Broadley Technologies 14 Manuál s instrukcemi stáhnout pdf (Strana 8)

Model 14 Oxygen Analyzer

Chapter2:

Description of the Analyzer

2.1 Transmitter

2.1.1 Presentation of the Transmitter

2-1

The electronic unit amplifies the signal of the amperometric measuring cell and converts it into a direct digital

readout in ppm, mg/l or % saturation. The transmitter is comprised of the following items:

■ Potentiostat which maintains the working electrode potential constant

■ Amperometric measuring module

■ Analog multiplexer

■ Microprocessor unit

The analog multiplexer allows measurement inputs from the measuring cell, temperature sensor and internal

checkpoints. Furthermore, the microprocessor operates the relays, the RS485 interface (optional) and the ana-

log outputs.

The unit has an internal concentration auto-ranging feature and a microprocessor-operated calibration routine.

The output of the potentiostat is monitored for possible overdriving of the potentiostat-output stage. This condi-

tion can occur when the connections to the measuring cell are due to an inoperable electrode or a defective ref-

erence electrode.

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Broadley Technologies 14 Manuál s instrukcemi Strana 8