S
TARTUP
3-5
748183-H
Rosemount Analytical
November 1997
gas.
b. Pass upscale standard gas through analyzer at same flow rate as was used
for downscale standard gas. Allow gas to purge analyzer for minimum of three
minutes.
c.
Adjust SPAN Control so that reading on meter or recorder is appropriate to the
upscale standard gas. (The required reading may be the actual oxygen
content of the upscale standard gas, or may be an adjusted value, depending
on the relative magnetic susceptibilities involved, and the range and span
used, see Section 3.2.2.) If proper reading is unobtainable by adjustment of
the SPAN Control, refer to Section 7, Service and Maintenance.
3.2.2 A
LTERNATIVE
C
ALIBRATION
P
ROCEDURE
U
SING
U
PSCALE
S
TANDARD
G
AS
O
NLY
The following calibration procedure, using an upscale standard gas only, is an
alternative to the calibration procedure described in Section 3.2.1, which requires both
a downscale and an upscale standard gas.
Throughout the procedure it is preferable to use recorder readout for all oxygen
readings.
If a recorder is not available, use the front-panel meter.
1. Set % RANGE Switch for range of highest sensitivity, i.e., most narrow span.
2. Set ZERO and SPAN Controls at mid-range.
3. Pass upscale standard gas through analyzer at suitable flow rate, preferably 250
cc/min. Allow gas to purge analyzer for minimum of three minutes.
4. With % RANGE Switch set for most-sensitive range, obtain reading equal to the
oxygen content of the upscale standard gas by adjustment of the appropriate
control:
a. If the most-sensitive range is zero-suppressed, obtain the correct reading by
adjustment of internal Zero Suppression Potentiometer R45, see Figure 3-1.
b.
If the most-sensitive range is zero-based, or if a stable reading is unobtainable
by adjustment of R45, obtain correct reading by adjustment of ZERO control.
5. Set % RANGE Switch for least-sensitive range, i.e., widest span. Then adjust
SPAN Control to obtain reading equal to the oxygen concentration of the upscale
standard gas. Return % RANGE Switch to most-sensitive range.
6. Repeat Steps 4b and 5 as many times as necessary until no readjustment is
required after switch-over from one range to the other.
7. To verify accurate calibration, admit an on-scale gas other than the upscale
standard. and check that the indicated oxygen concentration is correct.
Содержание 755
Страница 1: ...Rosemount Analytical MODEL 755 OXYGEN ANALYZER INSTRUCTION MANUAL 748183 H ...
Страница 16: ...MODEL 755 OXYGEN ANALYZER Rosemount Analytical 748183 H November 1997 P 8 NOTES ...
Страница 22: ...MODEL 755 OXYGEN ANALYZER 1 6 748183 H Rosemount Analytical November 1997 NOTES ...
Страница 40: ...MODEL 755 OXYGEN ANALYZER 2 18 748183 H Rosemount Analytical November 1997 NOTES ...
Страница 50: ...MODEL 755 OXYGEN ANALYZER 3 10 748183 H Rosemount Analytical November 1997 NOTES ...
Страница 62: ...MODEL 755 OXYGEN ANALYZER 5 10 748183 H Rosemount Analytical December 1997 NOTES ...
Страница 90: ... blank ...
Страница 92: ... blank ...
Страница 94: ... blank ...