Yokogawa digitalYEWFLO (DY) User Manual download pdf (Page 3)

TABLE OF CONTENTS

IM 1F2B4-01-YIA

IV. MAINTENANCE ...................................................................................................... 58

4.1 How to ........................................................................................................... 58

4.1.1 Communicating with the YEWFLO remotely ..................................... 59

4.1.2 Adjusting zero and span ..................................................................... 60

4.1.3 Using self-diagnostics ........................................................................ 61

4.1.4 Simulating an output/performing a loop check.................................... 62

4.1.5 Changing the output mode to analog or pulse ..................................... 63

4.1.6 Increasing gas and steam flow measurement accuracy by correcting

for gas expansion ............................................................................... 64

4.1.7 Activating Reynolds number correction.............................................. 65

4.1.8 Activating mismatched pipe schedule (bore) correction ...................... 66

4.1.9 Setting up and resetting the internal totalizer ...................................... 67

4.1.10 Scaling the pulse output ..................................................................... 68

4.1.11 Setting up user defined flow units ...................................................... 69

4.1.12 Setting up the local LCD indicator display mode ................................ 70

4.1.13 Setting the low cut flowrate ................................................................ 71

4.1.14 Trimming the 4-20 mA analog output ................................................. 72

4.1.15 Using the upload/download feature .................................................... 74

4.2 Disassembly and Reassembly.......................................................................... 75

4.2.1 Indicator/Totalizer removal ................................................................ 75

4.2.2 Amplifier replacement ........................................................................ 75

4.3 Vortex Shedder Assembly Removal ................................................................ 76

4.3.1 Removal of shedder from remote converter type................................. 76

4.3.2 Removal of the shedder from integral type ......................................... 77

4.4 Reassembly Cautions ...................................................................................... 78

4.4.1 YEWFLO shedder bolt torque procedures .......................................... 78

4.5 YEWFLO Style "E" Amplifier Calibration Procedure ..................................... 81

4.5.1 General amplifier checkout ................................................................ 82

4.5.2 Analog output test .............................................................................. 82

4.5.3 Pulse output test ................................................................................. 83

V. PARAMETER SETTING/CONFIGURATION ....................................................... 84

5.1 Notes on the TBL optional digital display ....................................................... 84

5.1.1 Display contents in display section ..................................................... 85

VI. TROUBLESHOOTING ............................................................................................ 88

6.1 Error Code Listing .......................................................................................... 88

6.2 Operating Procedures...................................................................................... 89

6.3 Flow Computation .......................................................................................... 92

6.3.1 Variable definitions ............................................................................ 92

6.3.2 Flow conversion factor ....................................................................... 93

6.4 Signal Conditioning ........................................................................................ 94

6.4.1 YEWFLO Style "E" signal adjustment procedure ............................... 94

6.4.2 Problem solving ................................................................................. 94

6.4.3 Piping checkout procedure ................................................................. 94

6.4.4 Noise balance adjustment ................................................................... 95

6.4.5 Noise judge ........................................................................................ 96

6.4.6 TLA adjustment ................................................................................. 96

6.4.7 Low-cut flowrate adjustment .............................................................. 97

6.4.8 High-frequency filter adjustment ........................................................ 97

6.5 Flowcharts ...................................................................................................... 98

6.5.1 No flowmeter output under flowing conditions................................... 98

6.5.2 Flowmeter output with no flow......................................................... 100

6.5.3 Large flowmeter errors ..................................................................... 101

6.5.4 Output is unstable when flowrate is low ........................................... 102

1 2 3 4 5 6 7 8 ... 125 126

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Yokogawa digitalYEWFLO (DY) User Manual Page 3

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