Teledyne 9700 instruction manual Operational Calibration

4 Operation Model 9700

4.1.5Operational Calibration

After the equilibration period following the installation of any new cell, or whenever it is desirable to recheck the calibration of the instru- ment, use the following calibration procedure:

(1)Place the RANGE selector switch on the 0+25% Position.

(2)Rotate the selector valve so that calibration (or span) air is flowing.Allow air to flow for 3 to 5 minutes.

(3)Unlock and adjust the SPAN control until the meter pointer is in precise coincidence with the scale CAL mark (use the mirror to eliminate parallax) and relock the SPAN control.

(4)Return the instrument to service by restoring sample flow and selecting the range that provides the best possible resolution of the sample oxygen .

(5)To prevent generating ambiguous alarms during calibration of alarm equipped instruments, simply unlock and rotate the setpoint dial (or dials) until the limits of travel in the NORMAL (rather than ALARM) direction have been attained. After sample flow has been reestablished and the proper scale of analysis selected, the alarm point can be precisely reset by simplre-dialing the setpoint.

(6)For converter-equipped instruments, the current output of the converter always tracks the output of the measuring circuit amplifier. No provision for interlocking the converter to a particular range of analysis has been provided. If the current output is being used to operate a pneumatic control device, the customer will be required to provide whatever necessary electrical or mechanical interlocks necessary to safeguard his system against the signal changes that will occur during calibration.

4-4 TELEDYNE BROWN ENGINEERING

Analytical Instruments