Epson XDT manual Hi **** ˚C, Start Calibration

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XDT User’s Manual

5. Push the MODE button. The display will show:

SET

HI **** ˚C

DEWPOINT

the ‘DEWPOINT’ indicator means that we are changing the alarm trigger dewpoint

6.

Push the UP or DOWN buttons until the display shows:

SET

HI

 

 

 

˚C

 

 

 

DEWPOINT

 

SET

*

 

7.

Push the MODE button. The display will show: HI

˚C

the Z indicates that we are changing the hysteresis of the alarm.

8. Push the UP or DOWN buttons until the display shows:

SET

HI

 

˚C

9.Push the MODE button until the instrument goes to the dewpoint display mode.

10.If it is desired to prevent inadvertent alarm settings changes by unauthorized people, acti- vate the Lockout.

The Alarm Relays switch on non-pressure corrected dewpoints. Thus enabling or disabling the pressure correction wil not effect the relays.

The instrument will retain the alarm settings even if the power is turned off.

Pressing the MODE button changes to the Start Calibration Mode.

3.4.4.3 Start Calibration

The instrument is calibrated at the factory with the sensor it is shipped with and does not need to be re-calibrated prior to installation.

The calibration mode allows two different types of calibrations.

•SpanCheck™: an Automatic Calibration using the sensor’s ability to saturate, thus no addi- tional materials or equipment are required, this calibration is most useful after long periods of usage and a suspicion of performance degradation.

•Single point calibration: the calibration curve derived from SpanCheck is modified at a single point using the output of the sensor as it is exposed to a gas with a known dewpoint. This cal- ibration is most useful when the sensor is exposed to hygroscopic substances which constantly alter the equilibrium between the sensor and the gas being measured (e.g. glycol), or when the sensor is exposed to corrosive gasses and may drift. If the known gas is chosen to be at a dew- point at or close to the critical measurement point of the process then an extreme accuracy of the process may be maintained even in the most harsh of applications.

In general we recommend to perform SpanCheck in 12 month intervals (not more often), and sin- gle point calibration as often as practically possible. When it is time to perform both calibrations, then first disable the single point calibration, then perform the SpanCheck calibration, then per- form the single point calibration. This procedure is not necessary but it is preferred when both cal- ibration are performed.

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Contents Yyyyyyy y Sensor Serial No Instrument Serial No XDT User’s Manual Iii XDT User’s Manual Table of Contents Index Overview of the XDT XDT User’s Manual Sensor and Sampling Techniques Precautions using the sensor Sensor Installation & Sampling Techniques Sensor Technical SpecificationsNot Recommended In-situ InstallationExtractive Installation Mechanical Installation SAT Troubleshooting unexpected readingsElectromagnetic Compatibility Considerations Instrument Precautions using the XDTIsolation Instrument Technical SpecificationsXDT-NEMA IP65 Enclosure Installation InstallationInstrument Mechanical Installation XDT-PM DIN43700 Enclosure InstallationElectrical Connections Connecting PowerSensor Connection AC Mains Electrical Power ConnectionLow Voltage DC Powered Option Electrical Power Connection Wiring the Alarm ContactsInterfacing to the Analog Output Operating the Instrument Interfacing to the RS-232 optionStarting up Display Conventions 12 3 4 5 6 7 8Push Buttons Operating State Viewing Dewpoint ModeXDT User’s Manual Alarms Start Calibration HI **** ˚CSpanCheck Mode Single Point Self Calibration, manual or scheduled Instrument XDT User’s Manual SetUp State Viewing Serial Number ModeXDT User’s Manual Secured Password Protection Resetable Audio-Visual Alarm Option Nfpa compliant Troubleshooting the Instrument Display Explanation Required Action Maintenance XDT User’s Manual Glossary DB9 Glossary XDT User’s Manual Sign on message Calibration without key press Appendix a Flow Diagram of Operating State User InterfaceHere 16.24˚C˚F Appendix B Flow Diagram of Set-Up State User InterfaceSensor Mechanical AppendixAppendix D Optional Sensor Fittings Side View Appendix E XDT Circuit Board DimensionsAppendix E XDT-PM Enclosure Mounting Dimensions Appendix E XDT-NEMA Enclosure Mounting Dimensions Appendix F Sensor/SpanCheck Theory of Operation Appendix G Dewpoint Response time Analysis XDT User’s Manual Appendices Tested Instrument ˚C Appendix H Sample Gas Filter ConsiderationsSensor Appendix I XDT Grounding ConsiderationsAppendix J Analog Output vs. Dewpoint Instrument reading in ppmV Help command Receive Help Data Who Reset Login Data commandAppendix K RS-232C Interface Protocol K n m Error SensOpen or Error SensShort or Error SensSatLogin Command ? commandSerial Number Command Who CommandState User Interface Appendix L Procedure for Exchanging XDT SensorsAppendix M Uncertainty in LBS & ppmV calculations To obtain a RAN fill out this form and fax to 631 Xentaur Return Authorization Number Request FormPage Index Enclosure dimensions Pounds of H2O per million standard cubic Voltage, mains supply Iii Warranty
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