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Related Manuals for Michell Instruments Pura
Summary of Contents for Michell Instruments Pura
- Page 1 Pura Advanced Online Hygrometer User Manual 97074 Issue 10 December 2021...
- Page 2 Please fill out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Product Name Order Code Serial Number Invoice Date Installation Location Tag Number Product Name Order Code Serial Number...
- Page 3 © 2021 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
INSTALLATION ....................2 Unpacking the Instrument ................... 2 2.1.1 Unpacking Pura Advanced Online Hygrometer ..........2 2.1.2 Unpacking Pura SEN (transmitter, no block version) ......... 3 2.1.3 Unpacking Pura OEM-single bag, PRM-double bag versions ......4 2.1.4 Unpacking Monitor ..................4 Pura Advanced Online Components .............. - Page 5 Unpacking – Monitor and Pura SEN, no block version ........2 Figure 2 Unpacking – Monitor and Pura OEM / PRM ...........3 Figure 3 Unpacking – Pura OEM & PRM – Single / Double Bag ........4 Figure 4 Unpacking – Monitor ...................4 Figure 5 Components ....................5...
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Page 6: Safety
Michell Instruments can offer a variety of re-calibration and exchange transmitter schemes to suit your specific needs. A local representative will be pleased to provide detailed, custom advice. -
Page 7: Abbreviations
Pura Advanced Online Hygrometer User 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 dew point foot (feet) - Page 8 Pura Advanced Online Hygrometer User Manual viii 97074 Issue 10, December 2021...
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Page 9: Introduction
The system comprises a programmable monitor configured to accept a unique Michell Mnet data string from the Pura transmitter. The zero and span of the monitor are set to cover the dew-point range -120 °C...-40 °Cdp (-184 °F...-40 °Fdp) at operating pressures up to 24 MPa (240 barg/3480 psig). -
Page 10: Installation
Unpacking the Instrument 2.1.1 Unpacking Pura Advanced Online Hygrometer The Pura Advanced Hygrometer instrument and accessories are packed in a box and the method of unpacking is shown as follows: Figure 1 Unpacking – Monitor and Pura SEN, no block version... -
Page 11: Unpacking Pura Sen (Transmitter, No Block Version)
Pura Advanced Online Hygrometer User Manual INSTALLATION Unpacking – Monitor and Pura OEM / PRM Figure 2 2.1.2 Unpacking Pura SEN (transmitter, no block version) Unpack the dew-point transmitter from the rectangular cardboard box. NOTE: The transmitter sensing element is protected while in transit by a red cover containing a small desiccant capsule. -
Page 12: Unpacking Pura Oem-Single Bag, Prm-Double Bag Versions
INSTALLATION 2.1.3 Unpacking Pura OEM-single bag, PRM-double bag versions Figure 3 Unpacking – Pura OEM & PRM – Single / Double Bag 2.1.4 Unpacking Monitor The monitor (2) is packed, together with its fixing clamps (1) as shown below. Unpacking – Monitor... -
Page 13: Pura Advanced Online Components
Pura Advanced Online Hygrometer User Manual INSTALLATION Pura Advanced Online Components On delivery, please check that all the following standard components are present in the packing box. Report any shortages immediately. Figure 5 Components PURA Monitor Clamps Sensor cable assembly... -
Page 14: Pura Sen
NOTE: For environmental and operating conditions, refer to Appendix A, Technical Specifications. NOTE: OEM and PRM version transmitters are protected in transit by putting in a plastic bag filled with nitrogen. Pura OEM transmitter has single bag protection, Pura PRM transmitter has double bag protection. Electrical connector... -
Page 15: Monitor
Pura Advanced Online Hygrometer User Manual INSTALLATION Monitor The instrument has a 5-digit display, set up on delivery to display a dew-point temperature range of -120 °C...-40 °Cdp (-40 °F...-184 °Fdp). Dew-point temperature units are displayed by the last LED located to the far right of the display. -
Page 16: Transmitter Mounting
Pura Advanced Online Hygrometer User Manual INSTALLATION Transmitter Mounting 2.7.1 Sensor Block Connection (Recommended Method) The following procedure must be carried out by a qualified installation engineer. WARNING: Under no circumstances should the sensing element be handled with the fingers. -
Page 17: Direct Pipeline Connection
Michell Instruments recommends the use of Swagelok retained gasket assemblies, ® containing silver plated, stainless steel 1/2” VCR gaskets, when connecting the Pura into a gas line. NOTE: Do not overtighten or the thread on the pipework may be stripped. -
Page 18: Pura Oem & Prm Connection
2.7.3 Pura OEM & PRM Connection The Pura OEM and PRM have been assembled and packaged within a Class 100 clean- room environment. To maintain this level of cleanliness the packaging should only be unpackaged within the same, or cleaner, environment. -
Page 19: Sensor Cables
Pura Advanced Online Hygrometer User Manual INSTALLATION Sensor Cables 2.8.1 Self-Assembly For guidance on type of cable, refer to Section 2.8.2, Cable Selection for Self-Assembled Cables. Assembly Instructions Remove the screw from the rear of the DIN connector housing. Lever the terminal block from the connector housing by inserting a small screwdriver in the notch on the front face of the terminal block. -
Page 20: Wiring Connection Between The Transmitter And The Monitor
Pura Advanced Online Hygrometer User Manual INSTALLATION 2.8.3 Wiring Connection Between the Transmitter and the Monitor The diagram below shows the identity of the connector terminals. YELLOW Signal A YELLOW GREEN GREEN GREEN Signal B Signal (B) PIN 1 BLUE... -
Page 21: Mounting The Monitor
Pura Advanced Online Hygrometer User Manual INSTALLATION Mounting the Monitor The monitor is designed for panel mounting and requires a panel cut-out of 46 x 92 mm (1.8 x 3.6”). The recommended panel thickness is 2...5 mm (0.08...0.2”). To mount the unit, proceed as follows:... -
Page 22: Electrical Connections
Pura Advanced Online Hygrometer User Manual INSTALLATION 2.10 Electrical Connections The power supply voltage is indicated on the connection detail label located on the monitor. As the monitor is provided for continuous operation it does not have an ON/ OFF switch. -
Page 23: Low Voltage Power Supply Input (Optional)
Pura Advanced Online Hygrometer User Manual INSTALLATION 2.10.2 Low Voltage Power Supply Input (Optional) For low voltage powered display • 18...36 V AC and 9...60 V DC Connect the power supply to the monitor (1) as shown in Figure 16. -
Page 24: Transmitter Connections
Pura Advanced Online Hygrometer User Manual INSTALLATION 2.12 Transmitter Connections Connect the transmitter cable to the monitor as shown below. Transmitter Connections Figure 18 97074 Issue 10, December 2021... -
Page 25: Operation
Pura Advanced Online Hygrometer User Manual OPERATION OPERATION When the instrument is first powered-up the display may show a zero value for about 1 second, followed by a flashing OPEN approximately 5 seconds, before showing a dew-point value. This is normal and does not indicate a problem with the instrument. -
Page 26: Selecting The Engineering Units
Pura Advanced Online Hygrometer User Manual OPERATION 3.1.1 Selecting the Engineering Units Ensure security lockout switches are in the OFF position (Section 4.1) While pressing SETUP, press once. Release both buttons and keep pressing SETUP until CODE 7 is displayed. -
Page 27: Hysteresis, Make/Break Delay & Delay Type
Pura Advanced Online Hygrometer User Manual OPERATION Digit 2 of SPC_n controls the source of the alarm. Displayed value (DEFAULT) – the alarm setpoint is based on the current engineering unit Dew Point only Pressure Open transmitter connection Open / short circuit transmitter... -
Page 28: Analog Output Scaling
Pura Advanced Online Hygrometer User Manual OPERATION • The maximum make and break delay time is 9 hours, 6 minutes, 6 seconds, in increments of 1 second. The setpoint can have four different Delay types: • NorM (normal) • rEPt (repeat) •... -
Page 29: Pressure Compensation
Pura Advanced Online Hygrometer User Manual OPERATION Pressure Compensation Ensure security lockout switches are in the OFF position (Section 4.1) The monitor has the ability to measure pressure in order to provide a pressure compensated value for ppm Using a Pressure Transducer... -
Page 30: Automatic Pressure Input Calibration
Pura Advanced Online Hygrometer User Manual OPERATION 3.3.2 Automatic Pressure Input Calibration Alternatively, the pressure input can be calibrated using a 4...20 mA source. Connect the current source between pin 2 (-ve) and pin 5 (+ve). to 022 and press SETUP . -
Page 31: Maintenance
All calibrations are traceable to national standards either via the National Physical Laboratory (UK) or the National Institute of Standards and Technology (USA). The Pura transmitter can be returned to Michell Instruments either directly or via the authorized distributor, for calibration. -
Page 32: Measurement Guide
Pura Advanced Online Hygrometer User Manual MEASUREMENT GUIDE MEASUREMENT GUIDE Sampling Considerations There are two basic methods of measuring a sample with the Pura Transmitter: • In-situ measurements are made by placing the transmitter inside the environment to be measured. -
Page 33: Figure 20 Installation Location
Pura Advanced Online Hygrometer User Manual MEASUREMENT GUIDE In-Situ Dew-Point Sensor Position – will the sensor see an area of the environment that is representative of what you want to measure? For example, if the sensor is to be mounted into a glove box, there are three different positions in which it could be installed –... - Page 34 Sample Temperature – Although the Pura can be operated at sample temperatures up to 60 °C, it is advisable to keep the sample temperature as close to ambient, and as stable as possible to keep adsorption & desorption characteristics as consistent as possible (see Section 3.2, Sampling Hints, for...
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Page 35: Sampling Hints
Pura Advanced Online Hygrometer User Manual MEASUREMENT GUIDE 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 36: Figure 23 Dead Volume
Pura Advanced Online Hygrometer User Manual MEASUREMENT GUIDE In practical terms, as the temperature of the environment fluctuates, water molecules are adsorbed and desorbed from the internal surfaces of the sample tubing, causing small fluctuations in the measured dew point. - Page 37 Pura Advanced Online Hygrometer User Manual MEASUREMENT GUIDE The integrity of all connections is also an important consideration, especially when sampling low dew points at an elevated pressure. If a small leak occurs in a high pressure line, gas will leak out but vortices at the leak point and a negative vapor pressure differential will also allow water vapor to contaminate the flow.
- Page 38 Pura Advanced Online Hygrometer User Manual APPENDIX A Appendix A Technical Specifications 97074 Issue 10, December 2021...
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Page 39: Appendix A Technical Specifications
Monitor: 1/8 DIN Case, 96 x 48 x 85 mm (w x h x d) Pura SEN- 1/2” VCR female process connection Sensor Process Connection Pura OEM & PRM 2 x 1/4” VCR male process connection Sensor Weight Pura PRM & OEM – 450 g (15.8 oz) -
Page 40: Figure 24 Pura Sen
Pura Advanced Online Hygrometer User Manual APPENDIX A Figure 24 Pura SEN Figure 25 Pura PRM & OEM 16mm MONITOR (0.6”) 117mm (4.6”) 42mm 47mm (1.7”) (1.9”) 96mm SIDE VIEW (3.7”) FRONT VIEW (0.2”) - Page 41 Pura Advanced Online Hygrometer User Manual APPENDIX B Appendix B Setup Codes Michell Instruments...
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Page 42: Appendix B Setup Codes
Pura Advanced Online Hygrometer User Manual APPENDIX B Appendix B Setup Codes Calibration modes for input and output DEFAULT VALUE = 052 Digit 1st digit (left most) 2nd digit 3rd digit Calibration Mode Calibration Function Object for Calibration Calibration functions as... - Page 43 Pura Advanced Online Hygrometer User Manual APPENDIX B CODE 4 Channel 1 Measurement task, Sampling rate DEFAULT VALUE = 207 Digit 1st digit (left most) 2nd digit 3rd digit Analog Sample Rate Analog Output 1 Source 0 only (No Function)
- Page 44 Pura Advanced Online Hygrometer User Manual APPENDIX C Appendix C Quality, Recycling & Warranty Information 97074 Issue 10, December 2021...
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Page 45: Appendix C Quality, Recycling & Warranty Information
Pura Advanced Online Hygrometer User 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 46 Pura Advanced Online Hygrometer User Manual APPENDIX D Appendix D Return Document & Decontamination Declaration 97074 Issue 10, December 2021...
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Page 47: 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 materials. For most applications involving solvents, acidic, basic, flammable or toxic gases a simple purge with dry gas (dew point <-30°C) over 24 hours should be sufficient to decontaminate the unit prior to return. - Page 48 www.ProcessSensing.com http://www.michell.com...
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