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Vaisala HMT333 Humidity and Temperature Transmitter

Humidity and Temperature Transmitter
HMT333

The Vaisala HUMICAP® Humidity and Temperature Transmitter HMT333 is a versatile instrument for applications where a small remote probe is needed.

Flexible installation
To install the probe in ducts, channels and through walls, an installation kit is available with an aluminum flange, lead-through piece, and steel support bar.

HMT333 has two probe cable options available, a flexible one that withstands heat up to +80° C, and a durable cable that withstands heat up to +120° C. Both cable options areavailable in lengths of 2, 5, and 10 meters.

For moderate humidities and temperatures
The HMT333 is typically used in demanding HVAC applications such as clean rooms, pharmaceutical processes, and greenhouses, or in processes of moderate temperature.

For environments with continuously high humidity, the HMT337 with a warmed, vapor-tight and stainless steel probe is recommended.

▪ For remote probe installations in demanding HVAC applications
▪ For temperatures -40 ... +80 °C (-40 ... +176 °F) or -40 ... +120 °C (-40 ... +248 °F)
▪ Small thermal mass - fast response to temperature changes
▪ Application examples: clean rooms, pharmaceutical processes, greenhouses, environmental chambers

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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