Teledyne 3300ZB operating instructions Electronics, Effect of Pressure, General

Operational Theory Model 3300ZB

The sensor is designed for long term stability with an operating life of 5 years.

This unit features one or two sensors, and can be custom-designed for a specific range of oxygen analysis.

2.2.2 The Effect of Pressure

In order to state the amount of oxygen present in the sample as a specific portion of the gas mixture, it is necessary that the sample diffuse into the sensors under constant pressure.

If the total pressure increases, the rate that oxygen reaches the sensors will also increase. The electron transfer, and therefore the external current, will increase, even though the proportion of oxygen has not changed. It is therefore important that the sample pressure at the sensors, (usually vent pressure) remain relatively constant between calibrations.

2.3 Electronics

2.3.1 General

The signal processing uses a microcontroller with on-board RAM and ROM to control all signal processing, input/output, and display functions for the analyzer. System power is supplied from a universal power supply module designed to be compatible with most international power sources.

The power supply circuitry is on the Power Supply PCB, which is mounted vertically, just behind the rear panel of the control unit.

The signal processing electronics, which includes the signal amplifiers, microcontroller, analog to digital converter, and digital to analog converter, are located on the Main PCB. It is mounted vertically just behind the front panel of the control Unit.

Teledyne Analytical Instruments 6