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Vaisala HMT337 Humidity and Temperature

Humidity and Temperature
HMT337

The Vaisala HUMICAP® Humidity and Temperature Transmitter HMT337 is delivered in one of three configurations:
• Basic: non-warmed probe for moderate humidities
• With a warmed probe: for nea-rcondensing conditions and dew point measurement
• With a warmed probe and an additional temperature sensor: for near-condensing conditions and relative humidity measurement.

True humidity readings in conditions of condensation
The Vaisala unique warmed probe provides fast and reliable measurement in environments where humidity is near saturation. The warming prevents condensation from forming on the sensor.

As the probe is warmed, the humidity level inside it stays below the ambient level. With accurate temperature measurement, the ambient dewpoint can be calculated precisely. If the relative humidity value is needed, an additional temperature sensor is used. The measured ambient temperature provides he compensation for calculating relative humidity and other humidity parameters.

Many ways to install
A tight installation through a process wall can be achieved with Swagelok® fittings. Meteorological installation kits for outdoor installations and duct installation kits are also available.

• For high-humidity applications in industry and meteorology
• Warmed probe for superior performance in condensing environments
• Small, stainless steel, vapor-tight remote probe
• For temperatures -70 ... +180 °C (-94 ... +356 °F)

Relative humidity
Measurement range 0 ... 100 % RH
Accuracy (including non-linearity, hysteresis, and repeatability) with Vaisala HUMICAP® 180 or 180R for typical applications
with Vaisala HUMICAP® 180C or 180RC for applications with chemical purge/warmed probe
at +15 ... +25 °C (59 ... +77 °F) ±1 %RH (0 ... 90 %)
±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 (+20 °C) ± 0.6 % RH (0 ... 40 %RH)
± 1.0 % RH (40 ... 97 %RH)
Response time (90 %) at +20 °C (+68 °F) 8 s / 17 s* with grid filter
in still air 20 s / 50 s* with grid + steel netting filter
40 s / 60 s* with sintered filter
Temperature
Accuracy at +20 °C (+68 °F) ± 0.2 °C (± 0.36 °F)
Inputs and outputs
Operating voltage 10 ... 35 VDC, 24 VAC
with optional power supply module 100 ... 240 VAC, 50/60 HZ
Power consumption at +20 °C (Uin 24 VDC) RS-232 max. 25 mA
Uout 2 x 0 ... 1 V/0 ... 5 V/0 ... 10 max. 25 mA
Iout 2 x 0 ... 20 mA max. 60 mA
display and backlight + 20 mA
during chemical purge max. 110 mA
during probe heating (HMT337) + 120 mA
Analog outputs (2 standard, 3rd optional) current output 0 ... 20 mA, 4 ... 20 mA
voltage output 0... 1 V, 0... 5 V, 0... 10 V
Accuracy of analog outputs at +20 °C ±0.05% full scale
Temperature dependence of the
analog outputs
±0.005%/°C full scale
External loads current outputs RL < 500 ohm
0 ... 1 V output RL > 2 kohm
0 ... 5 V and 0 ... 10 V outputs RL > 10 kohm
Max. wire size 0.5 mm2 (AWG 20) stranded wires recommended
Digital outputs RS-232, RS-485 (optional)
Service connection RS-232, USB
Relay outputs (optional) 0.5 A, 250 VAC
Ethernet interface (optional) Supported standards 10/100Base-T
Connector RJ45
Protocols Telnet
Software support Vaisala MI70 link
Ethernet interface (optional) Supported standards 802.11b
Connector Type RP-SMA
Protocols Telnet
Security WEP 64/128,WPA
Software support Vaisala MI70 link
Authentication / Encryption (WLAN) Open / no encryption
Open / WEP
WPA Pre shared key / TKIP
WPA Pre shared key / CCMP (a.k.a. WPA2)
Optional data logger with real-time clock Logged parameters max. three with trend/min/max values
Logging interval 10 sec (fixed)
Max. logging period 4 years 5 months
Logged points 13.7 million points per parameter
Battery lifetime min. 5 years
Display LCD with backlight, graphic trend display of any parameter
Menu languages English, Chinese, Japanese, Spanish, German, French, Swedish, Russian, Finnish


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