Scanner 1141 Hardware User Manual
106
RTD Inputs
RTD inputs use a precision current source to measure the resistance of the RTD. Lead length
compensation of the 3-wire RTD is accomplished by measuring the line resistance between terminals
C1 and C2. The multiplexer, A/D converter and autocal are the same as the analog inputs. Each
RTD input can be firmware-configured as two analog inputs.
Pulse Inputs
The Scanner 1141 optional pulse inputs are designed to interface with a wide variety of devices
including variable-reluctance magnetic pick-up coils, and signals from turbine preamplifiers and
simple contact closures. DIP switches select the type of signal to be used for each pulse input.
In all modes, the pulses are accumulated in a hardware register that is periodically read by the
microprocessor in the CPU. The pulse count is used directly in volume calculations. The frequency
(used to determine flow rate) is calculated using the time interval between successive pulses.
Summary of Contents for NUFLO 1141C
Page 1: ...Manual No 30165009 Rev 01 NUFLOTM Scanner 1141 RTU Hardware User Manual ...
Page 28: ...Scanner 1141 Hardware User Manual 28 Figure 3 1 Scanner 1141 main circuit board ...
Page 66: ...Scanner 1141 Hardware User Manual 66 ...
Page 67: ...Chapter 6 Parts List and Order Code 67 Chapter 6 Parts List and Order Code Scanner 1141C ...
Page 68: ...Scanner 1141 Hardware User Manual 68 Scanner 1141L ...
Page 69: ...Chapter 6 Parts List and Order Code 69 Scanner 1141G ...
Page 91: ...Appendix A Specifications 91 Outline Dimensions Scanner 1141C ...
Page 92: ...Scanner 1141 Hardware User Manual 92 Scanner 1141L Front and Side Views ...
Page 94: ...Scanner 1141 Hardware User Manual 94 Scanner 1141G ...
Page 96: ...Scanner 1141 Hardware User Manual 96 Drawing 1 Installation ...
Page 97: ...Appendix B Control Drawings 97 Drawing 2 Power Supply ...
Page 98: ...Scanner 1141 Hardware User Manual 98 Drawing 3 Communications Serial Ports ...
Page 99: ...Appendix B Control Drawings 99 Drawing 4 Status Pulse Inputs Outputs ...
Page 100: ...Scanner 1141 Hardware User Manual 100 Drawing 5 RTD Inputs Analog Inputs Outputs ...
Page 101: ...Appendix B Control Drawings 101 Drawing 6 Analog Outputs ...
Page 102: ...Scanner 1141 Hardware User Manual 102 ...
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