General Eastern MMY245 Operating Manual
DewPro MMY245
Installation and Operation Manual
DewPro MMY 245
Portable Moisture Analyzer
Installation and Operation Manual
GE General Eastern
GE Measurement & Sensing Technologies
GE General Eastern
DewPro MMY245
Installation and Operation Manual
General Notes
Attention!
This is a portable moisture analyzer. The success and accuracy of moisture measurements and of field
validation depends on the integrity of the care exercised in operating this equipment. All fittings and
tubing should be tightened properly and examined prior to each use for thread or quick connect fitting
damage, leaks or crimped hoses. If any damage is suspected, do not place the unit in service until the
suspected damage is repaired. DO NOT alter or modify any of the supplied components. This will not
only void the Warranty but could rupture components causing injury or death. Tampering with internal
components will likely produce errors in the instrument readings.
Caution!
Before using or installing the DewPro MMY 245, please read all instructions.
Safety!
The DewPro MMY 245 Portable Moisture Analyzer is designed for connection to pressurized
gaseous systems. Be certain to de-pressurize the system before connecting or disconnecting the hoses
or fittings to the analyzer or at the process connection.
Disclaimer
General Eastern Instruments, Inc. reserves the right to change or modify our products in appearance or performance specifications at any time
and without notice. Therefore, information in this document is subject to change without notice and does not represent a commitment on the
part of General Eastern Instruments, Inc.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and
recording, for any purpose without the express written permission of General Eastern Instruments, Inc.
Technical Assistance
If you should have any questions regarding the product described in this document, or need further
assistance, please contact your local General Eastern Instruments (GEI) representative or the factory at
800-33HUMID (800-334-8643). When contacting the factory for technical support, please have your
serial number ready. This number is located inside the unit and can be accessed by loosening the two
knurled screws on the top of the unit.
Serial Number: _______________________________
GE General Eastern
DewPro MMY245
Installation and Operation Manual
TABLE OF CONTENTS
1 General System Information __________________________________________________3
1.1 Unpacking and Inspection_________________________________________________________3
1.2 System Description_______________________________________________________________4
1.2.1 Portable Trace Moisture Analyzer ______________________________________________________ 4
1.2.1.1 Versatility_____________________________________________________________________ 4
1.2.1.2 Safety ________________________________________________________________________ 4
1.2.1.3 User Friendly Operation__________________________________________________________ 4
1.2.2 Field Validator _____________________________________________________________________ 5
1.3 Theory of Operation _____________________________________________________________5
1.3.1 Sensor Theory______________________________________________________________________ 5
1.3.2 Sample System Operation_____________________________________________________________ 5
1.3.3 Software Features ___________________________________________________________________ 6
1.3.4 Sample Conditioning Practices and Precautions____________________________________________ 6
1.3.4.1 Internal Construction ____________________________________________________________ 6
1.3.4.2 Avoid Liquid Samples ___________________________________________________________ 6
1.3.4.3 Avoid High Temperatures ________________________________________________________ 6
1.3.4.4 Avoid High Pressure Samples _____________________________________________________ 6
1.3.4.5 Hazardous Gas Handling _________________________________________________________ 6
1.3.4.6 Avoid Particulate Contamination___________________________________________________ 6
1.3.4.7 Avoid Corrosive Chemicals _______________________________________________________ 7
1.3.4.8 Avoid Ambient Air _____________________________________________________________ 7
1.3.4.9 Piping Recommendations_________________________________________________________ 7
Dimensions _________________________________________________________________________7
Basic Operation ________________________________________________________________8
2.1 Operating Controls ______________________________________________________________8
2.2 Display Elements ________________________________________________________________8
2.3 Basic Sampling or Spot-Checking __________________________________________________9
2.4 General Operation Practice _______________________________________________________9
2.4.1 Mapping spot check route____________________________________________________________ 10
2.4.2 Temporary Monitoring ______________________________________________________________ 10
2.4.3 Moisture Measurement Practice _______________________________________________________ 10
2.4.3.1 Checking Dryer Performance_____________________________________________________ 10
2.4.3.2 Quality Assurance _____________________________________________________________ 11
2.5 Instrument Setup / Programming _________________________________________________11
2.5.1 Matrix Orientation _________________________________________________________________ 11
2.5.2 Special Functions of the Push Buttons __________________________________________________ 13
2.5.3 Function Guide ____________________________________________________________________ 13
2.5.4 Matrix Field Details ________________________________________________________________ 13
2.5.5 Special Output and Input Functions ____________________________________________________ 15
2.5.6 Interconnection ____________________________________________________________________ 16
2.5.6.1 External Power Option__________________________________________________________ 16
2.5.6.2 External Scalable Input Option.___________________________________________________ 16
2.5.6.3 Voltage Inputs ________________________________________________________________ 16
2.5.6.4 Output connections ____________________________________________________________ 17
3 Troubleshooting ___________________________________________________________17
3.1 General Troubleshooting Practice _________________________________________________17
3.2 Error Codes ___________________________________________________________________18
4 Field Validator Operation ___________________________________________________ 19
GE General Eastern
DewPro MMY245
Installation and Operation Manual
4.1 Optimum Validation Practice _____________________________________________________20
4.2 MMY 3 Transmitter Preparation__________________________________________________21
4.3 Validator Connection Options ____________________________________________________21
4.3.1 Transmitter Vent (series) Connection___________________________________________________ 22
4.3.2 Vacuum Application Connection ______________________________________________________ 22
4.3.3 Parallel Connection_________________________________________________________________ 23
4.3.4 Closed Loop Connection ____________________________________________________________ 24
4.4 Field Validator Setup____________________________________________________________25
4.4.1 Matrix Orientation _________________________________________________________________ 25
4.4.2 Single Point Validation Function Guide_________________________________________________ 26
4.4.3 Two-point Validation Function Guide __________________________________________________ 26
5 Troubleshooting Validator Operation __________________________________________27
6 Instrument Specifications____________________________________________________28
7 Appendix _________________________________________________________________29
GE General Eastern
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DewPro MMY245
Installation and Operation Manual
1 General System Information
1.1 Unpacking and Inspection
Upon receipt of the DewPro® MMY245, examine the shipping carton for broken or open packing,
distortion, or any other evidence of mishandling. If inspection indicates damage to the unit or any of its
components, notify the carrier (within 15 days of delivery) and request an inspection. Move the carton
to a clean work area and unpack. The carton you receive should contain:
DewPro® MMY245
Installation and Operation Manual
All MMY 245 accessories ordered as separate line items
Compare the model number with the product structure below to ensure proper receipt of order. If an
error should be discovered, do not put the instrument into service and contact the factory immediately.
Product Structure
1 Certification
R Standard
Y Other
2 Pressure Compensation
R Basic configuration
P Pressure sensor built-in for ppm compensation
MMY245-
Accessories
Part No. Description
63005033 Carrying case including shoulder strap
63005032 Shoulder strap
63004006
63004005
Cable assembly, MMY 245 to DewPro
Connector/cable assembly, RS485 DewPro
installation in the transmitter for external connection to P/N 63004006)
63002013 Connector/cable assembly, external power and non-I.S. outputs.
Gas Connection Accessories
63000598 Gas Inlet and outlet connection, ¼” tube 316 SS
63002201 Gas Inlet and outlet connection, 6mm tube 316 SS
63002199 Gas inlet, 3 ft. PFA hose with quick connect set and ¼” tube process connection
63002200 Gas inlet and outlet connection, ¼” tube PFA
63005036 Coalescing Filter for Glycol Contactor Applications
63005037 Pressure Regulator for samples greater than 125 psig.
MMY 30, RS485 cable
(RS 485 communication cable for
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DewPro MMY245
Installation and Operation Manual
1.2 System Description
1.2.1 Portable Trace Moisture Analyzer
The DewPro MMY 245 Moisture Analyzer is designed primarily as a portable moisture instrument
that can be used in a variety of gaseous applications. The portable unit can be used to quickly spot
check the performance of dryers for compressed air, natural gas. Checking pure gas supplies, accurately
testing SF6 gas in high power switchgear and transformers, gasified LNG, breathing air or oxygen and
many other applications are easy with the MMY 245 portable analyzer.
This is a well balanced, compact, easy to use versatile analyzer complete with all the units of measure
and connectability required to keep track of the moisture critical processes in your facility. The rugged
DewPro
MMY 245 case has been selected to provide the maximum protection for the internal
components in most any industrial environment where it is used.
With the MMY 245 Portable Moisture Analyzer, measurement time is typically 5 minutes. The sensor
is kept in a very dry desiccated environment with the dry-down taking place while the instrument is
inactive or being transported to the next measurement point. For complete instrument specifications,
see Section 6.
1.2.1.1 Versatility
The variety of applications in which the DewPro MMY 245 can be used is limited only by its range of
operation for moisture and pressure and by the chemical nature of the gas sample. The unit is designed
to be used for dry samples having a dew point temperature below freezing at the pressure of the sample
introduced to the unit. Some typical applications are listed below:
Desiccant dried air Dried Natural Gas Argon gas for welding
Nitrogen gas supplies Breathing air SF
Helium gas supplies Oxygen gas supplies Hydrogen cooling loops
Instrument air Glove box gas purifier loops Ethylene Production
Heat treating atmosphere
Gas Bottle filling operations … and many others.
generators
The processes listed above often require many different units of measure and the MMY 245 is able to
provide readouts in most of the common units necessary for these applications. The unit of measure is
simply selected from the operating keypad. An optional pressure sensor will automatically correct for
changes in pressure that occur in a given stream or when spot-checking several sample points
throughout a facility or process.
gas for switchgear
6
1.2.1.2 Safety
The DewPro MMY 245 has been designed to meet or exceed the FM requirements for Class I,
Division 1 environments for portable instruments.
1.2.1.3 User Friendly Operation
The normal method of measurement is to connect the DewPro MMY 245 to the process sample tap via
a short flexible high-pressure hose that employs a quick-connect fitting. The sample valve on the
process piping is opened to start a sample flow to the unit. After allowing the sample flow to purge the
hose for 15-30 seconds, the handle on the side of the analyzer is rotated up to the vertical position. This
directs the sample across the sensor. The power button is pressed and the readout provides the moisture
value in the desired unit of measure.
The analyzer is programmed using the keypad and a matrix to select the moisture unit of measure,
temperature unit of measure and other operating parameters. An optional pressure sensor can provide
real time correction for concentration units of measure. In lieu of the optional sensor, a pressure
constant can provide the proper value with known pressure conditions.
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DewPro MMY245
Installation and Operation Manual
1.2.2 Field Validator
This portable unit can validate the readings of permanently installed GEI loop-powered dew point
transmitters while they are in the loop, simply by connecting the MMY 245 to the DewPro’s
monitoring the same sample. This is accomplished by monitoring the same sample as the transmitter by
connecting to its outlet. Either a single-point or two-point validation mode can be selected via the
keypad and matrix. An RS-485 connection between the portable and the transmitter provides for digital
correction of the transmitter’s calibration data. The procedure takes from one to four hours and
eliminates transmitter downtime and reduces the need for sending transmitters back to the factory for
recalibration. The complete description of this feature can be found in section 4 of this manual. This
validation is not a field calibration technique since most calibrations require the standard to be four
times more accurate than the device under test. The MMY 245 does not have that accuracy advantage
and should be used to adjust transmitters in the field with this in mind.
outlet and
1.3 Theory of Operation
The DewPro MMY 245 operates as a self-contained moisture analyzer system comprised of a sensor,
electronics, power source, and sample system.
The sensor is an advanced Planar Gold/Aluminum Oxide sensor designed to respond quickly to changes
in measuring conditions. It has been used extensively in trace moisture analyzers for several years. This
trusted sensor is resistant to contamination and has proven to be a rugged and stable platform for
consistent results in measurement accuracy and reliability.
The electronics package was designed using the basic DewPro
to the introduction of the portable configuration. With proven reliability and ruggedness and with the
addition of memory and energy management components, the MMY 245 provides the flexibility
required for many applications.
Four standard “D” cell batteries supply the power for the MMY 245. Standard alkaline batteries are
included and are recommended for replacement.
The internal sample system provides for purging the hoses after they are connected to the sample tap
and then directs the sample across the sensor.
technology developed four years prior
1.3.1 Sensor Theory
The Planar Gold / Aluminum Oxide sensor is a capacitance based technique for detecting the moisture
content in gaseous samples. This sensor is manufactured using semiconductor techniques on wafers of
ceramic substrate. The sensor is manufactured by depositing a pure aluminum layer over gold contact
pads on a ceramic substrate. The aluminum is partially anodized using a proprietary process and a thin
film of permeable gold is deposited over the oxide layer. The aluminum oxide is a porous insulator and
provides a space for moisture molecules to reside at equilibrium with the sensor environment. The
permeable gold conductive layer allows moisture molecules to move freely into or out from the oxide
layer and acts as one plate of the capacitor. The aluminum layer beneath the oxide acts as the opposing
plate for the capacitor. After the sensors are created on the wafer, they are diced apart and each sensor
is then bonded to a pressure rated feed-through on a probe. The probe supports the sensor in the process
environment for which it is rated.
1.3.2 Sample System Operation
The main component of the sample system in the DewPro MMY 245 is essentially a valve. The valve
emulates a four-way process valve during operation. In the “dry” or horizontal position, the sensor is
exposed to a very dry, -85° to –95°F, (-65° to –72°C) dew point environment created by a very strong
desiccant. This keeps the sensor dry and ready to measure. Any sensor will respond quickly to
increasing moisture and dries down much more slowly. In the “measure” or vertical position of the
valve handle, the sample stream is directed across the sensor to allow the measurement to be made.
Just as in a four-way process valve, there is a second function in operation concurrent with the “flow”
description above. When in the “dry” position, the passage for the sample connection inlet is connected
to the outlet for purging the connecting hoses. This purging operation is critical for making the
measurement as quickly as possible since a fresh sample is transferred to the immediate sensor location
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DewPro MMY245
while the sensor itself is kept dry and ready to measure. Purging for 3-5 minutes is recommended. In
the “measure” position of the valve handle, the desiccant chamber is closed from any possible contact
with the incoming sample gas. This prevents the desiccant from being contaminated or consumed too
quickly. The desiccant should last several months under daily use for several readings per day.
An optional pressure transducer can be ordered to provide pressure information to the electronics for
compensation of readings in concentration units of measure. These units of measure require a total
pressure value to correctly compute the proper moisture reading. The pressure information can be
displayed and used for correction of the moisture reading from this pressure sensor or from a direct
input of a constant value as selected using the keypad.
Installation and Operation Manual
1.3.3 Software Features
The software architecture is based on a matrix of operating parameters. Each parameter setting
determines the function of the software to display and compute the proper moisture value, to control
outputs and to communicate with field mounted MMY series transmitters. The matrix settings also
determine how to treat optional inputs and when they should be used in the computation of a moisture
value. The complete operation of the matrix is described in the Instrument Setup portion of the Basic
Operation, Section 2 in this manual.
1.3.4 Sample Conditioning Practices and Precautions
1.3.4.1 Internal Construction
All the wetted surfaces of the MMY 245 DewPro are electro-polished non-hygroscopic metal
components of either stainless steel or anodized aluminum. Introducing clean samples will prevent
these surfaces from becoming contaminated.
1.3.4.2 Avoid Liquid Samples
Avoid ANY liquid exposure of the sample lines and the instrument. Liquids will damage the unit and
void the Warranty.
1.3.4.3 Avoid High Temperatures
Avoid high or low temperatures. The MMY 245 can be operated over a temperature range of 4°F to
104°F (-20° C to +40° C). Operating the unit at higher temperatures can damage the sensor and the
electronics. The LCD is not likely to work if the unit is operated below the normal stated range.
1.3.4.4 Avoid High Pressure Samples
The maximum inlet pressure rating for the MMY 245 is 150 PSIG or 10 Bar. If the process or sample
pressure is greater than this, a pressure regulator should be used to drop the pressure to within the
instruments range.
1.3.4.5 Hazardous Gas Handling
When making connections to samples of flammable or hazardous gases, exercise care to insure leak
free connections. Be aware that leaks can create fire, explosive or toxic conditions that should be
avoided. The MMY 245 is designed to meet Class I, Division 1, Group B-G environments; but the
integrity of the sample connections to the instrument is the responsibility of the user.
1.3.4.6 Avoid Particulate Contamination
A sample contaminated with particulates will deposit some of this material inside the unit producing
more surface area and sites where moisture could be trapped. This could result in higher than actual
readings. If the sample contains particulates or aerosols, it must be filtered to remove this
contamination.
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DewPro MMY245
Installation and Operation Manual
1.3.4.7 Avoid Corrosive Chemicals
Introducing corrosive chemicals can pit or corrode the internal components and can damage the sensor.
Avoid attempting measurements in streams containing chlorine, HCl, and other strong acid or base
gases.
1.3.4.8 Avoid Ambient Air
The MMY 245 is a trace moisture analyzer. Ambient air can contain as much as 2% water. The
instrument is capable of measuring down to sub ppm
the operating handle in the measure position when not connected to a sample flow. Ambient air
exposure over long periods of time can move large amounts of moisture into the measurement cell and
eventually cause the sensor to drift.
moisture in samples to 150 psig, so avoid leaving
v
1.3.4.9 Piping Recommendations
Connection the MMY 245 to the process or sample tap in the proper manner will insure the most
accurate measurements. Connecting tubing should be made from materials that are non-hygroscopic
and capable of handling the sample pressure. Keeping the length of connecting tubing as short as
possible will allow faster readings since the moisture in the sample arrives quicker than with longer
lines. Materials that are recommended include stainless steel, and PFA tubing especially for dew points
below –65°C, Copper and PTFE tubing. Rubber, Tygon and other plastic or polymer tubing is NOT
recommended for ANY application. Insure that all connections at the sample tap and at the instrument
are leak tight.
1.4 Dimensions
Figure 1
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DewPro MMY245
V H
V H
V
V
2 Basic Operation
The MMY 245 operation is simple and
intuitive. Provide the instrument with a
sample of gas and direct it to the
sensor using the handle on the side of
the instrument, apply power and let the
analyzer tell you when the
measurement is stable and should be
taken.
The instrument operates best when
measuring pressurized samples over a
range of 20-150 psig. Satisfactory
measurements can be made at lower
pressures, even at vacuum, although a
longer time may be required since
there are not as many exchanges per
minute at these lower pressures.
Techniques for these low-pressure
measurements will be discussed later
in this manual.
POWER
Installation and Operation Manual
0
-
HOME
Figure 2
H
+
-
2.1 Operating Controls
The electronic operating controls for the MMY 245 are found directly in front of the carrying handle
and the flow path control is located on the left side of the instrument. This “operating handle” of the
instrument puts the sensor into a desiccant environment or directs the flow of the sample across the
sensor.
The electronic controls provide access to the analysis of the sample. These electronic controls consist of
six membrane switches (see Figure 2) located below the digital display and are used to power the unit
and control the various functions of the unit. The POWER key will turn the unit on or off. The HOME
key will display the matrix position V0 H0 or alternately V4 H0. Pressing the V and H keys advances
the vertical or horizontal position within the matrix and the display will show the contents of that
position. Pressing the + and – keys increments or decrements the value in the matrix cell described in
the right side of the display. These matrix and operating functions will be described on succeeding
pages.
2.2 Display Elements
There are three distinct display elements consisting of a large
digital readout where values are shown, a smaller digital
section to the right where four characters are displayed
showing the location in the matrix where the values are
generated, and a bar graph across the bottom.
The MMY 245 takes the guesswork out of waiting for the
measurement to stabilize. The instrument display (see
Figure3) includes a rate-of-change bar graph indicating a
reading is changing or stable. A changing reading will cause
the bar graph to include additional segments in any portion
of the bottom of the display. The direction and amplitude
illustrated by the arrows indicate the required change in the
reading. This feature allows the operator to know the reading
has stabilized and can be recorded correctly. Below, several
different measurement techniques are discussed from the perspective of connecting the sample to the
unit; but the basics of operation remain the same.
-48.6
Stable Reading
-48.6
Reading Still Changing
Figure 3
0 0
0 0
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