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GE |
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Measurement & Control |
Moisture |
DewPro® MMR31
Installation & Operation Manual
A40251532 Rev. B
May 2015
DewPro® MMR31
Moisture Transmitter (Mid-Range, 1 or 2 Current Loops)
Installation & Operation Manual
A40251532 Rev. B
May 2015
gemeasurement.com
©2015 General Electric Company. All rights reserved. Technical content subject to change without notice.
[no content intended for this page]
ii
Preface
Information Paragraphs
Note: These paragraphs provide information that provides a deeper understanding of the situation, but is not essential to the proper completion of the instructions.
IMPORTANT:These paragraphs provide information that emphasizes instructions that are essential to proper setup of the equipment. Failure to follow these instructions carefully may cause unreliable performance.
CAUTION! This symbol indicates a risk of potential minor personal injury and/or severe damage to the equipment, unless these instructions are followed carefully.
WARNING! This symbol indicates a risk of potential serious personal injury, unless these instructions are followed carefully.
Safety Issues
WARNING! It is the responsibility of the user to make sure all local, county, state and national codes, regulations, rules and laws related to safety and safe operating conditions are met for each installation. The safety of any system incorporating the equipment is the responsibility of the assembler of the system.
Auxiliary Equipment
Local Safety Standards
The user must make sure that he operates all auxiliary equipment in accordance with local codes, standards, regulations, or laws applicable to safety.
Working Area
WARNING! Auxiliary equipment may have both manual and automatic modes of operation. As equipment can move suddenly and without warning, do not enter the work cell of this equipment during automatic operation, and do not enter the work envelope of this equipment during manual operation. If you do, serious injury can result.
WARNING! Make sure that power to the auxiliary equipment is turned OFF and locked out before you perform maintenance procedures on the equipment.
WARNING! It is the responsibility of the user to make sure the PWR, Hart, Modbus and I/O cable can meet the cable specification, which is described in Appendix A.
DewPro® MMR31 Installation & Operation Manual |
iii |
Preface
Qualification of Personnel
Make sure that all personnel have manufacturer-approved training applicable to the auxiliary equipment.
Personal Safety Equipment
Make sure that operators and maintenance personnel have all safety equipment applicable to the auxiliary equipment. Examples include safety glasses, protective headgear, safety shoes, etc.
Unauthorized Operation
Make sure that unauthorized personnel cannot gain access to the operation of the equipment.
Environmental Compliance
Waste Electrical and Electronic Equipment (WEEE) Directive
GE Measurement & Control is an active participant in Europe’s Waste Electrical and Electronic Equipment (WEEE) take-back initiative, directive 2012/19/EU.
The equipment that you bought has required the extraction and use of natural resources for its production. It may contain hazardous substances that could impact health and the environment.
In order to avoid the dissemination of those substances in our environment and to diminish the pressure on the natural resources, we encourage you to use the appropriate take-back systems. Those systems will reuse or recycle most of the materials of your end life equipment in a sound way.
The crossed-out wheeled bin symbol invites you to use those systems.
If you need more information on the collection, reuse and recycling systems, please contact your local or regional waste administration.
Visit https://www.gemeasurement.com/environmental-health-safety-ehs for take-back instructions and more information about this initiative.
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DewPro® MMR31 Installation & Operation Manual |
Contents
Chapter 1. General Information
1.1 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Version Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.1 First 4-20 mA Loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.2 Second 4–20 mA Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.3 Polymer Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.4 Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chapter 2. Installation
2.1 Mounting the MMR31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1.1 Using a Compression Fitting or a Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1.2 Using a Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Wiring Configurations with One Current Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.1 General Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.2 Normal Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.3 Environments with Severe Electrical Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.4 General Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Wiring Configurations with Two Current Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3.1 General Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3.2 Normal Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3.3 Environments with Severe Electrical Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3.4 General Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 Selecting the Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter 3. Calibration and Troubleshooting
3.1 Calibration Using Two Saturated Salt Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 Calibration Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.2.1 Calibrating the Low RH Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.2.2 Calibrating the High RH Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3.1 Loop Current is Out of Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3.2 No Loop Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3.3 Slow Response Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3.4 Frozen Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DewPro® MMR31 Installation & Operation Manual |
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Contents
Chapter 4. Optional Display/User Interface
4.1 Accessing the Programming Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 4.1.1 Removing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 4.2 Programming the Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.3 Matrix Buttons - Special Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.3.1 Reset to “Normal” Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.3.2 Display Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.3.3 Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.4 Matrix Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.4.1 System Administration Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 4.4.2 Moisture Measurement Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 4.4.3 4-20 mA Output Range Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 4.4.4 Temperature Measurement Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 4.4.5 Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Chapter 5. Specifications
5.1 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 5.2 Optional Onboard Display with User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 5.3 EMI/RFI Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 5.4 EMC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 5.5 Available Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
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DewPro® MMR31 Installation & Operation Manual |
Chapter 1. General Information
Chapter 1. General Information
1.1Unpacking and Inspection
Upon receipt of the DewPro MMR31, examine the shipping carton for broken or open packing, distortion, or any other evidence of mishandling. If your inspection indicates damage to the unit or any of its components may have occurred, notify the carrier within 15 days of delivery and request an inspection.
If no shipping damage is suspected, move the carton to a clean work area and unpack the contents. The carton you received should contain:
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DewPro MMR31 Instrument
Installation and Operation Manual
Calibration Certificate
1.2Model Number
Locate the product label on your MMR31, and compare the last five characters of the model number with the product numbering structure shown on the next page. This will confirm that your MMR31 has been configured to your specifications. In the example shown in Figure 1 below, the characters R8A2A indicate: standard certification (not certified), G1/2 compression fitting (male thread) with gasket and SS ferrule, protective cap with standard
100 micron sintered filter, enclosure conduit M20 x 1.5-F with 1/2” NPT-F adapter and plug, and one selectable 4-20 mA output (RH 0-100% or dew point –15°C to +85°C, absolute humidity, mixing ratio, no display,
fault status 22 mA).
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GE Sensing |
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1100 Technology Park Dr. |
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Billerica, MA 01821 USA |
Model: |
MMR31 - R8A2A |
S/N: |
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Supply: |
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Range: |
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Pressure Rating: |
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Figure 1: DewPro MMR31 Product Label |
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DewPro® MMR31 Installation & Operation Manual |
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Chapter 1. General Information
1.2Model Number (cont.)
1 |
2 |
3 |
4 |
5 |
MMR31 –
1 - Certification
R. Standard Certification (not certified)
S. Other
2 - Process Connection
1. 3” diameter galvanized floor flange with 12.7 mm (½” NPT-M) compression fitting 2. 3/4” NPT-M compression fitting
3. 1/2” NPT-M compression fitting
4. 3/4” x 16 “O” ring compression fitting (UNF thread) 6. No mounting hardware
8. G1/2 compression fitting (Male thread), gasket, SS ferrule S. Other
3 - Protective Cap
A. Standard, with 100 micron sintered filter
S. Other
4 - Enclosure Conduit
1. Enclosure Conduit M20 x 1.5-F with cable gland and plug
2. Enclosure Conduit M20 x 1.5-F with 1/2” FNPT adapter and plug S. Other
5 - Output Configuration/Dewpoint Range
A. One output 4-20 mA selectable: RH 0-100% or dewpoint 15 to +85°C (5 to 185°F), absolute humidity, mixing ratio, no display, fault status 22 mA
B. Two 4-20 mA DC output loops: 1st loop Moisture, 2nd loop temperature –15 to +85°C (5 to 185°F), no display, fault status 22 mA
C. As A, fault status hold D. As A, fault status 3.6 mA E. As B, fault status hold
F. As B, fault status 3.6 mA
G. As A, with integral display, user interface H. As B, with integral display, user interface S. Other
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DewPro® MMR31 Installation & Operation Manual |
Chapter 1. General Information
1.3Version Descriptions
The DewPro MMR31 mid-range moisture transmitter is available in two versions:
•One isolated 4-20 mA current loop: The loop current represents the selected moisture unit (see “Selecting the Units of Measure” on page 14).
•Two isolated 4-20 mA loops: The second loop current represents temperature. A unique patented feature of this version is that both loops can be powered by a single supply.
The MMR31 transmitter includes:
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Sensor element
Stainless steel probe
Weather-proof enclosure
Microprocessor electronics
It is designed to be inserted directly into the process. Various mounting hardware, such as flange and compression fittings are available for mounting into a duct, process chamber, wall, etc. The DewPro MMR31 measures relative
humidity in %, dew point temperature in °F or °C, absolute humidity in g/m3, or mixing ratio in g/kg. An optional display with user interface allows the user to configure the MMR31 (see Chapter 4, “Optional Display/User Interface” on page 19).
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Chapter 1. General Information
1.4Theory of Operation
1.4.1 First 4-20 mA Loop
The MMR31 microcontroller-operated electronics operates 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 to 20 mA loop current and is directly proportional to 0 to 100% relative humidity, or, if selected, the dew point temperature range of
5 to 185°F (-15 to +85°C), the absolute humidity in a range of 1 to 350 g/m3, or the mixing ratio in a range of 1 to 830 g/kg.
1.4.2 Second 4–20 mA Loop
The specifications for the first loop current are also valid for the second loop current, except that the 4 to 20mA signal always corresponds to the temperature range of 5 to 185°F (-15 to +85°C).
1.4.3 Polymer Sensor
The sensing element in the MMR31 is a silicon-based polymer that uses the capacitance principle for the moisture measurement. The IC chip includes the moisture sensor and appropriate integrated circuitry. A platinum RTD temperature sensor is built in to provide temperature compensation for maximum accuracy. The sensor element is protected from condensation using a hydrophobic sintered filter. An additional removable filter cap serves as a pre-filter.
1.4.4 Calibration
Each MMR31 is factory-calibrated against precise NIST certified moisture references. Field calibration is possible with the use of saturated salt solutions (refer to Chapter 3, “Calibration and Troubleshooting” on page 15).
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DewPro® MMR31 Installation & Operation Manual |
Chapter 2. Installation
Chapter 2. Installation
To properly install your MMR31, carefully follow the instructions in this chapter.
2.1Mounting the MMR31
To select a suitable mounting location, refer to the dimensions shown in Figure 2 below.
5.43 [138] (w/display) |
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4.49 [114] (wo/display) |
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NOTE: Dimensions are inches [mm] |
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4.25 [108] |
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0.79 [20] |
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11.50 [292] |
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Thread |
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(G1/2, 1/2" NPT-M, etc.) |
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2.00 [50.8] |
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Ø3.00 [76.2] |
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0.50 [12.7] |
Compression Fitting |
Figure 2: MMR31 and Compression Fitting Dimensions |
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DewPro® MMR31 Installation & Operation Manual |
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Chapter 2. Installation
2.1.1 Using a Compression Fitting or a Flange
IMPORTANT: Be certain that the tip of the probe does not touch the inside wall of the pipe or container.
IMPORTANT: A 1.4571 stainless steel ferrule is required for use in pressurized systems. Ensure that your probe has the appropriate fitting for your application.
To monitor moisture inside a pipe or container, mount the probe using a compression fitting connection or a flange (see Figure 3 below). Adjust the ferrule for a probe insertion length of at least 1 in. (25 mm) and tighten the compression fitting as follows:
1.Hand-tighten the nut.
2.Use a wrench to tighten the nut 1-1/2 turns. When tightened in this manner, the fitting with a stainless steel ferrule can withstand pressures up to 17 bar (250 psi).
Min. 1 in. (25 mm)
Figure 3: Mounting the Probe in a Pipe
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DewPro® MMR31 Installation & Operation Manual |
Chapter 2. Installation
2.1.2 Using a Bracket
The MMR31 can be used to monitor the air in a room or other such area, by using the available mounting kits shown in
Figure 4 below.
Panel Mounting 4.45 in. 4.45 in. Vertical Pipe Mounting
(113 mm) |
(113 mm) |
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6.50 in.
(165 mm)
2.76 in.
(70 mm)
3.23 in.
(82 mm)
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0.79 in. |
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(20 mm) |
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4.45 in. |
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2.76 in. |
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(113 mm) |
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(70 mm) |
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Horizontal Pipe Mounting |
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Horizontal Pipe Mounting |
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Figure 4: Mounting Kit Configurations
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