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Table of Contents
3-2-4 Sealed Tank (Wet Leg) Liquid Level Measurement .............................3-18
3-3 Measurement Using the JTG/JTA Model ...........................................3-22
3-3-1 Pressure Measurement ....................................................3-22
3-3-2 Liquid Level Measurement .................................................3-26
3-4 Measurement Using the JTC Model ................................................3-29
3-4-1 Liquid Level Measurement .................................................3-29
3-5 Measurement Using the JTE Model ................................................3-32
3-5-1 Liquid Level Measurement .................................................3-32
3-5-2 Flow Rate Measurement ...................................................3-34
3-6 Measurement Using the JTH/JTS Model ............................................3-35
3-6-1 Liquid Level and Pressure Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35
3-7
Zero Adjustment Based on Actual Level During Liquid Level Measurement .................3-38
3-8 Zero/Span Adjustment Based on Range-Equivalent Input Pressure .....................3-38
3-9 External Zero Adjustment (Optional Function) .....................................3-39
3-10 Calculating the Setting Range During Liquid Level Measurement .....................3-41
3-10-1 Open Tank and Sealed Tank (Dry Leg or Remote Seal) Setting Range ..........3-41
3-10-2 Sealed Tank (Wet Leg or Remote Seal) Setting Range ..........................3-51
3-11 Advanced Diagnostics (optional ) ................................................3-59
3-11-1 Pressure Frequency Index .................................................3-59
3-11-2 Standard Deviation .......................................................3-63
3-11-3 Out-of-Range Pressure Event Count ........................................3-65
Chapter 4 Maintenance and Troubleshooting of this Device .................4-1
4-1 Assembly and Disassembly of this Device ............................................4-1
4-1-1 Cautions During Assembly and Disassembly ...................................4-1
4-1-2 Attaching and Detaching the Case Cover ......................................4-2
4-1-3 Attaching and Detaching the Main Unit Cover (JTD, JTG, JTA, and JTC) ..........4-3
4-1-4 Cleaning the Device ........................................................4-5
4-1-5 Replacement of Electronics Module ..........................................4-5
4-2 Calibration of the Setting Range and Output Signal ...................................4-9
4-2-1 Setting Range Calibration Using a Reference Input Device .......................4-9
4-2-2 Output Signal Calibration ..................................................4-11
4-3 Calibration Value Restoration and History Functions .................................4-12
4-3-1 Restoring the Factory Calibration Value ......................................4-12
4-3-2 Diagnostics History Display ................................................4-12
4-3-3 Zero Calibration Internal Data ..............................................4-14
4-4 Troubleshooting ................................................................4-15
4-5 Insulation Resistance Test and Withstand Voltage Test ................................4-20
Appendix A ............................................................. A-1
A1
Diagnosis of clogging in the connecting pipe using the pressure frequency index
..A-1
A1-1 Principle ......................................................................A-1
A2 Configuration using a pressure gauge ................................. A-3
A2-1 Clogging and the pressure frequency index .........................................A-3
A2-2 Points to note regarding the diagnosis of clogging ...................................A-3
A2-3 Parameter configuration procedures ...............................................A-4
A2-4 Configuration procedures ........................................................A-5
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