Cảm biến đo nhiệt độ STT25D Honeywell

STT 3000 – Series STT250 Smart Temperature Transmitter

The STT250 Series Smart Temperature Transmitter is a microprocessor based unit suitable for accepting a wide variety of thermocouple and resistance temperature detector sensor inputs or direct ohm or milli-volt inputs and providing a 2 wire 4-20 mA “Analog”, digital “DE”, or analog “HART” proportional output.

The transmitter offers high accuracy and stability together with wide flexibility to suit a wide range of applications. All adjustments and operational settings are implemented through the Smart Field Communicator (DE) or the HART communicator (HART). Both field communicators access the transmitter by connecting across the 4-20 mA wiring in parallel with the STT250 anywhere along the wiring up to 1500 meters from the transmitter for both the DE and HART protocol versions.

Note: 1500 m is the maximum HART cable length but may be restricted by cable capacitance limits.

•   Model STT25M provides a 4-20mA analog output and is configurable with the Honeywell Smart Field Communicator (SFC) or the PC based Smartline Configuration Toolkit (SCT). The terminal assembly is black for visible differentiation.

•   Model STT25D provides both the 4-20mA analog output as in Model STT25M or the digital DE protocol for digital integration to the Honeywell control system or other compatible interfaces. The terminal assembly is black for visible differentiation.

•   Model STT25H provides the output per the HART communication protocol. STT25H supports both version HART5 and HART6 protocol. The terminal assembly is blue for visible differentiation.

•   Model STT25S provides the output per the HART communication protocol and TUV SIL 2 safety rating. The terminal assembly is blue for visible differentiation (with SIL certification). Only HART6 protocol for STT25S.

•   Model STT25T can be configured to have average/ difference of 2 inputs. The STT25T can be used for redundant switchover (except for RTD/RTD) and used with split range (switches over from one sensor to the other at a user-defined value, so as to use accuracy region of both sensors). The STT25T can also be used as an indication of sensor degradation. STT25T can be used as a single input transmitter for all sensor types (thermocouple, mv, rtd,ohms). STT25T supports both version HART5 and HART6 protocol. It is configurable with the HART hand held communicator or a PC based HART maintenance system (such as Honeywell’s FDM and Experion system). STT25T HART6 version carries SIL certification.