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Vaisala HM70 Hand-Held Humidity and Temperature Meter

Hand-Held Humidity and Temperature Meter

The Vaisala HUMICAP® Hand-Held 
Humidity and Temperature Meter  HM70 is designed for demanding humidity measurements in spot-checking applications. It is also ideal for field checking and calibration of Vaisala's fixed humidity instruments. The HM70 incorporates the latest generation of the Vaisala HUMICAP®Sensor. It is reliable and has better than ever long-term stability. Additionally, it has a sensor that copes well with chemical interference and provides accuracy that lasts in demanding conditions. 

The chemical purge option maintains measurement accuracy in environments with high concentrations of chemicals. The sensor pre-heat 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
The HMP75 is a general purpose probe whereas the HMP76 is a long, stainless steel probe especially suitable for spot-checking in ducts. The HMP77 is a small probe at the end of a 5-meter cable. The probe is ideal for difficult-to-reach areas and for on-site calibration of Vaisala's process transmitters. In addition, the HM70 supports the use of Vaisala's dewpoint, carbondioxide 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 and real time measurement data from the HM70 to a PC.

▪ Multilingual user interface
▪ Shows measurement trends graphically
▪ Proven Vaisala HUMICAP® Sensor technology
▪ 3 probe alternatives, temperature measurement ranges between -70 and +180 °C
▪ Multiprobe operation; dewpoint and CO2 probes can also be connected
▪ 2 probes can be connected simultaneously
▪ Displays various humidity parameters
▪ Sensor pre-heat and chemical purge options for demanding conditions
▪ NIST traceable (certificate included)
▪Carrying cases available

Relative humidity
Measurement range
0 ... 100 % RH
Accuracy (including nonlinearity, hysteresis and repeatability) 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 ±0.6 %RH (0 ... 40 %RH)
uncertainty (+20 °C / +68 °F) ±1.0 %RH (40 ... 97 %RH)
(Defined as ±2 standard deviation limits.)
Response time (90%) at +20 °C (+68 °F) in still air HMP75 (with standard plastic grid) 17 s
HMP76 (with standard sintered bronze filter) 60 s
HMP77 (with standard plastic grid and stainless
steel netting)
50 s
Sensor HUMICAP® 180R
HUMICAP® 180RC (chemical purge, sensor preheat)
Typical long-term stability better than 1 %RH / year
HMP75 -20 ... +60 °C (-4 ... +140 °F)
HMP76 -50 ... +120 °C (-58 ... +248 F)
short time -50 ... +180 °C (-58 ... +356 °F)
HMP77 -70 ... +180 °C (-94 ... +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (±0.36 °F)
Menu languages English, Chinese, French, Spanish, German,
Russian, Japanese, Swedish, Finnish
Display LCD with backlight, graphic trend display of any parameter, character height up to 16 mm
Max. no. of probes 2
Power supply Rechargeable NiMH battery pack with ACadapter or 4xAA-size alkalines, type IEC LR6 0
Analog output 0... 1 VDC
Output resolution 0.6 mV
PC interface MI70 Link software with USB or serial port cable
Data logging capacity 2700 points
Alarm audible alarm function
Operating temperature range -10 ... +40 °C (+14 ... +104 °F)
Operating humidity range non-condensing
Housing classification IP54
Battery operation time Continuous use 48 h typical at +20 °C (+68 F)
Data logging use up to a month, depending on logging interval
Electromagnetic Complies with EMC standard
compatibility EN61326-1, Portable Equipment

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