Vaisala HUMICAP, HMP155 User Manual

HUMICAPâ Humidity and Temperature Probe HMP155

Vaisala HUMICAP HMP155 provides reliable humidity and temperature measurement. It is designed especially for demanding outdoor applications.

Humidity and Temperature Probe

HMP155 with an additional temperature probe and optional Stevenson screen installation kit.

Features

• Vaisala HUMICAPâ180R sensor: superior long-term stability

• Optional warmed humidity probe and chemical purge

• Plug-and-play

• USB connection for service use

• Use with DTR13 and DTR503 radiation shields and a Stevenson screen

• Weather-proof housing IP66

• Optional, fast temperature probe

• Dierent output possibilities: voltage, RS-485, resistive Pt100

• Applications: meteorology, aviation and road weather, instrumentation

Long-term stability

HMP155 uses the proven Vaisala HUMICAPâ180R sensor that has excellent stability and withstands well harsh environments. The probe structure is solid and the sensor is protected by default with a sintered teﬂon ﬁlter, which gives maximum protection against water, dust, and dirt.

Warmed probe and highhumidity 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.

This is an environment to which Vaisala has designed this patented, warmed probe for reliable measurements. 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 measurements

With its fast response time, the additional temperature probe for HMP155 is ideal for measuring in environments with changing temperatures. The membrane ﬁlter speeds up the relative humidity measurement.

Long lifetime

Protecting the sensor from precipitation, and scattered and direct solar radiation increases its lifetime. Thus, Vaisala recommends installing HMP155 in one of the following radiation shields: DTR503, DTR13, or Stevenson screen. For the additional temperature probe, an installation kit is available for Vaisala DTR502 Radiation Shield.

Calibration

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

Technical Data

40 [1.57]

86 [3.39]

279 [10.98]

266 [10.47]

[0.94]

HMP155 humidity measurement performance

Sensor HUMICAPâ180R and 180R2 f

Observation range 0 … 100 %RH

Response time at +20 °C (+68 °F) in still air with sintered Teﬂon ﬁlter

Factory calibration uncertainty at +20 °C (+68 °F)

Accuracy (including non-linearity, hysteresis, and repeatability)

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

At −20 … +40 °C (−4 … +104 °F) ±(1.0 + 0.008 × reading) %RH

At −40 … −20 °C (−40 … −4 °F) ±(1.2 + 0.012 × reading) %RH

At +40 … +60 °C (+104 … +140 °F) ±(1.2 + 0.012 × reading) %RH

At −60 … −40 °C (−76 … −40 °F) ±(1.4 + 0.032 × reading) %RH

1) Deﬁned as ±2 s

tandard deviation limits. Small variations possible (see also the calibration certiﬁcate).

applications HUMICAPâ180C and 180R2C for applications with chemical purge and/or warmed probe

63 %: 20 s 90 %: 60 s

±0.6 %RH (0 … 40 %RH) ±1.0 %RH (40 … 95 %RH)

±1.

7 %RH (90 … 100 %RH)

or typical

HMP155 temperature measurement performance

Sensor Pt100 RTD element, Class F 0.1

Observation range −80 … +60 °C (−112 … +140 °F)

Response time for additional temperature probe in 3 m/s (7 mph) air

ﬂow

Other measured variables Dew point / frost point temperature,

Accuracy with voltage output

At −80 … +20 °C (−112 … +68 °F) ±(0.226 - 0.0028 × temperature) °C

At +20 … +60 °C (+68 … +140 °F) ±(0.055 + 0.0057 × temperature) °C

Accuracy with passive (resistive) output

According to Tolerance Class AA

IEC 60751

Accuracy with RS‑485 output

At −80 … +20 °C (−112 … +68 °F) ±(0.176 - 0.0028 × temperature) °C

At +20 … +60 °C (+68 … +140 °F) ±(0.07 + 0.0025 × temperature) °C

1) Tolerance Class AA IEC 60751 corresponds to IEC 751 1/3 Class B

C 60751

63 %: < 20 s 90 %: < 35 s

wet bulb temperature, mixing ratio

±(0.1 + 0.0017 × |temperature|) °C

HMP155 operating environment

Operating temperature for humidity measur

ement

Storage temperature −80 … +60 °C (−112 … +140 °F)

Operating humidity 0 … 100 %RH

EMC (industrial environment) EN/IEC 61326-1, EN 55022

IP rating IP66

−80 … +60 °C (−112 … +140 °F)

HMP155 inputs and outputs

Operating voltage 7 … 28 VDC

Minimum operating voltage 0 … 1 V output or RS‑485: 7 V

Outputs Voltage output: 0 … 1 V, 0 … 5 V,

Average power consumption (+15 VDC, load 100 kΩ)

Settling time at startup Voltage output: 2 s

HMP155 mechanical speciﬁca

Dimensions (H × W) 279 × 40 mm (10.9 × 1.6 in)

Weight 86 g (3.0 oz)

Length of additional T‑pr

Connection 8-pin male M12 connector

Connection cables 3.5 m (11 ft 6 in), 10 m (32 ft 10 in),

Maximum wire size

Service cables USB connection cable

Materials

Filter Sintered Teﬂon or membrane

Housing Polycarbonate (PC)

Additional temperature probe Stainless steel AISI 316L

Cable PUR

obe cable 2 m (6 ft 7 in)

0 … 5 V output, or w 12 V 0 … 10 V output, chemical purge, or XHEAT: 16 V

0 … 10 V Resistive Pt100 4‑wire connection RS‑485

0 … 1 V output: < 3 mA 0 … 10 V output: +0.5 mA RS-485: < 4 mA During chemical purge: Maximum 110 mA With warmed probe: Maximum 150 mA

RS-485: 3 s

armed probe:

tions

30 m (98 ft 5 in)

0.129 mm2 (2

MI70 connection cable

6 AWG)

HMP155 accuracy over temperature range: voltage and RS‑485

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speciﬁcations — technical included — are subject to change without notice.

Dimensions in mm (inches)