Measures humidity, temperature, and barometric pressure in two accuracy classes. The PTU300 series features a large numerical and graphical display. Optional data logging and (W)LAN interface.

Barometric pressure, humidity and temperature measurement in one transmitter Available with two barometric pressure sensors - for added reliability RS-232C serial interface with NMEA protocol for GPS use Optional display, RS-485, analog output, and relay Optional power supply module NIST traceable calibration HMT330MIK Installation kit for outdoor use Applications include environmental monitoring in calibration laboratories, GPS meteorology: estimating precipitable water vapor in the atmosphere; weather stations Integrated data logging, with over four years of measured history LAN and WLAN communication options

Measurement range	500 ... 1100 hPa, 50 ... 1100 hPa
	Accuracy at +20 °C
	Class A 500 ... 1100 hPa	±0.10 hPa
	Class B 500 ... 1100 hPa	±0.20 hPa
	50 ... 1100 hPa	±0.30 hPa
	Total accuracy  (-40...+60 °C/-40...+140 °F)
	Class A 500 ... 1100 hPa	± 0.15 hPa
	Class B 500 ... 1100 hPa	± 0.25 hPa
	50 ... 1100 hPa	± 0.45 hPa
	Long-term stability
	Class A 500 ... 1100 hPa	± 0.1 hPa
	Class B 500 ... 1100 hPa	± 0.1 hPa
	50 ... 1100 hPa	± 0.2 hPa
	Sensor	Vaisala BAROCAP®
Relative humidity measurement
	Measurement range	0 ... 100 %RH
	Accuracy (including non-linearity and hysteresis)        at +15 … +25 °C	± 1 %RH (0 … 90%)± 1.7 %RH (90 … 100%)
	Sensor	Vaisala HUMICAP®180Vaisala HUMICAP® 180R
Temperature measurement
	Measurement range	-40 ... +60 °C (-40 ... +140 °F)
	Accuracy
	at -40 °C (-40 °F)	± 0.4 °C (±0.8 °F)
	at +20 °C (68 °F)	± 0.2 °C (±0.4 °F)
	at +60 °C (140 °F)	± 0.3 °C (±0.6 °F)
	Sensor	Pt100 RTD 1/3 Class B IEC 751
Operating environment
	Temperature range        with displayHumidity range	-40 ... +60 °C (-40 … +140 °F)0 ... +60 °C (+32 … +140 °F)non-condensing
Inputs and outputs
	Operating voltage
	with an optional power		10 ... 35 VDC
	supply module		100 … 240 VAC
	Analog outputs (optional)
	current outputs		0 … 20 mA, 4 … 20 mA
	voltage output		0 … 1 V, 0 … 5 V, 0 … 10 V
	Serial interface		RS-232C, RS-485
	Ethernet interface (optional)        Supported standards		10/100Base-T
	Connector		RJ45
	Protocols		Telnet
	WLAN interface (optional)
	Supported standards		802.11b
	Antenna connector type		RP-SMA
	Protocols		Telnet
	Security		WEP 64/128,WPA
	Authentication / Encryption
	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		max. three with trend/min/max values
	Logged parameters		10 sec (fixed)
	Logging interval		4 years 5 months
	Max. logging period		13,7 million points per
	Logged points		parameter
	Battery lifetime		min. 5 years
	Display		LCD with graphic trend display
Calculated quantities
	Humidity parameters	Dewpoint temperature (Tdp)Absolute humidity (a)Mixing ratio (x)Wet bulb temperature (Tw)Water vapour pressure (Pw)Entalphy (h)
	Pressure parameters	QNH PressureQFE PressureHeight corrected pressure HCPWMO Pressure tendency code