GE Sensing MMY31 Operating Manual
GE Industrial
Sensing
DewPro MMY31
General Eastern Trace Moisture Transmitter
Installation and Operation Manual
GE Industrial
Sensing
DewPro MMY31
General Eastern Trace Moisture Transmitter
Installation and Operation Manual
A40251548A
September 2005
The
DewPro MMY31
GE high-technology sensing businesses under a new name—GE Industrial Sensing.
is a General Eastern Instruments product. General Eastern Instruments has joined other
September 2005
Warranty Each instrument manufactured by GE Infrastructure Sensing, Inc. is
warranted to be free from defects in material and workmanship.
Liability under this warranty is limited to restoring the instrument to
normal operation or replacing the instrument, at the sole discretion of
GE Infrastructure Sensing, Inc. Fuses and batteries are specifically
excluded from any liability. This warranty is effective from the date of
delivery to the original purchaser. If GE Infrastructure Sensing, Inc.
determines that the equipment was defective, the warranty period is:
• one year for general electronic failures of the instrument
• one year for mechanical failures of the sensor
If GE Infrastructure Sensing, Inc. determines that the equipment was
damaged by misuse, improper installation, the use of unauthorized
replacement parts, or operating conditions outside the guidelines
specified by GE Infrastructure Sensing, Inc., the repairs are not
covered under this warranty.
The warranties set forth herein are exclusive and are in lieu of
all other warranties whether statutory, express or implied
(including warranties of merchantability and fitness for a
particular purpose, and warranties arising from course of
dealing or usage or trade).
Return Policy If a GE Infrastructure Sensing, Inc. instrument malfunctions within the
warranty period, the following procedure must be completed:
1. Notify GE Infrastructure Sensing, Inc., giving full details of the
problem, and provide the model number and serial number of the
instrument. If the nature of the problem indicates the need for
factory service, GE Infrastructure Sensing, Inc. will issue a RETURN
AUTHORIZATION number (RA), and shipping instructions for the
return of the instrument to a service center will be provided.
2. If GE Infrastructure Sensing, Inc. instructs you to send your
instrument to a service center, it must be shipped prepaid to the
authorized repair station indicated in the shipping instructions.
3. Upon receipt, GE Infrastructure Sensing, Inc. will evaluate the
instrument to determine the cause of the malfunction.
Then, one of the following courses of action will then be taken:
• If the damage is covered under the terms of the warranty, the
instrument will be repaired at no cost to the owner and returned.
• If GE Infrastructure Sensing, Inc. determines that the damage is not
covered under the terms of the warranty, or if the warranty has
expired, an estimate for the cost of the repairs at standard rates
will be provided. Upon receipt of the owner’s approval to proceed,
the instrument will be repaired and returned.
iii
September 2005
Table of Contents
Chapter 1: General System Information
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
First 4–20mA Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Planar Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Chapter 2: Installation
Mounting the MMY31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Wiring Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Designing the Loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
In a Normal Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
In Environments with Severe Electrical Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
General Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Chapter 3: Troubleshooting
The Loop Current is Out of Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
There Is No Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Chapter 4: Optional Display/User Interface
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Removing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Programming Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Push Buttons - Special Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Reset to “Normal” Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Display Only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Changing Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Matrix Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Display and Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Special Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Mode of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Chapter 5: Specifications
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Optional Onboard Display with User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
EMI/RFI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
iv
Chapter 1
General System Information
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
September 2005
Unpacking and Inspection
Upon receipt of the DewPro MMY31, 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 MMY31
• Installation and Operation Manual
• Calibration Certificate
Compare the last five numbers or letters on the model number (on the
product label shown in Figure 1-1 below) with the product structure
(see below) to ensure you have received everything you ordered.
GE Sensing
1100 Technology Park Dr.
Billerica, MA 01821 USA
Model:
S/N:
Supply:
Range:
Pressure Rating:
MMY31 - R8A2A
Figure 1-1: DewPro MMY31 Product Label
General System Information 1-1
September 2005
Certification/Approvals:
R Standard Certification (not certified)
A FM IS Cl. I, II, III, Div. 1; Grps. A-G
B FM XP Cl. I, Div. 1; Grps. A-D
C FM NI Cl. I, Div. 2, Grps. A-D; Cl. II, III, Div. 1; Grps. E-G
F ATE X 3GEEx nA EEx 11C T4
S Other
Table 1: Model Number Configuration
Process Connection:
2 ¾” NPT-M compression fitting
3 ½” NPT-M compression fitting
4 ¾” x 16 “O” ring compression fitting (UNF thread)
6 No mounting hardware
8 G½ compression fitting with gasket
S Other
Protective Cap:
A Standard with 100 micron sintered filter
B Without sintered filter
S Other
Enclosure Conduit:
1 Enclosure Conduit M20 x 1.5-F with cable gland and plug
2 Enclosure Conduit M20 x 1.5-F with ½” FNPT adapter and plug
S Other
Output Configuration/Dewpoint Range:
A Td –90°C to +10°C (–130°F to +50°F), no display, error 22 mA
B Td –90°C to +10°C (–130°F to +50°F), no display, error Hold
C Td –90°C to +10°C (–130°F to +50°F), no display, error 3.6 mA
D 0-100 ppm
E 0-100 ppm
F 0-100 ppmv 1 bar, no display, error 3.6 mA
1 bar, no display, error 22 mA
v
1 bar, no display, error Hold
v
G With integral display, user interface
S Other
R 8 A 2 A Model Number example
1-2 General System Information
September 2005
Unit Description The DewPro MMY31 trace moisture transmitter is a loop-powered
dewpoint measuring device. The transmitter includes a sensor
element, a stainless steel probe, a weather-proof enclosure,
microprocessor electronics, and assorted fittings, all in a compact
assembly. It is designed to be installed “in-line.” Various types of
mounting hardware, such as flange and compression fittings, are
available for mounting into a process chamber or pipe.
An optional display with user interface feature allows the DewPro to
be configured by the user. See Chapter 4 for more information.
Theory of Operation
4–20mA Loop The DewPro MMY31 microcontroller operated electronics works
with a voltage supply of 12 to 28 VDC. At the nominal 24 VDC
supply, the maximum loop resistance is 600 ohms. The signal is
represented by the 4–20 mA loop current and is directly proportional
to the dewpoint temperature range in °C or °F. In the standard range,
4 mA corresponts to –90°C (–130°F) and 20 mA to +10°C (+50°F)
dewpoint temperature. The optional unit of measure is ppm
standard range 0-100 ppm
, unless ordered differently
v
in the
v
Planar Sensor The heart of the MMY31 is the planar sensor element. It incorporates
a superior aluminum oxide sensor that provides longer calibration
stability, excellent corrosion resistance, and improved speed of
response. The sensor, mounted on a ceramic substrate, also has a
reduced temperature coefficient.
Calibration Each DewPro is factory calibrated against precise NIST certified
moisture references and has an accuracy of ±2°C dewpoint at 25°C
temperature. For field validation, GE Sensing offers a unique
validation device. The MMY245 field validator connects to the
DewPro on site and offers a one-point or two-point correction.
General System Information 1-3
Chapter 2
Installation
Mounting the MMY31 (cont.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Wiring Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
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