Teledyne BDS 3000, Operating Instructions Manual

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Operation BDS 3000
Teledyne Analytical Instruments
52
sufficiently close to zero before pressing ENTER to finish
zeroing .
Generally, you have a good zero when sl ope is less than 0.05 ppm/s
for about 30 seconds. When slope is close enough to zero, press ENT ER. In
a f ew seconds, the screen will update.
Once zero settling is completed, the information is stored in the
microprocessor, and the instrument automatically returns to the Analyze
mode.
4.4.2 Span Cal
The SPAN button on the front panel is used to span calibrate the
analyzer. Span calibration can be performed using the automatic mode,
where an internal algorithm compares consecutive readings from the
sensor to determine when the output matches the span gas concentration.
Span calibration can also be performed in manual mode, where the
operator determines when the span concentration reading is acceptable
and manually exits the function.
4.4.2.1 A
UTO
M
ODE
S
PANNING
Press SPAN to enter the span function. The screen that appears
allows you to select whether the span calibration is to be performed
automatically or manually. Use the
__
arrow keys to toggle between
AUTO
and
MAN
span settling. Stop when
AUTO
appears, blinking, on
the display.
Span: Settling: AUTO
<ENT>
For Next
Press ENTER to move to the next screen.
Calib. Holding time
Cal hold: 5 min
This menu allows the operator to set the time the analyzer should
be held in the
AUTO
span mode, after the readings of the analyzer settle.
Five minutes is the default, but it could be adjusted anywhere from 1 to
60 minutes by using the UP or DOWN keys.
Press ENTER to move to the next screen.
Span Val: 008.00 ppm
<ENT>Span <UP>Mod #