Vaisala PTU300 Betriebsanweisung Seite 20

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USER'S GUIDE____________________________________________________________________
18 __________________________________________________________________ M210796EN-E
- Different probe mounting kits, sensor protection options and probe
cable lengths
- Transmitter mounting kits for multiple installation purposes
- Chemical purge for applications where interfering chemicals in the
measuring environment pose a risk
- Warmed probe and sensor heating for high humidity conditions
(PTU307)
- Optional temperature sensor for PTU307
- Optional modules: isolated power supply, power supply module, RS-
422/485-module, LAN interface module, WLAN interface module,
data logger module, additional analog output module,
and relay module
New and improved features compared to PTU200
- Improved %RH accuracy
- Graphical display (trend of any parameter)
- Analog outputs (voltage and current)
- Service port for MI70 or PC
- USB connectivity for service connections via the optional
USB-RJ45 cable
- Isolated RS485 module (using single barometer module)
- Relay module (using single barometer module)
- LAN and WLAN interfaces (using single barometer module)
- Data logger module with real time clock (using single barometer
module)
Pressure Measurement
The PTU300 series transmitters use a BAROCAP
®
silicon capacitive
absolute sensor developed by Vaisala for barometric pressure
measurement applications. The measurement principle of the PTU300
series digital transmitters is based on an advanced RC oscillator and three
reference capacitors against which the capacitive pressure sensor and
capacitive temperature compensation sensor are continuosly measured.
The microprocessor of the transmitter performs compensation for
pressure linearity and temperature dependence.
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