GE Sensing MMY30 Operating Manual
Trace moisture Transmitter for
pressure or atmospheric dewpoint
®
DewPro
MMY30
Installation and Operation Manual
GE Measurement & Sensing Technologies
GE General Eastern
DewPro MMY30
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.
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
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 General Eastern.
DewPro is a Registered Trademark of 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
Installation and Operation Manual
GE General Eastern
2
DewPro MMY30
Installation and Operation Manual
Contents
General Notes 2
1.0 General System Information …………………………. 5
1.1 Unpacking and Inspection 5
1.2 Introduction 6
1.3 Theory of Operation 6
1.4 Dimensions 7
2.0 Installation Guidelines …………………..……………. 7
2.1 General Hints 7
2.2 Method 1 - Orifice at Outlet 8
2.3 Method 11 - Orifice at Inlet 9
2.4 Method Ill - No Flow Restriction 9
2.5 Method IV - Bypass Installation 10
3.0 Wiring Instructions …………………………………... 11
3.1 Wiring, General Guidelines 11
3.2 System Configuration 11
3.3 Mounting in Normal Environments 12
3.4 Mounting in Environments with Severe Electrical Noise 12
3.5 Electrical Connection 12
3 6 General Wiring Instructions 13
4.0 Optional Display/User Interface……………………… 14
4.1 Installation 14
4.2 Description of the DewPro MMY 30 Programming Matrix 15
4.3 Special Functions of the Pushbuttons 16
4.4 Functions of the Matrix (Refer to Figure 20 or appendix) 16
GE General Eastern
3
DewPro MMY30
Installation and Operation Manual
5.0 Troubleshooting 21
5.1 General Recommendations 21
5.2 Removing the Filter 21
6.0 Technical Specifications 23
6.1 Optional Onboard Display with User Interface 23
7.0 Accessories 24
7.1 Available Accessories 24
7.2 Example of Power Supplies and Displays23 24
Appendix
GE General Eastern
4
DewPro MMY30
Installation and Operation Manual
1.0 General System Information
1. 1 Unpacking and Inspection
Upon receipt of the DewPro MMY 30, 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 30
• Installation and Operation Manual
• Calibration Certificate
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
MMY30 -
Certification/Approvals:
R Standard (not certified)
Other
Y
Process Connection:
2
1 ½” MNPT (1/4” tube fitting if B, C or D is selected below)
G ½ (6 mm tube fitting if B, C or D is selected below)
9 Other
Orifice Configuration:
A
D
Inlet: None; Outlet: Orifice, with ¼” FNPT
B Inlet: None; Outlet: Orifice, with (6 mm) ¼ " tube fitting
C Inlet: None; Outlet: None, with (6 mm) ¼ " tube fitting
Inlet: Orifice; Outlet: None, with (6 mm) ¼ " tube fitting
Y Other
Enclosure Conduit:
1
½ " FNPT
2 PG 16
9 Other
Output Configuration/Dewpoint Range:
A Td -90 oC to +10 oC (-130 oF to +50 oF), no display, error
22 mA
B
Td -90 oC to +10 oC (-130 oF to +50 oF), no display, error
Hold
C Td -90 oC to +10 oC (- 130 oF to +50 oF), no display,
error 3.6 mA
F
D 0-100 ppmv 1 bar, no display, error 22 mA
E 0-100 ppmv 1 bar, no display, error Hold
0-100 ppmv 1 bar, no display, error 3.6 mA
G With integral display/user interface
Y Other
R 2 A 2 A
The Humidity Experts
MMY30-R-2-A-2-A
10124
9...32 VDC
Unpacking
Check Model
Number
Fig. 1
GE General Eastern
5
DewPro MMY30
Installation and Operation Manual
1.2 Introduction
Unit description
The DewPro MMY 30 trace moisture transmitter is a loop-powered dewpoint
measuring device. The transmitter includes a sensor element, a flow chamber, a
weather-proof enclosure, microprocessor electronics, and assorted fittings all in a
compact assembly In most cases, either the inlet or outlet port includes an orifice to
regulate the flow. The placement of this orifice determines whether the dewpoint
measurement is done at process (line) pressure (outlet orifice), or at atmospheric
pressure (inlet orifice). A 2 micron sintered inlet filter prevents particles from entering
the device.
Optional
Display/User
The optional display/user interface feature allows the DewPro to be configured to the
user's specifications. See Chapter 4.0, pages 14-20 for more information.
Interface
Power Signal
Cable Entry
Electronics Housing
Outlet
(Exhaust)
Fitting
Flow Cell
SensorElement
Fig. 2
Sinterfilter
Inlet (Process
Connection)
1.3 Theory of Operation
4 to 20 mA
Loop
By-pass In dryer applications, the moisture sensor performs best when mounted in a bypass. The
Planar Sensor
Calibration Each DewPro is factory calibrated against precise NIST certified moisture references
The DewPro MMY 30 microprocessor controlled electronics operate with a DC voltage
supply from 12 to 32 V DC. At the nominal 24 V DC supply, the maximum loop resistance
is 600 Ohm. The signal is represented by the 4 to 20 mA loop current and is
directly proportional to the dewpoint range in oC or oF In the standard range, 4 mA
corresponds to -90 oC (-130 oF) and 20 mA to +10 oC (+50 oF) dewpoint temperature.
The optional unit of measure is ppmv in the standard range 0 - 100 ppm-v.
built-in bypass of the DewPro eliminates costly hardware associated with traditional
sampling methods. The DewPro installs simply into the process with its G ½ or ½ "
MNPT threaded connection.
The heart of the MMY 30 is the new planar sensor element. It incorporates a new,
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.
and has an accuracy of ñ2 OC dewpoint. For field recalibration, GE General Eastern is
offering a unique calibration device. The MMY145 field calibrator connects to the DewPro
on site and corrects the calibration data automatically.
GE General Eastern
6
DewPro MMY30
Installation and Operation Manual
1.4 Dimensions
Choose a mounting location which allows enough clearance for the use of tools and
for connection of the field calibrator.
116
86
GENE RAL EAS TERN
The Humidity Experts
MMY30
MODEL:
SERIAL NO:
12...32 VDC
SUPPLY:
DEWPOINT RANGE:
P max:
168
83
PSIG
65
1 mm = 0,04 in
.
Standard DewPro
Fig. 3
116
76
220
MODEL:
SERIAL NO:
SUPPLY:
DEWPOINT RANGE:
P max:
GENERAL EASTERN
The Humidit y Expe rts
MMY30
12...32 VD C
PSIG
83
65
1 mm = 0,04 in
.
DewPro with
Optional
Display/User
Interface
Fig. 4
GE General Eastern
7
DewPro MMY30
2.0 Installation Guidelines
2.1 General Hints
• Mount the DewPro vertically whenever possible to prevent particles or
condensation from entering the bypass.
• Mount the DewPro after a shut-off valve to depressurize the DewPro when
removing it from the process pipe in case of maintenance or field calibration.
Caution!
Do Not OverTighten
Caution!
The outlet fitting is connected to the bypass block with a G 114 straight thread
(with gasket) which will seal if the fitting is simply hand-tightened. When
connecting an external device, counter the fitting with a second wrench when
tightening.
If the inlet is equipped with a G 112 straight thread and gasket, the seal is obtained
by simply hand-tightening the DewPro.
2.2 Method I – Orifice at Outlet
Fig. 5
Pressure
Dewpoint
Air Flow
Air dryers producing general instrument air are typically specified with a pressure
dewpoint rating. The majority of dryers operate in a dewpoint range between -40 oC to
-75 oC (-40 oF to -100 oF). A pressure of 7 to 8 bar (= 100 psig) is very common.
The DewPro is designed to measure the pressure dewpoint. By restricting the flow at
the outlet of the integral bypass with an orifice, the sensor monitors the dewpoint at
process pressure. The bleed-off air to the atmosphere at 7 to 8 bar (100 psig),is
approximately 70 cc/min. (=4 [/h or =0. 14 cfh). For smaller sized dryers of 3m'/min.
(=100 cfm) the air loss is only 0.002% of the air production and is negligible.
Despite the very low flow rate through the bypass as shown, the air sample in the
DewPro bypass chamber is refreshed every second due to the small volume design.
As a result, the sensor sees changes in moisture instantaneously.
Due to the low flow rate, the flow velocity is also very low at < 0.01 m/sec. (=34m/h).
The low flow velocity prevents the inlet filter from clogging since there is not enough
kinetic energy to draw dust particles into the filter.
Process Pipe
GENERAL EASTERN
MODEL: MMY30
SERIAL NO:
SUPPLY:
DEWPOINT R ANGE:
P max:
Installation and Operation Manual
G ¼" Straight Thread
The Humidity Experts
12...32 VDC
PSIG
Outlet connection with orifice
Shut-off valve
GE General Eastern
8
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