Vaisala HM70 Datasheet
HM70 Handheld Humidity and
Temperature Meter
For Spot-Checking and Field Calibration
Features
• Designed for spot-checking and
field calibration
• Multilingual user interface
• Shows measurement trends
graphically
• Proven Vaisala HUMICAPâ sensor
technology
• 3 probe alternatives, temperature
measurement ranges between
-70 and +180 °C (-94 and
+356 °F)
• 2 probes: also dew point and CO
probes can be connected
simultaneously
• Displays various humidity
parameters
• Sensor preheat and chemical
purge options for demanding
conditions
• Data can be logged and
transferred to a PC via MI70 Link
software
• 6-point traceable calibration
(certificate included)
2
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Vaisala HUMICAP
Handheld Humidity and Temperature Meter HM70 is designed for
demanding humidity measurements in spot-checking applications. It is also ideal as
an on-site calibrator for Vaisala's fixed humidity instruments.
Vaisala HUMICAPâ Technology
HM70 incorporates the world-class
HUMICAPâ sensor, one of the most
reliable and stable sensors on the
market. The HUMICAPâ sensor copes
well with chemical interference and
provides accuracy that lasts in
demanding conditions.
Chemical Purge
The chemical purge option maintains
measurement accuracy in environments
with high concentrations of chemicals.
The sensor preheat option reduces
measurement delays as it keeps the
sensor dry when the probe is inserted
into hot and humid processes.
Three Probes to Choose From
HMP75 is a general purpose probe,
whereas HMP76 is a long, stainless steel
probe especially suitable for spotchecking in ducts. HMP77 is a small
probe at the end of a 5-meter cable. The
probe is ideal for dicult-to-reach areas
and for on-site calibration of Vaisala's
process transmitters. In addition, HM70
supports the use of Vaisala's dew point,
carbon dioxide, and moisture in oil
probes, allowing measurements in
several multiparameter applications.
MI70 Link
The optional MI70 Link Windows
software and the USB connection cable
form a practical tool for transferring
logged data from HM70 to a PC.
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On-site calibration with HM70
Handheld Meter
Technical Data
°C
°C
0
0-80 -60 -40 -20 20 40 60 80 100 120 140 160
180
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Measurement Performance, HMP75, HMP76, and
HMP77 Probes
Relative Humidity
Measurement range 0 ... 100 %RH
Accuracy including non-linearity, hysteresis and repeatability. Defined as ±2
standard deviation limits:
At +15 ... +25 °C (+59 ... +77 °F) ±1 %RH (0 ... 90 %RH)
At -20 ... +40 °C (-4 ... +104 °F) ±(1.0 + 0.008 x reading) %RH
At -40 ... +180 °C (-40 ... +356 °F) ±(1.5 + 0.015 x reading) %RH
Factory calibration uncertainty
(+20 °C / +68 °F)
Response time (90%) at +20 °C (+68 °F) in still air:
HMP75 (with standard plastic grid) 17 s
HMP76 (with standard sintered bronze
±1.7 %RH (90 ... 100 %RH)
±0.6 %RH (0 ... 40 %RH)
±1.0 %RH (40 ... 97 %RH)
60 s
Mechanical Specifications, HMP75, HMP76, and
HMP77 Probes
IP rating IP65 (NEMA 4)
Housing material ABS/PC blend
Probe material Stainless steel (AIS316L)
Probe cable length (between indicator
and probe handle)
Probe cable length of HMP77 (from
handle to the root of probe)
Probe diameter 12 mm (0.47 in)
Weight
HMP75 250 g (8.8 oz)
HMP76 350 g (12 oz)
HMP77 500 g (18 oz)
1.9 m (6.2 ft)
5.0 m (16 ft)
filter)
HMP77 (with standard plastic grid and
stainless steel netting)
Typical long-term stability Better than 1 %RH / year
Temperature
HMP75 measurement range -20 ... +60 °C (-4 ... +140 °F)
HMP76 measurement range -50 ... +120 °C (-58 ... +248 °F)
HMP76 short time measurement range -50 ... +180 °C (-58 ... +356 °F)
HMP77 measurement range -70 ... +180 °C (-94 ... +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (±0.36 °F)
Accuracy over temperature range:
50 s
MI70 Measurement Indicator
Operating Environment
Operating temperature -10 ... +40 °C (+14 … +104 °F)
Operating humidity 0 ... 100 %RH, non-condensing
Storage temperature -40 ... +70 °C (-40 ... +158 °F)
Inputs and Outputs
Max. no of probes 2
Power supply Rechargeable NiMH battery pack with
AC adapter or 4xAA size alkalines,
type IEC LR6
PC interface MI70 Link software with USB or serial
port cable
Analog Output
Scale 0 ... 1 VDC
Output resolution 0.6 mV
Accuracy 0.2 % full scale
Temperature dependence 0.002 %/˚C (0.01 %/˚F) full scale
Minimum load resistor 10 kΩ to ground
Mechanical Specifications
Housing classification IP54
Housing materials ABS/PC blend
Weight 400 g (14 oz)
Other Parameters Available
dew point, frost point, absolute humidity, mixing ratio, wet bulb temperature,
water content, vapor pressure, saturation vapor pressure, enthalpy, water
activity
Compatibility
EMC compliance EN61326-1, Portable Equipment
Other
Menu languages English, Chinese, Spanish, Russian,
French, Japanese, German, Swedish,
Finnish
General, HMP75, HMP76, and HMP77 Probes
Humidity sensor HUMICAPâ 180R
Temperature sensor Pt100 RTD Class F0.1 IEC 60751
Operating temperature range for
electronics
Standard Sensor Protection
HMP75 Plastic grid
HMP76 Sintered bronze filter
HMP77 Grid with SS netting
HUMICAPâ 180RC (chemical purge,
sensor preheat)
-40 ... +60 °C ( -40 ... +140 °F)
Display
• LCD with backlight
• Graphic trend display of any
parameter
• Character height up to 16 mm
(0.63 in)
Alarm Audible alarm function
Data logging capacity 2700 real time data points
Logging interval 1 s to 12 h
Logging duration 1 min ... memory full
Resolution 0.01 %RH, 0.01 °C/°F, 0.01 hPa,
0.01 aw, 10 ppm / 0.01 %CO
2
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