Siemens SITRANS P Instruções de Operação Página 79
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C 14 bar process pressure is created.
Use the [M] button to set the transmitter to mode 3. To set the full scale value, press the
[↑] and [↓] buttons simultaneously for 2 seconds.
If there is 14 bar input pressure, the transmitter produces an output current of 20 mA.
D The output current can be calculated for any input pressure using the "current calculation
formula for setting".
Note
If
the value exceeds or falls below the preset measuring limits by more than 20% when setting,
the setting function is not carried out. The old value is retained in this case.
With a marked elevation of the zero point, the full scale value must therefore previously be
reduced such that it still lies within the permitted range after elevation of the zero point. This
setting function is only possible in "Pressure" measuring mode.
Adjusting with reference pressure
Condition:
The reference pressure, the adjusted start of scale value and adjusted full scale value are
known.
When
adjusting, a start of scale value or a full scale value can be allocated to a desired current
value with the aid of a reference pressure. This function is particularly suitable when the
required pressures for the start of scale value and the full scale value are not available After
adjustment, the measuring range specified on the nameplate may no longer correspond to the
setting made.
Using the formulae below, the current to be set for the desired start of scale value and the full
scale value can be calculated.
To calculate the output currents when setting the start of scale value or the full scale value,
the reference pressure must be selected such that a value between 4 and 20 mA results for
the current.
,
S0
$
0(0$
P$P$
,
0(
S
UH
I
0$
WDUJHW
0(
WDUJHW
0$
WDUJHW
P$P$
I Output current MA
actual
Old start of scale value
I
MA
Current to be adjusted with MA
target
ME
actual
Old full scale value
I
ME
Current to be adjusted with ME
target
MA
target
New start of scale value
p Pressure ME
target
New full scale value
p
ref
Existing reference pressure
Figure 6-7 Current calculation formula for setting with reference pressure
Operation
6.5 Local operation
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 77
- Pressure transmitter 1
- Table of contents 10
- 1.4 Scope of the instructions 12
- 1.5 Checking the consignment 12
- 1.7 Notes on warranty 13
- Safety instructions 15
- 2.2 Use in hazardous areas 16
- 3.2 Application range 20
- 3.3 Structure 21
- 3.4 Nameplate layout 23
- SITRANS P 24
- 3.6 Functional principle 25
- Overview 26
- 3.7 Remote seal 33
- 3.8 SIMATIC PDM 33
- Installing/mounting 35
- 4.1 Basic safety instructions 36
- ① Flameproof joint 37
- 4.1.2 Proper mounting 40
- 4.2 Disassembly 41
- Installation configuration 42
- 4.3.3 Fastening 43
- Requirements 45
- 4.4.2 Installation for level 46
- Assembly on an open container 47
- 4.7 Rotating the display 57
- Connecting 59
- 5.1 Basic safety instructions 60
- Connecting the device 62
- Closing the device 63
- 5.3 Connecting the Han plug 64
- ④ Shrink sleeve 66
- ② Positioning catch 66
- Operation 67
- Basic safety instructions 68
- 6.4 Display 69
- 6.4.2 Units display 70
- 6.4.3 Error display 71
- 6.4.4 Mode display 72
- 6.4.5 Status display 72
- 6.4.6 Overflow range 73
- 6.5 Local operation 74
- Operating functions 75
- 6.5.2 Operation using buttons 76
- Setting start of scale value 81
- Adjusting full scale value 83
- Differences 85
- Blind adjusting 85
- Example of blind adjusting 85
- 6.5.6 Trimming the zero point 89
- 6.5.7 Current transmitter 90
- Releasing key lock 93
- Variable application point 94
- Fixed application point 94
- 6.5.12 Measured value display 96
- 6.5.13 Unit 97
- Condition 101
- Introduction 101
- Fundamental description 101
- See also 101
- 7.2 Process tag data 102
- 7.3.2 Measuring mode selector 103
- 7.3.3 Variable mapper 103
- Description 105
- DV Device variable 106
- MA Start of scale value 106
- ME Full scale value 106
- 7.3.9 Measured value status 112
- UNCERTAIN status 113
- HIGH LIMIT and LOW LIMIT 113
- Change in status 113
- LIMIT are swapped around 115
- 7.3.10 Analog output 116
- Procedure 119
- 7.7 Electrical damping 120
- 7.8 Fast response mode 120
- 7.9 Current sensor 120
- 7.10 Fault current 120
- Lock options 122
- 7.13 Measured value display 123
- 7.15 Bar graph 125
- 7.16 Sensor calibration 125
- Current sensor trim 126
- Factory calibration 127
- Static configuration data 128
- 7.21 Diagnostic functions 130
- &DOLEUDWLRQLQWHUYDO 131
- 6WDELOLW\PRQWK 131
- 3UHVVXUHFXUYH 132
- 8SSHUGUDJLQGLFDWRUSRLQW 132
- /RZHUGUDJLQGLFDWRUSRLQW 132
- 7.21.5 Limit modules 133
- 7.22 Simulation 135
- 7.23 Limit monitor 136
- Functional safety 139
- Operational reliability 141
- 8.2.1 Safety function 142
- 8.2.2 Settings 142
- 8.2.3 Requirements 143
- 8.2.5 Maintenance/Checking 144
- 8.2.6 Safety characteristics 144
- 8.3.1 Safety function 145
- 8.3.2 Requirements 146
- 8.3.3 Settings 147
- 8.3.5 Maintenance/Checking 148
- 8.4 Add-on parts 149
- Commissioning 151
- Requirement 155
- Service and maintenance 161
- 10.2.2 Checking the gaskets 165
- 10.3 Cleaning 166
- Cleaning the enclosure 167
- 10.4 Return procedure 168
- 10.5 Disposal 168
- Technical data 171
- 11.2 Input point 172
- 11.3 Output 179
- 11.4 Measuring accuracy 179
- 11.5 Operating conditions 185
- 11.6 Construction 189
- 11.9 HART communication 196
- Dimension drawings 197
- ① Key cover ⑤ Connection side 204
- 12.4.1 Note 3A and EHDG 205
- Flanges as per ASME 206
- Connections as per DIN 206
- Other connections 208
- BioConnect 208
- connectors 208
- 12.4.4 PMC Style 210
- 12.4.5 Special connections 211
- IDF connectors 212
- Spare parts/accessories 213
- 13.1 Order data 214
- Appendix 217
- A.3 Literature and catalogs 218
- A.5 Technical support 222
- List of abbreviations 223
- B.1 Functional safety 224
- Glossary 225
- Failure/Fault 226
- Frequency shift keying 226
- $( 234
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