Pressure Systems 9046 user manual Theory of Operation, Thermocouple Cold Junction Compensation

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Pressure Systems, Inc.

Model 9046 User’s Manual

 

 

For operation, the Model 9046 only requires 18 to 36 VDC (i=200mA), and the appropriate Ethernet interface.

1.1.3 Theory of Operation

The Model 9046 is a 32 channel analog multiplexer, controlled by a microprocessor. It communicates over an Ethernet TCP/IP or UDP interface. The module utilizes 16 small Signal Conditioning Modules (SCMs), which plug into a motherboard inside the module. There are two types:

•universal (thermocouple or resistance, set by jumper)

•thermocouple without open circuit detection

1.1.3.1 Thermocouple Cold Junction Compensation

To accomplish cold junction compensation, the thermocouple SCMs incorporate a precision temperature device located between the thermocouple input sockets. It is in close proximity (1/16” or 1.5 mm) to the actual contacts. This gives very precise junction temperature measurement, which contributes to the overall accuracy of the module.

Sixteen of the multiplexer channels are used to scan the embedded precision temperature devices. The processor then calculates the junction temperature. The temperature this precision temperature device reports (a voltage that will be referred to as Vb) is limit checked, and stored for use in the Engineering Unit (EU) calculation to compensate for junction temperature. Junction temperatures which deviate by a preset amount from the average of the other junction temperatures will issue an alarm to the external host. An alarm will also be issued if the absolute temperature of any junction exceeds the rated operating temperature of the 9046.

The thermocouple channels are then scanned, and the voltages used in the EU calculation. The EU calculation uses previously defined coefficients to determine thermocouple type, engineering unit, and calibration offset. The universal SCM incorporates the thermocouple and resistance circuitry in the same package. A jumper can be installed to tell the SCM to operate in the thermocouple mode. When the jumper is not installed, it will function in the resistance mode. In this mode, the Vb channel is internally connected to measure the voltage drop (Vb) across an internal precision resistor. The processor then solves for line current which is a result of an internal reference voltage being passed through the unknown resistance (RTD Thermistor, Resistor, etc.) Now that the current is known, and the Voltage (Va) is known, the resistance is calculated. By performing a table-lookup, or polynomial calculation, the proper engineering unit value is obtained and returned in a packet via the Ethernet connection.

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Contents Model Ethernet Intelligent Temperature Scanner User’s Manual Page Table of Contents Merchandise Return Procedures Our WarrantyOur Company Technical SupportWebsite and E-Mail Our Firmware Our Publication Disclaimer This page left intentionally blank Introduction GeneralIntroduction Exploded View of Module Physical DescriptionThermocouple Cold Junction Compensation Theory of OperationOpen Circuit Detection Setup InstructionsEquipment Required Network Dialog Box Computer PreparationTCP/IP Properties Dialog Box Cable Connections Module ConnectionPressure Systems, Inc Model 9046 User’s Manual Network Status Screen IP Address AssignmentNetwork Status after connection ConfigureNetwork Options Pulldown Menu Pressure Systems, Inc Model 9046 User’s Manual Set Sensor Type Sensor Type Values Read Sensor Type Thermocouple Reference Temperature AlarmsC05 Read Temperature Units Set Temperature UnitsWrite EU Filter Parameter V0110b ddV00152 U00152 Read EU Filter ParameterCalibration V00100 H0001U00100 W08Pressure Systems, Inc Model 9046 User’s Manual Sensor Type Gain Setting Engineering Va, Vb Units FirmwareDescription of Operation Thermocouple VoltageResistance ThermistorUpdating the Firmware This page intentionally blank Command Quick Reference Command SetPressure Systems, Inc.Model 9046 User’s Manual Summary Information About All Commands Pressure Systems, Inc Model 9046 User’s Manual Pressure Systems, Inc Model 9046 User’s Manual No Operation Command ’A’ Reset Command ’B’ Purpose Read Primary Transducer Volts Command ’V’Vppppf Dddd.. dddd999999 -4.989500 0.005390 V11110Read Primary Transducer A/D Counts Command ’a’ 32767.000000 -32700.000000 10.000000 A11110Aaaabbbbcccc..pppp Read Primary Transducer E. U. Data at High Speed Command ’b’Nuss does not use this command normally. You may execute it Define/Control Autonomous Host Streams Command ’c’ Pressure Systems, Inc Model 9046 User’s Manual Pressure Systems, Inc Model 9046 User’s Manual Pressure Systems, Inc Model 9046 User’s Manual Pressure Systems, Inc Model 9046 User’s Manual Read response 00 1 000F 0 1 7 0 c 00 2 00F0 0 2 7 0 c 00 3 FF00 0 4 7 Pressure Systems, Inc Model 9046 User’s Manual Command ’c’- Sub-command Index 01 Start Streams Example Space Command ’c’- Sub-command Index 02 Stop StreamsExample 02 0 c 03 3 c 01 Command ’c’- Sub-command Index 03 Clear StreamsPressure Systems, Inc Model 9046 User’s Manual Character Command ’c’ Sub-command Index 04 Return Stream InformationFfff 0 20 7 32000 1 7002 200.200.200.1 DescriptionPrefix/Data Groups Enable UTR Temperature/Other EU Data ûC Enable Primary Transducer Temperature/ResistanceEnable UTR Temperature/Other A/D Counts Enable UTR Temperature/Other Voltages05 1 Command c 06 st pro remport ipaddr 06 0 06 0 1Nuss does not normally use this command since it generates This page intentionally left blank Model 9046 Ethernet Interface Cable Appendix a Cable DiagramsModel 9046 Ethernet Interface Cable Headquarters/Factory European Office

9046 specifications

Pressure Systems 9046 is a highly advanced pressure management solution designed to cater to various industrial and commercial applications. Renowned for its robust performance and reliability, this system is engineered to optimize pressure levels in a wide range of environments, ensuring efficiency and safety in operations.

At its core, Pressure Systems 9046 integrates cutting-edge technologies that enhance its functionality and user experience. One of its main features is the Smart Pressure Regulation Technology (SPRT), which utilizes intelligent algorithms to automatically adjust and maintain optimal pressure levels. This ensures that processes run smoothly, minimizing the risk of pressure fluctuations that can lead to equipment damage or operational downtime.

Another standout characteristic of the Pressure Systems 9046 is its modular design. This allows for easy scalability and customization, enabling users to configure the system according to their specific needs. Whether addressing low-pressure applications or high-pressure requirements, the modular setup can adapt and expand, providing flexibility for various industrial settings.

In addition, the system is equipped with advanced monitoring capabilities. With real-time data tracking and reporting, operators can monitor pressure levels, detect anomalies, and analyze trends. This proactive approach to pressure management enhances operational efficiency, reduces costs, and ensures compliance with safety standards.

Durability is another hallmark of Pressure Systems 9046. Built with high-quality materials, it can withstand harsh environmental conditions, including extreme temperatures and corrosive substances. This robust construction not only extends the lifespan of the system but also reduces maintenance needs, offering long-term reliability.

Moreover, Pressure Systems 9046 supports remote monitoring features, allowing users to access system data and control operations from anywhere. This connectivity simplifies management tasks and contributes to a more streamlined workflow, enabling industries to focus on core operations while ensuring pressure systems are performing optimally.

In conclusion, Pressure Systems 9046 stands out due to its innovative technologies, user-friendly design, and exceptional durability. Its combination of smart pressure regulation, modularity, real-time monitoring, and remote access makes it an indispensable tool for various industries looking to enhance their pressure management strategies. As industries continue to evolve, Pressure Systems 9046 is poised to meet the changing demands of the market, ensuring safe and efficient operations for years to come.
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