Product data

Product Data Document
1660ds9b / D301294X012
October 2011 - Page 11
ControlWave GFC Plus
Remote Automation Solutions
www.EmersonProcess.com/Remote
RTD Interface Information
A three-wire platinum RTD per DIN 43760 is sup-
ported. The temperature, T, in degrees Celsius is
calculated using the Resistance vs. Temperature
Tables according to the DIN EN 60751 standard
for Class A & B RTDs. ControlWave GFC Plus
supports the full range in the DIN standard, -40 to
660ºC.
The DIN EN 60751 equation is:
R(t) = R0 * (1 + At +Bt2)
Where:
A = 3.9083 * 10-3 oC-1
B = -5.775 * 10-7 oC-2
Ro = 100ohms
In addition, the user may enter the Ro, A, and B
coefcients of a custom calibrated RTD, another
platinum standard or a different material (Nickel,
Balco or Copper).
During the RTD calibration, the user will be able to
set the coefcients, restore the factory default for
these coefcients, and calibrate the internal Refer-
ence resistor.
RTDInputSpecications
These specications are for the interface, only, not
including the RTD probe or wiring (please note that
RTD probe interchangeability can add ±0.7°C of
uncertainty to the measurement).
RTD Conversion Accuracy: ± 0.1°C, or ± 0.1% •
of reading, whichever is greater
Ambient temperature effect on RTD •
measurement: ±0.01°C / ºC max
Long Term Stability at Constant Conditions: •
±0.25ºC / month max
THERMOWELL OPTIONS FOR RTD
For new installations, or those lacking a thermowell,
you can choose one of three lengths of thermowell
for the RTD.
21V DC/DC POWER SUPPLY
Since the I/O card does not include loop power, this
option provides power if 4 – 20 mA loops are to be
used or if transmitters that require a voltage higher
than the nominal, 12 Vdc supply voltage are to be
powered. This option converts the nominal, 12 Vdc
input to 21.4 Vdc for eld devices such as transmit-
ters.
Please note that, since the minimum input voltage
for this option is 10.8 Vdc, it will not work with nomi-
nal 6 Vdc or 9 Vdc power sources. While the 21V
dc/dc Power Supply is required for use with a Bristol
3508 transmitter, it is not necessary to provide
power to 2808 or 3808 MVT models.
For those, we recommend that system power be
routed to the transmitter. The Power Distribution
Board is a good way to provide power routing to
either of those transmitters. Furthermore, the 2808
and 3808 MVT will operate using nominal 6 Vdc and
9 Vdc power sources.
The 21V dc/dc Power Supply is not necessary if
loop power is otherwise available or if there are no
analog I/O points.
This option is a circuit board that is located on a
Snap Track, which is installed onto the back panel
in the lower, right-hand section of the enclosure.
Note that the Power Distribution Board is also
required if the 21V dc/dc Power Supply is selected.
This is another Snap Track option that is located
nearby the 21V dc/dc Power Supply.