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Instruction Manual
245364-V
May 2002
ZERO Adjust
TEST Switch
CONTROL
Digital Display (LCD)
TEST Switch (S1)
Switch Position
1
2
3
4
ZERO Control (R13)
SPAN Control (R16)
3-2
Operation
6 Digit LCD Display
PRESS CAL1
NORM
Rosemount Analytical
Readout of sample oxygen content (0.00% to 100.00%) or selected test function,
depending on position of TEST switch.
Selects variable desired for readout on digital display.
Readout on Digital Display
Oxygen content of sample (0.00% to 100.00%)
Pressure/Voltage CAL 1
Pressure/Voltage CAL 2
Zero suppression applied to analog output circuit
(0.00 to 10.00 VDC)
Used to establish downscale calibration point on digital display or recorder chart.
With suitable downscale standard gas flowing through the analyzer, the ZERO
Control is adjusted for appropriate reading on display.
Used to establish upscale calibration point on digital display or recorder chart. With
suitable upscale standard gas flowing through the analyzer, the SPAN Control is
adjusted for appropriate reading on display or recorder.
Figure 3-1. Model 755A Front Panel Controls
ZERO
SPAN
PRESS CAL 2
REC OFFSET
M o d e l 7 5 5 A
O x y g e n A n a l y z e r
FUNCTION
Rosemount Analytical Inc.
A Division of Emerson Process Management
Model 755A
SPAN Adjust
Designation
NORM
CAL 1
CAL 2
ZERO SUPPRESSION
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