GE Sensing MG101 Operating Manual

Measurement & Control Moisture

MG-101

User’s Manual

910-115 Rev. E

March 2012

Measurement & Control

MG-101

Field Moisture Calibration System

User’s Manual

910-115 Rev. E March 2012

www.ge-mcs.com

Technical content subject to change without notice.

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Preface

Information Paragraphs

Note paragraphs provide information that provides a deeper understanding of the situation, but is not essential to

•

the proper completion of the instructions.

• Important paragraphs provide information that emphasizes instructions that are essential to proper setup of the

equipment. Failure to follow these instructions carefully may cause unreliable performance.

• Caution! paragraphs provide information that alerts the operator to a hazardous situation that can cause damage to

property or equipment.

• Warning! paragraphs provide information that alerts the operator to a hazardous situation that can cause injury to

personnel. Cautionary information is also included, when applicable.

Safety Issues

WARNING! It is the responsibility of the user to make sure all local, county, state and national codes,

regulations, rules and laws related to safety and safe operating conditions are met for each installation.

Auxiliary Equipment

Local Safety Standards

The user must make sure that he operates all auxiliary equipment in accordance with local codes, standards, regulations, or laws applicable to safety.

Working Area

WARNING! Auxiliary equipment may have both manual and automatic modes of operation. As equipment

can move suddenly and without warning, do not enter the work cell of this equipment during automatic operation, and do not enter the work envelope of this equipment during manual operation. If you do, serious injury can result.

WARNING! Make sure that power to the auxiliary equipment is turned OFF and locked out before you

perform maintenance procedures on the equipment.

Qualification of Personnel

Make sure that all personnel have manufacturer-approved training applicable to the auxiliary equipment.

Personal Safety Equipment

Make sure that operators and maintenance personnel have all safety equipment applicable to the auxiliary equipment. Examples include safety glasses, protective headgear, safety shoes, etc.

Unauthorized Operation

Make sure that unauthorized personnel cannot gain access to the operation of the equipment.

MG-101 User’s Manual iii

Preface

Environmental Compliance

Waste Electrical and Electronic Equipment (WEEE) Directive

GE Measurement & Control is an active participant in Europe’s Waste Electrical and Electronic Equipment (WEEE) take-back initiative, directive 2002/96/EC.

The equipment that you bought has required the extraction and use of natural resources for its production. It may contain hazardous substances that could impact health and the environment.

In order to avoid the dissemination of those substances in our environment and to diminish the pressure on the natural resources, we encourage you to use the appropriate take-back systems. Those systems will reuse or recycle most of the materials of your end life equipment in a sound way.

The crossed-out wheeled bin symbol invites you to use those systems.

If you need more information on the collection, reuse and recycling systems, please contact your local or regional waste administration.

Visit http://www.ge-mcs.com/en/about-us/environmental-health-and-safety/1741-weee-req.html take-back instructions and more information about this initiative.

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iv MG-101 User’s Manual

Contents

Information Paragraphs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Safety Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Auxiliary Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Environmental Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Chapter 1. General Information

1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.3 Initial Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.1 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.2 Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.3 Operating Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Chapter 2. Setup and Operation

2.1 Preliminary Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.2 Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

2.2.1 Calibrating the Moisture Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.2.2 Using Data Table 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.2.3 Using Data Table 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

2.2.4 System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

2.2.5 Preparation for Shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Chapter 3. Specifications

3.1 Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

3.2 Operating Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

3.3 Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Appendix A. Supplemental Information

A.1 Formulas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

A.2 Typical Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

A.2.1 Example 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

A.2.2 Example 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

A.3 Vapor Pressure and Calibration Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

MG-101 User’s Manual v

Contents

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vi MG-101 User’s Manual

Chapter 1. General Information

1.1 Introduction

The MG-101 Field Calibration System is a portable moisture generator used for checking and, if necessary, recalibrating GE Sensing moisture probes. The MG-101 can generate dew/frost points in the range of -75 to +20°C (-103 to +68°F) dew/frost point temperature. It is a totally mechanical device requiring only a supply of dry nitrogen, and it is inherently explosion-proof. Although specifically designed for calibrating GE Sensing moisture probes, the MG-101 can be used for any application requiring accurate and repeatable moisture samples.

1.2 Theory Of Operation

Precise moisture concentrations are generated by passing dry nitrogen through a water saturator and mixing the resulting saturated stream with a dry nitrogen stream from the same source, for a first dilution.

This resulting first dilution is then further diluted in a second mixing stage, resulting in dew/frost point temperatures as low as -75°C (-103°F).

The MG-101 consists of the following components:

• Pressure regulator

• Four adjustable rotameters (flowmeters with valves)

• Saturator bottle

• Filter

• Temperature gauge

• Vent valve

See the diagram and explanation in Figure 1 on page 2 for a description of how the MG-101 works.

MG-101 User’s Manual 1

Chapter 1. General Information

Regulator

Pressure

Dry Gas

Inlet

Dry Gas

Wet Gas

Flowmeter

5µ Filter

Temp

Saturator

Bottle

Gas

Outlet

First Dilution

Flowmeter

Dry Gas

Second Dilution

Flowmeter

Wet Gas

Diluted

Flowmeter

Vent Valve

Dry Down

Valve

1.2 Theory of Operation (cont.)

As shown in Figure 1 below, dry nitrogen enters at the dry gas inlet A, passes through the fixed internal pressure regulator, and splits into the following three streams:

• B - dry gas “first dilution”

• C - wet gas

• D - dry gas “second dilution”

Stream to form a “Wet gas diluted” mixture (stream generate the desired output mixture (stream

Obtaining an accurate output mixture requires careful adjustment of the rotameter valves as described in “Setup and Operation” on page 5. Calibration of all rotameters and the thermometer is traceable to NIST standards.

Note: The rotameter scales are used in later steps to reference a lookup table. By themselves, they do not indicate

B (the dry gas “first dilution”) is mixed with stream C (the wet gas) after it passes through the saturator bottles

E). This is then mixed with stream D (the “dry gas second dilution”) to

F).

units of flow.

Figure 1: Flow Schematic

2 MG-101 User’s Manuall

Chapter 1. General Information

1.3 Initial Considerations

This section presents some general guidelines to ensure accurate results with the MG-101.

1.3.1 Operating Range

While the driest dew/frost point temperature capability specified for the MG-101 is -75°C (-103°F), the actual limit is determined by the moisture content of the dry nitrogen source and by the ambient temperature.

The driest dew/frost point temperature the MG-101 can produce is the dew/frost point temperature of the dry nitrogen source plus 25°C (45°F). If dry nitrogen of this quality is not available, please contact GE Sensing for assistance. The wettest dew/frost point temperature that can be generated is determined by the ambient temperature, and it must be at least 10°C (18°F) below the ambient temperature.

1.3.2 Operating Environment

The MG-101 is designed to be used indoors or in an environment where ambient temperature changes are not extreme and where the instrument will not be subject to dramatic heating or cooling. It is important to ensure that the temperature of the calibrator and especially the saturator bottle will not change between the beginning and the end of the calibration cycle.

IMPORTANT: Changes in the saturator bottle temperature after the calibration parameters have been established will

cause errors in the generated dew/frost point temperature.

CAUTION!

The MG-101 can be damaged by freezing. Do not operate it in freezing temperatures.

1.3.3 Operating Requirements

You will need the following additional equipment to set up and operate the MG-101 calibrator:

• Nitrogen, preferably from a liquid source

Note: Nitrogen gas cylinders may be used, but the supply gas must be at least 25°C (45°F) drier than the driest

dew/frost point temperature to be generated. Two nitrogen cylinders connected in parallel and plumbed to the inlet of the MG-101, will increase the stability of the gas supply.

• Stainless steel pressure regulator to set the inlet pressure to 55 psig

• 1/4” OD stainless steel tubing

• An appropriate test chamber

Note: GE Sensing Sample Cell #2830 is preferred for M2 Type probes

• A hygrometer to monitor the moisture sensor for either:

• the dew/frost point reading, if simply verifying the moisture sensor performance, or

• the sensor output signal, if generating a new calibration curve

Note: The hygrometer used for the calibration can be either a dedicated instrument for use only with the moisture

generator or the process instrument that will be used with the recalibrated sensor after the calibration is completed.

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