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 CO2 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)

Vaisala HUMICAPâ 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 diƒcult-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 Windowsâ software and the USB connection cable form a practical tool for transferring logged data from HM70 to a PC.

On-site calibration with HM70 Handheld Meter

Technical Data

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)
							±1.7 %RH (90 ... 100 %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							±0.6 %RH (0 ... 40 %RH)
(+20 °C / +68 °F)							±1.0 %RH (40 ... 97 %RH)
Response time (90%) at +20 °C (+68 °F) in still air:
HMP75 (with standard plastic grid)							17 s
HMP76 (with standard sintered bronze							60 s
filter)
HMP77 (with standard plastic grid and							50 s
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:
0.7	°C
0.6
0.5
0.4
0.3
0.2
0.1								°C
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7								80 100 120 140 160 180
-80 -60 -40 -20			0		20	40	60

Other Parameters Available

dew point, frost point, absolute humidity, mixing ratio, wet bulb temperature, water content, vapor pressure, saturation vapor pressure, enthalpy, water activity

General, HMP75, HMP76, and HMP77 Probes

Humidity sensor	HUMICAPâ 180R
	HUMICAPâ 180RC (chemical purge,
	sensor preheat)
Temperature sensor	Pt100 RTD Class F0.1 IEC 60751
Operating temperature range for	-40 ... +60 °C ( -40 ... +140 °F)
electronics
Standard Sensor Protection
HMP75	Plastic grid
HMP76	Sintered bronze filter
HMP77	Grid with SS netting

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	1.9 m (6.2 ft)
and probe handle)
Probe cable length of HMP77 (from	5.0 m (16 ft)
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)

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)
Compatibility
EMC compliance	EN61326-1, Portable Equipment
Other
Menu languages	English, Chinese, Spanish, Russian,
	French, Japanese, German, Swedish,
	Finnish
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 %CO2