Vaisala HMI41 Technical data

HMI41 Indicator and
HMP46 High Temperature Probe

www.vaisala.com

The Vaisala HUMICAP® Humidity
Indicator HMI41 equipped with the
Vaisala HUMICAP
Temperature Probe HMP46 is an ideal
combination for spot checking and field
calibration.

®

Humidity and

The Vaisala HUMICAP® Humidity
Indicator HMI41 tted with the
Vaisala HUMICAP
Temperature Probe HMP46 can be
used for spot checking humidity
and temperature in ducts or
chambers. Typical applications
are plant maintenance, installation
and inspection of air conditioning
systems, production and storage
areas and production processes.
In addition, it is suitable for eld
checking Vaisala's humidity
transmitters.

®

Humidity and

Withstands high
temperatures

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.

Versatile and easy to use

In addition to displaying the humidity
and temperature readings, the HMI41
indicator calculates dewpoint 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.

Features/Benefits

RH measurement range

▪

0 ... 100 %RH

Temperature measurement

▪

range -40 ... +100 °C
(-40 ... +212 °F),
for short periods up to +180 °C
(+356 °F)

Calculates dewpoint, wet bulb

▪

temperature, absolute humidity
and mixing ratio

Versatile and easy-to-use

▪

Incorporates Vaisala HUMICAP®

▪

Sensor

Excellent stability

▪

Data collection with serial line

▪

NIST traceable (certificate

▪

included)

Optional carrying case and

▪

calibration cable

Available as a complete

▪

calibration kit HMK41

These features, plus fast response
time, high measurement accuracy
and excellent stability, as well as
the wide temperature range of the
probe, make the HMI41/HMP46
combination an ideal choice for the
most demanding applications.

High performance sensor

The HMP46 probe incorporates
Vaisala HUMICAP
sensor has high accuracy, excellent
long-term stability and negligible
hysteresis. In addition, the sensor is
insensitive to dust, particulate dirt
and most chemicals.

®

Sensor. This

Technical data

-40

0

40

16080

120

2

1

0

-1

-2

-20 20 60

100

140

180

1.5

0.5

-0.5

-1.5

error %RH

T/°C

for temporary
use only

°C

-40 -20 0 20 40 60 80 100 120 140 160
T/°C

0.6

0.4

0.2

-0.2

-0.4

-0.6

0

180

HMI41 indicator

Calculated variables dewpoint temperature,

absolute humidity,

wet bulb temperature, mixing ratio
Resolution 0.1 %RH; 0.1 °C/°F
Power supply 4 batteries, type AA (LR 6)
Battery operation time

(alkaline batteries) 72 h continuous use
Auto-off function
Operating temperature -20 ... +60 °C (-4 ... +140 °F)
Storage temperature -40 ... +70 °C (-40 ... +158 °F)
Display two line LCD
Housing material ABS plastic
Housing classification IP53 (with connectors blocked)
Weight (incl. batteries) 300 g
Maximum measurement error of indicator at +20 °C

humidity ±0.1 %RH

temperature ±0.1 °C (±0.18 °F)

HMP46 probe

HUMIDITY

Measurement range 0 ... 100 %RH, non-condensing
Accuracy (incl. nonlinearity, hysteresis and repeatibility) at +20 °C

Maximum achievable accuracy when calibrated against

high quality, certified humidity standards:

0 ... 90 %RH ±1 %RH
90 ... 100 %RH ±2 %RH

When calibrated against salt solutions (ASTM E104-85)

0 ... 90 %RH ±2 %RH
90 ... 100 %RH ±3 %RH

Temperature Dependence

Typical long-term stability better than 1 %RH per year
Response time (90%)
at +20 °C in still air w/sintered filter 15 s
Humidity sensor HUMICAP

®

180

TEMPERATURE

Continuous measurement -40 ... +100 °C (-40 ... +212 °F)
Short-term measurement -40 ... +180 °C (-40 ... +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (±0.36 °F)
Accuracy over the measurement range

Temperature sensor Pt 100 IEC 751 1/3 class B

General

Typical ranges of calculated variables

dewpoint temperature -20 ... +100 °C (-4 ... +100 °F)
absolute humidity 0 ... 600 g/m
wet bulb temperature 0 ... 100 °C (32 ... 212 °F)

mixing ratio 0 ... 600 g/kg d.a.
The accuracies of these calculated variables are limited by the
accuracies of the measured variables on which they are based,
namely RH and T. The RH and T accuracies are stated under
HMP46 probe.

Cable length 1500 mm; extended spiral cable
Operating temperature range

for electronics -20 ... +60 °C (-4 ... +140 °F)
Housing material

Electronics housing ABS plastic

Probe stainless steel
Housing classification

electronics IP65 (NEMA 4)
Sensor protection sintered filter, part no. 0195

optionmembrane filter, part no. 10159HM (max +80 °C / +176 °F)

plastic grid, part no. 6221 (max +80 °C / +176 °F)
Weight 450 g
Electromagnetic compatibility Complies with EMC standard

EN61326-1, Portable Equipment

3

For more information, visit
www.vaisala.com or contact
us at [e-mail]

Ref. B210940EN-A ©Vaisala 2010

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