Emerson 755A Manual De Usuario

245364-V
May 2002

iv        Contents                                                                                    Rosemount Analytical Inc.    A Division of Emerson Process Management

Model 755A

Figure 1-1.

Model 755A Oxygen Analyzer ............................................................................... 1-1

Figure 1-2.

Model 755A Component and Adjustment Locations ............................................. 1-3

Figure 2-1.

Electrical Connections ........................................................................................... 2-2

Figure 2-2.

Control Board......................................................................................................... 2-3

Figure 2-3.

Connections for Potentiometric Recorder with Non-Standard Span ..................... 2-3

Figure 2-4.

Model 755A Connected to Drive Several Current-Activated Output Devices ....... 2-4

Figure 2-5.

Typical Alarm Settings ........................................................................................... 2-6

Figure 2-6.

Relay Terminal Connections for Typical Fail-Safe Application.............................. 2-6

Figure 2-7.

Connection of Typical Gas Selector Panel to Model 755A Oxygen Analyzer ....... 2-8

Figure 2-8.

Installation of Purge Kit (Optional)....................................................................... 2-12

Figure 3-1.

Model 755A Front Panel Controls ......................................................................... 3-2

Figure 3-2.

Model 755A Internal Adjustments Locations ......................................................... 3-7

Figure 3-3.

Calibration by Pressure Decrease Setup .............................................................. 3-9

Figure 3-4.

Schematic Circuit of Alarm Relay Assembly ....................................................... 3-13

Figure 4-1.

Spherical Body in Non-Uniform Magnetic Field..................................................... 4-2

Figure 4-2.

Functional Diagram of Model 755A Paramagnetic Oxygen Measurement
System ................................................................................................................... 4-3

Figure 4-3.

Detector/Magnet Assembly.................................................................................... 4-4

Figure 5-1.

Two-Comparator OR Circuit .................................................................................. 5-2

Figure 5-2.

Ramp Generator .................................................................................................... 5-3

Figure 5-3.

Case Heater Control Circuit................................................................................... 5-4

Figure 5-4.

Case Heater Circuit ............................................................................................... 5-5

Figure 5-5.

Detector Heater Control Circuit.............................................................................. 5-6

Figure 5-6.

Detector Light Source Control Circuit .................................................................... 5-7

Figure 5-7.

Detector with First Stage Amplifier and Pressure Compensation Circuits .......... 5-10

Figure 5-8.

Pressure Signal and Reference Voltage Circuits ................................................ 5-10

Figure 5-9.

Buffer, Anticipation, and Digital Output Circuit .................................................... 5-11

Figure 5-10. Simplified Analog Output Circuit for Recorder (Showing Three Ranges) ........... 5-14
Figure 6-1.

Detector/Magnet Assembly.................................................................................... 6-4

Figure 6-2.

Detector/Magnet Assembly Wiring ........................................................................ 6-4

Figure 6-3.

Detector Adjustment .............................................................................................. 6-5

Figure 6-4.

Modification of 633689 Connector Board for Compatibility with Replacement
Lamp ...................................................................................................................... 6-6

Figure 6-5.

Lamp Alignment..................................................................................................... 6-6

Table 3-1.

Standard Gases Recommended for Calibration of Various Oxygen Ranges on
Analog Output........................................................................................................ 3-5

Table 3-2.

Model 755A Internal Adjustments.......................................................................... 3-6

Table 3-3.

Oxygen Equivalents of Common Gases.............................................................. 3-11