Behind-panel mounted instrument
An instrument symbol with a dashed horizontal line bisecting the circle, denoting an instrument mounted behind the panel. Inside the cabinet, not directly accessible to the operator.
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How it’s drawn.
An instrument circle with a dashed horizontal line across the middle. The dashed line says the device lives inside the cabinet or behind the board, not on the operator-facing panel. It is common for computing relays and signal conditioners that do their work out of sight. A solid line in the same position would make it primary, operator-accessible instead.
Typical usage.
Computing relays, signal conditioners, and other auxiliary devices that live in the marshalling or controls cabinet but do not surface on the operator-facing panel. Tags carrying second-letter Y, computing relay frequently use this mounting convention.
Telling it apart.
- Dashed line means behind the panel. Solid line means primary panel. The line style is the only difference in the symbol.
- Behind-panel does not mean unimportant. Trip relays and computing blocks often sit here while doing safety-relevant work.
- No line at all would make it a field instrument. The dashed line is what keeps it in the cabinet.