Smart Temperature Transmitter STT350

STT350 is Honeywell’s high-performance smart temperature transmitter. The output is transmitted in either an analogue 4-20mA format or Honeywell’s DE protocol format for digital integration with the Honeywell TPS control system.

Select the analogue or digital output format through the Smart Field Communicator (SFC), the common handheld operator interface for our Smartline™ transmitters, or with the PC-based SCT 3000 (Smart Configuration Toolkit). All configuration, operation and communication functions are implemented remotely from the TPS consoles or through the SFC or SCT.

 STT350 transmitters are suitable for new installations as well as replacements for any conventional or smart temperature transmitters in use today. The transmitter’s memory contains the characteristics of the RTD and thermocouple temperature sensors most commonly used. You can easily use the handheld or PC tool to configure the transmitter for any of these sensors. Accuracies stated in the performance specifications below are available by selecting the sensor type and range (i.e. without user calibration). Calibration of the LRV/URV end points will typically improve accuracy up to two times.

Sensor errors can be minimized by calibration to the specific sensor either by setting it at the LRV/URV temperatures or by simulation of the known values. Additionally, all units pass through environmental stress screening by fast cycling between -40 degrees Celsius and 85 degrees Celsius to ensure maximum product reliability. During this process the ambient temperature coefficients are determined for each unit and burned into memory to ensure temperature compensation over a wide range of operating conditions. Configuration adjustments and diagnostics checks can be made either locally or remotely from anywhere along the signal wires. This saves time during commissioning, start up and maintenance activities.

Features

• Four common models of temperature transmitters are available for application.
  • STT350 4-20mA Output, DE protocol
  • STT35F Fieldbus Temperature Transmitter Module
• Unmatched performance – 0.13C total performance accuracy for 100 Ohm platinum RTDs
• Superior stability – 0.05 percent maximum span per year
• Provides true differential temperature measurement of thermocouple or RTD inputs by individual linearization of each sensor reading and then computing the difference
•  Supports dual thermocouple sensor inputs for redundant sensor operation
• Suitable for 2, 3 or 4 wire 100 and 200 Ohm platinum RTD measurement
• Standard digital cold-junction compensation function provides accurate and reliable temperature measurement over a wide ambient operating range
• Includes sensor break detection on all input wires