HMI 41 Technical Data
HMI41 Indicator and
HMP46 High Temperature Probe
Features/Benefits
• RH measurement range 0 ... 100 %RH
• Temperature measurement range The Vaisala HUMICAP® Humidity
Indicator HMI41 equipped with
the Vaisala HUMICAP® Humidity
and Temperature Probe HMP46
is an ideal combination for spot
checking and field calibration.
The Vaisala HUMICAP® Humidity
Indicator HMI41 fitted with the Vaisala
HUMICAP® Humidity and 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 field checking Vaisala's
humidity transmitters.
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.
40
-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 download capability
• NIST traceable (certificate included)
• Optional carrying case and calibration cable
• Available as a complete calibration kit HMK41
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.
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. 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.
Vaisala Instruments Catalog 2009
Ref. B210768EN rev. A
HMI41&HMP46
HUMIDITY
DEWPOINT
Technical Data
HMI41 indicator
General
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)
Typical ranges of calculated variables
dewpoint temperature
-20 ... +100 °C (-4 ... +100 °F)
absolute humidity
0 ... 600 g/m3
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.
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
ERROR2(
FORTEMPORARY
USEONLY
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
Accessories
Transmitter calibration cables
Cable Part #
for Calibrating
19116ZZ
HM60/70’s, HM140’s, HMM22D, HMW61/71
19164ZZ
HMP230’s, HMM210
19165ZZ
HM20/30’s, HMP130’s, HMM30C
25916ZZ
HMT360’s for use in ‘safe’ zones
25917ZZ
HMT330's
Carrying case for HMI41 & HMP46
plastic
part no. 210614
aluminum
part no. MI70CASE2
Serial communication cable part no. 19446ZZ
Dimensions
Dimensions in mm.
4 #
Typical long-term stability
Response time (90%)
at +20°C in still air w/sintered filter
Humidity sensor
better than 1 %RH per year
HMI41
HMP46
15 s
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
#
4 #
Temperature sensor
Vaisala Instruments Catalog 2009
Ref. B210768EN rev. A
Pt 100 IEC 751 1/3 class B
HUMICAP® is a registered trademark of Vaisala.
Specifications subject to change without prior notice.
© Vaisala Oyj
41
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