# Density switch or sensor

Canonical URL: https://eloragrid.ai/protection-functions/61-density-switch-or-sensor
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 61
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI

Monitors the density of a medium used by electrical equipment.

## What it represents

Monitors the density of a medium used by electrical equipment.
In a drafting package, connect this reference to the density sensor and monitored compartment. The associated drawing should trace the density alarm, lockout or operating permission; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.

## How to read it

- Identify the density sensor and monitored compartment.
- Trace the density alarm, lockout or operating permission.

## Information to show or reference

- Label the density sensor and monitored compartment.
- Cross-reference the density alarm, lockout or operating permission.
- Identify the device tag, manual revision and logic drawing that define this implementation.

## Important distinction

Density is distinct from pressure; temperature-compensated gas-density supervision should not be relabelled as 63 solely because a gauge is present.

## Facts

- ANSI / IEEE function number: 61
- Drawing context: The density sensor and monitored compartment
- Application scope: Protection or apparatus-control role; exact implementation is defined by the equipment documentation.

## Public references

- [SecoGear medium-voltage switchgear application and technical guide, DET-882](https://library.e.abb.com/public/a06cf4cf38b34800b27bb337ab12f74f/DET-882%20SecoGear%205kV-15kV%20IEEE%20Metal%20Clad%20Switchgear_Application%20and%20installation%20guide.pdf) — ABB. Public manufacturer number/name association. Drafting explanations are independently written.
- [IEEE C37.2-2022: power-system device function numbers](https://ieeexplore.ieee.org/document/9984140) — IEEE. Normative device-number publication; exact edition wording and compliance require the licensed standard.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.