K-Tec MT2000 manual Appendices, Appendix a Sensor Trim

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9. APPENDICES

9.1APPENDIX A: Sensor Trim

Sensor trim is preset at the factory for a specific type of probe, installation and application condition. Re-trimming in the field should not be necessary unless a major change in antenna length (+/- 40%) is required.

Low Trim Point LTP and High Trim Point HTP are the points used to define the measuring range of the unit. The lin- ear value (in engineering units) and the corresponding “raw counts,” representing that location, are stored in the module can now for each trim point. The module determine the level measurement on the sensing probe based on these trim points established.

CAUTION: Changing LTP or HTP will clear the linearization table points since it consists of re-ranging the instrument.

To access the Sensor Trim menu, press the ‘UP’ and ‘DOWN’ buttons together, when the LCD display is on ‘END’, at the end of the CFG menu

Sensor trim in the field should be avoided if at all possible. This is because:

•It is difficult to “see” or know the exact conditions that the MT2000 is reading in the field without controlled condi- tions on the probe and an oscilloscope to confirm them. The MT2000 has no way of discerning whether or not the information it is reading is correct. If trimmed to incorrect conditions, the transmitter measurement may be dramatically incorrect.

•Different types of probes require different styles of gain settings. Coaxial probes and single rod or cable probes in an EC chamber require different gain and calibration fixtures than single rods or cables in an open vessel.

•If the Sensor Trim point settings LTP or HTP are entered accidentally, the only way to exit this selection without making any changes is to remove power from the transmitter. DO NOT STEP THROUGH THE TRIM DIGITS.

If re-trimming the MT2000 is necessary, please consult the factory for instruction.

Performing the Sensor Trim: if the level can be raised and lowered AND the actual level is known:

1.With the unit powered up, bring the product to a known level about 6 inches above the minimum level.

2.Using the LCD menu, access LTP. Use the “Select” and ‘UP and ‘DOWN’ buttons to set the value to the engi- neering value of the actual level in the selected engineering units.

3.Bring the product to a known level about 10 inches below the maximum level.

4.Using the LCD menu, access HTP. Use the “Select” and ‘UP and ‘DOWN’ buttons to set the value to the engi- neering value of the actual level in the current units.

The engineering unit measurement can be set with a zero reference at any point on the probe. Example 1, below, illustrates how the factory default setup is configured. Example 2 provides an inverted sensor setup if it is desirable.

HTP = 19.5’

 

LTP = 1’

 

LL

20’20’

H

LTP = .5’

H

 

HTP = 19.5’

 

 

 

 

 

MT2000-0200-1 Rev f (10-2007) DCN0160

Figure 9.1

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Contents Guided Wave Radar Level Transmitter Table of Contents Appendices List of FiguresIntroduction Measurement cycle consists of the following Ambient TemperatureOverview Storage InformationUltra Low Dielectric ULD Measure Method Direct Reflect Mode standard cont’dMounting Requirements InstallationURV = Probe Length LRV = 0 in. / 0 mm Factory Default ConfigurationShortening of Probe MT2000 Guided Wave Radar GuidelinesMT2000 Guided Wave Radar Guidelines cont’d WiringQuickstart Procedure CommissioningSetting the 4mA and 20 mA Points Using the Pushbutton Menu Quickstart Procedure cont’dVerify Proper Power-Up Calibration Menu LCD Menu OperationThreshold Level Parameter THV and Gain Setting GS Detailed Configuration Parameters Direct Mode Blanking MenuL1O Threshold Level Parameter THV and Gain Setting GS cont’dAdvanced Parameter Settings KO & KG Advanced Parameter Settings cont’dDC = I + H L / H2 Ultra Low Dielectric ULD Mode Configuration= H * Sqrt DC H + L DAC TrimFigure Ultra Low Dielectric ULD Mode Configuration cont’dAdvanced Output Configuration Setting the DAC trimBench Calibration of the 4mA & 20mA Points 6 4mA & 20mA Calibration Using Actual Level InputJumper Switch Settings Reversing The Output Action Using Actual Level InputValid Current Loop Outputs Troubleshooting InformationPossible Symptoms Interoperability and Conformance Class Possible Symptoms cont’dElectronics Module Replacement Honeywell DE Output OptionCompatibility Hart Protocol Interface OptionOperating Modes Hart CommunicatorLRV Glossary of TermsAppendix a Sensor Trim AppendicesEND CFG Menu Configuration 2 Hidden MenuTMP To clear the linearization table To access the linearization tableSetting up Linearization Table Points Appendix C LinearizationMT2000 Interface Appendix D Interface ApplicationsChannel B Use and setup of the oscilloscope for the MT2000Scope Settings Channel a PrerequisitesAppendix F CE Certificate of Conformity Appendix G Exida Certificate MT2000-0200-1 Rev f 10-2007 DCN0160 MT2000-0200-01 Rev f 10-2007 DCN0160 MT2000-0200-1 Rev f 10-2007 DCN0160 10b Appendix I Mounting Configurations3a, 3b 10aYear Warranty for Appendix J Warranty Statement
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