Eurotherm T287 Data Sheet

TRANSPAK

™

T287

Programmable Isolating

Universal Input 2-Wire Transmitter

Provides an Isolated, Linearized Current Loop in

Proportion to a Thermocouple, RTD, Millivolt,

Potentiometer or Resistance Input

 Universal Input Reduces Inventory Levels
 Eliminates Ground Loops
 Supports Single or Dual Inputs

Description

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 4­wire 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.

 User-Friendly Configuration
 Custom Linearization for Special T/C Types
 DIN Rail Mounting Adapter Included

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. A zero and span trimmer (model C680-

0002) is also available which allows users to adjust the zero and
span without connecting a PC. Just plug the trimmer into the
programming port and press the up or down button.

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.

Specifications

Input Types:

Thermocouples:

Most standard types & all special types
using customer defined tables &
polynomials.

RTD:

2-, 3- & 4-wire, Pt-100, Ni-110, Ni-120
& other RTDs. Includes Callandar-Van­Dusen adaptation and custom sensors
linearization with user defined tables

and polynomials.
DC mV: -10 to 100mV
Potentiometers: 0 to 20k Ohms
Resistance: 0 to 400 Ohms

General Specifications:

Minimum Range: 2mV
Output: 4-20mA
Supply Voltage: 9-40VDC @ no load,

reverse polarity protected
Maximum Load:

R

= (V

max

– 9V) / 20mA

supply

Operating Temperature:

-40 to 85°C

Storage Temperature:

-55 to +125°C

Humidity:

0 to 95% RHNC
Response Time:

0.3 seconds, to 90% of input (>3 updates/sec)

Damping Factors:

Programmable 0 to 64 seconds, to 0 to
120% of input range, using config software

Stability:

Better than ±0.1% of span for 12 months

Isolation:

2000VDC, input to output

RFI Protection:

<1% effect of span at 20-1000MHz and
at field strength of 20V/m

Performance Specifications:

Output Resolution:

0.015% of span (2.5uA)

Output Linearity (D/A):

Better then 0.02% of output span

Terminal Assignments

Sensor Linearization:

Better than 0.1°C for RTDs
Better than 0.2°C for Thermocouple
Cold Junction Compensation:
Automatic to within ±0.7°C for all

thermocouples

Temperature Stability:

0.015%/°C combined zero and span.

Supply Voltage Effect:

< ±0.003% per volt.

Calibration:

Automatic, unit includes all calibration
parameters. The unit performs periodic
zero and span self-test, and auto
calibration.

Input Linearity:

Better than 0.01% of span (mV input)

Ordering Information

Models & Accessories
Specify:

1. Model: T287-0000

2. Model: C680-0001 Isolated Communications Adapter, Configuration

and Calibration Software, and User’s Guide.

3. Model: C680-0002 Zero/Span Trimmer.

Accessories

AP9046 Action Pak 24/40VDC, 65mA Loop Power Supply

V560/565 3-1/2 digit remote loop powered indicator with wide

ranging display.

T25H-0000 Head Mount Enclosure - 1/2 NPT for Thermowell and Conduit.

Dimensions

Note that detailed installation instructions are
available on our website.

Head Mount Enclosure

Action Instruments Chessell Eurotherm