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Chapter 6: Linear Scaling Examples CAS200 User’s Guide
88 Watlow Anafaze
Example 1: 4-20mA Sensor
Situation
A pressure sensor that generates a 4-20 milliamp signal is
connected to the scanner. The specifications of the sensor
state that it generates 4mA at 0.0 pounds per square inch
(psi) and 20mA at 50.0 psi.
Setup
The sensor is connected to a loop input set up with a
resistor scaling network to produce 60 millivolts at 20mA.
The INPUT TYPE for the loop is let to LINEAR. The sensor
measures psi in tenths, so the DISP FORMAT is set to
-999.9 TO +3000.0.
Table 6.1 Input Readings
The scaling values set up in the SETUP LOOP INPUT menu
are shown in Table 9.2.
Table 6.2 Scaling Values
Process
Variable
Displayed
Sensor
Input
Reading, Percent of
Full Scale (%FS)
50.0 psi 20mA 100%FS
0.0 psi 4mA 100% x (4mA/20mA) = 20%FS
Parameter Prompt Value
High Process Variable HIGH PV 50.0 psi
High Sensor Reading HIGH RDG 100.0%FS
Low Process Variable LO PV 0.0 psi
Low Sensor Reading LO RDG 20.0%FS
- User’s Guide 1
- Warranty 2
- Contents 3
- Using the CAS200 35 4
- Setup 41 4
- Setup Channel Inputs 50 5
- Setup Channel Alarms 58 5
- Contents CAS200 User’s Guide 6
- CAS200 User’s Guide Contents 7
- Watlow Anafaze v 7
- List of Figures 9
- 7 Specifications 91 10
- List of Tables 11
- System Overview 13
- Getting Started 14
- Product Features 15
- System Diagram 16
- Parts List 16
- Safety 17
- 6 Watlow Anafaze 18
- Installation 19
- Typical Installation 20
- External Safety Devices 21
- Mounting 22
- Mounting the Scanner 23
- 12 Watlow Anafaze 24
- Mounting the TB50 25
- System Wiring 26
- Wiring Recommendations 27
- Noise Suppression 28
- Avoiding RFI/EMI 29
- Ground Loops 30
- Power Connections 31
- CAS200 Power Supply 32
- Table 2.2 Power Connections 32
- NO" key while 33
- Input Wiring 34
- Thermocouple Connections 35
- Voltage Input Connections 36
- Current Input Connections 36
- Serial Communications 37
- EIA/TIA-485 Interface 38
- Cable Recommendations 39
- Connections 40
- Signal Common 40
- Termination 40
- Wiring Digital I/O 41
- Digital Outputs 42
- Alarm Output Connections 43
- CPU Watchdog 44
- Digital Inputs 44
- Watlow Anafaze 33 45
- Table 2.6 TB18 Connections 46
- Using the CAS200 47
- Front Panel Keys 48
- Watlow Anafaze 37 49
- Single Channel Display 50
- Job Display 50
- Change Setpoint 51
- Acknowledging an Alarm 52
- Resetting an Alarm 52
- Watlow Anafaze 41 53
- How to Edit a Menu 54
- Watlow Anafaze 43 55
- Passkey Sequence 55
- Single Channel Display 55
- Load a Job 56
- Save Setup to Job 57
- Job Select Inputs 57
- Job Select Input Polarity 58
- Startup Alarm Delay 58
- Keyboard Lock Status 59
- Scanner Address 59
- Communications Baud Rate 59
- Communications Protocol 60
- AC Line Frequency 61
- Digital Output Polarity 61
- Setup Channel Inputs 62
- Display Resolution 63
- Pulse Sample Time 64
- Channel Name 64
- Input Units 64
- Input Reading Offset 65
- Linear Scaling Menus 66
- Display Format 67
- High Process Value 68
- Input Scaling High Reading 68
- Input Scaling Low Reading 69
- Input Filter 69
- Setup Channel Alarms 70
- Watlow Anafaze 59 71
- Alarm Delay 72
- High Process Alarm Type 72
- Deviation Alarm Value 73
- High Deviation Alarm Type 73
- Low Deviation Alarm Type 74
- Low Process Alarm Setpoint 75
- Low Process Alarm Type 75
- Alarm Deadband 76
- Manual I/O Test 77
- Digital Output Test 78
- Keypad Test 78
- When There is a Problem 79
- Troubleshooting Scanners 80
- Thermocouple Break Alarm 81
- System Alarms 81
- Other Behaviors 82
- Low Power 83
- Battery Dead 83
- HW Ambient Failure 84
- HW Gain or Offset Failure 84
- Keys Do Not Respond 85
- Checking Analog Inputs 85
- Earth Grounding 86
- Testing Output Devices 87
- Testing the TB18 and TB50 87
- Testing Digital Outputs 87
- Supervised Systems 88
- Communications 89
- Ground Channels 90
- Software Problems 90
- NO-Key Reset 90
- Replacing the EPROM 91
- 80 Watlow Anafaze 92
- Changing Communications 93
- CAS200 Input Circuit 94
- CAS200 Current Inputs 95
- CAS200 Voltage Inputs 96
- Scaling and Calibration 97
- 86 Watlow Anafaze 98
- Linear Scaling Examples 99
- Example 1: 4-20mA Sensor 100
- Example 2: 0-5Vdc Sensor 101
- Example 3: Pulse Encoder 102
- Specifications 103
- Table 7.3 Physical Dimensions 104
- Dimensions 104
- Watlow Anafaze 93 105
- 94 Watlow Anafaze 106
- Figure 7.4 TB50 Dimensions 107
- Table 7.8 TB50 Connections 107
- SCSI Cable 108
- Inputs 110
- Table 7.12 Pulse Inputs 111
- Resolution 111
- Table 7.15 Digital Inputs 112
- Outputs 113
- Parameter Description 114
- CAS200 Power Supply 115
- 104 Watlow Anafaze 116
- Glossary 117
- Glossary CAS200 User’s Guide 118
- 106 Watlow Anafaze 118
- CAS200 User’s Guide Glossary 119
- Watlow Anafaze 107 119
- 108 Watlow Anafaze 120
- Watlow Anafaze 109 121
- 110 Watlow Anafaze 122
- Watlow Anafaze 111 123
- 112 Watlow Anafaze 124
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