Teledyne 3000TB, Operating Instructions Manual

Page: 87 / 107

Maintenance 3000TA- EU
Teledyne Analytical Instruments 72
5.3.4 Installing a New Micro-Fuel Cell
It is important to minimize the amount of time that a Teledyne
Trace Oxygen Sensor is exposed to air during the installation process.
The quicker the sensor can be installed into the unit, the faster your TAI
O
2
sensor will recover to low O
2
measurement levels.
CAUTION: DO NOT TOUCH THE SENSING SURFACE OF THE
CELL. IT IS COVERED WITH A DELICATE TEFLON
MEMBRANE THAT CAN LEAK WHEN PUNCTURED.
THE SENSOR MUST BE REPLACED IF THE
MEMBRANE IS DAMAGED.
Before installing a new cell, check the O-ring in the base of the cell
holder. Replace if worn or damaged.
Place the cell on the holder with the screen side facing down.
Note: There is a small location hole drilled in the holder. This
hole mates with a guide pin on the bottom rear of the cell
block. The hole in the cell block holder must align with the
guide pin on the cell block.
1. Remove power from instrument.
2. Remove the old sensor (if installed) from the analyzer.
3. Purge the analyzer at approximately 1 SCFH flow rate with
N
2
(or zero gas with the sensor holder removed).
4. Remove sensor from double bag storage.
5. Remove sensor shorting button.
6. Place sensor on sensor holder so that the gold contact plate of
the sensor is facing up towards the sky.
7. Install sensor and sensor holder into cell block.
8. With O-ring in place, align the guide pin with the hole on the
cell holder. Then, with the holder, lift cell into the cell block.
9. Push the gate on the cell block down so that the slots on the side
of the gate engage the locating screws on the side of the block.
This forces the holder into position and forms a gastight seal.
10. Purge system with sample or zero gas.
11. Power-up.
Note: If steps 4 through 10 are accomplished quickly (elapsed
time less than 15 seconds), recovery to less than 1ppm
level should occur in less than 8 hours.