Vaisala HM34 Technical data
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HM34 Pocket Size Relative Humidity Meter
The Vaisala HUMICAP® Hand-Held
Humidity and Temperature Meter
HM34 provides a fast and convenient
way to accurately spot-check relative
humidity and temperature.
Fast and easy-to-use
In measurement mode, the
extendable probe just slides out.
Normally, measurement takes only
a few seconds. The HM34 meter
includes a HOLD button which
allows the user to retain an RH or T
measurement until it has been noted
or recorded.
If no buttons are pressed for three
minutes, the unit automatically
switches itself off. This automatic
POWER-OFF function prevents the
possibility of accidental discharge of
the HM34’s battery.
After the measurement is completed,
the probe is slid back into the meter
casing. Between spot checks, the
meter is normally stored in its
carrying case.
Features/Benefits
Ideal for spot checking
▪
humidity levels
Measurement range 0 ... 100 %RH
▪
Fast response with ±2%
▪
accuracy
Temperature measurement
▪
range -20 ... +60 °C
(-4 ... +140 °F)
Lightweight, pocket-sized
▪
Extendable probe
▪
Automatic POWER-OFF
▪
Features/Benefits
Incorporates Vaisala HUMICAP®
▪
Sensor that provides high
accuracy, excellent long-term
stability, neglible hysteresis,
and insensitivity to dust and
most chemicals
Available in either °F or °C
▪
NIST traceable (certificate
▪
included)
Each unit comes with a 9V
▪
battery, attached probe, 0.2
μm protective membrane filter
and a carrying case
The Vaisala HUMICAP® Hand-Held
Humidity and Temperature Meter
HM34 provides accurate spot checks of
humidity and temperature.
Technical data
Relative humidity
Measurement range 0 ... 100 %RH
Accuracy ±2% (0 ... 90 %RH)
±3% (90 ... 100 %RH)
Resolution 0.1 %RH
Temperature dependence ±0.04 %RH/°C
®
Sensor type HUMICAP
H thin film capacitive sensor
Response time (90%) 15 s with membrane filter
5 s with plastic grid
Temperature
Range -20 ... +60 °C (-4 ... +140 °F)
Accuracy ±0.3 °C (±0.54 °F)
Resolution 0.1 °C (0.1 °F)
Temperature dependence ±0.02 °C/°C (±0.02 °F/°F)
Sensor Pt 100 IEC 751 1/3 Class B
General
Display 3 1/2 digit LCD
Hold function Push-button hold of displayed value
Power supply 9 V battery
Battery operation time 50 h
Automatic POWER OFF after 3 minutes,
unless HOLD is activated
Operating temperature range -20 ... +60 °C (-4 ... +140 °F)
Housing ABC plastic
Sensor protection
standard plastic grid, part no. 6221
optional sintered filter 133 mm, part no. 0195
Weight 180 g with battery
Ordering Information
HM34C with °C temperature reading
HM34F with °F temperature reading
Electromagnetic compatibility Complies with EMC standard
EN61326-1, Portable Equipment
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Ref. B210909EN-B ©Vaisala 2009
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.
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