Vaisala PTB220 Bedienungsanleitung PDF herunterladen (Seite 9)

CHAPTER 2___________________________________________________ PRODUCT DESCRIPTION

VAISALA __________________________________________________________________________ 3

CHAPTER 2 PRODUCT DESCRIPTION

Introduction

The PTB220 series barometers are fully compensated digital

barometers designed to cover a wide range of environmental pressure

and temperature. They can be used successfully both in accurate

pressure measurement applications at room temperature and in

demanding automatic weather station applications.

The PTB220 series digital barometers use the BAROCAP

silicon

capacitive absolute sensor developed by Vaisala for barometric

pressure measurement applications.

The measurement principle of the PTB220 series digital barometers is

based on an advanced RC oscillator and three reference capacitors

against which the capacitive pressure sensor and the capacitive

temperature compensation sensor are continuously measured. The

microprocessor of the barometer performs compensation for pressure

linearity and temperature dependence.

The pressure and temperature adjustment in the PTB220 consists of

seven temperature levels over the operating temperature range of the

barometer and of six to eleven pressure levels over the operating

pressure range of the barometer at each temperature level. The

calculated individual basic pressure and temperature adjustment

coefficients are stored in the EEPROM of each pressure transducer.

The user cannot change these basic factory adjustments.

The multipoint fine adjustment for pressure and the final pressure

calibration of the PTB220 Class A barometers is done using a manual

Ruska 2465 dead-weight tester. The multipoint fine adjustment and

calibration of the Class B barometers is done automatically using

electronic working standards.

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Vaisala PTB220 Bedienungsanleitung Seite 9