Atec HMI41SETB5B User Manual

www.vaisala.com

HMI41 Indicator and HMP42/HMP46 Probes

The Vaisala HUMICAP® Humidity
Indicator HMI41 fitted with the Vaisala
HUMICAP
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.

®

Humidity and Temperature

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 HUMICAP®

▪

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
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 sensor

The Vaisala HUMICAP® Humidity
Indicator HMI41 equipped with the
Vaisala HUMICAP
Temperature Probe HMP42 – an
extremely thin probe allowing access
into very small, tight, hard-to-reach
spaces.

The Vaisala HUMICAP® Humidity
Indicator HMI41 equipped with the
Vaisala HUMICAP
Temperature Probe HMP46 – a rugged
stainless steel probe for mechanically
demanding and high temperature
applications.

®

Humidity and

®

Humidity and

Technical Data

HMI41 Indicator

Calculated variables dew point 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)

HMP42 Probe

HUMIDITY

Measurement range 0 ... 100 %RH
Accuracy (incl. non-linearity, hysteresis and repeatability)
at +20 °C (+68 °F)

0 … 90 %RH ±2 %RH

90 … 100 %RH ±3 %RH
Factory calibration uncertainty (+20 °C / +68 °F)

0 … 15 %RH ±1 %RH

15 … 78 %RH ±1.5 %RH
Temperature dependence of electronics ±0.05 %RH/°C
Typical long-term stability better than 1 %RH per year
Response time (90%) at +20 °C in still air 30 s

TEMPERATURE

Measurement range HMP42 -40 ... +100 °C (-40 ... +212 °F)

Temperature accuracy over measurement range

∆°C

0.6

0.4

0.2

0

-0.2

-0.4

-0.6

-40 -20 0 20 40 60 80 100
T/° C

Temperature sensor Pt100 RTD Class F0.3 IEC 60751

HMP46 Probe

HUMIDITY

Measurement range 0 ... 100 %RH, non-condensing
Accuracy (incl. non-linearity, hysteresis and repeatibility)
at +20 °C (+68 °F)

0 … 90 %RH ±1 %RH
90 … 100 %RH ±2 %RH

Factory calibration uncertainty (+20 °C / +68 °F)

0 … 15 % RH ±1 %RH
15 … 78 %RH ±1.5 %RH

Temperature Dependence

error %RH

2

1.5
1

0.5
0

-0.5

-1

-1.5

-2

-40

-20 20 60

0

40

T/°C

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

TEMPERATURE

Continuous measurement -40 ... +100 °C (-40 ... +212 °F)
Short-term measurement -40 ... +180 °C (-40 ... +356 °F)
Temperature accuracy at +20 °C (+68 °F) ±0.2 °C (±0.36 °F)

Temperature accuracy over the measurement range

°C

0.6

0.4

0.2

0

-0.2

-0.4

-0.6

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

Temperature sensor Pt100 RTD Class F0.1 IEC 60751

100

for temporary
use only

120

140

16080

180

180