SECTION FIVE

ROUTINE MAINTENANCE

5.1ROUTINE VISUAL INSPECTION

Always inspect the instrument prior to use for obvious damage or for parts or components missing. Make a point of checking the oxygen sensor cell for signs of electrolyte leakage, water condensation on the sensing surface. Also check the integrity of the cable and all cable connections.

5.2CHANGING BATTERIES

From time to time the 4 x AA (penlight) dry cell batteries that power the instrument will require replacement. This requirement will be indicated via a "LO BAT" alarm message located in the top left hand corner of the LCD display. It is also possible, if the instrument has not been used for sometime, that the batteries will be depleted to the extent that the instrument will not power up when switched on. In both instances, the batteries must be replaced.

To change the batteries, follow the procedures set out in 1.2 above.

Initiate a calibration once the new batteries are installed prior to using the instrument.

5.3CHANGING THE OXYGEN SENSOR CELL

From time-to-time the oxygen sensor cell, being a consumptive electro-chemical device, will require replacement. This requirement will be indicated via an inability to achieve calibration i.e the range provided by the Calibration Control Knob will not be sufficient to achieve the setting of 100% on the LCD display when exposing the sensor tip to 100% pure oxygen.

To change the oxygen sensor, follow the procedures set out in 1.3 above.

Initiate a calibration once the new sensor has been installed prior to using the instrument.

A Sensor Cell Replacement Log has been provided for the reference of the users, and is located at the back of this Instruction Manual. The details of the replacement sensor should be entered into this log at the time of changing.

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

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Teledyne TED 191 Section Five, Routine Visual Inspection, Changing Batteries, Changing the Oxygen Sensor Cell

TED 191 specifications

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