Vaisala HMD70U Service Manual Page 56
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54
100
95
90
85
80
75
1
2
3
4 5
6 7
warmed probe
regular probe
100
95
90
85
80
75
1
2
3
4 5
6 7
warmed probe
regular probe
HMT330MIK Meteorological Installation Kit
The Vaisala Meteorological
Installation Kit HMT330MIK enables
the Vaisala HUMICAP
®
Humidity
and Temperature Transmitter
HMT337 to be installed outdoors to
obtain reliable measurements for
meteorological purposes.
True Humidity Readings in
Condensing Conditions
In weather observations dew
formation makes reliable humidity
measurement difficult. When dew has
formed on the humidity sensor, it is
impossible to obtain a true reading
until this dew evaporates.
Both the PTU307 and HMT337 avoid
this problem by warming the probe.
When warmed, the relative humidity
inside the probe stays below the
ambient level. With an accurate
temperature measurement, the
ambient dewpoint can be calculated
precisely. To obtain the ambient
relative humidity, an additional probe
measures the ambient temperature,
The HMT337 and PTU307 feature warmed probe technology. Installed with the
HMT330MIK kit either one forms the right choice for reliable humidity measurement
in humid weather conditions.
and the transmitter calculates the
relative humidity from the dewpoint
and temperature values.
Open Shield Prevents
Microclimates
The warmed probe of the HMT337/
PTU307 is mounted in a shield which
is open at the bottom to ensure steady
air circulation to the sensor even in
calm weather.
In traditional radiation shields sleet
or snow can accumulate on the shield
and prevent the proper air circulation
through the shield, and create a humid
microclimate until the snow melts.
Essential for Critical
Weather Measurements
Obtaining a true humidity reading is
particularly important e.g. in traffic
safety: at airports and at sea as well
as on the roads. It is essential, for
example, in fog and frost prediction.
Features/Benefits
▪
For outdoor humidity and
temperature measurements
▪
Can be ordered in a variety of
configurations
▪
Used together with HMT337
transmitter or PTU307
▪
Vaisala SPH 10/20 Static
Pressure Head eliminates
effectively pressure variations
in the barometer caused by
wind
HMT337/PTU307 Features
▪
Warmed probe provides
true humidity readings in
condensing conditions
▪
Humidity measurement
expressed as relative humidity
and/or dewpoint temperature
▪
Easy field calibration with the
HM70 hand-held meter
After a period of 100 % relative humidity,
the warmed probe measures the true
humidity, whereas the non-warmed
probe takes time to recover from the
condensation.
For calibration, a portable HMP77
reference probe is easy to attach beside
the HMT337 or PTU307 probe.
- HUMIDITY / DEW POINT / 1
- PRESSURE / WEATHER 1
- ACC URATE 2
- Humidity 4
- Dew Point 4
- Mounting Options 9
- Graphical Display of 10
- History and 10
- Measurement Trends 10
- Outputs and Power Supply 10
- Options for Every Need 10
- Flexible Installation 11
- For Moderate Humidities 11
- Vaisala HUMICAP® 12
- Performance 12
- Measurement Trends and 12
- Real Time History 12
- 41 (1.6) 13
- 51 (2.0) 13
- 192 (7.56) 13
- 253 (9.96) 13
- 37.5 (1.48) 14
- 79.5 (3.13) 14
- 99.5 (3.92) 14
- Temperature Transmitters 16
- HMP361 for wall mounting 17
- HMP363 for confined spaces 17
- HMP364 for high pressure 17
- HMP365 for high temperature 18
- HMP367 for high humidities 18
- HMP368 for pressurized 18
- Transmitter 22
- Interchangeable Probe 24
- Fast, On-Site Calibration 26
- Measures both Humidity 26
- Resistant to Chemicals 28
- Vaisala INTERCAP 30
- Humidity and Temperature 30
- Transmitter Series HMW80 30
- HVACApplications 32
- Demanding Applications 34
- Unique Warmed Probe 34
- Vaisala HUMICAP® Sensor 34
- Chambers 36
- Probe HMP60 38
- Vaisala HUMICAP 40
- Probe HMP110 40
- Three Probes 42
- MI70 Link 42
- Reliable and Cost-ecient 47
- HVAC Products 47
- Fast and Easy-to-Use 48
- HMK15 Humidity Calibrator 50
- DTR500 Solar Radiation 54
- Versatile Outputs and 61
- (Wireless) Data Collection 61
- Easy Installation 61
- Probe Specifications 62
- Ensure dry 65
- Measure Humidity Directly 66
- DMT345, Accurate in Hot 66
- OEM Applications 70
- Low Maintenance 72
- Dewpoint temperature (°C) 75
- DMT132 Dewpoint Transmitter 76
- DEW POINT 77
- CALCULATED VARIABLES 77
- Indoor Applications 78
- 110 (4 .33) 79
- 85 (3.35) 79
- 33 (1.30) 79
- DSS70A Portable 82
- Sampling System 82
- Sampling Cells for 82
- Pressurized Processes 82
- Online Reliability 86
- Savings Across the Board 86
- Risk-Free, Greener 86
- Solution 86
- The Fruit of Experience 86
- Multiparameter Transmitter 88
- When Moisture is a Problem 89
- Knowledge is Power 89
- Literally 89
- Transmitter Series for Oil 90
- Moisture in Oil 90
- The Vaisala HUMICAP 91
- Hand-Held 91
- R1/2" ISO7/1 92
- Prevent it 95
- Transmitter for Oil 96
- Features/Benefits 100
- Technical Data 101
- 0 ... 2 % 102
- Interchangeable Probes 104
- Demanding OEM Applications 106
- GMM111 Carbon Dioxide Module 108
- Vaisala CARBOCAP 110
- Technology 110
- Two Sampling Methods 110
- Features/Benefi ts 112
- Demand-controlled Ventilation 114
- GMM112 Carbon Dioxide Module 118
- GMM20W Carbon Dioxide Module 120
- Pressure 122
- PTU300 Models 123
- Mechanics 126
- Accessories 126
- Dimensions 126
- IN CONTROLLED ENVIRONMENTS 127
- Take the Lab to the Field 130
- For more information, visit 131
- Standard PTB330TS 132
- PTB210 Digital Barometer 134
- Calculate 137
- Vaisala BAROCAP® 138
- Accuracy and Stability 138
- Applications 138
- Ideal for outdoor 140
- Carefree maintenance 140
- Operating Environment 142
- Available Options 142
- Figure 1 143
- Figure 2 with Process 143
- Valve Actuator and 143
- Test Jacks 143
- Measuring Acoustic 146
- Precipitation 146
- Wind Measurement 150
- Vaisala Service Offering 152
- Accredited Body 153
- Accredited Parameters 153
- Vaisala Filters 154
- Vaisala Filters continued 155
- Vaisala Contact Information 158
- ASIA AND PACIFIC 159
- NORTH AMERICA 159
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