Teledyne 3060e - Ultra Trace oxygen analyzer User Manual

Page 41

Teledyne Electronic Technologies

Analytical Instruments

3-15

Installation

Ultra

Ultra T

Trace Oxyg

race Oxyg

race Oxygen Anal

en Anal

en Analyz

yzer

The water in the reservoir should last for 8-12 months. Check the water level
periodically by dipping a glass rod into the reservoir. When the water level falls
below

inch, add more water until the level is approximately

inch below

the top surface of the reservoir.

CAUTION:

Do not completely fill the reservoir with water; this will
prevent the sensor sparge gas from being vented through the
water reservoir and may force the sparge gas to flow through
the sensing electrode of the sensor and cause electrolyte
leakage.

If the analyzer is to be used as a transportable unit, i.e., on a cart for certifying
various points at an installation, do not add water into reservoir but instead add
prepurged water directly into the sensor when the electrolyte level has fallen
below the yellow level marker on the sensor.

Level Detector and Solenoid Switch

The level detector senses when the electrolyte level in the sensor drops, usually
as a result of water evaporation. When this occurs, a solenoid valve (valve 9
on the Status Panel) opens and replenishes the lost water at a rate depending
on the relative opening of metering valve MV3.

Ocassionally, trapped air between the solenoid valve (valve 9) and the metering
valve (MV3) will prevent the automatic addition of water to the sensor even
though the level detector is sensing a low electrolyte condition and the solenoid
valve is open. In some units, a toggle switch has been installed as shown in
Figure 3-6 which when switched off and on several times, causes the solenoid
valve (valve 9) to open and close repeatedly and dislodges any trapped gas. In
units without this toggle switch, repeated opening and closing of the solenoid
valve is accomplished through the software.

For the units with the toggle switch, the switch should be left in the ON position
for normal operation. Moving the toggle switch to the OFF position causes the
solenoid valve to close. If trapped gas is suspected, alternately opening and
closing the solenoid valve by switching the toggle switch off and on several
times will create a slight pressure pulse and drive out any trapped pockets of
air.

NOTE: The toggle switch must be left in the ON position for normal

operation. If the switch is left in the OFF position, the water
replenishing solenoid valve (valve 9) will remain closed regardless
of the electrolyte level in the sensor. Opening MV3 will have no
effect on the electrolyte level. Instability and damage to the Ultra
Trace sensor will eventually result as the electrodes become dry.