Epson XDT Manuel d'utilisateur Page 1

Section 2: Sensor and Sampling Techniques32. Sensor and Sampling Techniques2.1 Precautions using the sensorThe Xentaur HTF™ Al2O3 sensor is designed a

XDT User’s Manual42.2 Sensor Technical SpecificationsType: ...Hyper Thin Film HTF™ high capacitance Al2O3.Dewpoint rang

Section 2: Sensor and Sampling Techniques52.3.1 In-situ InstallationIn-situ installation is recommended only for measurements where the gas pressure i

XDT User’s Manual62.3.2 Extractive InstallationFor extractive installations we recommend our sample system ESS, which may be equipped with a variety o

Section 2: Sensor and Sampling Techniques7inside these materials.• Try to run pipes to the sensor upwards, so that contaminants tend to fall back into

XDT User’s Manual82.5 Troubleshooting unexpected readingsIf erroneous readings are suspected on a newly acquired instrument, compare the serial number

Section 3: Instrument93. Instrument3.1 Precautions using the XDTThe XDT uses state-of-the-art microelectronics to provide a compact full functioning i

XDT User’s Manual103.2 Instrument Technical SpecificationsEnclosure: ...XDT-OEM bare boardXDT-NEMA tabletop or surface mount, wa

Section 3: Instrument113.3 Installation3.3.1 Instrument Mechanical InstallationThe XDT is available in several different physical configurations. Plea

XDT User’s Manual123.3.2 Electrical ConnectionsAll connections are made via a 21 contact, pluggable screw terminal block referred to as P1. Cable acce

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

Section 3: Instrument13fast acting fuse. Please follow the appropriate installation procedures in the paragraphs below according to the electrical pow

XDT User’s Manual14dent relays corresponding to the HI and LO alarms. The relay contacts are rated at 10A 250VAC or 30VDC, instruments for use in divi

Section 3: Instrument153.3.2.5 Interfacing to the RS-232 optionThe optional RS-232C interface is provided on the P1 connector. The configuration is 96

XDT User’s Manual163.4.2 Display Conventions1. To display characters with the 7 segment numeric display, the following pseudo-alphanumer-ics are used:

Section 3: Instrument17switches described above.• With a front face plate which has labeled holes placed immediately above the circuit board switches,

XDT User’s Manual18parts per million by volume computed at the sensor pressure (more about pressure later). The LBS and G/M3 are density measurements,

Section 3: Instrument193.4.4.2 AlarmsThere are two independent optional alarms, they are named HI and LO alarms. Each alarm can activate a single pole

XDT User’s Manual205. Push the MODE button. The display will show:the ‘DEWPOINT’ indicator means that we are changing the alarm trigger dewpoint6. Pus

Section 3: Instrument213.4.4.3.1 SpanCheck™ ModeThe instrument is calibrated at the factory with the sensor it is shipped with and does not need to be

XDT User’s Manual22The instrument will retain the calibration even if the power is turned off.Under certain conditions, an over (super) saturated sens

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

Section 3: Instrument23point the waiting time may have to be increased - specially if the sensor was wet before the procedure is initiated. Consult wi

XDT User’s Manual24DEWPOINT legends will also appear. Use the UP and DOWN buttons to modify this dew-point to match the dewpoint of the reference gas.

Section 3: Instrument25• The instrument will display the measurement using the newly acquired calibration values.The instrument computes the dewpoint

XDT User’s Manual26CAUTION:2), 3), 4) and 5) are set at the factory and need only be modified when a sensor is changed.2. Selecting the sensor type: I

Section 3: Instrument27a. Go to the CAL/ADJ mode and press the UP button, the display will show the current value, in the range of -1.99 to +1.99 foll

XDT User’s Manual28ber can be corrected by reversing the use of the UP and DOWN keys), with the “12” flashing. Pressing the “MODE” button will flash t

Section 3: Instrument29• This configuration is also equipped with a NEMA sealed audio indicator (>80dB @ 3ft) mounted in the instrument enclosure.

XDT User’s Manual30Legend:  denotes a beeping accompaniment to the message./ denotes alternately flashing messages.DISPLAY EXPLANATION REQUIRED A

Section 3: Instrument313.7 MaintenanceThe XDT-PM and XDT-NEMA instrument enclosures may be cleaned when necessary using a damp (moist) cloth.The XDT-O

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XDT User’s ManualiiiExamine the XDT package for damage or mishandling. If any damage is evident notify the carrier and request an inspection.Unpack th

Glossary33Glossary0/24 mA . . . . . . . . . . . . . . . . range of current for the current loop (0mA=minimum reading, 24mA=maximum reading)4/20 mA .

XDT User’s Manual34used for the circuit (see 4/20)dB . . . . . . . . . . . . . . . . . . . . . see - decibelDB25. . . . . . . . . . . . . . . . . . .

Glossary35impedance . . . . . . . . . . . . . . . the ratio of voltage to current at a specified frequency measured in Ohms, a resistor of the same va

XDT User’s Manual36RG58. . . . . . . . . . . . . . . . . . . a type of coaxial cable - the letters/numbers refer to the electrical characteristic of t

XDT User’s Manual Appendices37Appendix A: Flow Diagram of Operating State User Interface˚C DEWPOINTSETSETHIHI/LOSETHISETLOSETLOSETLOSETHISETSETSETSETS

XDT User’s Manual Appendices38Flow Diagram Operating State User Interface (continued) Manual & Scheduled Self Calibration˚C DEWPOINTHI/LOSETSETSET

XDT User’s Manual Appendices39Appendix B: Flow Diagram of Set-Up State User InterfaceHi/LoSETSETSETLoLoLoHiSETSETSETSETSETSET SET SET SETSET SET SETSE

XDT User’s Manual Appendices40Appendix C: Sensor Mechanicalflats for 1 " wrench14/~1.45"14mm x 1.25mm3/4"-16Viton A O-ringfemale BNC

XDT User’s Manual Appendices41Appendix D: Optional Sensor Fittings

XDT User’s Manual Appendices42Appendix E: XDT Circuit Board DimensionsLOW RELAYHI RELAYNCNOCNCNOCCAUTIONRELAYVOLTAGEooGNDGND10VA50/60HZ100-250VACJ.F.M

XDT User’s ManualivWarrantyThis instrument is warranted to be free from defects in workmanship and materials. Liability under this warranty is limited

XDT User’s Manual Appendices43Appendix E (continued): XDT-PM Enclosure Mounting DimensionsStandard mounting (with clip-on compression brackets)Environ

XDT User’s Manual Appendices44Appendix E (continued): XDT-NEMA Enclosure Mounting Dimensions

XDT User’s Manual Appendices45Appendix F: Sensor/SpanCheck™ Theory of OperationThe Sensor is constructed as a capacitor whose dielectric consists of p

XDT User’s Manual Appendices46Appendix G: Dewpoint Response time AnalysisManufacturers of dewpoint sensors will make unbelievable claims of speed. But

XDT User’s Manual Appendices47Of course analyzing on a wet-up step will produce much faster results, because all sensors are fast on wet up, since Al2

XDT User’s Manual Appendices48Appendix H: Sample Gas Filter ConsiderationsSample treatment with pre-filtering may be a necessity in many instances. Ho

XDT User’s Manual Appendices49Appendix I: XDT Grounding Considerations1. The sensor ground is isolated from the signal and frame grounds, however it i

XDT User’s Manual Appendices50Appendix J: Analog Output vs. Dewpoint The current output of the XDT, varies with the measured dewpoint. To use the curr

XDT User’s Manual Appendices51-100°C to +20°C settings, because the 4-20mA provides sufficient resolution to measure the out-put better than the speci

XDT User’s Manual Appendices52Appendix K: RS-232C Interface ProtocolThe instrument uses a simple protocol to communicate to a host computer through it

XDT User’s ManualvTable of Contents1.0 Overview of the Dewpoint Transmitter model (DT)...12. S

XDT User’s Manual Appendices53The mode argument is optional and may be specified only if an interval was specified. It may be “N” for numeric reportin

XDT User’s Manual Appendices54The printer should have at least 80 character columns, and it is best to use continuous form paper.“?” commandRequests a

XDT User’s Manual Appendices55Appendix L: Procedure for Exchanging XDT SensorsTo exchange sensors one must know the measured low attenuation of the se

XDT User’s Manual Appendices56Appendix M: Uncertainty in LBS & ppmV calculationsUncertainty of LBS & ppmV calculations due to +/-3°C measureme

Appendix M: Return Authorization Number Request Form Xentaur Return Authorization Number Request Form • Xentaur must approve and assign a Return Aut

57Symbols°C ...17°F ...17AAC power voltag

Index58copper tubing ...6copyright ...icorrosive gases ...

59IndexNPL ...1Ooil ...3operating state .

Index60voltage, mains supply ...10Wwarning labels ... iiiwarranty ...

XDT User’s ManualviAppendix D: Optional Sensor Fittings...41Appendix

XENTAUR CORPORATION, 84F HORSEBLOCK ROAD, YAPHANK, NY 11980 U.S.A. TEL (631) 345-3434 FAX (631) 345-5349

Section 1: Introduction11.0 Overview of the XDTThe XDT is a microprocessor based hygrometer, for measuring moisture content in gases in the range from

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