This is the most common configuration of modern 4-20mA transmitters. Current source transmitter, non isolated (3 wire) Therefore it is important to qualify whether it is the transmitter or the control system that is to be wired in a specific configuration.įor the purposes for this guidance note it is assumed that both the transmitter and the remote control panel require a 24Vdc supply. When transmitters are wired in a current source configuration it follows that the control system will be current sink, and vice versa.
#SIGNAL ISOLATOR WIRING DIAGRAM MANUAL#
Check the transmitters technical manual for the available options. However some transmitters may be limited to either a sink or source configuration. Most modern transmitters can be wired in a current sink or source format, selection is often made by the use of specific terminals or the location of a link within the transmitter. The design of the associated control panel dictates which option should be used. Several transmitter wiring options exist. This supply can be derived local to the transmitter or supplied direct from the associated control panel. Transmitters typically require a 24Vdc supply. audible and visual alarms or initiate some trips or even plant shut down procedures. The control panel uses this signal and activates executive actions via relay contacts.Į.g.
This signal is sent to a remotely located control panel. Gas detectors / transmitters offer 4-20mA outputs, where 4 mA equates to a zero reading and 20 mA equates a full scale reading of the calibrated range. Industrial transmitters are available for monitoring many parameters these including pressure, temperature and flow etc. Current sink transmitter, non isolated (3 wire).Current source transmitter, non isolated (3 wire).
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