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Emerson 755A manual available for free PDF download: Instruction Manual
Emerson 755A Instruction Manual (90 pages)
Oxygen Analyzer
Brand:
Emerson
| Category:
Measuring Instruments
| Size: 5.19 MB
Table of Contents
Table of Contents
3
Preface
9
Definitions
9
Intended Use Statement
10
Safety Summary
10
General Precautions for Handling and Storing High Pressure Gas Cylinders
12
Documentation
13
Compliances
13
Figure 1-1. Model 755A Oxygen Analyzer
15
Description and Specifications
15
Overview
15
Oxygen Range on Front Panel Digital Display
15
Oxygen Ranges for Recorder Readout
16
Recorder Voltage and Current Outputs
16
Automatic Pressure Compensation
16
Options
16
Alarm
16
Case Mounting
16
Electrical Power
16
Figure 1-2. Model 755A Component and Adjustment Locations
17
Specifications
18
General
18
Sample
18
Electrical
19
Physical
19
Installation
21
Unpacking
21
Location and Mounting
21
Voltage Requirements
21
Electrical Connections
21
Line Power Connections
21
Recorder Connections
22
Potentiometric Output
22
Figure 2-1. Electrical Connections
22
Figure 2-2. Control Board
23
Figure 2-3. Connections for Potentiometric Recorder with Non-Standard Span
23
Isolated Current Output (Optional)
24
Output Connections for Dual Alarm Option
24
Alarm Output Connections
24
Figure 2-4. Model 755A Connected to Drive Several Current-Activated Output Devices
24
Alarm Relay Characteristics
25
Figure 2-5. Typical Alarm Settings
26
Figure 2-6. Relay Terminal Connections for Typical Fail-Safe Application
26
Calibration Gases
27
Zero Calibration Gas
27
Downscale Standard Gas
27
Upscale Standard Gas
27
Sample Handling
27
Sample Temperature Requirements
27
Sample Pressure Requirements: General
27
Figure 2-7. Connection of Typical Gas Selector Panel to Model 755A Oxygen Analyzer
28
Normal Operation at Positive Gauge Pressures
29
Operation at Negative Gauge Pressures
29
Sample Flow Rate
29
Corrosive Gases
30
Leak Test
30
Purge Kit (Optional)
31
Figure 2-8. Installation of Purge Kit (Optional)
32
Operation
33
Overview
33
Selection of Recorder Oxygen Range
33
Recorder Oxygen Range Selection Procedure
33
Figure 3-1. Model 755A Front Panel Controls
34
Readout of Applied Zero-Suppression Voltage on Digital Display
35
Startup Procedure
36
Calibration
36
Calibration Using Digital Readout for Oxygen Readout
36
Calibration Using Recorder for Oxygen Readout
36
Table 3-1. Standard Gases Recommended for Calibration of Various Oxygen Ranges on Analog Output
37
Table 3-2. Model 755A Internal Adjustments
38
Figure 3-2. Model 755A Internal Adjustments Locations
39
Calibration with Downscale and Upscale Standard Gases
40
Calibration of Automatic Pressure Compensation
40
Figure 3-3. Calibration by Pressure Decrease Setup
41
Compensation for Composition of Background Gas
42
Oxygen Equivalent Values of Gases
42
Oxygen Equivalents of Gas Mixtures
42
Computing Adjusted Settings for Zero and Span Controls
42
Table 3-3.Oxygen Equivalents of Common Gases
43
Dual Alarm Option
44
Initial Calibration and Selection of Setpoints for Alarms
44
Selection of Deadband
45
Figure 3-4. Schematic Circuit of Alarm Relay Assembly
45
Routine Operation
46
Effect of Barometric Pressure Changes on Instrument Readout
46
Calibration Frequency
46
Theory
47
Principles of Operation
47
Magnetic Displacement Force
47
Physical Configuration of Detector/Magnet Assembly
48
Figure 4-1. Spherical Body in Non-Uniform Magnetic Field
48
Figure 4-2. Functional Diagram of Model 755A Paramagnetic Oxygen Measurement System
49
Figure 4-3. Detector/Magnet Assembly
50
Variables Influencing Paramagnetic Oxygen Measurements
51
Pressure Effects
51
Temperature Effects
51
Interferents
51
Vibration Effects
51
Electronic Circuitry
52
Detector/Magnet Assembly
52
Control Board and Associated Circuitry
52
Case Board
53
Isolated Current Output Board (Optional)
54
Alarm Option
54
Circuit Analysis
55
Overview
55
15VDC Power Supply
55
Case Heater Control Circuit
55
Figure 5-1. Two-Comparator or Circuit
56
Figure 5-2. Ramp Generator
57
Figure 5-3. Case Heater Control Circuit
58
Figure 5-4. Case Heater Circuit
59
Figure 5-5. Detector Heater Control Circuit
60
Detector Heater Control Circuit
60
Figure 5-6. Detector Light Source Control Circuit
61
Detector Light Source Control Circuit
61
Detector with First Stage Amplifier and Pressure Compensation Circuits
62
Pressure Compensation Circuit
63
Pressure Signal Circuit
63
Positive and Negative Reference Voltage Circuits
63
Figure 5-7. Detector with First Stage Amplifier and Pressure Compensation Circuits
64
Figure 5-8. Pressure Signal and Reference Voltage Circuits
64
Figure 5-9. Buffer, Anticipation, and Digital Output Circuit
65
Buffer Amplifiers U10 and Associated Anticipation Function
65
Digital Output Circuit
66
Analog Output Circuits for Recorder and Alarms
66
Figure 5-10. Simplified Analog Output Circuit for Recorder (Showing Three Ranges)
68
Service and Maintenance
69
Initial Checkout with Standard Gases
69
Detector Component Checks
70
Detector
70
Source Lamp
70
Photocell
70
Suspension
70
Detector Component Replacement
71
Detector Replacement
71
Figure 6-1. Detector/Magnet Assembly
72
Figure 6-2. Detector/Magnet Assembly Wiring
72
Source Lamp Replacement
73
Figure 6-3. Detector Adjustment
73
Figure 6-4. Modification of 633689 Connector Board for Compatibility with Replacement Lamp
74
Figure 6-5. Lamp Alignment
74
Photocell Replacement and Adjustment
75
Heating Circuits
75
Case Heater Control Circuit
75
Detector/Magnet Heating Circuit
76
Replacement Parts
77
Circuit Board Replacement Policy
77
Selected Replacement Parts
77
Matrix
78
Return of Material
79
Customer Service
79
Training
79
A-1 Overview
81
A-3 Installation
81
A-2 Circuit Function
81
Appendix A - Vaisala Barometric Pressure Transducer
81
Overview
81
Circuit Function
81
Installation
81
A-4 Adjustment
82
A-5 High Altitude Version (Option)
82
Adjustment
82
High Altitude Version Option
82
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