SOP: Cleaning a Laboratory Balance

Scope

This SOP describes the procedure for cleaning a laboratory (bench top) balance (both analytical balance and precision balance). It is designed to instruct laboratory personnel on how to proceed for thorough cleaning of a balance. The cleanliness of a laboratory balance can have a significant impact on operational efficiency and balance lifetime, as well as user safety.

Cleaning Rules – Do’s and Don’ts

• Make sure personnel are instructed on how to clean balances. Incorrect handling may cause damage to the weighing system or the electronics.
• First remove powder and dust, then sticky substances.
• For powder and dust use a tissue. Never blow; this could transport dirt or spilled sample materials inside the balance.
• For removal of sticky substances, use a damp lint-free cloth and mild solvent (Isopropanol or Ethanol 70%); avoid abrasive materials.
• Do not spray or pore liquids directly on the balance.
• Wipe away from cone opening (where the pan sits) or air ducts (gaps in front or at rear of the draft shield), when using cloth or brush.
• Remove parts for cleaning where possible (e.g. weighing pan, drip, tray). Only remove parts that can be removed without tools and whose removal is described in the operating instructions.
• If possible, do not disconnect peripheral devices unless cleaning is not possible without doing so.
• Clean the balance in its working location; do not tilt, move or carry it around if you are not instructed on how to carry a balance. Incorrect handling may cause expensive damage.