Vaisala HUMICAP, HMP155 User Manual

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

HUMICAPâ Humidity and

Temperature Probe HMP155

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

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

HMP155 humidity measurement performance

Sensor	HUMICAPâ180R and 180R2 for typical
	applications
	HUMICAPâ180C and 180R2C for
	applications with chemical purge
	and/or warmed probe

Observation range	0 … 100 %RH
Response time at +20 °C (+68 °F) in	63 %: 20 s
still air with sintered Teflon filter	90 %: 60 s

Factory calibration uncertainty at	±0.6 %RH (0 … 40 %RH)
+20 °C (+68 °F)1)	±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	63 %: < 20 s
temperature probe in 3 m/s (7 mph) air	90 %: < 35 s
flow

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	±(0.1 + 0.0017 × \|temperature\|) °C
IEC 607511)
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	−80 … +60 °C (−112 … +140 °F)
measurement

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

HMP155 inputs and outputs

Operating voltage	7 … 28 VDC

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 VDC,	0	… 1 V output: < 3 mA
load 100 kΩ)	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		86 g (3.0 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
	279 [10.98]
		266 [10.47]
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Dimensions in mm (inches)

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