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Easidew Plus
Portable Hygrometer
User's Manual
97478 Issue 1
Kahn Instruments, Inc. 2015
This document is the property of Kahn Instruments and may not, either in part or whole, be copied or
otherwise reproduced, communicated in any way to third parties nor stored in any data processing
system, without the written authority of Kahn Instruments, Inc.
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Summary of Contents for Kahn Easidew Plus
- Page 1 97478 Issue 1 Kahn Instruments, Inc. 2015 This document is the property of Kahn Instruments and may not, either in part or whole, be copied or otherwise reproduced, communicated in any way to third parties nor stored in any data processing...
- Page 2 Easidew Plus Portable Hygrometer For Kahn Instruments' contact information please go to www.kahn.com...
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Page 3: Table Of Contents
GOOD MEASUREMENT PRACTICE ...............8 MAINTENANCE ....................12 Calibration ....................... 12 Sensor / Battery Replacement ................12 Filter Cartridge Replacement ................14 Checking the Easidew Plus Portable Hygrometer Electronics Calibration ....14 List of Spares ....................14 Troubleshooting ....................15 Figures Figure 1 Swagelok Fitting Instructions ..............3... -
Page 4: Safety
Kahn Instruments’ worldwide offices contact information. Calibration The recommended calibration interval for the Easidew Plus Portable Hygrometer is one year, unless otherwise specified by Kahn Instruments The instrument should be returned to Kahn Instruments. 97478 Issue 1, October 2014... -
Page 5: Abbreviations
Easidew Plus Portable 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) gauge °C degrees Celsius °F degrees Fahrenheit dew point feet kilogram pound... -
Page 6: Introduction
The measured dew point from the sensor is shown on the clear red LED display on the front panel of the instrument. The Easidew Plus Portable Hygrometer can be supplied with either °C or °F dew-point measurement units. -
Page 7: Installation
• 0.4mm orifice Before using the Easidew Plus Portable Hygrometer for the first time it is recommended that the battery pack is charged for a minimum of 12 hours. The case has a pressure relief valve on the exterior below the handle. When closed, the case is completely sealed. -
Page 8: Figure 1 Swagelok ® Fitting Instructions
Easidew Plus Portable Hygrometer User’s Manual INSTALLATION 3. While holding the fitting body steady, tighten the nut one-quarter turn Do not use the Swagelok gap inspection gauge with machined ferrule ends. NOTE: Connect the machined ferrule end before connecting the tube adapter end... -
Page 9: Operation
(10 - 300 barg) Small orifice (#2) Adaptor Fittings Figure 1A General Operation To operate the Easidew Plus Portable Hygrometer, follow these instructions: 1. Insure that both the gas fittings and the Swagelok tube fittings are fully ® tightened before use. -
Page 10: Measuring Dew Points Below -40°F (-40°C )
-40°F (-40°C ) and above. 9. Switch the unit off and disconnect the sample lines. Before disconnecting the Easidew Plus Portable Hygrometer from the gas line it is essential to vent the system to atmospheric pressure, otherwise severe injury could result. -
Page 11: User Controls
Err I = Sensor fault or sensor disconnected Power Switch Switches the Easidew Plus Portable Hygrometer ON or OFF. This 1A quick blow fuse provides protection for the display Fuse electronics in the event of a fault with the charger or battery pack. -
Page 12: 4-20 Ma Output Socket Wiring
OPERATION 4–20 mA Output Socket Wiring The Easidew Plus Portable Hygrometer provides a linear 4-20 mA output scaled from -76 to +140°F (-60 to +60°C). The socket accepts a 3 pole ¼” jack plug (supplied) and should be wired as shown below: ... -
Page 13: Good Measurement Practice
Easidew Plus Portable Hygrometer User’s Manual GOOD MEASUREMENT PRACTICE GOOD MEASUREMENT PRACTICE 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. - Page 14 Easidew Plus Portable Hygrometer User’s Manual GOOD MEASUREMENT PRACTICE Adsorption and Desorption Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to the surface of a material, creating a film. The rate of adsorption is increased at higher pressures and lower temperatures.
- Page 15 Easidew Plus Portable Hygrometer User’s Manual GOOD MEASUREMENT PRACTICE Sample Conditioning Sample conditioning is often necessary to avoid exposure of sensitive measuring components to liquids and other contaminants which may cause damage or affect the accuracy over time, depending on the measurement technology.
- Page 16 Which Gases to Measure? The Easidew Plus Portable 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.
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Page 17: Maintenance
Easidew Plus Portable Hygrometer User’s Manual MAINTENANCE MAINTENANCE Routine maintenance of the Easidew Plus Portable Hygrometer is confined to regular re-calibration of the internal, removable polymer capacitive sensor and replacement of the filter cartridge. Calibration The calibration of the internal sensor is traceable to national standards. For this reason it should only be calibrated in an accredited, US National Institute of Standards and Technology (NIST) standards laboratory. - Page 18 Easidew Plus Portable Hygrometer User’s Manual MAINTENANCE If the front panel prevents the connector from fitting onto the sensor, follow the instructions below: • Completely unscrew the cable gland on the GDSN connector to release the cable tension. • Remove the locking screw from the back of the connector (retaining the metal O-ring).
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Page 19: Filter Cartridge Replacement
At 4 mA the display should show -60.0°Cdp ±0.5°C (-76.0°Fdp ±0.9°F) At 20 mA the display should show -76.0°Fdp ±0.9°F (-60.0°Cdp ±0.5°C) If the displayed values are outside of this range, please contact Kahn Instruments' Service Department. List of Spares... -
Page 20: Troubleshooting
Easidew Plus Portable Hygrometer User’s Manual MAINTENANCE Troubleshooting Symptom Cause Actions Sensor disconnected or sensor element / sensor Check sensor cable is securely thermistor fault. connected inside instrument. NOTE: This error is ErrI Check instrument electronics with Display shows “... -
Page 21: Technical Specifications
Easidew Plus Portable Hygrometer User’s Manual APPENDIX A Appendix A Technical Specifications 97478 Issue 1, October 2014... -
Page 22: Appendix A Technical Specifications
Easidew Plus Portable Hygrometer User’s Manual APPENDIX A Appendix A Technical Specifications Performance Measurement Technology Polymer Capacitive Measurement Range -58 to +68°Fdp (-50 to +20°Cdp) Accuracy ±3.6°Fdp (±2°Cdp) Run time 12 - 16 hours Charge time 16 hours for maximum charge... - Page 23 Easidew Plus Portable Hygrometer User’s Manual APPENDIX B Appendix B EU Declaration of Conformity 97478 Issue 1, October 2014...
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Page 24: Appendix Beu Declaration Of Conformity
Easidew Plus Portable Hygrometer User’s Manual APPENDIX B Appendix B EU Declaration of Conformity Kahn Instruments...