GE DewPro MMY31 Installation And Operation Manual
Trace Moisture Transmitter
DewPro
®
MMY31
Installation and Operation Manual
GE Infrastructure Sensing
GE General Eastern
DewPro MMY31
Caution!
Safety
General Notes
Caution!
Before installation please read all instructions.
Safety
- The DewPro is designed to be mounted to pressurized systems. Take necessary
precautions when mounting or removing the DewPro.
GE General Eastern reserves the right to change or modify our product appearance and
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 GE
General Eastern.
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 GE General Eastern.
DewPro is a Registered Trademark of GE General Eastern.
If you should have questions regarding the product described in this document, or need
further assistance, please contact your local GE General Eastern Sales Centre
Version: FGE/ 220304/MMY31
Installation and Operation Manual
GE General Eastern
2
DewPro MMY31
Installation and Operation Manual
Contents
General Notes 2
1.0 General System Information 4
1.1 Unpacking and Inspection
1.2 Introduction
1.3 Theory of Operation
2.0 Installation Guidelines 6
2.1 Mounting the Probe
3.0 Wiring for Configurations with One 7
3.1 Wiring, General Guidelines
3.2 System Configuration, Various
3.3 Mounting in Normal Environments
3.4 Mounting in Environments with Severe Electrical Noise
3.5 Electrical Connection
3 6 General Wiring Instructions
4.0 Optional Display/User Interface 10
4.1 Installation
4.2 Description of the DewPro MMR 31 Programming Matrix
4.3 Special Functions of the Pushbuttons
4.4 Functions of the Matrix (Refer to Figure 20 or appendix 12
5.0 Troubleshooting 17
5.1 General Problems
6.0 Technical Specifications 18
7.0 Accessories 19
7.1 Available Accessories
8.0 Contact adresses 20
Appendix 21
GE General Eastern
3
DewPro MMY31
Installation and Operation Manual
1.0 General System Information
1. 1 Unpacking and Inspection
Upon receipt of the DewPro MMY 31, 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 MMY 31
• Installation and Operation Manual
Compare the model number (on the product label) with product structure (see
below) to ensure you have received everything you ordered.
GENERAL EASTERN
MODEL:
SERIAL NO:
SUPPLY:
RANGE:
P max: 500 PSIG
Product Structure MMY31
Certification/Approvals:
R Standard (not certified)
Other
Y
Process Connection
1 3" diameter galvanized floor flange with 12,7 mm (1/2” MNPT)
compression fitting
8
3 1/2" M NPT compression fitting
6 No mounting hardware
G 1/2 compression fitting (Male thread), gasket, SS ferrule
9 Other
Protective Cap:
A
Standard with 100 micron sintered filter
B Without 100 u filter
Enclosure Conduit:
1
1/2" FNPT with cable gland and plug
2 PG 16 (Female) with cable gland and plug
Output Configuration/Dewpoint Range:
A
Output 4-20 mA -90 … +10
status 22 mA
B Output 4-20 mA -90 … +10
status Hold
C Output 4-20 mA -90 … +10
fault status 3,6 mA
D
G
Output 0 … 100 ppm-v, 1 bar, no displ, error 22 mA
E Output 0 … 100 ppm-v, 1 bar, no displ, error Hold
F Output 0 … 100 ppm-v, 1 bar, no displ, error 3,6 mA
With integral display, user interface; free programmable
R 6 A 1 B
The Humidity Experts
MMY31-R 6 A 2 B
10124
9...32 VDC
o
C dewpoint, no display, fault
o
C dewpoint, no display, fault
o
C dewpoint, no display,
Unpacking
Fig. 1
Check Model
Number
GE General Eastern
4
DewPro MMY31
Installation and Operation Manual
1.2 Introduction
Unit description
The DewPro MMY 31 is a loop powered dew point transmitter for the trace moisture
range. The transmitter includes an aluminum oxide planar sensor element, a stainless
steel probe, a weather proof enclosure, and microprocessor electronics. It is designed to
be installed “in-line”. Various mounting hardware such as flange and compression fittings,
are available for mounting into a process chamber, process pipe, etc. The DewPro
MMY31 measures dew point temperature in
o
C or oF.
116
86
5
8
MODEL:
SERIAL NO:
SUPPLY:
DEWPOINT RANGE:
P max:
MMR 31
9...32 VDC
PSIG
5
2
9
7
2
Thread
G ½
8
6
1
50,8 mm
(2,0”)
74,6 mm
(3,0”)
Fig. 2
12,7
Compression fitting
1.3 Theory of Operation
4 to 20 mA
Loop
Planar Sensor
Calibration Each DewPro is factory calibrated against precise NIST certified moisture references and
The DewPro MMY 31 microprocessor controlled electronics operate with a voltage supply
of 12 to 32 V DC. At the nominal 24 V DC supply, the maximum loop resistance is 750
Ohm. The signal is represented by the 4 to 20 mA loop current and is directly proportional
to the dew point temperature range of -90
o
C to +10 oC (-130 oF to +50 oF).
The heart of the MMY31 is the newest Planar sensor element. It incorporates a new,
superior aluminum oxide sensor that provides longer calibration stability, improved
corrosion resistance, and faster speed of response. The sensor, mounted on a ceramic
substrate, also has a reduced temperature coefficient.
has an accuracy of +/- 2
o
C dew point. Recalibration should be performed approximately
once a year, depending on application and the required accuracy. GE General Eastern
has multiple calibration facilities world wide providing trace ability to national and
international standards.
GE General Eastern
5
DewPro MMY31
Installation and Operation Manual
2.0 Installation Guidelines
2.1 Mounting the Probe
Preferably, mount the probe vertically such that the sensor tip points down. Mount
the probe in a G 1/2 thread connection or with a flange. Be certain that the tip of the
probe does not touch the inside wall of the pipe.
Adjust the ferrule (nylon or stainless steel*) for a probe insertion length of 1”
(minimum) and tighten the compression fitting as follows:
• Hand-tighten the nut. Then, using a wrench, tighten the nut one and onehalf turns.
• Now the fitting is tight and can withstand pressure to 17 bar (250 psi)
(provided a stainless steel ferrule is used)
GENERAL EASTERN
The Humidity Experts
MMR 31
MODEL:
SERIAL NO:
9...32 VDC
SUPPLY:
DEWPOINT RANGE:
PSIG
P max:
Minimum 25mm
Fig. 3
GE General Eastern
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DewPro MMY31
3.0 Wiring
3.1 Wiring, General Guidelines
Caution! Caution!
The DewPro system contains electronic components that are susceptible
to damage by static electricity. Proper handling procedures must be
observed during the removal , installation, or other handling of internal boards.
3.2 System Configuration, Various
Fig. 4
8888
GENERAL EASTE RN
The Humidity Experts
NOTE: The voltage across the +/- terminal of the DewPro should not fall below 9 V DC.
The maximum loop resistance is an important measure for selection of the supply voltage.
Each device connected to the loop causes a voltage drop. For instance, using a looppowered display with an input impedance of 50 Ohm will cause a voltage drop of 1 V DC
at 20 mA following Ohm's law. Connecting the loop to a PLC will cause a voltage drop
across its input.
When designing your loop, add up all voltage losses across the devices connected to the
loop and add 12 V. The sum will be the minimum supply voltage required from the power
supply. Calculate with a 20% safety factor.
If a display is used, configure it to the proper range: -90
for dewpoint corresponding to 4 to 20 mA.
Installation and Operation Manual
Optional loop powered
display available from
General Eastern, such as Md102
Customers power supply
24 V DC ( 9...32 V DC )
~
Power supply
available from General Eastern
8888
~
Power supply with display
and optional relay available
from General Eastern such as Md102
o
C to +10 oC (- 130 oF to + 50 oF)
115/ 2 30 V
AC
115/230 V
AC
GE General Eastern
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