Universal Input Reduces Inventory Levels

Eliminates Ground Loops

Custom Linearization for Special T/C Types

Supports Single or Dual Inputs

User-Friendly Configuration

The T287 is a programmable two-wire transmitter that is configured to provide an isolated 4-20mA signal in proportion to the input signal. The T287 accepts thermocouple, 2-wire, 3-wire, or 4-wire RTD, potentiometer, resistance and millivolt inputs. The T287 supports either single or dual inputs. In the dual input mode, either input can be selected to control the output, or math functions can be applied in which both inputs have an effect on the output. The functions available are Sum, Difference, Average, Higher of the two or Lower of the two inputs. Typical applications include providing accurate, stable signals to distributed control systems (DCS), supervisory control and data acquisition systems (SCADA), environmental monitoring and control systems (EMCS), data acquisition and control systems (DACS) and custody transfer/pipeline systems.

Configuration is performed by connecting the transmitter to a standard (9-pin RS-232) PC serial port using an isolated interface adapter, and running a user-friendly Windows-based program. All of the configuration information can be defined and modified using only a PC, the interface adapter, and the transmitter. No loop supply, input simulation or meter on the output is required. The fully isolated adapter reduces the risk of damage to the PC which can be caused by spikes and surges on field wiring entering the computer via its unprotected serial port.

The T287 yields higher accuracy and long-term stability with lower power consumption than prior generation transmitters. The T287 automatically performs self-tests and auto-calibration while in service, resulting in a stability of better than ±0.1% of span over 12 months.

Operation
Every T287 is factory calibrated and can be configured to perform the desired function using the Device Configuration screen and the Sensor Selection Screen. Just fasten the DB-9 connector to the computer’s serial port and the keyed 6-pin connector to the port under the access cover on the top of the transmitter. There is no need to provide an external power supply and load to the T287’s output to configure the transmitter.

Units already in service can have their configuration “up-loaded” to the PC. Their operating parameters can be reviewed, and if necessary, revised and downloaded again. All configuration parameters can be stored in a configuration file on the PC for future use. The Configuration & Calibration Software, Isolated RS-232/T287 Communications Adapter and User’s Guide are included in the model C680-0001.