GE DewPro MMY31 Manuel utilisateur

Trace Moisture Transmitter

DewPro®MMY31

Installation and Operation Manual

GE Infrastructure Sensing

GE General Eastern

DewPro MMY31 Installation and Operation Manual

GE General Eastern 2

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

DewPro MMY31 Installation and Operation Manual

GE General Eastern 3

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

DewPro MMY31 Installation and Operation Manual

GE General Eastern 4

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.

Unpacking

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.

MODEL: MMY31-R 6 A 2 B

9...32 VDC

10124

SERIAL NO:

SUPPLY:

RANGE:

P max: 500 PSIG

GENERAL EASTERN

The Humidity Experts

Fig. 1

Product Structure MMY31

Check Model

Number

Certification/Approvals:

RStandard (not certified)

YOther

Process Connection

13" diameter galvanized floor flange with 12,7 mm (1/2” MNPT)

compression fitting

31/2" M NPT compression fitting

6No mounting hardware

8G 1/2 compression fitting (Male thread), gasket, SS ferrule

9Other

Protective Cap:

AStandard with 100 micron sintered filter

BWithout 100 u filter

Enclosure Conduit:

11/2" FNPT with cable gland and plug

2PG 16 (Female) with cable gland and plug

Output Configuration/Dewpoint Range:

AOutput 4-20 mA -90 … +10 oC dewpoint, no display, fault

status 22 mA

BOutput 4-20 mA -90 … +10 oC dewpoint, no display, fault

status Hold

COutput 4-20 mA -90 … +10 oC dewpoint, no display,

fault status 3,6 mA

DOutput 0 … 100 ppm-v, 1 bar, no displ, error 22 mA

EOutput 0 … 100 ppm-v, 1 bar, no displ, error Hold

FOutput 0 … 100 ppm-v, 1 bar, no displ, error 3,6 mA

GWith integral display, user interface; free programmable

R 6 A 1 B

DewPro MMY31 Installation and Operation Manual

GE General Eastern 5

1.2 Introduction

Unit descrip-

tion

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 oC or oF.

Fig. 2

MODEL:

9...32 VDC

PSIG

SERIAL NO:

SUPPLY:

DEWPOINT RANGE:

P max:

MMR 31

116

279

168

12,7

Thread

G ½

Compression fitting

50,8 mm

(2,0”)

74,6 mm

(3,0”)

1.3 Theory of Operation

4 to 20 mA

Loop

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 oC to +10 oC (-130 oF to +50 oF).

Planar Sensor

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.

Calibration Each DewPro is factory calibrated against precise NIST certified moisture references and

has an accuracy of +/- 2 oC 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.

DewPro MMY31 Installation and Operation Manual

GE General Eastern 6

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 one-

half turns.

• Now the fitting is tight and can withstand pressure to 17 bar (250 psi)

(provided a stainless steel ferrule is used)

MODEL:

9...32 VDC

PSIG

SERIAL NO:

SUPPLY:

DEWPOINT RANGE:

P max:

MMR 31

Minimum 25mm

GENERAL EASTERN

TheHumidity Experts

Fig. 3

DewPro MMY31 Installation and Operation Manual

GE General Eastern 7

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

GENERA L EASTE RN

TheHumidityExperts

8888

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

115/230 V

Power supply with display

and optional relay available

from General Eastern such as Md102

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 loop-

powered 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 oC to +10 oC (- 130 oF to + 50 oF)

for dewpoint corresponding to 4 to 20 mA.

DewPro MMY31 Installation and Operation Manual

GE General Eastern 8

3.3 Mounting in Normal Environment

• A standard two-wire, stranded cable can be used to interconnect the

DewPro with the power source

Standard

AST

The H u m id i ty E

erts

Shielded Two

wire Cable

External Ground

Capped

off

Fig. 5

3.4 Mounting in Environments with Severe Electrical Noise

• In areas where EMI/RFI interference is likely, a shielded signal cable is to

be used for full protection. The DewPro MMY31 meets requirements of IEC

801-1 through 6 (EN 50081-1, 50082-2) when properly shielded cable is

used

EMI/RFI

Shielded Two

wire Cable

Fasten Shield Under

Cable Clamp for

Maximum RFI Protection

External Ground

Capped

off

TheH umidit

erts

Fig. 6

3.5 Electrical Connection

GENERALEASTERN

TheHumidityExperts

24 V DC Nominal (9-32 V)

Electrical Connec-

tion

Fig. 7

DewPro MMY31 Installation and Operation Manual

GE General Eastern 9

3.6 General Wiring Instructions

1. Unscrew the cap on top of the unit.

2. Loosen the gray cable gland located on the side of the unit.

3. Feed the cable through the conduit opening.

NOTE: Use a standard signal cable size.

4. Retighten the gray cable gland to meet IP 67 and to relieve the wire and protect the

electronics from dust and moisture.

5. Supply 9 to 32 V DC power to the terminals marked + and -.

NOTE: This is the voltage that appears across the DewPro terminals. It is not

necessarily the supply voltage due to voltage loss in wire length, displays,

indicators, etc.

6. If the enclosure is ordered with a ½” FNPT conduit conection, the cable gland can be

removed to connect the conduit.

DewPro MMY31 Installation and Operation Manual

GE General Eastern 10

4.0 Optional Display/User Interface

4.1 Installation

If the DewPro is equipped with an optional display / user interface follow the

procedure below to access the terminals prior to applying power. Please use Figure

18 below as a reference when removing any parts from the DewPro.

GENERALEASTERN

TheHumidityExperts

Fig. 18

1. Unscrew and remove the protective lid from the top of the DewPro, exposing

the display module below

2. Unplug the display from the lower terminal board.

3. Carefully grasp the display bracket and pull straight up.

4. Follow the procedure outlined in Section 3.0, pages 8-10.

5. To replace the display module, locate the six holes on the underside of the

display bracket. The MMY 31 uses the holes with the additional markings

next to them.

6. Align the display bracket with the standoffs and snap the display bracket

onto the three standoffs.

7. Carefully rotate the display module on the display bracket until properly

aligned for readability.

8. Reconnect the display to the lower terminal board observing the key on the

plug and socket.

NOTE: When the display module is installed it takes over control, superseding the

rotary switch functions illustrated under Section 5.4 on page 16. Only the calibration

buttons on the printed circuit board remain active.

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