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Summary of Contents for Michell Instruments Easidew DryCheck
- Page 1 Easidew DryCheck OnLine Dew-Point Hygrometer User’s Manual 97108 Issue 13 July 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. Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument 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
Easidew DryCheck User’s Manual Contents Safety ..........................vi Electrical Safety ......................vi Pressure Safety ......................vi Toxic Materials ......................vi Repair and Maintenance ....................vi Calibration ........................vi Safety Conformity ......................vi Abbreviations ........................vii Warnings ........................... vii INTRODUCTION ....................VIII General ......................viii Features ......................viii INSTALLATION ....................1 Unpacking the Instrument ................... - Page 5 Easidew DryCheck User’s Manual Figures Figure 1 Easidew DryCheck ................... viii Figure 2 Unpacking Method ..................1 Figure 3 Gas Flow Diagram ..................2 Figure 4 Monitor Panel Layout ..................3 Figure 5 Alarm and Communications .................6 Figure 6 Monitor Rear Panel Connections ..............7 Figure 7 Typical Display ...................9...
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Page 6: Safety
Repair and Maintenance The instrument must be maintained either by the manufacturer or an accredited service agent. Refer to www.michell.com for details of Michell Instruments’ worldwide offi ces’ contact information. Calibration The recommended calibration interval for this instrument is 12 months unless it is to be used in a mission-critical application or in a dirty or contaminated environment in which case the calibration interval should be reduced accordingly. -
Page 7: Abbreviations
Easidew DryCheck User’s Manual Abbreviations The following abbreviations are used in this manual: alternating current barg pressure unit (=100 kP or 0.987 atm) °C degrees Celsius °F degrees Fahrenheit dew point Hertz milliampere Nl/min normal liters per minute psig pound(s) per square inch (gauge) -
Page 8: Introduction
-100 to +20°Cdp (-148 to -4°Fdp) / -60 to +60°Cdp (-76 to 140°Fdp) / -50 to +50°Cdp (-58 to 122°Fdp). The Easidew DryCheck is protected within an IP65-rated, wall-mounted enclosure with a hinged lid. The lid allows access to a panel-mounted, process indicator with a °C dew-point display. -
Page 9: Installation
It is essential that the connection of electrical and gas supplies to this instrument be undertaken by competent personnel. The Easidew DryCheck instrument and its accessories are packed into a box and the method of unpacking is shown as follows:... -
Page 10: Drycheck System Configuration
A barometric version is available on request, please contact Michell Instruments (see www.michell.com for contact details). Monitor The controls and indicators associated with the Easidew DryCheck are located on the front panel of the monitor. Connections to the monitor and the external power supply are made to the rear panel of the monitor and are replicated on two terminal blocks. -
Page 11: Monitor Panel Layout
Easidew DryCheck User’s Manual INSTALLATION Two temperature alarm indications are provided by two LEDs located on the right hand side of the display. These are marked (low) and (high). Access to the alarm ALr1 ALr2 relay contacts is provided on the rear panel. The connection for the... -
Page 12: Table 1 Monitor Front Panel Controls And Indicators
Easidew DryCheck User’s Manual INSTALLATION Item Description °Fdp When illuminated, this LED indicates that the displayed dew-point reading is in degrees Fahrenheit. NOTE: If neither the °Fdp or °Cdp LED is lit, ppm is selected. °Cdp When illuminated, this LED indicates that the displayed dew-point reading is in degrees Celsius. -
Page 13: Function Keys
A single-phase mains power supply of 100 to 240 V (-15% / +10%), 50/60 Hz, 6 VA is required to power the Easidew DryCheck. Loosen the 2 screws and remove the access cover at the lower front of the instrument (Figure 5) . -
Page 14: Signal Output Connections
Easidew DryCheck User’s Manual INSTALLATION Signal Output Connections The Easidew DryCheck has 1 signal output Alarm 2 ( ) and the re-transmitted ALr2 input signal (4-20 mA or 0-20 mA current loop signal depending upon instrument configuration). Loosen the 2 screws and remove the access cover at the lower front of the instrument (Figure 5) . -
Page 15: Figure 6 Monitor Rear Panel Connections
Easidew DryCheck User’s Manual INSTALLATION Figure 6 Monitor Rear Panel Connections Re-transmission Output The re-transmission output is current sourcing. Connect the positive output to terminal 14 and the negative output to terminal 13. Use appropriately colored wires eg. red (positive), black (negative). -
Page 16: Operation
General Operational Information Operation of the Easidew DryCheck is completely automatic and, once set-up, requires little or no operator intervention. The dew-point transmitter is designed to operate in a flowing gas stream of between 1 to 5 Nl/min (2.1 to 10.6 scfh) when mounted in a sample block, at operating pressures... -
Page 17: Preparation For Operation
Easidew DryCheck User’s Manual OPERATION Preparation For Operation 3.2.1 First Time Operation To commence operation, proceed as follows: Check that electrical power supply and the relevant analog and alarm outputs are connected to external systems as required and as described in Section 2.8. -
Page 18: System Alarms
System Alarms 3.3.1 Alarm Switching Logic (Default) The Easidew DryCheck has one alarm output. As supplied, the default alarm set-point and the alarm switching logic are as follows (the default temperature units are degrees Celsius): Alarm 2 (High Alarm) is set to switch when the temperature reading is higher (gas wetter) than its set-point value. -
Page 19: Figure 8 Change Alarm Switching Logic
Easidew DryCheck User’s Manual OPERATION Main Display Main Display Figure 8 Change Alarm Switching Logic Michell Instruments... -
Page 20: Alarm Level Set-Up
Easidew DryCheck User’s Manual OPERATION 3.3.3 Alarm Level Set-Up The alarm set-point levels are set-up from the program menu as follows Main display (to exit to the Main Display without saving any new settings press the key): Set x2 Figure 9 shows the operational key sequence. -
Page 21: Re-Transmitted Output Current Range Set-Up
Easidew DryCheck User’s Manual OPERATION 3.3.4 Re-Transmitted Output Current Range Set-Up The Easidew DryCheck is provided with an analog current loop output module which buffers and re-transmits the current loop input signal from the dew-point transmitter. By default, the re-transmission output is set as a 4-20 mA current loop (to exactly follow the input signal, i.e. -
Page 22: Operating Temperature / Ppm Range
Operating Temperature / ppm Range 3.4.1 Temperature Range Default The default temperature unit for the Easidew DryCheck is in degrees Celsius. This is indicated by the °Cdp LED indicator. The default settings associated with this temperature scale are as follows: •... -
Page 23: Span And Unit Settings
Easidew DryCheck User’s Manual OPERATION 3.4.2 Span and Unit Settings To change the span and unit settings, proceed as follows. Figure 11 shows the Main Display (°C) operational key sequence. Press the key once, the display will read tECH Press the... -
Page 24: Alarm Set-Point Limit Configuration
Easidew DryCheck User’s Manual OPERATION 3.4.3 Alarm Set-Point Limit Configuration Main display The following procedure is used to set limits to which the alarm levels can be set (usually after re- configuring the instrument’s range for Fahrenheit readings). Figure 12 shows the operational key sequence. -
Page 25: Scale Units To Ppm
NOTE: The dew-point transmitter must be configured to provide an output proportional to ppmV which can be set up at the time of order or by using the Michell application software. Contact Michell Instruments for information (for contact details see www.michell.com). -
Page 26: Monitor Limits When Unit Scaled To Ppm
Easidew DryCheck User’s Manual OPERATION Main Display, e.g. °C Main Display, ppm(v) Figure 13 Set-up Monitor (to read ppm 3.4.5 Monitor Limits When Unit Scaled to ppm When unit is scaled to ppm the display will read zero when the mA input signal is between 3 and 4 mA. -
Page 27: Digital Communication Parameters Set-Up
Easidew DryCheck User’s Manual OPERATION Digital Communication Parameters Set-Up The default parameters for the Easidew Drycheck are as follows: Default Address = 1, Baud rate = 9600, Parity = None, Stop bits = 1 To change these parameters, proceed as follows: Figure 14 shows the operational key sequence. -
Page 28: Figure 14 Set-Up Data Communications Parameters
Easidew DryCheck User’s Manual OPERATION Main display Set Parity 0000 = None 0001 = Odd 0002 = Even Set number of Set Address stop bits Range between 0000 = 1 stop bit 0001 and 0247 0001 = 2 stop bits Set baud Main Display (°F) -
Page 29: Monitor - Reading The Displayed Value Using Modbus Rtu Over Rs232
Easidew DryCheck User’s Manual OPERATION Monitor – Reading the Displayed Value Using Modbus RTU Over RS232 It is possible to communicate with the online monitor using Modbus RTU over RS232. The monitor has a three pin serial port connection on the back – the required cable can be supplied by Michell. -
Page 30: Good Measurement Practice
OPERATION GOOD MEASUREMENT PRACTICE The Easidew DryCheck is designed to operate in a flowing gas stream and is suitable for the measurement of the moisture content of a wide variety of gases. In general, if the gas (in conjunction with water vapor) is not corrosive to ceramics or base metals then it will be suitable for measurement by the Easidew DryCheck. -
Page 31: Maintenance
Easidew DryCheck User’s Manual GOOD MEASUREMENT PRACTICE MAINTENANCE General Maintenance Guidelines Routine maintenance of the Easidew DryCheck is confined to filter element replacement and regular recalibration of the dew-point transmitter. Calibration Routine maintenance of the transmitter is confined to regular re-calibration by exposure of the transmitter to sample gases of known moisture content to ensure that the stated accuracy is maintained. -
Page 32: Inspection/Cleaning
Easidew DryCheck User’s Manual MAINTENANCE Inspection/Cleaning The composition of the gas determines the frequency of the filter element replacement, i.e. liquid and particulate contaminates, corrosive elements, etc. A disposable filter element continues to filter at its original efficiency as long as it is kept in service. -
Page 33: Fault Conditions
Easidew DryCheck User’s Manual MAINTENANCE Fault Conditions Message Cause Action Displayed Check power supply to transmitter. Check Sensor failure transmitter cable for continuity/damage. Rectify/replace cable. ErrL Refer to Michell or local representative for Instrument failure repair. Check transmitter cable for continuity/ Sensor failure or break in damage. - Page 34 Easidew DryCheck User’s Manual APPENDIX A Appendix A Technical Specifications 97108 Issue 13, July 2017...
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Page 35: Appendix A Technical Specifications
Easidew DryCheck User’s Manual APPENDIX A Appendix A Technical Specifications -100 to +20°Cdp Electrical Specifi cations Power Supply 85 to 265 V AC, 50/60 Hz Operating Specifi cations Operating Temperature -5 to +50°C (+23 to +122°F) Storage Temperature -40 to +75°C (-40 to +167°F) -100 to +20°Cdp (-148 to +68°F) - Page 36 Easidew DryCheck User’s Manual APPENDIX B Appendix B System Drawing 97108 Issue 13, July 2017...
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Page 37: Figure 17 System Drawings
Easidew DryCheck User’s Manual APPENDIX B Appendix B System Drawing Figure 17 System Drawings Michell Instruments... - Page 38 Easidew DryCheck User’s Manual APPENDIX C Appendix C Quality, Recycling & Warranty Information 97108 Issue 13, July 2017...
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Page 39: Appendix C Quality, Recycling & Warranty Information
Easidew DryCheck User’s Manual APPENDIX C Appendix C 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 40 Easidew DryCheck User’s Manual APPENDIX D Appendix D Return Document & Decontamination Declaration 97108 Issue 13, July 2017...
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Page 41: Appendix D 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 43 http://www.michell.com...
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