How to Detect a Liquid Level Through a Plastic Container
- 1). Hold the container up to a light source to determine if it is translucent or opaque. If the liquid can be seen moving inside the container, the liquid can be measured from outside the container. However, if the container is opaque and the liquid cannot be seen from the outside, the container will need to be opened to measure the liquid level.
- 2). Place the ruler directly against the outside of the container if dealing with a translucent container. Place the bottom of the ruler squarely on the table or floor supporting the container.
- 3). Measure the level of the liquid by matching the numbers on the ruler with the top level of the liquid. Make sure the liquid is not disturbed or moving around while trying to measure. Keep it as still as possible to ensure an accurate measurement.
- 4). Place the ruler inside the container if it is opaque. Insert the ruler straight down into the container until it touches the bottom of the container.
- 5). Remove the ruler from the opaque container, and determine the point at which the moisture on the ruler starts. Match that level with the numbers on the side of the ruler to determine the level of the liquid within the container.
- 1). Place the liquid level sensor against the plastic container. These specialty devices can be used in cases where the container is opaque and cannot be opened, or in cases where the liquid might be hazardous if exposed to the open air.
- 2). Move the sensor below the top of the liquid level. Watch the sensor for an indication that it is detecting the liquid on the other side of the container. This is usually indicated by either a flashing light or an audible beep.
- 3). Move the sensor slowly up the side of the container. Monitor the indication of liquid detection. Once the detection signal turns off, that is an indication that the sensor is now above the liquid level in the container. Move it back down the container until it turns back on to determine where the top of the liquid is.
