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Instruction Manual
245364-V
May 2002
3-2 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model 755A
TEST Switch
ZERO Adjust
Rosemount Analytical
Model 755A
Oxygen Analyzer
PRESS CAL1 PRESS CAL 2
NORM REC OFFSET
6 Digit LCD Display
SPAN Adjust
ZERO
SPAN
CONTROL
FUNCTION
Digital Display (LCD)
Readout of sample oxygen content (0.00% to 100.00%) or selected test function,
depending on position of TEST switch.
TEST Switch (S1) Selects variable desired for readout on digital display.
Switch Position Readout on Digital Display Designation
1 Oxygen content of sample (0.00% to 100.00%) NORM
2 Pressure/Voltage CAL 1 CAL 1
3 Pressure/Voltage CAL 2 CAL 2
4
Zero suppression applied to analog output circuit
(0.00 to 10.00 VDC)
ZERO SUPPRESSION
ZERO Control (R13)
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.
SPAN Control (R16)
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