Omega CNI8DV, CNI16D, CNI8C, CNI8DH, CNI32 manual 3 Two/Three/Four-Wire RTD, Ohm Wiring Hookup

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2.3.3 Two/Three/Four-Wire RTD

The figures below show the input connections and input connector jumpers (shown in bold lines) required to hookup a 2-, 3- or 4-wire RTD.

RTD (1000/500Ω

) 4-Wire

RTD (1000/500Ω ) 3-Wire

RTD (1000/500Ω ) 2-Wire

RTD (100Ω

) 4-Wire

RTD (100Ω ) 3-Wire

RTD (100Ω ) 2-Wire

Figure 2.6 a) RTD-1000 ohm and

b) RTD-100 ohm Wiring Hookup

500 ohm Wiring Hookup

 

The two-wireconnection is simplest method, but does not compensate for lead-wire temperature change and often requires calibration to cancel lead-wire resistance offset.

The three-wireconnection works best with RTD leads closely equal in resistance. The device measures the RTD, plus upper and lower lead drop voltage and the subtracts twice the measured drop in the lower supply current lead producing excellent lead-resistance cancellation for balanced measurements.

The four-wireRTD hookup is applicable to unbalanced lead resistance and enables the device to measure and subtract the lead voltage, which produces the best lead-resistance cancellation.

When configuring your controller, select RTD type and RTD value in the Input Type menu (see Part 3).

If the input wires of the meter get disconnected or broken, it will display +OPN “Input (+) Open” message except in case of 500/1000 Ω 2-wire RTD. In this case the display shows -OPN “Input (-) Open” message. For safety purpose you may want to set up your alarm to be triggered when input is open. See Alarm 1 & 2 chapters for details.

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Contents User’s Guide Servicing North America Table of Contents List of Tables List of FiguresTIP Description Part IntroductionEMC Considerations Safety ConsiderationsBefore You Begin Front Panel Part SetupRear Panel Connections PowerInput OptionMain Power Connections Fuse Requirement see specifications Electrical Installation Power ConnectionsThermocouple Thermocouple Wiring Hookup TC Wire Color ChartOhm Wiring Hookup 3 Two/Three/Four-Wire RTDProcess Voltage Process CurrentWithout Sensor Excitation Use copper conductors Wiring OutputsSnubber Circuits Wiring Hookup RS-232 Output Wiring Hookup b RS-485 Output Wiring Hookup8DH Dual Horizontal 8DV Dual Vertical Dual Display Color SetupUse a jumper for Green or RED, never leave S1 open Button Function in Configuration Mode Operation Configuration Mode IntroductionPart Turning your Controller On for the First TimeFlow Chart for ID and Setpoints Menu ConfigurationEntering Your NON-DEFAULT SETPOINT/ID Security ID Number Entering Your NON-DEFAULT Full Security ID NumberID Number Setpoint Set PointsEnter Configuration Menu Configuration MenuInput Type Menu Enter Input Type Menu Input Type ThermocoupleThermocouple Submenu Thermocouple TypesRTD Submenu Input Type RTDRTD Types RTD Value SubmenuInput Type Process Reading ConfigurationProcess Submenu Process TypesTemperature Unit Submenu Enter Reading Configuration MenuDecimal Point Submenu Filter Constant SubmenuINPUT/READING Scale and Offset Submenu Reading Configuration If Process was selectedRange Conversion Number Conversion TableEnter Alarm 1 Menu AlarmAlarm 1 ABSOLUTE/DEVIATION Submenu Alarm 1 ENABLE/DISABLE SubmenuAlarm 1 LATCH/UNLATCH Submenu Active Submenu Contact Closure SubmenuAlarm 1 LOW Value Submenu Alarm ENABLE/DISABLE AT Power onAlarm 1 HI Value Submenu Enter Analog Output Menu Analog Output RetransmissionCURRENT/VOLTAGE Submenu Analog Output ENABLE/DISABLE SubmenuReading OUTFor example Alarm 2 ENABLE/DISABLE Submenu Enter Alarm 2 MenuReading Adjust Submenu Loop Break ENABLE/DISABLE SubmenuLoop Break Time/Field Calibration Enter Loop Break Time MenuThermocouple Field Calibration Submenu Setpoint Deviation ENABLE/DISABLE SubmenuOutput Flow Chart for OutputSelf Submenu Enter Output 1 MenuMINIMUM/PERCENT LOW Submenu Control Type Output MAXIMUM/PERCENT High SubmenuAuto PID Submenu Action Type SubmenuAnti Integral Submenu Proportional Band Submenu Start Auto Tune PIDRate Setup Submenu Reset Setup SubmenuCycle Time Submenu Deadband Submenu Damping Factor SubmenuControl Type Submenu Enter Output 2 MenuAction Type Submenu Cycle Time Submenu Ramp & Soak Ramp ENABLE/DISABLE SubmenuEnter Ramp and Soak Menu Ramp Value Submenu Soak ENABLE/DISABLE SubmenuSoak Value Submenu ID Code Entering or Changing Your NON-DEFAULT ID CodeEnter ID Code Menu Full Security Level Submenu Entering or Changing Your Default ID CodeSETPOINT/ID Security Level Submenu Communication Option 13 Flow Chart for Communication OptionCommunication Parameters Submenu Enter Communication Option MenuBaud Submenu Parity SubmenuBUS Format Submenu Stop BIT SubmenuModbus Protocol Submenu Line Feed SubmenuCommunication Interface Standard Submenu Data Flow Mode SubmenuData Separation Character Submenu Data Format Submenu Alarm Status SubmenuMain Reading Submenu Peak Value SubmenuAddress Value Submenu Address Setup SubmenuTransmit Time Interval Submenu Transmit Time Interval Value SubmenuDisplay Color Selection Alarm 1 Display Color SubmenuEnter Display Color Selection Menu Normal Color Display SubmenuExample Alarm 2 Display Color SubmenuDisplay Colors change sequences Green RED AmberRED Green Nmrr Part SpecificationsCmrr ControlSSR Control Output 1Insulation ExcitationGeneral Input Type Range Accuracy Input PropertiesFactory preset value Part Factory Preset ValuesMenu Items Factory Preset Values Notes Measurement Category Part CE Approvals InformationPage Page Return REQUESTS/INQUIRIES WARRANTY/DISCLAIMERPRESSURE, Strain and Force TemperatureFLOW/LEVEL Data Acquisition

CNI16, CNI32, CNI8DH, CNI8C, CNI16D specifications

The Omega CNI series, including models CNI8DV, CNI8, CNI8DH, CNI32, and CNI16, represents a cutting-edge line of sensors designed for various industrial applications. Known for their reliability and versatile functionality, these sensors play a crucial role in monitoring and controlling multiple parameters in different environments.

The CNI8DV model is equipped with dual voltage outputs, enabling flexibility in integration with various systems. This feature allows users to choose between standard and high voltage operating conditions, making it suitable for a wide range of applications. Its high precision and quick response times deliver accurate measurements, essential for critical processes where timing and accuracy are paramount.

The CNI8 model offers robust performance with an extensive measurement range. This model is particularly noteworthy for its advanced signal processing technology, which improves measurement stability and accuracy. It utilizes digital filtering and calibration techniques to enhance performance and ensure consistent output, minimizing the effects of environmental fluctuations.

In the CNI8DH variant, enhanced durability is a key characteristic. This model features a more robust housing that protects it from harsh environmental conditions. It is designed to withstand high humidity, dust, and varying temperatures, making it suitable for outdoor applications or environments where exposure to elements is a concern. It also includes real-time diagnostics to monitor its operational health, allowing for proactive maintenance.

The CNI32 model stands out with its higher measurement capacity and greater flexibility in configurations. This sensor can handle multiple input types, including temperature, pressure, and flow rates. Its modular design allows users to customize it for specific applications, making it ideal for industries ranging from manufacturing to energy production.

The CNI16 model is designed for standard applications requiring precision and reliability. Its compact size allows for easy installation in tight spaces, while still delivering high performance. Enhanced connectivity options support integration with various data acquisition systems and industrial networks, enabling seamless data collection and monitoring.

In summary, the Omega CNI series exemplifies state-of-the-art sensor technology, offering a range of features that cater to diverse industrial needs. From versatile voltage outputs in the CNI8DV to the rugged design of the CNI8DH, each model is engineered to provide accurate, reliable readings with the ability to withstand challenging conditions. Whether for monitoring environmental conditions or precise measurements in manufacturing processes, the CNI series continues to be a top choice for professionals seeking high-quality sensors.
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