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60
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 dif cult. 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 traf c
safety: at airports and at sea as well
as on the roads. It is essential, for
example, in fog and frost prediction.
Features/Benefi ts
▪
For outdoor humidity and
temperature measurements
▪
Can be ordered in a variety of
confi gurations
▪
Used together with HMT337
transmitter or PTU307
▪
Vaisala SPH 10/20 Static
Pressure Head eliminates
e ectively pressure variations
in the barometer caused by
wind
HMT337/PTU307 Features
▪
Warmed probe provides
truehumidity readings in
condensing conditions
▪
Humidity measurement
expressed as relative humidity
and/or dewpoint temperature
▪
Easy fi eld calibration with the
HM70 hand-held meter
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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
- Vaisala – at your service 5
- Dew Point 6
- Building Automation 8
- Cleanrooms and Chambers 9
- Humidity 12
- Graphical display of 16
- Outputs and power supply 16
- Flexible installation 17
- For moderate humidities 17
- Vaisala HUMICAP® 18
- 41 (1.6) 19
- 51 (2.0) 19
- 192 (7.56) 19
- 253 (9.96) 19
- True humidity readings 20
- Many ways to install 20
- Technical Data 21
- Accessories 21
- Dimensions 21
- Temperature Transmitters 22
- HMP361 for wall mounting 23
- HMP363 for confined spaces 23
- HMP364 for high pressure 23
- HMP365 for high temperature 24
- HMP367 for high humidities 24
- HMP368 for pressurized 24
- Transmitter 28
- Performance 30
- Available options 30
- Annual calibration 30
- Indoor Applications 32
- Measures both humidity 34
- Fast, on-site calibration 34
- Resistant to chemicals 34
- Low maintenance costs 38
- Selectable functions 38
- (HMD/W50) 38
- Demanding applications 40
- Unique warmed probe 40
- Vaisala HUMICAP® Sensor 40
- Chambers 42
- Vaisala INTERCAP 44
- Humidity and Temperature 44
- Probe HMP60 44
- Vaisala HUMICAP 46
- Probe HMP110 46
- Three probes 48
- MI70 Link 48
- HMI41 Indicator and 50
- HMP46 High Temperature Probe 50
- Fast and easy-to-use 54
- HMK15 Humidity Calibrator 56
- DTR500 Solar Radiation and 60
- Precipitation Shields 60
- Versatile outputs and 67
- (wireless) data collection 67
- Easy installation 67
- DMT347 with Small Sized Probe 68
- DMT348 with Probe for 68
- Pipeline Installations 68
- Ensure dry 71
- Measure humidity directly 72
- DMT345, Accurate in hot 72
- OEM Applications 76
- Low maintenance 78
- Vaisala DRYCAP® 80
- Long calibration interval 80
- DSS70A portable 84
- Sampling cells for 84
- Transmitter Series for Oil 86
- Moisture in Oil 86
- The Vaisala HUMICAP 87
- Hand-Held 87
- MMT332 For High Pressure 88
- Installations 88
- MMT337 with Small Sized Probe 88
- Prevent it 91
- Transmitter for Oil 92
- Measurements 98
- Carbon Dioxide 98
- Interchangeable probes 100
- Technical data 101
- Demanding OEM Applications 102
- GMM111 Carbon Dioxide Module 104
- Vaisala CARBOCAP 106
- Two sampling methods 106
- Demand-controlled Ventilation 108
- Features/Benefi ts 110
- GMM112 Carbon Dioxide Module 112
- GMM20W Carbon Dioxide Module 114
- GML20 and GML20T 116
- Process Measurements 118
- Humidity and 121
- Measurement 121
- Environments 121
- Hazardous Areas 122
- Barometric Pressure 124
- PTU300 Models 125
- For more information, visit 128
- Reliable and accurate 129
- HVAC solutions 129
- Take the lab to the fi eld 132
- Standard PTB330TS 134
- PTB210 Digital Barometer 136
- Vaisala BAROCAP® 138
- Accuracy and stability 138
- Applications 138
- Ideal for outdoor 140
- Carefree maintenance 140
- Measuring acoustic 142
- Wind Measurement 146
- Vaisala Service O ering 148
- Vaisala Service Offering 148
- Accredited Body 149
- Accredited Parameters 149
- Vaisala Filters 150
- Vaisala Filters continued 151
- Vaisala Contact Information 153
- ACCURATE 154
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