Vaisala HM34 User Manual [en, de, fr]
User's Manual
Mode d'emploi
Bedienungsanleitung
Käyttöohje
HM34
Humidity and Humidité- et
temperature meter températuremétre
Feuchtigkeits- und Kosteus- ja
Temperaturmeter lämpötilamittari
Ref. HM34-U262en-1.1
CONTENTS Page
1. Product description 1
2. Operation 2
3. Calibration and maintenance 3
4. Spare parts and accessories 4
5. Technical specifications 5
TABLE DES MATIERES Page
1. Description de l'appareil 7
2. Mode d'emploi 8
3. Etalonnage et entretien 9
4. Pieces detachees et accessoires 10
5. Caracteristiques techniques 11
INHALT Seite
1. Beschreibung 13
2. Bedienung 14
3. Eichung und Wartung 15
4. Ersatzteile und Zubehör 16
4. Technicshe Daten 17
SISÄLTÖ Sivu
1. Tuotekuvaus 19
2. Käyttö 20
3. Kalibrointi ja huolto 21
4. Varaosat ja lisätarvikkeet 22
5. Tekniset tiedot 23
WARRANTY - GARANTIE- GARANTIE - TAKUU 25
USERS' MANUAL
HM34
Relative humidity and
temperature meter
1. PRODUCT DESCRIPTION
The HM34 is a battery-operated pocket-size meter for the measurement of ambient relative humidity and temperature. The
humidity and temperature sensors are housed at the tip of an
extendable probe, where a semipermeable membrane filter
protects the humidity probe against water and dust. For easy use,
the meter features a HOLD function for the display and an
automatic power-off function.
For humidity measurement, the HM34 utilizes Vaisala's highaccuracy, high-reliability HUMICAP
sensor. Temperature measurement is based on a Pt 100 tempera-
ture sensor.
The meter is intended for ambient measurements in such applications as:
- spot checks
- industrial monitoring and inspections
- occupational health and safety
- laboratory and research use
The meter is available with the display calibrated for either
degrees Celsius (°C) or degrees Fahrenheit (°F).
®
humidity sensor, the H-
1
2. OPERATION
The meter has four function pushbuttons and a display (Fig. 3).
1. On/off pushbutton (ON/OFF)
To switch the power on, press the ON/OFF pushbutton. This will
automatically start the measurement of relative humidity (%RH).
2. Temp measurement pushbutton (TEMP)
For temperature measurement, press the TEMP pushbutton.
TEMP measurement mode is indicated by a (+) or a (-) on the
display. Display calibration is either in degrees Celsius (°C) or
Fahrenheit (°F) as marked on the sticker on the backside of the
meter.
3. RH measurement pushbutton (%RH)
Relative humidity is always positive. If a colon (:) is indicated in
front of the displayed reading, the meter reads "negative" RH.
This condition may occur e.g. when the meter has not been
calibrated after sensor change.
4. Reading hold pushbutton (HOLD)
Pressing the HOLD pushbutton locks the reading in the display.
A (s) indicates the HOLD mode. The meter remains in HOLD
mode until measurement is resumed by pressing any of the
pushbuttons except ON/OFF.
5. Low battery indication
When battery voltage is low, a (B) is displayed. To ensure
troublefree operation, replace the battery after about 50 h of
operation.
Automatic power-off
The meter automatically switches off after about 3 minutes,
unless a pushbutton is pressed or the meter is set in HOLD mode.
Operating voltage
The meter uses a standard 9 V transistor battery (type IEC 6F22).
The battery is located under a protective lid on the backside of
the meter (Fig. 2).
2
3. CALIBRATION AND MAINTENANCE
Calibration and maintenance of the meter should be performed
at regular intervals which depend on the conditions of use and
the desired accuracy, but at least once a year. A one point
calibration may be performed for the HM34 meter by adjusting
the trimmer potentiometer marked "DRY" (Fig. 2). This field
calibration can be performed against a calibrated Vaisala humidity meter. For a higher-accuracy two-point calibration use a
Vaisala HMK11 calibrator and saturated salt solutions as described in the Operating Manual of the HMK11. The calibration
is done first for the dry end and then for the wet end by adjusting
trimmer potentiometers "DRY" and "WET" respectively. The
potentiometers are located under the protective lid of the battery
compartment (Fig. 2).
Replacing the sensors
When you replace a defective H-sensor package with a new one,
make sure you handle the package with care. After installation,
calibrate the humidity sensor. If the "WET" trimmer potentiometer
has not been adjusted from its factory setting, a one point
calibration is sufficient. Otherwise, perform a two point calibration with an HMK11 calibrator. Replacement of the Pt 100
temperature sensor requires no recalibration.
3
Chemical tolerance of the humidity sensor (HUMICAP® )
Long-term exposure of the sensor to certain chemicals and gases
may shorten its life. The following list gives suggested maximum
ambient concentrations for some typical chemicals:
1. Organic solvents: 1000...10 000 ppm (typ.)
2. Aggressive chemicals:
(e.g. strong acids such as
SO
3. Weak acids: 100...1000 ppm (typ.)
4. Bases: 10 000...100 000 ppm (typ.)
Detailed information on allowed concentrations are available on
request from your Vaisala representative.
, H2S, HCl, Cl2 etc.) 1...10 ppm (typ.)
2,H2SO4
4. SPARE PARTS AND ACCESSORIES
Part no.
HUMICAP
Temperature sensor Pt 100
(1/3 DIN 43760B) 10429
Sintered filter 133
Plastic grid 6221
HMK11 humidity meter calibrator
Battery IEC 6F22 0332
®
H-sensor 15202
µm 0195
4
5. TECHNICAL SPECIFICATIONS
Measurement range
humidity 0...100 %RH
temperature -20...+60
Accuracy (at +20
(including nonlinearity and hysteresis)
relative humidity
against factory references
against field references
temperature
NOTE:
When the HM34 is used in an electromagnetic field of 3 V/m,
with the frequency of 200 - 220 Mhz, the temperature
deviation is max. ±3 °C.
Temperature dependence:
Resolution: 0.1 %RH
Response time for
humidity (at +20 °C): 15 s
Display: 3
HOLD function: pushbutton hold
Supply voltage: 9 V battery (IEC 6F22)
Battery operating time: 50 h (typ.)
Automatic power-off: after 3 minutes, unless
°C):
+2 %RH (0...90 %RH)
+3 %RH (90...100 %RH)
+0.3 °C (+0.5 °F)
for displayed value
HOLD is activated
°C or
-4...+140
+1 %RH
+0.04 %RH/°C
+0.02 °C/°C
0.1 °C (0.1 °F)
1
/2-digit LCD
°F
5
Sensors
Humidity: HUMICAP
Temperature: Pt 100 (1/3 DIN 43760B)
Sensor protection:
standard plastic grid
optional 133 µm sintered filter
Weight: 250 g
Ordering information: HM34C
(with °C temp. display)
(with °F temp. display)
Information and specifications in this manual subject to
change without notice.
Copyright Vaisala Oy, 1996.
HUMICAP is a registered trademark of the Vaisala Company.
®
H-sensor
(part no. 15202)
(part no. 6221)
(part no. 0195)
HM34F
6
MANUEL D'UTILISATION
HM34
Appareil de mesure
de l'umidité et de la
temperature
1. DESCRIPTION DE L'APPAREIL
Le HM34 est un appareil de mesure destiné aux mesures de
température et d'humidité relative. Les capteurs de température
et d'humidité sont situés à la pointe de la sonde rétractable et le
capteur de température est protégé par un filtre à membrane.
L'appareil possède une fonction de maintien de la valeur lue et
un arrêt automatique.
Le HM34 est un appareil de grande précision et très fiable, équipé
du capteur-H performant de Vaisala, HUMICAP
de tempétature Pt 100.
Cet appareil de mesure fonctionnant sur pile convient aux
applications suivantes:
- surveillance des locaux
- industrie
- protection du travail
- laboratoires et recherche
Le HM34 est disponible avec des échelles de mesure Celsius
(°C) ou Fahrenheit (°F).
®
et du capteur
7
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