Spectrum-controls 1756sc-IF8u Manuale Utente Pagina 100
- Pagina / 118
- Indice
- RISOLUZIONE PROBLEMI
- SEGNALIBRI
Valutato. / 5. Basato su recensioni clienti
88 ControlLogix
™
Universal Analog Input Module
to 14.4% chromium, 1.3 to 1.6% silicon, plus small amounts (usually not
exceeding about 0.1%) of other elements such as magnesium, iron,
carbon, and cobalt. The negative thermoelement, NN, is an alloy that
typically contains about 95% nickel, 4.2 to 4.6% silicon, 0.5 to 1.5%
magnesium, plus minor impurities of iron, cobalt, manganese and carbon
totaling about 0.1 to 0.3%. The type NP and NN alloys were known
originally [16] as nicrosil and nisil, respectively.
The research reported in NBS Monograph 161 showed that the type N
thermocouple may be used down to liquid helium temperatures (about
4°K) but that its Seebeck coefficient becomes very small below 20°K. Its
Seebeck coefficient at 20°K is about 2.5uV/°K, roughly one-third that of
type E thermocouples which are the most suitable of the letter-designated
thermocouples types for measurements down to 20°K. Nevertheless,
types NP and NN thermoelements do have a relatively low thermal
conductivity and good resistance to corrosion in moist atmospheres at low
temperatures.
Type N thermocouples are best suited for use in oxidizing or inert
atmospheres. Their suggested upper temperature limit, when used in
conventional closed-end protecting tubes, is set at 1260°C by the ASTM
[7] for 3.25mm diameter thermoelements. Their maximum upper
temperature limit is defined by the melting temperature of the
thermoelements, which are nominally 1410°C for type NP and 1340°C for
type NN [5]. The thermoelectric stability and physical life of type N
thermocouples when used in air at elevated temperatures will depend upon
factors such as the temperature, the time at temperature, the diameter of
the thermoelements, and the conditions of use. Their thermoelectric
stability and oxidation resistance in air have been investigated and
compared with those of type K thermocouples by Burley [16], by Burley
and others [13,44-47], by Wang and Starr [17,43,48,49], by McLaren and
Murdock [33], by Bentley [19], and by Hess [50].
Type N thermocouples, in general, are subject to the same environmental
restrictions as types E and K. They are not recommended for use at high
temperatures in sulfurous, reducing, or alternately oxidizing and reducing
atmospheres unless suitably protected with protecting tubes. They also
should not be used in vacuum (at high temperatures) for extended times
because the chromium and silicon in the positive thermoelement, a nickel-
chromium-silicon alloy, vaporize out of solution and alter the calibration. In
addition, their use in atmospheres with low, but not negligible, oxygen
content is not recommended, since it can lead to changes in calibration due
to the preferential oxidation of chromium in the positive thermoelement.
Nevertheless, Wang and Starr [49] studied the performances of type N
thermocouples in reducing atmospheres, as well as in stagnant air, at
temperatures in the 870°C to 1180°C range and found them to be
markedly more stable thermoelectrically than type K thermocouples under
similar conditions.
- NIVERSAL 1
- Important Notes 3
- Terms & 6
- Abbreviations You 6
- Should Know 6
- Preface vii 7
- Table of Contents 9
- Module Overview 13
- Chapter 1 13
- Detailed 14
- Specifications 14
- Hardware Features 15
- Diagnostic LEDs 16
- System Overview 16
- System Operation 17
- Module Operation 17
- Compatibility with 18
- Thermocouple 18
- Current, and Millivolt 18
- Devices & Cables 18
- 8 ControlLogix 20
- Counter Module 20
- Chapter 2 21
- Requirements 22
- Module Installation 22
- 12 ControlLogix 24
- Wiring Your Module 26
- Preparing and 27
- Wiring the Cables 27
- Terminal Block 28
- Wiring Voltage/ 29
- Current Inputs the 29
- IF8u Module 29
- Wiring RTD or 30
- Resistance Sensors 30
- White (With Potted Sensor) 32
- White (No Sensor) 32
- 22 ControlLogix 34
- Operation Within the 35
- ControlLogix System 35
- 24 ControlLogix 36
- Requested Packet 37
- Interval (RPI) 37
- Modules in a 37
- Remote Chassis 37
- Listen-Only Mode 38
- Multiple Owners of 38
- Input Modules 38
- Configuration 39
- Changes in an 39
- Input Module with 39
- Multiple Owners 39
- 28 ControlLogix 40
- Chapter 4 41
- 30 ControlLogix 42
- 32 ControlLogix 44
- Configuring module 46
- Configuration Tags 46
- Status Tags 48
- Configuration, Data 49
- Chapter 5 49
- Global Module 50
- Settings 50
- -25 to +65 degC REAL 51
- 42 ControlLogix 54
- Channel Specific 55
- 44 ControlLogix 56
- 46 ControlLogix 58
- 48 ControlLogix 60
- Input Tags 62
- Fault and Status 62
- Reporting Tags 62
- 52 ControlLogix 64
- Module Data Tags 65
- 54 ControlLogix 66
- Programming Examples 67
- Chapter 6 67
- 56 ControlLogix 68
- Set Attribute All message: 70
- Module Reconfigure Message: 70
- 60 ControlLogix 72
- Chapter 7 73
- Troubleshooting 73
- Using RSLogix 5000 74
- Your Module 74
- Determining Fault Type 75
- Configuration Errors 76
- Maintaining Your Module 77
- And Ensuring Safety 77
- Chapter 8 77
- 68 ControlLogix 80
- Module Specifications 81
- Appendix A 81
- Thermocouple Descriptions 87
- Appendix B 87
- 76 ControlLogix 88
- Thermocouples 89
- 78 ControlLogix 90
- 80 ControlLogix 92
- 82 ControlLogix 94
- 88 ControlLogix 100
- References 102
- 92 ControlLogix 104
- 94 ControlLogix 106
- 96 ControlLogix 108
- Using Grounded Junction 109
- Junction Thermocouples 109
- Appendix C 109
- Isolation 110
- 100 ControlLogix 112
- Programming Your Module 113
- Appendix D 113
- 102 ControlLogix 114
- 104 ControlLogix 116
- Getting Technical 117
- Assistance 117
- Declaration of 117
- Conformity 117
Prodotti e manuali riguardandi Strumenti di misura Spectrum-controls 1756sc-IF8u
(186 pagine)Sealey Měřící nástroje uživatelské příručky
Seznam produktů Sealey Měřící nástroje obsahuje 59 uživatelské příručky pro 59 modelů. Všechny uživatelské příručky pdf jsou k dispozici ke stažení nebo prohlížení online.
Commenti su questo manuale