PTU300 Combined Pressure, Humidity and Temperature Transmitter

For demanding applications

Model: PTU300
Manufacturer: Vaisala – Finland

Features

  • Barometric pressure, humidity, and temperature measurement in one transmitter
  • RS-232C serial interface with NMEA protocol for GPS use
  • Graphical display and keypad for convenient operation
  • Analog outputs, RS-232/485
  • Modbus RTU protocol support
  • Traceable to international standards
Category:

Vaisala Combined Pressure, Humidity and Temperature Transmitter PTU300 is a unique instrument measuring three parameters simultaneously.

Options

  • Available with up to two barometric pressure sensors for added reliability
  • Optional universal power supply module
  • HMT330MIK installation kit for outdoor use

You can choose from the following probe options: PTU301 for wall mounting for example in laboratories or engine rooms, PTU303 for general use, PTU307 warmed probe for outdoor and demanding meteorology applications, and PTU30T for pressure and temperature measurement only.

Proven Vaisala sensor technology

PTU300 incorporates sensors known for their high accuracy and excellent longterm stability: Vaisala BAROCAPâ for pressure measurement and Vaisala HUMICAP for humidity measurement. The temperature sensor is a platinum RTD sensor.

Graphical display of measurement data and trends for convenient operation PTU300 features a large numerical and graphical display with a multilingual menu and keypad. It allows users to easily monitor operational data, measurement trends, and access measurement history for the past 12 months.

The optional data logger, with real-time clock, makes it possible to generate over four years of measurement history and zoom in on any desired time or time frame.

The display alarm allows any measured parameter to be tracked, with freely configurable low and high limits.

Versatile outputs and data collection

PTU300 comes with a standard RS-232 serial interface. The output format is compatible with major GPS receivers and NMEA-coded messages. An isolated RS-485 interface is available as an option.

PTU300 is also capable of applying the Modbus communication protocol, providing Modbus RTU (RS-485) communication.

The data logger records data that can be viewed on the local display or transferred to a PC with Microsoft Windows software. A USB service cable makes it easy to connect PTU300 to a PC via the service port.

Outdoor installation kit

Outdoor installation is possible using the optional HMT330MIK installation kit, for applications requiring reliable measurements for meteorological purposes.

Flexible calibration

Quick, one-point field calibration for humidity is easy using Vaisala Hand-Held Humidity Meter HM70. With Vaisala Barometric Pressure Transfer Standard PTB330TS, including

optional humidity and temperature probe, field check and calibration can be performed for all three parameters.

Applications

  • Environmental monitoring in calibration laboratories
  • Industrial applications in semiconductor industry, engine testing and maritime sector
  • GPS meteorology: estimating precipitable water vapor in the atmosphere, weather stations

Measurement performance

 

Barometric pressure
Pressure range 500 … 1100 hPa 50 … 1100 hPa
Accuracy 500 … 1100 hPa 500 … 1100 hPa 50 … 1100 hPa 
Class A  Class B
Linearity ±0.05 hPa ±0.10 hPa ±0.20 hPa
Hysteresis ±0.03 hPa ±0.03 hPa  ±0.08 hPa
Repeatability ±0.03 hPa ±0.03 hPa ±0.08 hPa
Calibration unceratinty ±0.07 hPa ±0.15 hPa ±0.20 hPa
Accuracy at +20 °C / +68 °F ±0.10 hPa ±0.20 hPa ±0.30 hPa
Temperature dependence ±0.1 hPa ±0.1 hPa ±0.3 hPa
Total accuracy (-40 … +60 °C / -40 … +140 °F) ±0.15 hPa ±0.25 hPa ±0.45 hPa
Long-term stability/year ±0.1 hPa ±0.1 hPa ±o.2 hPa
Response time (100 % response):
One sensor 2 s 1s 1s
Pressure units hPa, mbar, kPa, Pa, inHg, mmH20, mmHg, torr, psia
Relative humidity
Measurement range 0 … 100 %RH
Accuracy (Including non-linearity, hysteresis, and repeatability):
At +15 … +25 °C / +59 … +77 °F 

At -20 … +40 °C / – 4… +104 °F 

At -40 … +60 °C / -40 … +140 °F

±1 %RH (0 … 90 %RH) 

±1.7 %RH (90 … 100 %RH)

 ±(1.0 + 0.008 x reading) %RH 

±(1.5 + 0.015 x reading) %RH

Factory calibration uncertainty (+20 °C / +68 °F) 

(Defined as ±2 standard deviation limits. Small variations possible, see also calibration certificate.)

±0.6 %RH (0 … 40 %RH) 

±1.0 %RH (40 … 97 %RH)

Sensor for typical applications  Vaisala HUMICAP 180 or 180R
Sensor for applications with chemical purge/warmed probe Vaisala HUMICAP 180C or 180RC
Response Time (90 %) at +20 °C (+68 °F) in Still Air: 
With grid filter 

With grid + steel netting filter 

With sintered filter

8 s / 17 s 1) 

20 s / 50 s 1)

40 s / 60 s 1)

Temperature
Measurement range, housing (barometric pressure measurement limit) 2 -40 … +60 °C (-40 … +140 °F)
Measurement range, probes (operational limit when measuring RH or T) PTU301: -40 … +60 °C (-40 … +140 °F) 

PTU303: -40 … +80 °C (-40 … +176 °F) 

PTU307: -40 … +180 °C (-40 … +356 °F) 

PTU30T: -70 … +180 °C (-94 … +356 °F) 3)

Accuracy at +20 °C (+68 °F)  PTU301, PTU303, PTU307: ±0.2 °C (±0.4 °F) 

PTU30/T: ±0.1 °C (±0.18 °F)

Temperature units °C, °F
Temperature sensor Pt100 RTD Class F0.1 IEC 60751 

 

1) With HUMICAP 180R or 180RC sensor 

2) Note that the operational temperature limits of the PTU303, PTU307, and PTU30T probes are higher than for the PTU300 transmitter itself. The transmitter’s temperature limit is based on the upper temperature limit for barometric pressure measurement, +60 °C (+140 °F) 

3) PTU30T is used for T and P measurements only, RH measurement not in use. 

 

Display

 

Material  LCD with backlight, graphical trend display of any parameter
Menu languages English, Chinese, Finnish, French, German, Japanese, Russian, Spanish, Swedish

 

Inputs and outputs

 

Operating voltage 

With optional power supply module

10 … 35 V DC, 24 V AC ±20 %

100 … 240 V AC, 50/60 Hz

Settling time at power-up (one sensor) Class A: 4 s 

Class B: 3 s

Wire size 0.5 … 2.5 mm2 (AWG 20 … 14) 

Stranded wires recommended

Digital outputs RS-232, RS-485 (optional)
Protocols ASCII commands, Modbus RTU
Service connection RS-232, USB
Relay outputs (optional) 0.5 A, 250 VAC
Power consumption at +20 °C (+68 °F) (Uin 24 VDC): 
RS-232 Max. 28 mA
Uout 3 x 0 … 1 V / 0 … 5 V / 0 … 10 V Max. 33 mA
Iout 3 x 0 … 20 mA Max. 63 mA
Display and backlight +20 mA
During chemical purge Max. +110 mA
During probe heating +120 mA
External Loads
Current outputs RL < 500 Ω
0 … 1 V output RL > 2 kΩ
0 … 5 V and 0 … 10 V outputs RL > 10 kΩ
Analog outputs (optional) 
Current output 0 … 20 mA, 4 … 20 mA
Voltage output 0 … 1 V, 0 … 5 V, 0 … 10 V
Humidity and temperature:
Accuracy of analog outputs at +20 °C (+68 °F) ±0.05 °% full scale
Temperature dependence of analog outputs ±0.005 %/°C (0.003 %/°F) full scale
Pressure: 
Accuracy of analog outputs at +20 °C (+68 °F) ±0.30 hPa (500 … 1100 hPa) 

±0.40 hPa (50 … 1100 hPa)

Accuracy of analog outputs at -40 … +60 °C / -40 … +140 °F ±0.60 hPa (500 … 1100 hPa) 

±0.75 hPa (50 … 1100 hPa)

 

Operating environment

 

Operating temperature -40 … +60 °C (-40 … +140 °F)
Operating temperature with optional display 0 … +60 °C (+32 … +140 °F)
Humidity range Non-condensing
Measurement environment For air, nitrogen, hydrogen, argon, helium, and oxygen 1)

 

1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases

 

Compliance

 

Compliance marks CE, RCM
EMC compliance EN61326-1, Industrial Environment
Note: For transmitter with display, a test impedance of 40 Ω is used in IEC61000-4-5 (Surge immunity). 

 

Mechanical specifications

 

Cable bushing M20 x 1.5 for cable diameter 

8 … 11 mm / 0.31 … 0.43″

Conduit fitting 1/2″ NPT 
User cable connector (optional) 

Option 1 

Option 2

M12 series 8-pin (male) 

Female plug with 5 m (16.4 ft) black cable 

Female plug with screw terminals

Cable diameter, PTU303 6.0 mm
Cable diameter, other probes 5.5 mm
Standard probe cable lengths 2 m, 5m or 10 m 1)
Housing materia G-AlSi 10 Mg (DIN 1725)
IP rating IP66 

IP65 with local display

Weight (depending on selected probe) 1.0 – 3.0 kg / 2.2 – 6.6 lb

 

1) Additional cable lengths available, please see order form for details.

 

Optional data logger with real-time clock 

 

Logged parameters Max. four with trend/min/max values
Logging interval 10 s (fixed)
Maximum logging period with maximum temporal resolution 4 years 5 months
Logged points 13.7 million points per parameter
Battery lifetime Min. 5 years

 

Spare parts and accessories

 

PC software and cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70  211339
Wall mounting plate (plastic) 214829
Pole installation kit with rain shield 215109
DIN rail installation set 211477
Duct installation kit, PTU303/307 210697
Cable gland and AGRO, PTU303/307 HMP247CG
Solar radiation shield, PTU303/307/30T DTR02B
Meteorological installation kit  HMT330MIK
Duct installation kit (T probe) 215003

PTU300 Combined Pressure, Humidity and Temperature Transmitter Datasheet

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