Teledyne 3060e - Ultra Trace oxygen analyzer - Manual (Page 93)

Teledyne Electronic Technologies
Analytical Instruments
4-45
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8. The next screen prompts you to select
the auto settling slope for either zeroing
or spanning. To change the zero settling
slope, press
ZERO .
9. Now use the UP and DOWN keys to
scroll the slope value you want to set,
and press
ACCPT to enter this value into
the computer. (The system default for
the slope for zero settling is 0.005.)
NOTE: With the default zero slope of 0.005, a stable zero line can be
achieved for optimum accuracy at 1 ppb. However, if the accuracy
required is more than 5 ppb, a higher slope, such as 0.01 may be
selected. Figure 4-12 shows how changes in zero settling slope will
affect accuracy.
10. After pressing ACCPT in step 9, the next
screen brings you back to the auto-
settle parameter mode. To get to the
span settling slope menu, select
SLOPE .
11. Press SPAN to continue.
12. Use the UP and DOWN keys to scroll the
slope value you want to set, and press
ACCPT to enter this value into the
computer. (The system default for the
slope for span settling is 0.025.)
Note: With the default span settling slope of 0.025, a very stable span
curve is obtained within 20–40 minutes. However, by increasing
the span settling value, calibration may be achieved much quicker
(10–20 minutes) but will be less accurate. Figure 4-13 shows how
accuracy is affected by changing span settling slope values.
VALVES: ANALYZE C=9:59 T=25C
SELECT THE AUTO SETTLE SLO PE
FO R EITHER ZERO O R SPAN
1 2 3 4 5
SPAN ZERO ESC
VALVES: ANALYZE C=9:59 T=25C
SET THE SLO PE FO R ZERO SETTLE.
A SM ALLER SLOPE M EANS A LO NGER
SETTLE TIM E BUT M O RE ACCURATE
CALIBRATIO N
SLO PE = 0.005
1 2 3 4 5
ESC UP DOW N ACCPT
SLO PE PERO D
VALVES: ANALYZE C=9:59 T=25C
SELECT AUTO -SETTLE PARAM ETER
TO M O DIFY - PERIO D, SLO PE
OR AUTO CALIBRATOR OFFSET
1 2 3 4 5
O FFST ESC
VALVES: ANALYZE C=9:59 T=25C
SELECT THE AUTO SETTLE SLO PE
FO R EITHER ZERO O R SPAN
1 2 3 4 5
SPAN ZERO ESC
VALVES: ANALYZE C=9:59 T=25C
SET THE SLO PE FO R SPAN SETTLE.
A SM ALLER SLOPE M EANS A LO NGER
SETTLE TIM E BUT M O RE ACCURATE
CALIBRATIO N
SLO PE = 0.025
1 2 3 4 5
ESC UP DOW N ACCPT