---
title: "Open"
canonical: "https://help.innovyze.com/space/info360/15008030/Open"
format: markdown
---
Outputs the first value within a given sampling interval.

For example, if a sensor gives raw data every 5 minutes, but an hourly sampling interval is applied to a chart, Open() will give the first raw data point reported over the previous hour.

Specifically, the Open() reported value at 2:00, is the raw data point at 1:05 if a five minute interval is used.

| **<span style="color: #003366">Parameter</span>** | **<span style="color: #003366">Description</span>** |
| --- | --- |
| **Sensor ID** | The unique ID of the sensor data to be used in the function.<br>> ❌ **Warning:**
> ❌ 
> ❌ This function must be run directly on raw sensor data. An internal function cannot be used (e.g. High(Previous(4))), as this does not pass all the required information. |

### Example Usage as an Expression:

Open('PRV1-2B.PRV Flow Rate'): Find open values from sensor PRV1-2B. PRV Flow Rate

### Examples Reference Chart:

The following example shows various reports of daily tank levels overlaid on an [Candlestick Chart](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15007771). The [Open](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15008030) and [Close](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15007977) value indicate whether the tank experienced a net filling or draining through the day, while [High](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15008009) and [Low](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15007996) show the range of values that day. The [Average](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15007973) value shows the central tendency.

![image](media://928adb07-1a6a-4e03-90e5-917de75ea899)


For information on setting up custom equations and syntax, please refer to [Analytical Functions](https://help-innovyze.atlassian.net/wiki/spaces/info360/pages/15007825).