Cosa-xentaur Xentaur LPDT Manuel d'utilisateur

ock Road, Medford, NY 11763 USA Tel: (516) 345-3434

Section 2: Sensor and Sampling Techniquespage 32.1 Precautions using the sensorThe Xentaur HTF™ Al2O3 sensor is designed and field proven to be highly

LPDT User’s Manualpage 4tive.• Do not disassemble the porous metal filter encapsula-tion, as this will damage the sensor and void your fac-tory warran

Section 2: Sensor and Sampling Techniquespage 5diameter of tubing, number of interconnecting fittings, dead space in tubing and manifolds; will influe

LPDT User’s Manualpage 6• Under a pressurized system removal of the sensor with-out the installation of isolation valves can be dangerous.If in-situ i

Section 2: Sensor and Sampling Techniquespage 72.3.2 Extractive InstallationFor extractive installations we recommend our sample sys-tem ESS, which ma

LPDT User’s Manualpage 8It is generally recommended to measure at ambient pressure for the following reasons:• The readings will not be affected by va

Section 2: Sensor and Sampling Techniquespage 9• Do not install any devices upstream of the sensor, such as other measuring systems, flow meters etc.,

LPDT User’s Manualpage 10Troubleshooting unexpected readings (table spans 2 pages)For non-sensor related problems (e.g. no reading on instru-ment) ref

Section 2: Sensor and Sampling Techniquespage 11Troubleshooting unexpected readings (continued from previous page) Symptom Diagnostic/RemedyReading i

LPDT User’s Manualpage 12

LPDT User’s ManualiWhen calling your representative for technical support, please have your serial numbers available.The Sensor and Instrument Serial

Section 3: Instrumentpage 133.1 Precautions using the LPDTThe LPDT uses state-of-the-art microelectronics to provide a miniature full functioning ins

LPDT User’s Manualpage 14• Any circuitry which is activated by relay contacts should account for the contact bounce, one simple debouncing method is p

Section 3: Instrumentpage 15(and pressure if installed) can be read. In the digital mode multiple units can operate on the same loop cable as a mul

LPDT User’s Manualpage 16LPDT (the tension washer should be compressed), so that it does not come loose during use.3.3.2 Electrical InstallationThe LP

Section 3: Instrumentpage 173.4 Operating the Instrument3.4.1 Starting upThe instrument is ready for use as soon as the power cable is installed. Whe

LPDT User’s Manualpage 18not to change any parameter inadvertently.3. °C°F appear simultaneously, to indicate the sensors’ attenuation in decibels.4.

Section 3: Instrumentpage 193.4.3 Push ButtonsThree push buttons are located on the front panel.Each button is marked with an icon engraved above it.

LPDT User’s Manualpage 203.4.4.1 Viewing Dewpoint ModeIn this mode the user can view the dewpoint, this is indi-cated by the presence of the ‘DEWPOINT

Section 3: Instrumentpage 213.4.4.3 Start Calibration (SpanCheck™) ModeThe instrument is calibrated at the factory with the sensor it is shipped with

LPDT User’s Manualpage 222. Push the MODE key a few times until the display shows &$/. 3. Press the UP button. The display will show &1), prom

LPDT User’s ManualiiXentaur reserves the right to change or modify the product specification and / or appearance at any time without notice. Therefore

Section 3: Instrumentpage 23calibration procedure.7. Install the sensor in the sample cell or adapter fitting or put it back into the packaging conta

LPDT User’s Manualpage 24taken that the sensor temperature is not below the tempera-ture of the hand, as in such case condensation could occur and sup

Section 3: Instrumentpage 25diagram of the SetUp State.The setup state provides nine capabilities, each one con-trolled from its own mode. Depressing

LPDT User’s Manualpage 26tainer is labeled with the proper values.5.Calibration Adjustment: In this mode the user can enter a sensor specific Adjustme

Section 3: Instrumentpage 27f. Observe the display, if the buttons are not being pressed; the display will every few seconds show for a short duratio

LPDT User’s Manualpage 28the current loop output, refer to appendix G.9.Lock/Unlock the instrument: This mode is used to block access to parameter set

Section 3: Instrumentpage 29Legend:denotes alternately flashing messages.DISPLAY EXPLANATION REQUIRED ACTIONLO(55PROM check sum failed. powe

LPDT User’s Manualpage 30The instrument contains a fuse which may open if the instrument is subjected to voltages exceeding the specifica-tions. Under

Appendicespage 31Appendix A: Operating State User Interface flowchartTEMP ˚FXENTAUR LPDTSETXENTAUR LPDTSET XENTAUR LPDTXENTAUR LPDTPress togeth

LPDT User’s Manualpage 32Appendix B: Set-Up State User Interface flowchartSETSET LODEWPOINT˚CSET LO˚C˚FChoose alternate units to show when displ

LPDT User’s ManualiiiExamine the LPDT package for damage or mishan-dling. If any damage is evident notify the carrier and request an inspection.Unpack

Appendicespage 33User Interface Flow Diagram - Set-Up State (continued from previous page)LEGEND: 1. Arrows leading out from below a button depict

LPDT User’s Manualpage 34Appendix C: LPDT Mechanical Drawingflats for 1 " wrench78/1.750"oint TransmitterMaSeMoThinkSafetyReadManualwww.xe

Appendicespage 35Appendix D: LPDT Electrical ConnectionsOperation with Wall TransformerDewpoint viewed on Instrument DisplayOperation with Relay Opti

LPDT User’s Manualpage 36Appendix E: Sensor/SpanCheck™ Theory of OperationThe Sensor is constructed as a capacitor whose dielectric consists of porous

Appendicespage 37tion for small manufacturing deviations. As the sensor is used in real world applications, it is exposed to various elements and stre

LPDT User’s Manualpage 38

Appendicespage 39Appendix F: Pressure Correction Sensor Pressure is used in the context that this is the pres-sure inside the sampling chamber when pe

LPDT User’s Manualpage 40Appendix G: Current vs. Dewpoint The current being pulled by the LPDT, varies with the dew-point being measured by the LPDT.

Appendicespage 41vide a useful output. Consider an example where the area of interest to be monitored is 10 to 100 ppmV, and the analog output is set

LPDT User’s Manualpage 42Relationship of 4-20mA output and instrument reading in ppmV or LBSInstrument reading in ppmVInstrument reading in LBS of H2O

LPDT User’s ManualivWarrantyXentaur instruments are warranted to be free from defects in workmanship and materials. Liability under this warranty is l

Appendicespage 43Appendix H: Uncertainty in LBS & ppmV calculationsUncertainty of LBS & ppmV calculations due to +/-3˚C measurment accuracyCal

LPDT User’s Manualpage 44Appendix I: Sensor Response TimeTime (minutes)% of step change051015202530354045505560657075808590951001050510152025303540455

Appendicespage 45Appendix J: Return Authorization RequestXentaur must approve and assign a return authorization number (RAN) to any instrument being r

LPDT User’s Manualpage 46

Xentaur Corporation, 3661 Horseblock Road, Medford, NY 11763 USA Tel: (516) 345-3434

LPDT User’s ManualvLPDT User’s Manual Table of Contents1.0 Overview of the LPDT ...12.1 Precautions usi

LPDT User’s ManualviAppendix H: Uncertainty in LBS & ppmV calculations ..43Appendix I: Sensor Response Time ...44Ap

Section 1: Introductionpage 11.0 Overview of the LPDTThe LPDT is a microprocessor based 4-20mA loop powered (2 wire) hygrometer, for measuring moistur

LPDT User’s Manualpage 2