
HMI41 Indicator and HMP42/HMP46 Probes
The Vaisala HUMICAP® Humidity Indicator HMI41 fitted
with the Vaisala HUMICAP® Humidity and Temperature
Probes HMP42 or HMP46 can be used for spot checking and
field calibration applications. In addition to displaying the
humidity and temperature readings, the HMI41 indicator
calculates dew point and wet bulb temperature, absolute
humidity and mixing ratio. The indicator has an easy-to-read
two line liquid crystal display. The display units (metric or
non-metric) are easily selected. These features, plus fast
response time, high measurement accuracy and excellent
stability, as well as the unique properties of the probe chosen –
either the HMP42 or the HMP46 – make the HMI41 indicator
and HMP42/46 combination an ideal choice for the most
demanding applications.
Features/Benefits:
• RH measurement range 0...100 %RH
• Temperature measurement range -40...+100 °C (-40 ... +212 °F), with the HMP46 only for short periods
up to +180 °C (+356 °F)
• Calculates dew point, wet bulb temperature, absolute humidity and mixing ratio
• Versatile and easy-to-use
• Incorporates Vaisala HUMICAPR Sensor
• Excellent stability
• Data collection with serial line
• NIST traceable (certificate included)
• Optional carrying case and calibration cable
Vaisala HUMICAP® Humidity and Temperature Probe HMP42
The HMP42 probe can be used for spot checking humidity and temperature in applications which require an
extremely thin probe. Typically the probe is used for monitoring the drying of structures during construction or
after water damage. It is ideal to be used when measuring in any tight places, in ducts or chambers or, for
example, under a linoleum floor. The probe diameter is only 4 mm, allowing access into very small, tight, and
hard-to-reach spaces.
Vaisala HUMICAP® Humidity and Temperature Probe HMP46
Typical applications for the HMP46 are plant maintenance, installation and inspection of air conditioning
systems, production and storage areas and production processes. The HMP46 operates in full humidity range of
0 ... 100 %RH. The temperature range is from -40 to +100 °C (-40 ... +212 °F). For short periods of time, the
probe can withstand temperatures up to +180 °C (+356 °F). The HMP46 probe is solid and rugged. Its stainless
steel probe is made to withstand rough handling in mechanically demanding applications. The probe’s long shaft
can also reach otherwise unreachable places.
High Performance Sensor
The HMP42/46 probes incorporate Vaisala HUMICAP®
Sensor. This sensor has high accuracy, excellent long-term
stability and negligible hysteresis. In addition, the sensor is
insensitive to dust, particulate dirt and most chemicals.
Call for pricing
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