Instruction manual

3938
Special Functions
Note: In degrees Celsius mode there will be a shift, as follows:
(The lowest value of the range is the zero output for the output function)
“J” couple = -18 to 760 degrees C
Output -18 degrees C = 0 Vdc/0 mAdc-unsuppressed
= 1 Vdc/4 mAdc-suppressed
760 degrees C = 5 Vdc/20 mAdc
Figure 15. Wiring Diagram for Process Variable Retransmis-
sion
SPECIFICATIONS
I out (current output) = 0-20 mA / 4-20 mA
Voltage Headroom = 8 Vdc- standard
= 18 Vdc - for multiple chart recorders optional
V out (voltage output) = 0-5 Vdc / 1-5 Vdc
I out MAX = 20 mA
Output Impedance = 255 ohms max.
Note: Voltage out requires a jumper
between terminals 16 & 17
Process Variable Retransmit
Retransmit Signal is the retransmission of the process
variable (PV) signal out to an external device:
*Chart Recorder *Indicator
*Process Controller *Data Logger
Generally, the main purpose of the retransmit signal is for
keeping a log of data information with respect to time. It is
not a scaleable parameter, but rather a variable process sig-
nal, dependent on sensor type.
This option provides the user with the capability to attach
auxiliary equipment, such as chart recorders, computers, etc.
The outputs are:
suppressed— 1-5 Vdc/4-20 mAdc
unsuppressed — 0-5 Vdc/0-20 mAdc
They correspond to the zero and full scale values of the range
selected.
Example: “J” couple = 0 to 1400 degrees F
Output = 0-5 Vdc/0-20 mAdc unsuppressed
= 1-5Vdc/4-20 mAdc suppressed
0 degrees F = 0 Vdc/0 mAdc-unsuppressed
= 1 Vdc/4 mAdc-suppressed
1400 degrees F = 5 Vdc/20 mAdc
Special Functions
These output values
are linear with and
dependent upon the
sensor being used,
i.e., the lowest value
of the sensor’s out-
put range corre-
sponds to zero or
low for the output
function.