
www.vaisala.com
50 51
HMP41, HMP42 and HMP45 Probes
for HMI41 Indicator
Vaisala HUMICAP
®
Humidity Indicator
HMI41 can be used with any one of
the four probes to quickly and easily
measure humidity and temperature,
and to make other measurement
calculations such as dewpoint, wet
bulb temperature, absolute humidity
and mixing ratio.
The HMI41 has an easy-to-read LCD
display. Temperature readout is
available in either degrees Centigrade
or Fahrenheit. Calculated variables
are available in metric and non-
metric format.
Ideal for spot checking
applications
The HMI41 indicator with probes
is ideal for use in a variety of spot
checking applications such as plant
maintenance, air-conditioning system
installation and inspection, freezers
and storage and production areas.
Vaisala HUMICAP®
Humidity and
Temperature Probe
HMP41:
This probe is x-mounted directly
on the HMI41 indicator. It can be
upgraded to an HMP45 by purchasing
the HMH45 handle and cable option.
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,
such as:
r GPSNPOJUPSJOHUIFESZJOHPG
structures during construction or
after water damage
The HMI41 indicator with the HMP41
probe.
HMI41 with the HMP42 probe.
HMI41 with the HMP45 probe.
r JOUJHIUQMBDFT
r JOEVDUTPSDIBNCFST
r VOEFSBMJOPMFVNGMPPS
The probe diameter is only 4 mm,
allowing access into very small, tight,
and hard-to-reach spaces.
Vaisala HUMICAP®
Humidity and
Temperature Probe
HMP45:
This probe for general purposes
features an extended spiral cable.
Vaisala HUMICAP®
Humidity and
Temperature Probe
HMP46:
See preceding data sheet.
Features/Benefits
▪
Humidity measurement range
0 ... 100 %RH
▪
Temperature measurement
range HMP41, HMP45: -20 ...
+60 °C (-4 ... +140 °F) HMP42:
-40 ... +100 °C (-40 ... +212 °F)
▪
For spot checking
measurements
▪
Versatile and easy-to-use
▪
The HMI41 Indicator can be
used with any of the four
available probes
▪
Extremely thin 4 mm probe
head (HMP42)
▪
Incorporates Vaisala HUMICAP®
Sensor, which provides high
accuracy, excellent long-term
stability, neglible hysteresis,
and insensitivity to dust and
most chemicals
▪
NIST traceable
(certificate included)
Technical data
HMP41, HMP42, and HMP45 probes
HUMIDITY
Measurement range 0 ... 100 %RH
Accuracy at +20 °C (+68 °F)
when calibrated against salt
solutions (ASTM E014-85)
±2 %RH (0 ... 90 %RH)
±3 %RH (90 ... 100 %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 (HMP41, HMP45) 15 s
(HMP42) 30 s
Sensor HMP41 & 45 HUMICAP
®
180
Sensor HMP42 HUMICAP
®
MINI
TEMPERATURE
Measurement range probe
HMP41, HMP45 -20 ... +60 °C (-4 ... +140 °F)
HMP42 -40 ... +100 °C (-40 ... +212 °F)
Temperature accuracy over measurement range
Sensor (HMP41 & 45) PT 1000 IEC 751 1/3 class B
(HMP 42) PT 100 IEC 751 class B
General
Typical ranges of calculated variables
dewpoint temperature -20 ... +60 °C (-4 ... +140 °F)
absolute humidity 0 ... 160 g/m
3
wet bulb temperature 0 ... +60 °C (32 ... +140 °F)
mixing ratio 0 ... 160 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 above in the
probe section.
Cable length (HMP42 & 45) 1500 mm; extended spiral cable
Operating temperature range
HMP41 -20 ... +60 °C (-4 ... +140°F)
HMP42 -40 ... +100 °C (-40 ... +212 °F)
HMP45 -40 ... +60 °C (-40 ... +140 °F)
Dimensions
Dimensions in mm.
Accessories
Serial interface cable 19446ZZ
Carrying case for HMI41 and HMP41/45 HM36736
Aluminum case for HMP41/42/45/46 MI70CASE2
Rigid plastic case for HMP41/42/45/46 210614
HMP42
Calibration adapter HM37067
Rubber sleeve set 19809HM
HUMICAP
®
is a registered trademark of Vaisala.
HMI41 HMP41 HMP42 HMP45
Ref. B210941EN-A ©Vaisala 2010
This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifications — technical included — are subject
to change without notice.
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Battery operation time (alkaline batteries) 72 h continuous use
Housing material ABS plastic
Housing classification, electronics IP65 (NEMA 4)
Sensor protection
HMP41 & 45 plastic grid HM46717
option membrane filter 2787HM
HMP42 steel grid 19867HM
membrane tube set (5pcs) 19858HM
Weight
HMP41 30 g
HMP42 200 g
HMP45 160 g
Electromagnetic compatibility Complies with EMC standard
EN61326-1, Portable Equipment.
Ø 18.5
Ø 21
237
118
13
106
30
38
Ø 18.5
80
37
318
30
88
200
75
125
Komentáře k této Příručce