP® Humidity and Temperature Probe HMP155 provides reliable humidity and temperature measurement.

Long-term stability

The HMP155 has a new generation Vaisala HUMICAP has excellent stability and withstands well harsh environments. The probe structure is solid and the sensor is protected with a sintered teon lter, which gives maximum protection against liquid water, dust, and dirt.

180R sensor that

Warmed probe and high

This is an environment to which Vaisala has designed a patented, warmed probe for reliable measuring. As the sensor head is warmed continuously, the humidity level inside it stays below the ambient level. Thus, it also reduces the risk of condensation forming on the probe.

Fast temperature measurement

What’s more, with its fast response time, the additional temperature probe for the HMP155 is ideal for measurement in environments with changing temperatures.

humidity environment

Measuring humidity reliably is challenging in environments where humidity is near saturation. Measurements may be corrupted by fog, mist, rain, and heavy dew. A wet probe may not give an accurate measurement in the ambient air.

Applications: meteorological

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applications, aviation and road weather, instrumentation

Long lifetime

Protecting the sensor from scattered and direct solar radiation, and precipitation will increase its lifetime. Thus, Vaisala recommends installing the HMP155 in one of the following radiation shields: DTR503, DTR13, or a Stevenson screen.

Easy maintenance

The probe can be calibrated using a pc with a USB cable, with the push buttons, or with the MI70 indicator.

Technical data

RS485 output voltage output

-80 0.4 -0.4 0.45 -0.45 20 0.12 -0.12 0.17 -0.17 60 0.22 -0.22 0.4 -0.4

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-80 -60 -40 -20 0 20 40 60

RS485 output voltage output

ºC

Δ ºC

Performance

RELATIVE HUMIDITY

Measurement range 0 ... 100 %RH Accuracy (incl. non-linearity, hysteresis and repeatability) at

+15 ... +25 °C (+59 ... +77 °F) ±1 %RH (0 ... 90 %RH)

±1.7 %RH (90 ... 100 %RH)

-20 ... +40 °C (-4 ... 104 °F) ±(1.0 + 0.008 x reading) %RH

-40 ... -20 °C (-40 ... -4 °F) ±(1.2 + 0.012 x reading) %RH +40 ... +60 °C (+104 ... +140 °F) ±(1.2 + 0.012 x reading) %RH

-60 ... -40 °C (-76 ... -40 °F) ±(1.4 + 0.032 x reading) %RH Factory calibration uncertainty (+20 °C /+68 °F) * Deﬁned as ±2 standard deviation limits. Small variations possible, see also calibration certiﬁcate. Recommended humidity sensor HUMICAP Response time at +20 °C in still air with a sintered PTFE ﬁlter

63 % 20 s 90 % 60 s

TEMPERATURE

Measurement range -80 ... +60 °C (-112 ... +140 °F) Accuracy with voltage output at

-80 ... +20 °C ±(0.226 - 0.0028 x temperature) °C

+20 ... +60 °C ±(0.055 + 0.0057 x temperature) °C passive (resistive) output

according to IEC 751

±(0.1 + 0.00167 x |temperature|)°C

1/3 Class B

RS485 output

-80 ... +20 °C ±(0.176 - 0.0028 x temperature) °C

+20 ... +60 °C ±(0.07 + 0.0025 x temperature) °C Accuracy over temperature range (opposite) Temperature sensor Pt100 RTD 1/3 Class B IEC 751 Response time with additional temperature probe in 3 m/s air ﬂow

63 % <20 s 90 % <35 s

OTHER VARIABLES

dewpoint/frost point temperature, wet bulb temperature, mixing ratio

±0.6 %RH (0 ... 40 %RH)*

±1.0 %RH (40 ... 97 %RH)*

180R(C)

General

Operating temperature range -80 ... +60 °C (-112 ... +140 °F) Storage temperature range -80 ... +60 °C (-112 ... +140 °F) Connection 8-pin male M12 connector Connection cables 3.5, 10, and 30 m Cable material PUR Wire size AWG26 Service cables USB connection cable

MI70 connection cable Additional T probe cable length 2 m Housing material PC Housing classiﬁcation IP66 Sensor protection sintered PTFE Weigth (probe) 86 g Electromagnetic compatibility: Complies with the EMC standard EN61326-1, Electrical equipment for measurement control and laboratory use - EMC requirement for use in industrial locations

Inputs and outputs

Operating voltage 7 ... 28 VDC*

*Note: minimum operating voltage 12 V with 0 ... 5 V output and 16 V with 0 ... 10 V output, probe heating, chemical purge or XHEAT.

Outputs

voltage output 0 ... 1 V, 0 ... 5 V, 0 ... 10 V resistive Pt100 (4-wire connection)

RS485 Average current consumption (+15 VDC, load 100 kOhm)

0 ... 1 V output <3 mA

0 ... 10 V output +0.5 mA

RS485 <4 mA

during chemical purge max. 110 mA

with warmed probe max. 150 mA Settling time at power-up

voltage output 2 s

RS485 3 s

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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