Instrument cable
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On a PID diagram, the representation of LI is a circle with a horizontal line inside it, as shown below; this indicates instruments installed on a centralized dashboard. If this level indicator is a secondary instrument used on-site, is it necessary to provide the control room with power cables for the secondary instrument, as well as signal cables that connect the on-site level transmitter to the secondary instrument? If the level gauge is an integrated digital display panel that comes as part of the level transmitter kit, or a separate panel, is a power cable and a signal cable still required? If necessary, is the cable configured below suitable?
If the level indicator is a secondary instrument used on-site, it usually requires a power cable to be supplied from the control room for power, as well as a signal cable running from the level transmitter to the secondary instrument. For level gauges with integrated digital displays or separate displays, power cables and signal cables are also usually required. The power cable is used to supply the required electricity to the instrument, while the signal cable is responsible for transmitting signals between the transmitter and the display unit. As for whether the specific type and specifications of the cable are appropriate, it is necessary to select cables with suitable specifications based on the actual electrical requirements and environmental conditions, taking into account factors such as the cable’s conductive material, insulation material, and diameter. It is recommended to consult an electrical engineer or refer to relevant electrical design standards to determine the most suitable cable type. .
From the control room to the field instruments, instrument cables should be used as required (depending on the number of conductors needed); the cables connecting the separate instruments are provided by the manufacturer as part of the kit