Teledyne TED 191 SECTION FIVE ROUTINE MAINTENANCE

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

SECTION FIVE ROUTINE MAINTENANCE

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.

From time to time the 4 x AA (penlight) dry cell batteries that power the instr ument 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 possib le, 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 batter ies 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 us ing the instrument.

From time-to-time the oxygen sensor cell, being a consumptive electro-c hemical device, will

require replacement. This requirement will be indicated via an ina bility to achieve calibration

i.e the range provided by the Calibration Control Knob will not be suff icient 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 t o 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 rep lacement sensor should

be entered into this log at the time of changing.