Teledyne Carbon Monoxide Analyzer 300 User Manual download pdf (Page 83)

9.0 ADJUSTMENTS

NOTE

THE OPERATIONS OUTLINED IN THIS CHAPTER ARE TO BE

PERFORMED BY QUALIFIED MAINTENANCE PERSONNEL

ONLY!

All adjustments to the Model 300 are easy to make. Pots and test points are readily

accessible without removing any components.

Figure 1.6 is a plan view of the Model 300 CO Analyzer showing all the major

components.

Figure 9.1 is an electrical diagram of Model 300 CO Analyzer.

9.1 Power supply board adjustment

The power supply board provides +/-15v +12v and +5v DC power to the Analyzer. Four

temperature linearization circuits, for the Analyzer main lamp, Sample temp, Box temp,

and IZS carbon monoxide generator are also located on the power supply board.

Each circuit is a whetstone bridge with the measuring thermistor being one leg. A

feedback circuit performs the required linearization. Zero adjust pots have been factory

set and no field adjustment should be required.

9.1.1 Box temperature limits

The box temperature is measured by a thermistor located on the motherboard. The box

temp is not controlled in the Model 300. The temperature is measured and displayed as a

TEST function on the front panel (see Section 5.1). The alarm limits can be set via an

RS-232 port command.

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Teledyne Carbon Monoxide Analyzer 300 User Manual Page 83