How to Calibrate a Spirit Level
A spirit level is a tool that helps you gauge whether an object is level. The glass tube in the level is comprised of a liquid or a spirit like ethanol, which in turn indicates the exact reading. If the spirit creates an imbalance, the level will give out an inaccurate reading. The process of rectifying this error is known as calibrating. Read on to find out how to calibrate a spirit level.
Step 1 - Prep Work
Before you start calibrating the spirit level, make sure you have all the materials handy. First and foremost, you need a sturdy table. You will be using this table as the base to judge the level.
Step 2 - Place
Begin with the process by placing the spirit level on the table. Make sure you place it gently without using swift movements.
Step 3 - Wait
After you place the spirit level on the table, wait for 20 to 25 seconds. This will allow the level of the liquid to stabilize in case a swift motion was applied or too much vibration was generated while moving it. This will also produce a true reading.
Step 4 - Note
The next step is to observe the reading. Note the point where the bubble rests on the spirit level's scale. This scale is printed on the outside of the glass vial.
Step 5 - Turn
The next step is to turn the level. This will result in the top edge now going to the bottom as you have revered the spirit level. Wait for 20 to 25 seconds to help in settling the vibrations created while the shift was taking place.
Step 6 - Observe
Look at where the bubble is resting and note its position. Now compare it to the position what you had noted in Step 4. If both are the same, then the level has been calibrated.
In case the readings differ, look at which end the bubble is proximal to. Flip the level over, and again check which side the bubble is resting. If the bubble in both positions rests on the same side, then it is an indication that the surface of the table is not in a level position.
Step 7 - Fix
Take any material with a flat surface and can be used as a wedge. Place it under the leg of the table. Adjust till the bubble reached the center of the scale.
Step 8 - Flip
To check the legitimacy of the level, flip it around one last time. If the bubble shifts in the direction opposite to the reading, you need to readjust the level.
Step 9 - Locate the Screw
Find the screw on the edge of the glass tube.
Step 10 - Calibrate
Place the spirit level on the table. The screw edge should face upward. Turn this screw with a screwdriver. This will adjust the level of the spring. Turn the level's screw until the bubble is centered.