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Summary of Contents for Michell Instruments 4000 Series
- Page 1 SERIES 4000 Precision Dewpointmeters (Remote, Climatic, RS and TRS) Users Guide Issue 21, August 2009 Manual No. 97051 43 Pages 1999 Michell Instruments Ltd...
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Page 2: Table Of Contents
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide TABLE OF CONTENTS INTRODUCTION General ....................4 Operating Principle .................5 Calibration ....................5 Manufacturing Quality................5 INSTRUMENT DESCRIPTION Monitor Front Panel ................6 Monitor Rear Panel.................6 Sensor Unit.....................6 Monitor Front Panel Controls ..............7 Monitor Rear Panel Controls / Connections ..........8 Operation / Standby Modes ..............8 2.6.1 Operation Mode 2.6.2 Standby Mode... - Page 3 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Which Gases to Measure? ..............19 Operating the Hygrometer ..............19 4.4.1 General 4.4.2 Adjusting the Sensor Body Temperature (RS and TRS Models) 4.4.3 Adjusting the Balance Compensation System 4.4.4 Automatic Operation 4.4.5 Manual Operation 4.4.6 Effectiveness of the ABC Operation Additional Operating Guidelines for S4000 TRS ........24...
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Page 4: Introduction
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide INTRODUCTION General Michell Instruments manufacture a wide range of on-line and portable instruments for the determination of moisture content in air and gases. In addition, the company manufactures Humidity Calibration Systems for Industrial and Scientific users and undertakes custom design-and-build contracts for large scale humidity monitoring and control applications. -
Page 5: Operating Principle
Calibration Michell Instruments‟ calibration facilities are amongst the most sophisticated in the world and have been recognised for their excellence by the National Physical Laboratory (NPL) UK. Our humidity calibration laboratory is accredited by UKAS for... -
Page 6: Instrument Description
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide INSTRUMENT DESCRIPTION The Series 4000 Remote Precision Dewpointmeter comprises of two individual units, a sensor and a monitor, interconnected by three cables carrying the control, optical and measurement signals. The Remote monitor unit is constructed in a 19" 3U sub- rack enclosure, and requires only a mains power supply for operation. -
Page 7: Monitor Front Panel Controls
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide the Peltier cooling device. If the sensor is a refrigerated model, then the complete sensor assembly is mounted directly to a single or dual refrigeration system. Sample gas is transmitted into the measurement chamber through stainless steel pipe-work and fittings to ensure negligible contamination of the sample gas. -
Page 8: Monitor Rear Panel Controls / Connections
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Monitor Rear Panel Controls / Connections The following is a basic description of the function of each of the rear panel user controls and connections. For further information refer to the relevant Section or Section 4.0. -
Page 9: Manual / Auto Modes
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Manual / Auto Modes The instrument may be operated in an automatic or manual mode of operation. The switch on the front panel MANUAL / AUTO sets the mode of operation. The mode may be changed at any time, but the front panel INITIATE push-button is only active when the switch is in the MANUAL position. -
Page 10: Manual Balance Compensation
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Manual Balance Compensation If the instrument is being used for calibration applications, or to measure dew points below -60 °C, or in system configurations where the dew-point measurement cannot be interrupted, it is recommended that the automatic balance compensation is disabled to avoid a potential interruption of measurement. -
Page 11: Data Hold
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Data Hold The data-hold facility allows the measured dew-point temperature to be temporarily held during and after an ABC cycle. The measured dew point at the moment the balance cycle starts is maintained for a time period, defined by the user. This time period allows the balance cycle to be completed and the measured dew point to settle before returning to normal measurement mode. -
Page 12: 2.12 Display Operation
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Momentary pressing of the MAX COOL button should cause a dip in the mirror temperature, which, upon release of the button, will provoke the mirror temperature into oscillation around the dew-point value. After a few minutes the mirror should return to its original stable temperature. -
Page 13: Lower Display
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide 2.12.2 Lower Display When the instrument is initially switched ON, the water content in ppm(v) (Parts Per Million by Volume) is displayed on the lower display. By pressing the lower “UNIT SELECT”... -
Page 14: 2.13 Pressure Measurement
The pressure is displayed in kPa, and is available as a digital output on the RS232 interface. Refer to Section 4.6.2. The standard pressure range is 0 to 50 p.s.i. absolute, but particular pressure ranges may be supplied to order. Contact Michell Instruments‟ Technical Sales Department for further information. Remote Pressure Connection A 6 pin circular socket (type Hirose RM12B Series Bayonet) on the monitor unit rear panel marked „REMOTE PRESSURE‟... -
Page 15: Installation
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide INSTALLATION General The Series 4000 Precision Hygrometer is supplied with a full accessory package. Please check that you have received all the items listed on the Packing Check List. Both the Monitor and Sensor Units (if applicable) have single 3 pin I.E.C. plug connections for the mains supply. -
Page 16: Installing The Sensor
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Installing the Sensor Sample gas connections are made through pipe couplings marked "GAS IN" and "GAS OUT". These couplings are suitable for use with 6mm O.D. stainless steel or P.T.F.E. tubing. If the vent gas is not routed to another test set or measuring instrument then lower quality tubing may be used on the "GAS OUT"... -
Page 17: S4000 Trs Enclosure
The power supply voltage setting cannot be changed by the user. Contact Michell Instruments' Technical Sales Department for advice. A single 3 pin IEC plug is available on the rear panel of the instrument for connecting to the appropriate power supply. -
Page 18: Operation
If particulates such as degraded desiccant or pipe swarf and rust are possible, use a particulate in- line filter. Michell instruments' technical sales staff will be pleased to give advice. Page 18... -
Page 19: Which Gases To Measure
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Use high quality sample pipe fittings. We would recommend that, wherever possible, stainless steel pipe-work and fittings are used. This is particularly important at low dew points since other materials have hygroscopic characteristics and absorb moisture in the pipe walls. -
Page 20: Adjusting The Sensor Body Temperature (Rs And Trs Models)
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide If the instrument is an RS or TRS model, when the Sensor Unit is switched ON the temperature controllers‟ digital display should illuminate. The Sensor Unit is fitted with a two or three position power switch, depending on the model : S4000 RS : Up position is off. -
Page 21: Adjusting The Balance Compensation System
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide WARNING Do not set the CAL 3200 to temperatures above 0 o C for periods of no longer than 30 minutes, as this will result in damage to the refrigeration system. Always ensure that the sensor body temperature is set to at least 20 o C Note: above the dew point being measured, up to -20 o C dew point to avoid any... -
Page 22: Automatic Operation
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Adjust the Optical Balance Control such that the Optical Balance meter indicates centre-scale i.e. balanced. This compensates the ABC system for the current level of contamination of the optical system. Check that during the Balance Cycle the ABC Status L.E.D. -
Page 23: Effectiveness Of The Abc Operation
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide 4.4.6 Effectiveness of the ABC Operation Observe the OPTICAL BALANCE CONTROL meter and the ABC STATUS (L.E.D.) on the Monitor Unit front panel. In normal operating mode the meter pointer will be towards the left-hand side of the meter or, even off-scale. -
Page 24: Additional Operating Guidelines For S4000 Trs
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Additional Operating Guidelines for S4000 TRS When operating the S4000 TRS Precision Dew-point Hygrometer the following further operating guidelines should be considered : For measurement of dew points below –10 o C the S4000 TRS sensor unit refrigeration system should be operated - failure to do so may result in overheating and possibly damaging the sensor body. -
Page 25: Analogue Inputs / Outputs
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide User Inputs / Outputs 4.5.1 Analogue Inputs / Outputs The monitor unit has fitted, as standard, the following inputs and outputs. These are available on the “User I/O” connector located at the rear of the monitor unit. Function Range Notes... - Page 26 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide The following parameters may be read via the RS232 interface : Dew point ( o C) Dew point ( o F) Water Content (ppm(v)) Water Content in SF (ppm(w)) Water Content (g/m Water Content (g/kg) Pressure (KPa) Relative Humidity (% rh)
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Page 27: Direct Measurement Of Mirror Temperature
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide Direct Measurement of Mirror Temperature The sensor P.R.T. may be read directly using a suitable external resistance bridge. This can be achieved by temporarily disconnecting the cable connecting the sensor PRT to the S4000 Monitor Unit. - Page 28 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide The effect of these ice formations can be significant to the user as they directly affect the accuracy of the measurement being made. It is therefore important that the user is aware of the measurement errors that can occur, can identify the differences in formation and can use the appropriate technique to force a good formation, and by so doing achieve an accurate dew point measurement at all times.
- Page 29 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide 1) Press the “Max Cool” button for 1 to 2 minutes. 2) Release the button and as the displayed dewpoint temperature is seen to begin to rise momentarily depress (or pulse) for short periods the “Max Cool” button.
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Page 30: Technical Specifications
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide TECHNICAL SPECIFICATIONS General Accuracy - complete +/- 0.1 o C. dew point - displayed. system, nominal +/- 1.0 % rh - displayed. 0.5 o C. / second (average). Cooling rate Approx. -
Page 31: Monitor Unit
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide S4000 Climatic Sensor 5.5 kg ( 12.1 lb ). S4000 RS Sensor 31.5 kg ( 69.5 lb ). Dimensions :- S4000 Sensor 268mm(W) x 300mm Clear (D) x 133mm (H). Refer to Appendix 1b. -
Page 32: S4000 Trs Enclosure
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide % rh Calculation Calculated using water vapour pressure tables (D Sontag ITS-90). Over water for temperatures between 0 and 100 o C and over ice for temperatures between -100 and 0 o C. +/- 0.2 o C. -
Page 33: Maintenance
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide MAINTENANCE Cleaning the Optical System The Michell Series 4000 Remote is a precision optical dew-point hygrometer, which uses a four component optical system to detect condensation of water from a gas (air) sample. -
Page 34: Refrigeration Unit
If in the event a set temperature has not been reached, then it is a possibility that there could have been a loss of refrigerant gas. Contact Michell Instruments' Technical Sales Department or your local representative for further advice. -
Page 35: Options
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide OPTIONS RS485 Output - Option With RS485, the request commands and responses are identical to those stated in Section 4.5.2. The 9 pin "D" type socket connector on the monitor unit rear panel marked “RS 485” has the following pin connections : Function Number... -
Page 36: Appendix 1 S4000 Remote Outline Drawings
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide APPENDIX 1 S4000 Remote Outline Drawings (a) S4000 Remote Monitor Outline Drawing Page 36 www.michell.com... - Page 37 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide 269.0 W ITHOUT 223.0 MICROSCOPE 240.0 40.0 S4000 SENSOR FRONT PANEL S4000 Cooled Mirror Sensor 133.0 (3U) NOTE CLIMATIC SENSOR VERSION HAS VENTILATION HOLES ON TOP AND S4000 SENSOR REAR PANEL BOTTOM COVERS.
- Page 38 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide (d) S4000 RS Functional Drawing Page 38 www.michell.com...
- Page 39 SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide (e) S4000 TRS Enclosure Outline Drawing Page 39 www.michell.com...
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Page 40: Appendix 2 System Schematic
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide APPENDIX 2 System Schematic SENSOR MONITOR DP 10 mV/ºC OUTPUT PRESSURE DP 4-20 mA TRANSDUCER PRESSURE OUTPUT MEASUREMENT RS232 MIRROR SERIAL TEMPERATURE COMMS MICRO MEASUREMENT PROCESSOR DIGITAL SAMPLE OUTPUT DISPLAY PELTIER rh 0-1 V DEW -POINT... -
Page 41: Appendix 3 S4000 Remote Depression Range
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide APPENDIX 3 S4000 Remote Depression Range °C -120 -100 -80 -60 -40 -20 0 +20 +40 +60 +80 +100 -120 -100 -80 -60 -40 -20 0 +20 +40 +60 +80 +100 °C As shown, with the S4000 Remote Dewpointmeter configured for a sensor body temperature of -40 °C, the maximum depression is -90 °C. -
Page 42: Appendix 4 Hazardous Products
Technical Sales Department. APPENDIX 5 Recycling Michell Instruments Limited is concerned with the protection of the environment. It is our commitment to reduce and eliminate from our operations, wherever possible, the use of substances which may be harmful to the environment. Similarly, we are increasingly using recyclable and/or recycled material in our business and products wherever it is practical to do so. -
Page 43: Appendix 8 Customer Service Contact Details
SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide APPENDIX 8 Customer Service Contact Details For advice on this, or any other Michell Instruments product, please feel free to contact us via our Web Site: www.michell.com Page 43 www.michell.com...
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