Manual Mode Spanning; The Alarms Function - Teledyne 3000PB Operating Instructions Manual

Percent oxygen analyzer

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Table Of Contents

Table of Contents

4 Operation

4.4.2.2

Press Span to start the Span function. The screen that appears allows

you to select whether the span calibration is to be performed automatically or

manually.

Use the Δ∇ keys to toggle between AUTO and MAN span settling.

Stop when MAN appears, blinking, on the display. Press Enter to move to

the next screen.

Press Δ (<UP>) to permit modification (Mod #) of span value.

Use the arrow keys to enter the oxygen concentration of the span gas

you are using (20.90 if you are using air). The < > arrows chose the digit,

and the Δ∇ arrows choose the value of the digit.

Press Enter to enter the span value into the system and begin the span

calibration.

Once the span has begun, the microprocessor samples the output at a

predetermined rate. It calculates the difference between successive samplings

and displays this difference as Slope on the screen. It takes several seconds

for the first Slope value to display. Slope indicates rate of change of the

Span reading. It is a sensitive indicator of stability.

When the Span value displayed on the screen is sufficiently stable,

press Enter. (Generally, when the Span reading changes by 1 % or less of

the full scale of the range being calibrated for a period of five minutes it is

sufficiently stable.) Once Enter is pressed, the Span reading changes to the

correct value. The instrument then automatically enters the Analyze func-

tion.

4.5

The Alarms Function

The Model 3000PB is equipped with 2 fully adjustable concentration

alarms and a system failure alarm. Each alarm has a relay with a set of form

"C" contacts rated for 3 amperes resistive load at 250 V ac. See Figure in

Chapter 3, Installation and/or the Interconnection Diagram included at the

back of this manual for relay terminal connections.

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