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Summary of Contents for Michell Instruments MDM300 I.S
- Page 1 MDM300 I.S. Advanced Dew-Point Hygrometer User’s Manual 97213 Issue 5 October 2017...
- Page 2 Please fi ll out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Hygrometer Code Serial Number Invoice Date Location of Instrument Tag No Hygrometer Code Serial Number Invoice Date...
- Page 3 © 2017 Michell Instruments This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd.
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Page 4: Table Of Contents
Safety ........................ 9 Unpacking the Instrument ................... 9 MDM300 I.S. Accessories .................. 10 Operational Requirements ................. 12 2.4.1 Environmental Requirements – MDM300 I.S. Instrument ........ 12 2.4.2 Charger Electrical Requirements ..............12 Instrument Gas Connections ................12 2.5.1 Gas Inlet /Outlet Fittings ................13 Connect External Sensors .................. - Page 5 MDM300 I.S. User’s Manual Guide to Measurement and Sampling ..............33 3.6.1 Measuring at Atmospheric or System Pressure ..........34 3.6.2 Measurement Guide ..................35 3.6.3 Conditional Sensor Purge ................37 Battery Management ..................37 3.7.1 Battery Troubleshooting ................37 GOOD MEASUREMENT PRACTICE ..............38...
- Page 6 Dimensions - MDM300 I.S.................49 Figure 36 Current Datalog File Display ..............51 Figure 37 MDM300 I.S. Status Register ..............51 Figure 38 MDM300 I.S. Status Register (Hex 28) ............51 Tables Table 1 Controls and Indicators ................4 Table 2 Instrument Display Descriptions ..............6 Table 3 Adaptor Fittings ..................
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Page 7: Safety
Michell Instruments’ worldwide offi ces contact information. Calibration The recommended calibration interval for the MDM300 I.S. is 12 months. The instrument should be returned to the manufacturer, Michell Instruments Ltd., or one of their accredited service agents for re-calibration. -
Page 8: Abbreviations
MDM300 I.S. User’s Manual Abbreviations The following abbreviations are used in this manual: alternating current pressure unit (atmosphere) barg pressure unit (=100 kP or 0.987 atm) gauge bara bar absolute °C degrees Celsius °F degrees Fahrenheit Kelvin (absolute temperature) common... -
Page 9: Introduction
The MDM300 I.S. is fitted with an internally mounted ceramic sensor, which is enhanced for a quicker response to dew points as dry as -75°Cdp (-103°Fdp). The MDM300 I.S. can also be used to read the dew-point signal from a Michell Instruments’ Easidew I.S. transmitter. To do this, the MDM300 I.S. Remote Sensor Interface is used to connect to the Easidew I.S. -
Page 10: Figure 1 Mdm300 I.s. Advanced Dew-Point Hygrometer
Two versions of the instrument are available, an MDM300 (standard) version and an MDM300 I.S. (intrinsically safe) version. This manual covers the MDM300 I.S. version only. For information about the MDM300 contact your local Michell Instruments’ representative (contact information at www.michell.com). MDM300 I.S. Advanced Dew-Point Hygrometer... -
Page 11: Controls And Indicators
MDM300 I.S. User’s Manual INTRODUCTION Controls and Indicators The controls and indicators associated with the MDM300 I.S. instrument are located on the front panel of the instrument. Connections to the MDM300 I.S. dew-point hygrometer, comprising the gas ports, battery charger input connector and input connector for the external sensor are all made to the top panel. -
Page 12: Table 1 Controls And Indicators
MDM300 I.S. User’s Manual INTRODUCTION Item Panel Description Function keys. Refer to Section 1.2 for the details of these Front keys. Instrument display, partitioned to show 3 main panels: The primary display shows internal sensor parameters. The secondary display indicates the external sensor Front parameter. -
Page 13: Function Keys
MDM300 I.S. User’s Manual INTRODUCTION Function Keys The function keys, located on the front panel, are used to select operations from the menus and to select and enter parameter variables within those menu levels. The function key described is shaded darker and the operation of the keys is as follows: 1.2.1... -
Page 14: Instrument Display
MDM300 I.S. User’s Manual INTRODUCTION Instrument Display The graphics display and the associated function keypad ( Figure 2), form the operator interface of the equipment. Figure 3 shows all the elements of a typical display page after the instrument’s initialization period has completed. -
Page 15: Display Units
MDM300 I.S. User’s Manual INTRODUCTION 1.3.1 Display Units The instrument can display the measured reading in the following units: Absolute Humidity • lb/MMscf • • Moisture Content • ppmV NG • ppmV • ppmW (AIR, USER, H , SF , CO... -
Page 16: Status Display Indications
MDM300 I.S. User’s Manual INTRODUCTION 1.3.2 Status Display Indications ‘ Initializing Internal Sensor’ This is displayed immediately after the instrument has been powered up, and indicates that the sensor is being heated up to accelerate equilibrium with the moisture in the sample gas. -
Page 17: Installation
It is essential that the installation of the electrical and gas supplies to this instrument be undertaken by qualifi ed personnel. Unpacking the Instrument The MDM300 I.S. instrument is packed into a standard box and the method of unpacking is shown below: Packing Method Figure 4 Open the box (1) and unpack carefully. -
Page 18: Mdm300 I.s. Accessories
INSTALLATION MDM300 I.S. Accessories The accessories for the MDM300 I.S. are shown in Figure 6 . Items 1 to 7 are supplied as standard and item 8 is optional. Please check that all the standard components are present after unpacking. Report any shortages immediately. -
Page 19: Figure 6 Accessories
MDM300 I.S. User’s Manual INSTALLATION MDM300 & MDM300 I.S. Quick Start Guide Connect the MDM to the sample gas stream Determine the approximate Typical MDM300 Sampling Arrangement dew point by using the ‘initial check’ procedure on the reverse SAMPLE FLOW... -
Page 20: Operational Requirements
Figure 5 . The MDM300 I.S. is supplied with a large bore orifice fitting installed into the Gas In and Gas Out ports. These fittings have an 1/8” NPT female thread to allow the user to connect other components of their choice. -
Page 21: Gas Inlet /Outlet Fittings
Michell Instruments, on request. NOTE: The bonded seals used for the MDM300 I.S. are Dowty part number 400-228-4490-74 (from Michell Instruments, part number MDM300-DS). -
Page 22: Connect External Sensors
The MDM300 I.S. Remote Sensor Interface is a passive device. The combined terminal parameters of the MDM300 I.S. and of the barrier used with the Easidew I.S. system must not exceed the input terminal parameters of the Easidew I.S. as specified in the System Drawing (System Certificate No. -
Page 23: Set Up External Sensor Interface
2.6.2 Entering User Pressure The MDM300 I.S. can be programmed with a pressure to be used in the calculation of atmospheric equivalent or pressure dew point, moisture content or absolute humidity. NOTE: Care should be taken to ensure that the entered pressure is correct as it may have a considerable effect on the measurement. -
Page 24: Battery Charging
Figure 12 Battery Charger Connection Connect an AC power supply, 100 to 240 V AC, 50/60 Hz, to the battery charger unit. NOTE: The MDM300 I.S. instrument does not need to be switched on in order to charge the battery. - Page 25 If the battery has been damaged then the charger will not begin the fast-charge stage. Please contact Michell Instruments’ service department for advice. Once the charger has finished the fast-charge stage it can be safely disconnected. Switch off the AC power supply, remove the charger unit and close the instrument’s charge connector protection cover.
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Page 26: Operation
Preparation for Operation The MDM300 I.S. has a user-friendly system of operation. Before operation it is recommended that the user becomes familiar with Section 1 of this manual in which the equipment controls and indicators, and the elements of the display are described. -
Page 27: Instrument Start-Up
MDM300 I.S. User’s Manual OPERATION Instrument Start-Up At switch on, the instrument goes through an initialization process of between 4 and 7 minutes, MDM300 I.S. depending sensor sample System Initializing characteristics. During this time the internal sensor is heated to a maximum of +60°C (+140°F). The heating... -
Page 28: Overall Menu Structure And Operation
MDM300 I.S. User’s Manual OPERATION Overall Menu Structure and Operation 3.3.1 SET-UP Menu All instrument settings are made from the SET-UP Menu which is accessible from the Main Display by pressing the key. Enter On the first occasion after switch-on the Passcode Entry page will be displayed. Enter... -
Page 29: Figure 14 Menu Structure
MDM300 I.S. User’s Manual OPERATION Scroll Unit Files Page to view Chart Page Main Display (Primary, (only if internal sensor LOGGING? Secondary and Status Windows) available) Logs Page PASSCODE FOR SETUP (on start-up only) =7316 Scroll to Adjust Digit Chart Reset Page... -
Page 30: Set-Up Menu Parameters
MDM300 I.S. User’s Manual OPERATION SET-UP Menu Parameters Follow the instructions in Section 3.3.1 to select the required parameters. 3.4.1 SETTINGS PRIMARY DP AT ATMOS SETTINGS DP/TEMP UNIT °C PRESSURE UNIT Psig GAS TYPE MOL WEIGHT CHART INTERVAL Figure 15 SETTINGS Page... -
Page 31: Logging
MDM300 I.S. User’s Manual OPERATION 3.4.2 LOGGING Logging can be set up either from the SETTINGS Menu or from the Chart Page (see Section 3.4.8). Both methods of entry lead to the same LOGGING SET-UP menu as shown below: >... -
Page 32: Bluetooth
3.4.3 BLUETOOTH Bluetooth mode is used, in conjunction with a dedicated MDM300 I.S. application software package, for the purpose of uploading datalog files to a PC using a wireless connection. Within the PC the dedicated Michell application software package is used to upload the files to the PC’s desktop, from where they can be loaded into other programs, e.g. -
Page 33: 3.4.3.1 Bluetooth Pairing Procedure
MDM300. Double click the instrument icon and enter the instrument’s pairing passcode ( ) for all MDM300 I.S. instruments. NOTE: Each digit 7316 will be shown only briefly as it is entered and then hidden. When all digits have been entered click... -
Page 34: External (Sensor Interface)
MDM300 I.S. User’s Manual OPERATION 3.4.4 EXTERNAL (Sensor Interface) The MDM300 I.S. is designed to be connected ONLY to a Michell Instruments’ remotely mounted Easidew I.S. or Easidew PRO I.S. transmitter. Connection to any other type of sensor could impair safety. -
Page 35: Clock
MDM300 I.S. User’s Manual OPERATION 3.4.5 CLOCK YEAR CLOCK MONTH HOUR Figure 20 CLOCK Page Parameter Description Current year YEAR Available Input: Range: 00 to 99 Current month MONTH Available Input: Range: 01 to 12 Current day Available Input: Range: 01 to 31... -
Page 36: Hmi
MDM300 I.S. User’s Manual OPERATION 3.4.6 CONTRAST BRIGHTNESS KEY TONE BL TIMEOUT LANGUAGE PRIMARY DISP INTERN Figure 21 HMI Page Parameter Description Sets the contrast on the screen. CONTRAST Available Input: Range: in 5% increments 0 to 100% Sets the brightness of the screen. -
Page 37: Info
MDM300 I.S. User’s Manual OPERATION 3.4.7 INFO MDM300 I.S. Portable Hygrometer Firmware 36176 Ver 0.01 Sensor serial number E050-035 Sensor next cal due 03/09/12 Sensor hours used 20 hr www.michell.com Figure 22 INFO Page This page contains system information and no changes can be made. -
Page 38: Log Files Page
Figure 24 LOG FILES Page The content of the datalog files cannot be examined but, by enabling the instrument’s Bluetooth mode, (see Section 3.4.3), the MDM300 I.S. application software may be used to upload the datalog files to a PC. -
Page 39: 3.4.11 Calibration
MDM300 I.S. User’s Manual OPERATION The display shows: Indicates a log number for each set of log points Value of primary display parameter Value of secondary display parameter Status column which reports the status of the instrument at each log point in hexadecimal code. -
Page 40: Default Parameters
Current UK time & date CONTRAST BRIGHTNESS Section 3.4.6, Figure 21 KEYTONE BL TIME-OUT LANGUAGE PRIMARY DISP INTERN CALIBRATION & INFO Section 3.4.11 & Section 6 Default values not applicable Table 10 MDM300 I.S. Default Parameters 97213 Issue 5, October 2017... -
Page 41: Guide To Measurement And Sampling
MDM300 I.S. User’s Manual OPERATION Guide to Measurement and Sampling Operating the MDM300 I.S. is very straightforward, but sampling conditions can vary greatly from one application to another. To get the best possible response speed, the appropriate procedure should be followed. -
Page 42: Measuring At Atmospheric Or System Pressure
MDM300 I.S. User’s Manual OPERATION It is highly recommended that a fi lter is installed upstream of the MDM300. Refer to the Sample Conditioning section of the Sampling Hints found in Section 4.1. 3.6.1 Measuring at Atmospheric or System Pressure... -
Page 43: Measurement Guide
Table 11 MDM300 I.S. Measurement Procedures Standard Purge (Atmospheric Measurement) Connect the MDM300 I.S. to the sample gas stream. Adjust the flow rate, using the inlet flow control valve, to between 0.2 & 0.5 Nl/min (0.5 & 1 scfh). The outlet flow control valve should be fully open. - Page 44 OPERATION Standard Purge (Pressure Measurement) Connect the MDM300 I.S. to the sample gas stream. Adjust the flow rate, using the outlet flow control valve, to between 0.2 & 0.5 Nl/min (0.5 & 1 scfh). The inlet flow control valve should be fully open.
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Page 45: Conditional Sensor Purge
15 seconds or the battery may be damaged. NOTE: Michell Instruments will replace the older FW 7219 charger with the new Cell Con model free of charge. The Cell Con will re-charge batteries which have completely discharged. -
Page 46: Good Measurement Practice
GOOD MEASUREMENT PRACTICE GOOD MEASUREMENT PRACTICE The MDM300 I.S. is designed to operate in a flowing gas stream with flow rates between 0.2 and 0.5 Nl/min (0.5 and 1 scfh). Flow regulation is provided with the MDM300 I.S. instrument between 2.5 and 10 barg. Outside of this, the sample flow must be regulated outside the unit. -
Page 47: Sampling Hints
MDM300 I.S. User’s Manual GOOD MEASUREMENT PRACTICE Sampling Hints Measurement of moisture content is a complex subject, but does not need to be difficult. This section aims to explain the common mistakes made in measurement situations, the causes of the problem, and how to avoid them. Mistakes and bad practices can cause the measurement to vary from the expectation;... - Page 48 MDM300 I.S. User’s Manual GOOD MEASUREMENT PRACTICE Sample Tubing Length The sample point should always be as close to the critical measurement point as possible, in order to obtain a truly representative measurement. The length of the sample line to the sensor or instrument should be as short as possible. Interconnection points and valves trap moisture, so using the simplest sampling arrangement possible will reduce the time it takes for the sample system to dry out when purged with dry gas.
- Page 49 Before disconnecting the MDM300 I.S. from the gas line it is essential to vent the system to atmospheric pressure, otherwise severe injury could result.
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Page 50: Application Software
MDM-300-7392 Once the software has been installed and run, the MDM300 I.S. can be linked to the PC by activating the Bluetooth on the MDM300 I.S. and then connecting with the application software (see Section 3.4.3 for details). -
Page 51: Calibration
If these facilities do not exist it is recommended that the instrument be returned to the manufacturer, Michell Instruments Ltd., or one of the approved agents. A calibration certificate bearing a seven point calibration is issued with each instrument. -
Page 52: Calibration Method
Ensure that all sample tubing and connectors are made from stainless steel and are of suitable quality. Connect the MDM300 I.S. to a dew-point generator and establish a gas flow through the instrument. Apply a dew point of -100°C and allow the instrument’s reading to stabilize for a minimum of 96 hours (including dry down). -
Page 53: Calibration Correction Method
-70.0 -60.0 -60.0 Figure 31 Calibration Menu Page The MDM300 I.S. Calibration look-up table is divided into three columns. The values in the first column represent the thirteen nominal calibration points, POINT spread at 10°C intervals over the instruments operating range of -100 to +20°C (-148 to +68°F... -
Page 54: Shipping
Create a packing list detailing all equipment contained in the box, place it inside the box and seal the box. Before disconnecting the MDM300 I.S. from the gas line it is essential to vent the system to atmospheric pressure, otherwise severe injury could result. - Page 55 MDM300 I.S. User’s Manual APPENDIX A Appendix A Technical Specifi cations Michell Instruments...
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Page 56: Appendix A Technical Specifi Cations
MDM300 I.S. User’s Manual APPENDIX A Appendix A Technical Specifi cations Performance Measurement Technology Michell Ceramic Sensor ±1°C from -60 to +20°Cdp (-76 to +68°Fdp) Accuracy ±2°C from -100 to -60°Cdp (-148 to -76°Fdp) ±0.2°C (0.3°F) temperature For Spot Checks -70 to +20°Cdp (-95 to +68°Fdp) -
Page 57: Dimensions
Certifi cation Codes TC TR Ex 0Ex ia IIC T4 Ga Class I, Division 1, Groups A B C D, T4 Class I, Division 1, Groups A B C D, T4 Dimensions Figure 35 Dimensions - MDM300 I.S. Michell Instruments... - Page 58 MDM300 I.S. User’s Manual APPENDIX B Appendix B Datalog Status Display 97213 Issue 5, October 2017...
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Page 59: Appendix B Datalog Status Display
Figure 36 . Bit 1 is the least significant bit. The four most significant bits 13 to 16 are for Michell Instruments’ service use and so the first character in any MDM300 I.S. ST display will always read 0. -
Page 60: Table 13 Status Register Flags
MDM300 I.S. User’s Manual APPENDIX B Table 13 shows the status flags associated with each bit of the status register. If a status flag is set high then the associated condition exists. If it is set low, then that condition does not exist. - Page 61 MDM300 I.S. User’s Manual APPENDIX C Appendix C Hazardous Area Certifi cation Michell Instruments...
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Page 62: Appendix C Hazardous Area Certifi Cation
APPENDIX C Appendix C Hazardous Area Certifi cation The MDM300 I.S is certified compliant to the ATEX Directive (2014/34/EU) and IECEx for use within Zone 0 Hazardous Area, and has been assessed so by Baseefa Ltd (Notified Body 1180). The MDM300 I.S is certified compliant to North American Standards (USA and Canada) for use within Class I, Division 1, Groups A, B, C &... -
Page 63: Special Conditions Of Use
None Maintenance and Installation The MDM300 I.S. must only be installed by suitably qualified personnel and in accordance with the instructions provided and the terms of the applicable product certificates. Maintenance and servicing of the product must only be carried out by suitably trained personnel or returned to an approved Michell Instruments’... - Page 64 MDM300 I.S. User’s Manual APPENDIX D Appendix D FCC Declaration 97213 Issue 5, October 2017...
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Page 65: Appendix Dfcc Declaration
APPENDIX D Appendix D FCC Declaration MDM300 I.S. Advanced Dewpoint Hygrometer. This Device complies with FCC Rules Part 15 Subpart B Unintentional Radiators Class B digital devices. Operation is subject to the following conditions: 1) This device may not cause harmful interference 2) This device must accept any interference received, including interference that may cause undesired operation. - Page 66 MDM300 I.S. User’s Manual APPENDIX E Appendix E Quality, Recycling & Warranty Information 97213 Issue 5, October 2017...
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Page 67: Appendix E Quality, Recycling & Warranty Information
MDM300 I.S. User’s Manual APPENDIX E Appendix E Quality, Recycling & Warranty Information Michell Instruments is dedicated to complying to all relevant legislation and directives. Full information can be found on our website at: www.michell.com/compliance This page contains information on the following directives: •... - Page 68 APPENDIX F MDM300 I.S. User’s Manual Appendix F Return Document & Decontamination Declaration 97213 Issue 5, October 2017...
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Page 69: Appendix F Return Document & Decontamination Declaration
Has the equipment been cleaned and decontaminated? NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous Work will not be carried out on any unit that does not have a completed decontamination declaration. - Page 70 MDM300 I.S. User’s Manual NOTES: 97213 Issue 5, October 2017...
- Page 72 http://www.michell.com...
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