Vaisala HMP155 Specs.pdf

HUMICAPâ Humidity and Temperature Probe HMP155

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

• Different 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 high-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.

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.

Vaisala HUMICAPâ Humidity and Temperature Probe HMP155 provides reliable humidity and temperature measurement. It is designed especially for demanding outdoor applications.

Technical Data

HMP155 humidity measurement performance Sensor HUMICAPâR2, 180R and INTERCAP for typical applications HUMICAPâR2C, 180RC and INTERCAPC for applications with chemical purge and/or warmed probe

Observation range 0 … 100 %RH

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

63 %: 20 s 90 %: 60 s

Factory calibration uncertainty at +20 °C (+68 °F)1)

±0.6 %RH (0 … 40 %RH)

±1.0 %RH (40 … 95 %RH)

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

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

±1.7 %RH (90 … 100 %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 standard deviation limits. Small variations possible (see also the calibration certificate).

HMP155 temperature measurement performance Sensor Pt100 RTD element, Class F 0.1

IEC 60751

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

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

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

Other measured variables Dew point / frost point temperature, wet bulb temperature, mixing ratio

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 607511)

±(0.1 + 0.0017 × |temperature|) °C

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

HMP155 accuracy over temperature range: voltage and

RS‑485

HMP155 operating environment Operating temperature for humidity measurement

−80 … +60 °C (−112 … +140 °F)

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

Operating humidity 0 … 100 %RH

IP rating IP66

HMP155 inputs and outputs Operating voltage 7 … 28 V DC

Minimum operating voltage 0 … 1 V output or RS‑485: 7 V 0 … 5 V output, or warmed probe:

12 V 0 … 10 V output, chemical purge, or

XHEAT: 16 V

Outputs Voltage output: 0 … 1 V, 0 … 5 V, 0 … 10 V Resistive Pt100 4‑wire connection

RS‑485

Average power consumption (+15 V DC, load 100 kΩ)

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

Settling time at startup Voltage output: 2 s RS-485: 3 s

HMP155 mechanical specifications Dimensions (H × W) 279 × 40 mm (10.9 × 1.6 in)

Weight 93 g (3.25 oz)

Length of additional T‑probe cable 2 m (6 ft 7 in)

Connection 8-pin male M12 connector

Connection cables 3.5 m (11 ft 6 in), 10 m (32 ft 10 in), 30 m (98 ft 5 in)

Maximum wire size 0.129 mm2 (26 AWG)

Service cables USB connection cable MI70 connection cable

Materials

Filter Sintered Teflon or membrane

Housing Polycarbonate (PC)

Additional temperature probe Stainless steel AISI 316L

Cable PUR

1.5

7]

24 [0.94] 86 [3.39]

279 [10.98] 266 [10.47] mm [in]

Dimensions in mm (inches)

Published by Vaisala | B210752EN-J © Vaisala Oyj 2021 www.vaisala.com All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners.

Any reproduction, transfer, distribution or storage of information contained in this document is strictly prohibited. All specifications — technical included — are subject to change without notice.