Dual input temperature transmitters
Moore Industries’ THZ3 and TDZ3 are Smart HART temperature transmitters that are designed to increase usability and functionality, and include a dual sensor input. The THZ3 and TDZ3 2-wire (loop powered) transmitters provide an isolated and linear 4 to 20 mA output proportional to input. They accept a direct signal input from a wide array of sensors and analog devices, including 14 RTD types and nine thermocouple types, resistance and potentiometer devices, and direct millivolt sources. They are also HART 7 compliant with exception-based reporting and dynamic variable mapping.
The dual sensor input allows the THZ3 and TDZ3 to offer backup and fail-over protection, with either of the sensors or inputs designated as the primary measurement and the secondary input acting as a backup sensor in case of a primary sensor failure. Additionally, by utilizing this dual input capability, 15 THZ3 or TDZ3 transmitters can be multi-dropped on one digital HART loop to monitor 30 temperature points, which is intended to reduce wiring costs.
The device intelligence feature is a series of features for smarter control and monitoring includes sensor drift and corrosion detection that checks and alerts users when the sensor is drifting out of a preset range or when the resistance due to corrosion exceeds set parameters. It also comes with smart range alarms with four HART alarms that are set to any input or calculated input. It also has input simulation capability, which allows manual input of a direct or calculated value. This simulates a real input, which allows users to test the AO or any HART diagnostic and range alarms.
The sensors have an input-to-output analog accuracy of up to ±0.014 C utilizing sensor matching and trimming over a 100 F span. The transmitters feature 20-bit input resolution and deliver exceptional input accuracy for all sensor types. They also feature continuous sensor diagnostics feature to reduce troubleshooting. Advanced RFI/EMI protection and ambient temperature compensation guard against environmental factors that can quickly degrade measurement accuracy.
They are also HART and DTM programmable with user-oriented basic configuration for a quick setup. Utilizing the HART DD they can be configured and interrogated on the 4-20 mA loop via any HART handheld communicator or HART compatible host. Users can also program or monitor the transmitters with any FDT compliant host or program.
– Edited by CFE Media. See more Control Engineering process sensor and actuator products.