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HumiLab
GE HumiLab User Manual
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34
Chapter 4 — T
heory of Operation
ature is always at the dew point of the gas being measured, and it
follo
ws the dew point if it changes. A precision thermometer
element embedded within the mirror directly monitors this dew
point temperature and provides a continuous readout to the user
.
Figure 1
2 — Chilled Mirr
or S
ensor Block Diagram
37
39
Table of Contents
Default Chapter
3
Table of Contents
3
Introduction
5
About GE General Eastern
5
Overview of the Humilab
6
About this Owner's Manual
6
Chapter 1 - Installation and Initial Setup
8
Introduction
8
Pre-Installation
8
Components Shipped with the Humilab
8
System Diagram
9
Installation
10
Place the Humilab at Its Operating Site
10
Connect a Dry Gas Source (Optional)
10
Electrical Connections
12
Rear Input/Output Fitting Connections
13
Initial Setup and Water Fill
15
Chilled Mirror Setup
16
Initialize the Dew Point Sensor
16
Clean and Balance the Dew Point Sensor
17
Shipping the Humilab
19
Chapter 2 - Operation
20
Introduction
20
Front Panel Displays and Switches
21
Performing Routine Calibrations
24
Chamber Response Time
25
Chapter 3 - Using the Prostep Software
26
Introduction
26
Installing the Prostep Software
27
Running Prostep
28
Chapter 4 - Theory of Operation
34
Overview
34
Divided Flow
34
The Humilab Chilled Mirror Controller
35
What Is Optical Condensation Hygrometry
36
General Description of the Chilled Mirror Hygrometer System
37
Chilled Mirror Hygrometer System Theory of Operation
37
Chapter 5 - Maintenance and Troubleshooting
39
Introduction
39
Basic Maintenance
39
Reference Measurement Maintenance
40
Mirror Maintenance
40
Cleaning the Sensor Mirror
40
Balancing the Sensor Optics
41
Field Replacement of the Sensor Mirror
44
Annual Recertification
45
Troubleshooting the Humilab, System Diagnostics
45
Is the System Operating Correctly
45
Appendix A - Specifications
47
Appendix B - Humilab Chilled Mirror Hygrometer Details
49
Introduction
49
System Components
49
Front Panel Operation and Displays
50
Displays
51
Switches
52
Option Selections Using the Display Switch
53
A Simplified Explanation of the Option Selection System
53
A more Rigorous Explanation of the Option Selection System
54
RS-232C Re-Programming Mode
56
The Main Menu
57
Scale Outputs
57
Set Balance Type
58
Set RS-232 Units
59
Display Option
60
Set Averaging
61
Service and Troubleshooting Procedures
62
Helpful Hints
65
Time Response
65
Mirror Cleanliness
65
Appendix C - Configuring the Rs-232 Interface
69
Introduction
69
Establishing RS-232 Communications
69
Using RS-232C Communications
70
RS-232C Operate Mode
70
Computer Connections
71
Appendix D - Humidity Equations and Conversion Charts
72
Appendix E - Warranty Information and Return Procedures
77
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GE HumiLab Specifications
General
Brand
GE
Model
HumiLab
Category
Portable Generator
Language
English
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