Vaisala PTB220 Manual de usuario descargar pdf (Pagina 10)

USER'S GUIDE_______________________________________________________________________

4 ____________________________________________________________________ M210194EN-A

The PTB220 series digital barometers are available with one, two or

three pressure transducers. Although one pressure transducer is

usually the most appropriate configuration, some applications may

benefit from additional pressure transducers. Two or three pressure

transducers provide for a self-diagnostic feature: the user can set an

alarm limit within which the pressure transducers must agree for

reliable measurement. The PTB220 series barometers can also be

configured to measure two separate pressures.

A local LCD display on the cover is also available as a configuration

option. The display has a backlight, which makes the display easy to

read at any light conditions. The display has two rows and it can

simultaneously indicate the barometric pressure, the three-hour

pressure trend and the WMO pressure tendency code.

The user can define various specific application settings, such as serial

bus settings, averaging time, output interval, output format, display

format, error message field, pressure unit and pressure resolution. It is

also possible to select different sending modes for power-up situation

such as the free running mode, the stand-by mode and a mode with

one automatically sent message. A fast measurement mode with ten

measurements per second can also be selected. The factory settings

have been chosen so that both a fast settling time and a high resolution

are achieved. In applications where fast settling time is not required,

longer averaging times are recommended to reduce environmetal

pressure noise.

As a standard, there are RS 232C full duplex and bidirectional TTL

level serial interface in the barometer. In addition the user can select

either an RS 485/422 two-wire half duplex serial interface or a pulse

output interface with user selectable pulse rate, pressure resolution and

pressure offset.

The PTB220 series digital barometers are traceable to National

Institute of Standards and Technology (NIST) in the USA.

BAROCAP

pressure sensor

The PTB220 digital barometers use the BAROCAP

silicon

capacitive absolute pressure sensor developed by Vaisala for

barometric pressure measurement applications. The BAROCAP

sensor has excellent hysteresis and repeatability characteristics, low

temperature dependence and a very good long-term stability. The

ruggedness of the BAROCAP

sensor is outstanding and the sensor is

resistant to mechanical and thermal shocks.

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