Teledyne 320 Series - Portable oxygen detectors - Manual (Page 8)

Teledyne Analytical Instruments
2-2
Model 320 Series Chapter 2
2.3 2.3 2.3 2.3 2.3 Calibration Calibration Calibration Calibration Calibration
1. Remove the flow-through adapter, and place the range switch in the
0-25% range. On the standard 320P, this is the HI position of the
Range switch.
2. Rotate the Span control until the meter indication pointer coincides
with the red mark extending into the scale of the meter.
3. Repeat this procedure after the cell has been in the instrument at
least 24 hours.
4. After initial calibration, check the span setting before each use.
NOTE: The calibration mark on the 0-25 % range of the detector meter
coincides with the normal oxygen concentration of the atmo-
sphere. Therefore, calibration using this mark as a standard
should not be undertaken in any area where the oxygen content
of the atmosphere surrounding the probe assembly is being
controlled.
2.4 2.4 2.4 2.4 2.4 Micro-Fuel Cell Micro-Fuel Cell Micro-Fuel Cell Micro-Fuel Cell Micro-Fuel Cell
2.4.1 2.4.1 2.4.1 2.4.1 2.4.1 Cell Replacement Cell Replacement Cell Replacement Cell Replacement Cell Replacement
When the detector cell nears the end of its useful life, meter readings will
become erratic. Shortly thereafter, the cell output will drop off sharply to
zero. Replace the cell at this point.
NOTE: A spare cell should be ordered soon after receipt of the detector,
and each time the cell is replaced thereafter.
2.4.2 2.4.2 2.4.2 2.4.2 2.4.2 Cell Life and Warranty Cell Life and Warranty Cell Life and Warranty Cell Life and Warranty Cell Life and Warranty
The MFC carries a warranty that covers its normal life expectancy. How-
ever, far greater life expectancy can be achieved with the cell-saver feature
already discussed. See the specifications section below for warranty,
response time and electrical output of the various cells.
Customers having warranty claims must return the cell in question immedi-
ately to the factory for evaluation. If it is determined that failure is due to
faulty workmanship or parts, the cell will be replaced at no cost to the
customer. Any evidence of tampering, or damage through mishandling, will
render the cell warranty null and void.
If a cell was working satisfactorily, but ceases to function before the war-
ranty period expires, the customer will receive credit, on a prorated basis,
towards the purchase of a new cell.