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Summary of Contents for Michell Instruments Pura
- Page 1 Pura Online Hygrometer User’s Manual 97303 Issue 1.2, March 2016 Michell Instruments...
- Page 2 Inside front cover (blank)
- Page 3 Pura Online Hygrometer © 2016 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
Pura Online Hygrometer 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 Recycling Policy ..........................viii WEEE And RoHS Compliance ......................viii Calibration Facilities ......................... - Page 5 Set-up process indicator (to read ppm ) ..............26 Figure 4.1 Transmitter connections ..................27 Figure 4.2 Dimensions - Pura Dew-Point Transmitter, Premium & OEM Versions ......28 Figure 4.3 Terminal block Removal ..................29 Figure 4.4 Rear of connector terminal block ................30 Figure 4.5 Electrical Connections ..................30...
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Page 6: Safety
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. The instrument should be returned to the manufacturer, Michell Instruments Ltd., or one of their accredited service agents for re-calibration. -
Page 7: Abbreviations
Pura Online Hygrometer 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) ºC degrees Celsius ºF degrees Fahrenheit direct current foot (feet) gram(s) Hertz “... -
Page 8: Recycling Policy
Pura Online Hygrometer User’s Manual Recycling Policy Michell Instruments 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. -
Page 9: Warranty
All warranty services are provided on a return to base basis. Any transportation costs for the return of a warranty claim shall reside with the Customer. Return Policy If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be completed: Notify a Michell Instruments’ representative, giving full details of the problem, the model variant and the serial number of the product. -
Page 10: Introduction
Specifi cations, Appendix A). The Pura Hygrometer utilizes the Pura Dew-Point Transmitter as the sensor, coupled with the Pura Online Monitor as the display unit. Dual alarm relay contacts are provided which are user-confi gurable, both in terms of set-point and operating mode. Current output is standard and factory set at 4-20 mA. -
Page 11: Display
Pura Online Hygrometer User’s Manual Display The instrument has a 4-digit display, set-up on delivery to display a dew-point temperature range of -40ºCdp (-40ºFdp) (corresponding to a transmitter input of 20 mA), to -120ºCdp (-184ºFdp) (corresponding to a transmitter input of 4 mA ). Negative temperature readings are signed. -
Page 12: Table 2.1 Process Indicator Front Panel Controls And Indicators
Pura Online Hygrometer User’s Manual Item Description ºFdp When illuminated, this LED indicates that the displayed dew-point reading is in degrees Fahrenheit. Note: If neither the ºFdp or ºCdp LED is lit, ppm is selected. ºCdp When illuminated, this LED indicates that the displayed dew-point reading is in degrees Celsius. -
Page 13: Function Keys
Pura Online Hygrometer User’s Manual Function Keys The four function keys, located below the display, are used for setting up the Process Indicator. The following set-up functions are covered in Section 3 of this Manual: • Reversal of alarm level switching logic •... -
Page 14: Process Indicator Menu Structure
Pura Online Hygrometer User’s Manual Process Indicator Menu Structure Once the Pura Hygrometer is set-up it should not require much adjustment. The dew-point transmitter is supplied, as standard, with a linear output of 4-20 mA (corresponding to -120ºCdp (-184ºFdp) and -40ºCdp (-40ºFdp) respectively). -
Page 15: Flowchart Reading Method
Pura Online Hygrometer User’s Manual Symbol Description Display reading / Indication Outline is shown as solid green if the display is static Display reading / Indication Outline is shown as solid red if the display is fl ashing Display Outline is shown as red, dashed, to indicate that the display is alternately fl... -
Page 16: Flowchart Example
Pura Online Hygrometer User’s Manual 2.3.2 Flowchart Example Main display The following is a fl owchart example showing the set-up of alarm levels. For actual set-up instructions see Section 3.6.2. Set x2 for Alarm 2 only The alarm set-point levels are set-up from the... -
Page 17: Operation
Pura Online Hygrometer User’s Manual OPERATION Operational Requirements The following operational requirements are required: 3.1.1 Environmental Requirements – Process Indicator Operating temperature range: 0 to +50ºC (+32 to +122ºF) Humidity: 90% RH (non-condensing) Altitude: Up to 2000m 3.1.2 Electrical Requirements... -
Page 18: Figure 3.1 Mounting The Process Indicator
Pura Online Hygrometer User’s Manual Figure 3.1 Mounting the Process Indicator Michell Instruments 97303 Issue 1.2, March 2016... -
Page 19: Electrical Connections
Pura Online Hygrometer User’s Manual Electrical Connections Electrical connections to the Pura Hygrometer system are as follows: • AC power supply, 100 V to 240 V AC (+10%, -15%), 50/60 Hz, 6 VA. A low voltage (24 V DC) option is also available. -
Page 20: Ac Power Supply Input
Pura Online Hygrometer User’s Manual 3.3.1 AC Power Supply Input It is essential that the connection of electrical supplies to this instrument be undertaken by competent personnel Connect the AC power supply to the Process Indicator (1) as shown in Figure 3.2 . Refer also to Table 3.1 which gives a summary of all the connections to the rear panel of the Process Indicator. -
Page 21: Preliminary System Test
Pura Online Hygrometer User’s Manual 3.3.2 Preliminary System Test Before wiring the external signal outputs and the transmitter, perform a system check as follows: 1. Switch off and disconnect the power supply. 2. Connect to an AC supply and switch the supply ON. The Process Indicator display should come on. -
Page 22: Dc Power Supply Input (Optional)
Pura Online Hygrometer User’s Manual 3.3.3 DC Power Supply Input (Optional) Connect the DC power supply to the Process Indicator (1) as shown in Figure 3.3 . Refer also to Table 3.1 which gives a summary of all the connections to the rear panel of the Process Indicator. -
Page 23: Signal Output Connections
Pura Online Hygrometer User’s Manual Signal Output Connections The Pura Hygrometer system has three signal outputs, Alarm 1 (ALr1), Alarm 2 (ALr2) and the re-transmitted input signal (4-20 mA or 0-20 mA current loop signal depending upon instrument confi guration). -
Page 24: Table 3.1 Summary Of Electrical Connections
Pura Online Hygrometer User’s Manual Terminal Wire Color Signal Supply Information Blue 0 V (GND) Green 4-20 mA loop current Default 4-20 mA Transmitter loop supply (+ve) +24 V DC w.r.t. terminal 1 User defi ned ALR2 (normally closed) User defi ned ALR2 (normally open) User defi... -
Page 25: First Time Operation
Pura Online Hygrometer User’s Manual First Time Operation Prior to operation, the instrument must be connected to the correct electrical power supply and the relevant analog and alarm outputs connected to external systems as required and as described above. To commence operation, proceed as follows: 1. -
Page 26: System Alarms
Pura Online Hygrometer User’s Manual System Alarms The Pura Hygrometer has two alarm outputs. As supplied, the default alarm set-points and the alarm switching logic are as follows (the default temperature units are degrees Celsius): • Low Alarm - Alarm 1 (AL1) set to -20ºCdp •... -
Page 27: Reversal Of Default Alarm Switching Logic
Pura Online Hygrometer User’s Manual 3.6.1 Reversal of Default Alarm Switching Logic As stated in Section 3.6, the switching logic for the alarm channels may, if required, be individually reversed. Starting at the default state, the method of reversing the switching logic for both alarms is as follows: Figure 3.6 shows the operational key sequence. -
Page 28: Figure 3.6 Change Alarm Switching Logic
Pura Online Hygrometer User’s Manual Main Display (Change Alarm 2 Switching Logic) Main Main Display Display Figure 3.6 Change alarm switching logic Michell Instruments 97303 Issue 1.2, March 2016... -
Page 29: Set-Up Alarm Levels
Pura Online Hygrometer User’s Manual 3.6.2 Set-up Alarm Levels The alarm set-point levels are set-up from the Main display program menu as follows (to exit to the main display without saving any new settings press the ‘ ’ key): Set x2 for Alarm 2 only Figure 3.7 shows the operational key sequence. -
Page 30: Confi Gure Analog Output Current Loop
Pura Online Hygrometer User’s Manual 3.6.3 Confi gure Analog Output Current Loop The Pura Hygrometer 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 31: Change Dew-Point Temperature Range
Pura Online Hygrometer User’s Manual Change Dew-Point Temperature Range The default temperature unit for the Pura Hygrometer is degrees Celsius. This is indicated by the º indicator. The default settings associated with this temperature scale are as follows: • Span -40 to -120ºCdp... -
Page 32: Span And Unit Settings
Pura Online Hygrometer User’s Manual 3.7.1 Span and Unit Settings To change the span and unit settings, proceed Main Display (°C) as follows. Figure 3.9 shows the operational key sequence. 1. Press the ‘ ’ key once, the display will read ‘... -
Page 33: Confi Gure Alarm Set-Point Limits
Pura Online Hygrometer User’s Manual 3.7.2 Confi gure Alarm Set-Point Limits Main display The following procedure is used to set limits to which the alarm levels can be set (usually after re-confi guring the instrument’s range for Fahrenheit readings). Figure 3.10 shows the operational key sequence. -
Page 34: Change Scale Units (To Ppm )
Figure 3.11 shows the operational key sequence. Note: The dew-point transmitter must fi rst be programmed to provide an output proportional to by using the Michell application software. Contact Michell Instruments for information (for contact details see Appendix B). Press the ‘... -
Page 35: Figure 3.11 Set-Up Process Indicator (To Read Ppm )
Pura Online Hygrometer User’s Manual Main Display, e.g. °C Main Display, ppm(v) Figure 3.11 Set-up process indicator (to read ppm 97303 Issue 1.2, March 2016 Michell Instruments... -
Page 36: Sensor Installation
Pura Online Hygrometer User’s Manual SENSOR INSTALLATION Transmitter Connections Connect the transmitter cable to the Process Indicator (1) as shown in Figure 4.1. 10 11 21 22 19 20 16 17 14 15 Process Indicator viewed from above Figure 4.1 Transmitter connections 1. -
Page 37: Installing The Sensor
Pura Online Hygrometer User’s Manual Installing the Sensor The effective operation of the Pura Transmitter, in a fl owing gas environment, relies on the sensor being installed directly into the gas stream or by having a fully representative gas sample directed over the sensor measurement surface. -
Page 38: Transmitter Cable
Pura Online Hygrometer User’s Manual Transmitter Cable Cable connection to the Pura Transmitter is made via the removable connector. When removing the central screw ensure that the small sealing O-ring is retained on the screw and present during re-installation. Removing the central screw enables the connector terminal block to be removed from the outer housing by using a small screwdriver to prise it off. -
Page 39: Figure 4.4 Rear Of Connector Terminal Block
Pura Online Hygrometer User’s Manual The diagram below shows the identity of the connector terminals: Supply 4-20 mA PIN 1 Screen/Shield PIN 3 (GND) Optional Figure 4.4 Rear of connector terminal block Always connect the 4-20 mA return signal to a suitable load (see Figure 4.5) before the power is applied. -
Page 40: Which Gases To Measure
WHICH GASES TO MEASURE? The Pura Hygrometer is suitable for 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 Pura Hygrometer. - Page 41 Pura Online Hygrometer User’s Manual Appendix A Technical Specifi cations 97303 Issue 1.2, March 2016 Michell Instruments...
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Page 42: Appendix A Technical Specifi Cations
Pura Online Hygrometer User’s Manual Appendix A Technical Specifi cations Monitor Equipment Use Process indicator – dew-point measurement 48 x 96 x 86mm (1.9 x 3.8 x 3.4”) Horizontal, DIN 43700 Plastic housing Housing & Mounting for panel mounting. Panel cut out is 46 x 92mm (1.8 x 3.6”) - Page 43 Pura Online Hygrometer User’s Manual Transmitter Measurement Range (dew point) -120 to -40°C (-184 to -40°F) dew point Accuracy (dew point) ±1°C from -40 up to -60°C ±2°C from -60 up to -100°C ±4°C from -100 up to -120°C (estimated) Repeatability 0.5°C (0.9°F) dew point...
- Page 44 Pura Online Hygrometer User’s Manual Appendix B List of Worldwide Michell Instruments’ Offi ces Michell Instruments 97303 Issue 1.2, March 2016...
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Page 45: Appendix B List Of Worldwide Michell Instruments' Offi Ces
Pura Online Hygrometer User’s Manual Appendix B List of Worldwide Michell Instruments’ Offi ces Benelux Asia Michell Instruments Benelux BV Michell Asia Krombraak 11 PO Box 3149 4906 CR Oosterhout Joondalup The Netherlands WA 6027 Tel: +31 162 680 471... -
Page 46: Appendix Ceu Declaration Of Conformity
Pura Online Hygrometer User’s Manual Appendix C EU Declaration of Conformity Michell Instruments 97303 Issue 1.2, March 2016... - Page 47 Pura Online Hygrometer User’s Manual EU Declaration of Conformity NOTE: The PURA I.S. product incorporates the ATEX/IECEx/CSA/FM approved Easidew I.S. product and it is the Hazardous Area Certifi cation for the Easidew I.S. that provides the necessary approvals for the PURA I.S.
- Page 48 http://www.michell.com...
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