# GIS gas-density trend interface

Canonical URL: https://eloragrid.ai/symbols/gis-gas-density-trend-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: GGTI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchyards
Input: Density measurements and time
Output: Gas-condition trend

Connects the selected continuous gas-density measurements to station condition recording.

## In plain English

### What this block does

Connects the selected continuous gas-density measurements to station condition recording.

### A simple example

In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Density measurements and time” at the input and “Gas-condition trend” at the output. Trend interpretation depends on the measurement method.

### What the drawings help you do

Start at the named input: Density measurements and time. Identify its source device or document and the state represented on the drawing. Follow the named output: Gas-condition trend. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Density measurements and time
- Output: Gas-condition trend
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Density measurements and time → GGTI → Gas-condition trend
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm)


## What it represents

Connects the selected continuous gas-density measurements to station condition recording. Yard equipment supervision carries the condition and support-system information of primary equipment into station alarms. A monitor's declared alarm, measurement and self-fault output need separate point names.
In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Density measurements and time” at the input and “Gas-condition trend” at the output. Trend interpretation depends on the measurement method.
Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

## How to read it

- Start at the named input: Density measurements and time. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Gas-condition trend. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Trend interpretation depends on the measurement method.
- Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life.

## Information to show or reference

- Label the source and connection reference for density measurements and time.
- Identify the destination and defined state of gas-condition trend.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Trend interpretation depends on the measurement method.

## Important distinction

Trend interpretation depends on the measurement method. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

## Facts

- Representation: Functional block
- Installation focus: Switchyards
- Input / boundary: Density measurements and time
- Output / connection: Gas-condition trend
- Lookup label: GGTI is a library lookup label, not a standard device designation.

## Public references

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm) — Hitachi Energy. Public technical context for switchyard equipment condition interfaces. Gas, operating mechanism and circuit-breaker condition monitoring. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## 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.