Astar HT-3300 Specifikace Strana 114
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Hodnocené. / 5. Na základě hodnocení zákazníků
104
Reference Manual
00809-0100-4811, Rev DA
Section 6: Service and Troubleshooting
January 2015
Service and Troubleshooting
6.3.4 Amplitude threshold settings
The amplitude thresholds are automatically adjusted to appropriate values in order to filter out
noise and other non-valid measurements from the measurement signal.
The amplitude of the measurement signal, i.e. the amplitude of the signal that is reflected by
the product surface, is related to the actual dielectric constant of the product. The amplitude
threshold that is used by the transmitter is based on the parameter configuration of the current
product dielectric constant (see Basic Configuration/Start-Up ). Normally, no other threshold
adjustment is needed, but if the transmitter still does not track the product surface correctly, it
may be necessary to adjust the threshold values.
The RCT has a plot function allowing you to view the reflections along the probe.
If the amplitude threshold is too high the product level is not detected, as illustrated in
Figure 6-10.
Figure 6-10. Example 1: Amplitude Threshold T2 is Too High
If there are disturbing objects in the tank, the threshold must be carefully set in order to avoid
locking on the wrong amplitude peak. In Figure 6-11, the transmitter is locked on a peak above
the actual product surface, that is a disturbance was interpreted as the product surface,
whereas the actual product surface was interpreted as an interface or the probe end.
Figure 6-11. Example 2: Amplitude Threshold T2 is Too Low
P1
T1
T2
T3
Amplitude
100
80
60
-60
40
-40
20
-20
0
100
50
0
150
200
250
-
-
T2 is above the Level peak
P1
P2
P3
T1
T2
T3
Amplitude
100
80
60
-60
40
-40
20
-20
0
100
50
0
150
200
250
Actual surface
Disturbing echo
misinterpreted as
product surface
- Rosemount 3300 Series 1
- Guided Wave Radar Level and 3
- Interface Transmitters 3
- 5Section 5: Operation 7
- BAppendix A: Reference Data 8
- 00809-0100-4811, Rev DA 10
- January 2015 10
- Contents 10
- Section 1 Introduction 11
- 1 316L SST (EN 1.4404) 12
- 2 Alloy C-276 (UNS N10276) 12
- 3 Alloy 400 (UNS N04400) 12
- H Alloy C-276 (UNS N10276) 12
- D Duplex process connection 12
- 1.2 Manual overview 14
- 1.3 Service support 15
- Section 1: Introduction 16
- Introduction 16
- 2.1 Theory of operation 17
- 2.2 Application examples 18
- Separator tanks 19
- Underground tanks 19
- 2.3 System architecture 20
- 2.4 Process characteristics 21
- 2.4.6 Interface 22
- 2.5 Vessel characteristics 23
- 2.5.2 Tank shape 24
- 2.7 Probe selection guide 25
- 2.7.1 Transition zones 26
- Section 3 Installation 27
- 3.2 Installation procedure 29
- 3.3 Before you install 30
- Alarm output 31
- Write protection 31
- 3.4 Mounting considerations 32
- Flange connection on nozzles 33
- Flexible single lead 35
- Rigid twin lead 35
- Flexible twin lead 35
- 3.4.4 Free space 36
- 12 in. (300 mm) 37
- 3.4.6 Insulated tanks 38
- 3.5 Mechanical installation 39
- 3.5.5 Shortening the probe 43
- Pipes longer than 45
- Pipes shorter than 45
- 3.5.6 Using a segmented probe 46
- Verify probe length 47
- Assemble the segmented probe 47
- Hand tighten 49
- Flange Tri-Clamp Threaded 53
- Continue with step (7) 54
- 3.5.8 Anchoring 57
- Ø 0.3 in. (8 mm) 58
- 3.6 Electrical installation 62
- 3.6.3 Cable selection 63
- 3.6.4 Hazardous areas 63
- 3.6.5 HART 63
- Connecting the transmitter 65
- Non-intrinsically safe output 66
- Intrinsically safe output 67
- 3.7 Optional devices 68
- 4.1 Safety messages 71
- 4.2 Configuration parameters 72
- Reference gauge height 73
- Probe length 73
- Probe type 73
- Dielectric constant of vapor 73
- 4.2.2 Volume configuration 74
- Strapping table 75
- Standard tank shapes 76
- 4.4 Basic configuration 79
- 4.4.2 Measurement units 80
- 4.4.3 Reference gauge height 80
- 4.4.4 Probe length 80
- 4.4.5 Probe type 80
- 4.4.6 Product dielectric 81
- 4.4.7 Vapor dielectric 81
- 4.4.8 Measurement mode 81
- 4.4.9 Probe angle 82
- 4.4.11 Damping 82
- 4.4.12 Display panel 82
- 4.4.13 4 and 20 mA points 83
- 4.5 Volume configuration 84
- 4.6.2 Specifying the COM port 85
- 4.6.3 Help in RCT 86
- 4.6.4 Using the Setup Wizard 86
- 4.6.6 Setup - Info 89
- 4.6.7 Setup - Basics 89
- 4.6.8 Setup - Output 90
- 4.6.9 Setup - Probe 91
- 4.6.10 Setup - Geometry 92
- Dielectrics 93
- 4.6.11 Setup - Volume 94
- 4.6.12 Setup - Display 95
- 4.7 Special functions 97
- To turn off the Burst Mode 99
- To set the COM port buffers 99
- Reference Manual 100
- Basic Configuration/Start-Up 100
- Section 5 Operation 101
- 5.2 Error messages 102
- 6.1 Safety messages 103
- 6.2 Advanced configuration 104
- Upper Null Zone 105
- Logging and saving to disk 106
- 6.2.4 High level rates 108
- 6.3 Service 110
- Distance calibration 111
- Level calibration 111
- Changing the Upper Null Zone 112
- Using the Field Communicator 116
- Saving the log to disk 117
- Save Setup 118
- File name 118
- To load a setup 119
- Memory Map 119
- FLANGE VERSION 120
- THREADED VERSION 120
- 6.3.8 Changing the probe 121
- 6.4 Diagnostic messages 122
- 6.4.2 Errors 123
- 6.4.3 Warnings 124
- Appendix A Reference Data 125
- A.1.2 4–20 mA HART 126
- (output option code H) 126
- A.1.3 Output 126
- ™ adapter 127
- External power supply 127
- IS electrical parameters 127
- Signal on alarm 128
- Saturation levels 128
- Load limitations 128
- A.1.4 Modbus 129
- (output option code M) 129
- Remote display 131
- Configuration tools 131
- Output units 132
- Output variables 132
- A.1.6 Temperature limits 133
- A.1.8 Interface measurements 134
- A.2 Performance specification 136
- “Dimensional drawings” 137
- Interface measuring range 139
- A.2.3 Environment 140
- 500 cP 1500 cP 8000 cP 141
- A.3 Physical specification 142
- Remote housing mounting 143
- Tank connection 143
- Flange dimensions 143
- Vented flanges 144
- Probe versions 144
- Total probe length 144
- Engineered solutions 147
- Rosemount 9901 chamber 147
- Existing chamber 148
- Centering discs 149
- A.4 Dimensional drawings 152
- Appendix A: Reference Data 153
- Reference Data 153
- Figure A-30. Bracket Mounting 159
- Figure A-31. Remote Housing 160
- A.5 Proprietary flanges 161
- A.6 Ordering information 162
- HART modem and cables 168
- B.1 Safety messages 169
- B.2 EU Conformity 170
- Factory Mutual (FM) approvals 171
- °C to + 85°C 172
- °C to + 70 °C 172
- = 250 V 173
- 00809-0100-4570, Rev AC 174
- B.3.3 EAC certifications 176
- NCC/INMETRO Approvals 177
- B.3.5 Chinese certifications 179
- B.3.6 Japanese certifications 179
- B.3.7 IECEx certifications 180
- 60 °C) IP66 181
- B.4 Other certifications 182
- B.5 Approval drawings 182
- 9150 077-944 183
- 9150077-945 184
- Product Certifications 185
- to Modbus 187
- Converter 187
- C.2 Introduction 188
- C.3 Workflow 189
- C.4 Mechanical installation 189
- C.5 Electrical installation 190
- C.5.1 Connection terminals 191
- C.5.2 RS-485 bus 192
- C.5.3 Installation cases 192
- Star topology 194
- C.7 Transmitter configuration 196
- Modbus Setup 197
- Baud Rate 9600 200
- Start Bits One 200
- Data Bits Seven 200
- Parity None 200
- Stop Bits One 200
- C.9 Alarm handling 203
- C.9.1 Verify alarm output 204
- C.10.1 Input registers 206
- Measurement units 208
- Baud rate 209
- Floating Point Format Code 209
- RTU Data Type 209
- Input Register Base Number 209
- + 8 to + 30 Vdc 211
- (max. rating) 211
- C.12 Troubleshooting 214
- Checksum 217
- C.14 Specifications 218
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