Emerson Process Management Bristol Series 9110 - Manual (Page 38)

Field Wiring 4-6 CI-9110
CAUTION
When using the Regulator with a device that provides latching type
outputs (output stays ON until turned OFF), the Raise/Lower inputs
must be set for a pulse incremental signal. (see Section 3 - Board
Setup). This will prevent the Regulator from driving full scale should
the telemetry line open while in the middle of a Raise or Lower
command. By using this configuration, the pressure output value will
only change when input pulses are received.
Figure 4-6 - Current Output to FSK Bi-State Transmitter
4 .6 4-20 mA CURENT OUTPUT
The current output of the Regulator can be used to drive a METATONE B, FSK Analog
Transmitter as shown in Figure 4-6. The 4-20 mA current signal is referenced to signal
common and flows through the loop resistor present at the input of the Analog Transmitter.
The current signal modulates a tone carrier which communicates with an Analog Tone
Receiver at the command site (not shown).
4.7 DC POWER
The Remote set Regulator is factory-shipped for 12 or 24 Vdc supply operation. Before
power is applied, a check should be made to ensure that the Regulator type matches the
supply source.
The dc supply source is wired to the Regulator in Figure 4-7. An earth ground must be
provided for both the Regulator housing and the supply. The connection for the Regulator is
made to the green grounding screw located inside the housing (see Section 2 - Installation
for illustration).
WARNING
Metal enclosures and exposed metal parts of all electrical
instruments and devices must be grounded to prevent accidental
electrical shock. Grounding must be in accordance with latest
OSHA rules and regulations pertaining to "Design Safety
Standards For Electrical Systems."