Analytical Balance Preventive Maintenance Checklist (Free Log Template)

By MNM Scales · Last updated October 31, 2026

Reviewed by MNM Scales technicians · Updated October 31, 2026 · Prices checked October 31, 2026

An analytical balance reads to 0.1 mg, so dust in the chamber, a draft from a vent or a balance knocked off level can shift a result. A short routine run by the people who use the balance catches most of those problems early. MNM Scales has sold, calibrated and repaired balances for over 30 years from our shop in Cypress, Texas. This checklist covers the user-side routine; your lab SOP and the balance manual set the exact tolerances and cleaning agents. For how often a balance should be professionally calibrated, see how often should a scale be calibrated.

Analytical balance preventive maintenance checklist at a glance

How often	Task	What to record
Daily (before first use)	Check the level bubble, clean the pan and floor of the chamber, confirm warm-up, run internal calibration or weigh a check weight	Date, check weight ID, reading, pass or fail, initials
Daily (after use)	Brush out spills, wipe the pan, close the doors	Any spill or incident
Weekly	Clean the draft shield doors and chamber walls; repeatability check (same weight 5 to 10 times)	Standard deviation of the repeat readings
Monthly	Corner-load (eccentricity) check and a linearity check at several loads; review the environment and the log	Readings at each position and load, pass or fail
Annually (or as your SOP sets)	Professional calibration with a certificate, plus service if checks are trending out	Certificate number, date, next due date

Daily checks before the first weighing

1. Level: look at the level bubble. If it is off center, turn the leveling feet until it is centered, then recheck. Many analytical balances, such as the A&D HR series and BM series, have an illuminated level bubble on the front.
2. Warm-up: leave the balance plugged in and warmed up for the time its manual gives before you rely on it. A cold balance drifts.
3. Clean the pan: brush off any powder with a soft brush and wipe the pan with a lint-free cloth.
4. Calibrate or check: run internal calibration if the balance has it, then weigh a check weight. Balances with external calibration need a calibration weight (not included with the balance). See internal vs external calibration.
5. Zero: close the doors, tare and confirm the display holds zero.
6. Record it: write the check weight reading in the log and initial it.

Weekly: cleaning the pan, draft shield and chamber

• Power down first if the manual says to, and remove the pan and any parts the manual allows to come out. On the A&D HR-AZ and HR-A models, the breeze break is removable for cleaning.
• Brush, do not blow. Compressed air pushes powder into the weighing cell. Use a soft brush and a small vacuum or a damp lint-free cloth.
• Use a mild cleaner that the manual approves, on the cloth rather than sprayed into the balance. Wipe the glass doors inside and out so you can see the pan.
• Let everything dry and reinstall the pan exactly as it came out. A pan that rubs or sits crooked causes drifting readings.
• Run a repeatability check: weigh the same weight 5 to 10 times, removing it between readings, and record the spread. A spread that grows from week to week is an early warning.

Monthly: corner load, linearity and environment

• Corner load (eccentricity): place a test weight at the center and then at the front, back, left and right of the pan. The readings should agree within your SOP tolerance.
• Linearity: weigh test weights at several points across the range, such as a quarter, half and full capacity, and compare them to the certified values.
• Weights: use certified weights of a class suited to a 0.1 mg balance, handled with tweezers or gloves. See calibration weight classes and calibration weights (not included with balances).
• Review the log: look for trends in the daily check weight and the weekly repeatability, not only single failures.

Check the room as part of the routine

• Drafts: keep the balance away from HVAC vents, doors and busy walkways, and keep the doors closed while weighing.
• Vibration: use a solid bench or a weighing table, away from centrifuges, pumps and foot traffic.
• Temperature: avoid direct sun and spots near heaters or windows, and let samples reach room temperature before weighing.
• Static: dry air and plastic vessels can make readings wander. An ionizer helps; the A&D BM-200 has one built in.

Annual: professional calibration and service

Daily checks tell you whether the balance still reads correctly; they do not replace a calibration with a certificate. Once a year, or on the schedule your SOP or auditor sets, have it calibrated by a lab that documents the results. Our balance calibration service in Houston handles this step, including service and repair when checks start trending out.

• Balances up to 2.2 kg (nearly all analytical balances): in-house calibration with a certificate $95 or NIST calibration with a NIST-traceable certificate $395. See NIST vs in-house certificates.
• On-site service: $295 + $2 per mile per visit across the Houston area, with calibration charged per balance. On-site calibration details.
• Mail-in calibration: ship the balance to our shop. How mail-in calibration works.
• Rentals: MNM rents all types of scales if you need one while yours is in for service.

Balance maintenance log template

Copy this table into a spreadsheet or print it and keep it next to the balance. One row per check keeps the history easy to audit.

Date	Check	Weight ID and value	Reading(s)	Pass or fail	Initials	Notes or action
	Daily check weight
	Weekly repeatability
	Monthly corner load
	Monthly linearity
	Cleaning

Warning signs that call for service

• The reading will not settle or keeps drifting after you have leveled, cleaned and closed the doors.
• The check weight or repeatability check fails twice in a row after cleaning.
• Internal calibration fails or shows an error.
• An error code you cannot clear; see scale error codes explained and why a scale will not zero.
• Liquid or powder got under the pan, or the balance was dropped or moved without care.
• The pan rubs, keys do not respond or the display is damaged.

If you see any of these, stop using the balance for results and contact us or call (832) 290-3120. Our TDA-registered technicians repair the brands we sell and return the balance calibrated.

Compare analytical balances in stock

If a balance is past repair or you are adding a second one, these in-stock models all read to 0.1 mg. The upkeep column lists the features that make the routine above easier.

Balance	Capacity x readability	Calibration	Upkeep features	Price
A&D HR-100A	102 g x 0.1 mg	External (weight not included)	Illuminated level bubble; removable breeze break for cleaning	$939
A&D HR-250AZ	252 g x 0.1 mg	Internal, one-touch	Illuminated level bubble; removable breeze break for cleaning	$1,349
Sartorius BCE124I-1S Entris II	120 g x 0.1 mg	Internal, isoCAL automatic	Calibrates itself when the temperature changes; glass draft shield	$1,679
Sartorius BCE224I-1S Entris II	220 g x 0.1 mg	Internal, isoCAL automatic	Calibrates itself when the temperature changes; glass draft shield	$1,879
Sartorius BCE224-1NUS Entris II	220 g x 0.1 mg	External	NTEP Class I (CC 22-017) for weighing in trade	$1,998
A&D GX-224A	220 g x 0.1 mg	Internal plus automatic self calibration	ECL repeatability self-check in about 90 seconds; impact shock detection	$2,199
A&D BM-200	220 g x 0.1 mg	Internal plus automatic self calibration	Built-in ionizer; temperature, humidity and pressure sensors	$3,376

Selling by weight in Texas: if the balance prices product by weight, check the trade rules before you choose. TDA does not require an NTEP certificate for every device, but the scale must meet NIST Handbook 44 and suit its use; some scales do need one, so we recommend NTEP models and can check yours. TDA explains this in Legal for Trade Scales in the State of Texas (PDF). The Sartorius BCE224-1NUS above is NTEP Class I; see what NTEP legal-for-trade means.

See every model in analytical balances, or compare types in analytical vs precision balance. Entris II owners can find the isoCAL settings in our Sartorius Entris II manual guide.

Frequently asked questions

What should an analytical balance preventive maintenance checklist include?

Daily leveling, pan cleaning, warm-up and a calibration or check-weight test; weekly chamber cleaning and a repeatability check; monthly corner-load and linearity checks with test weights; and annual professional calibration with a certificate, all recorded in a log.

How often should an analytical balance be cleaned?

Brush the pan and chamber after each use or spill, and do a full clean of the pan, draft shield and chamber each week, using only cleaners the manual approves.

Does a balance with internal calibration still need annual calibration?

Yes. Internal calibration adjusts the balance with its built-in weight, but a calibration with a certificate checks it against outside test weights and documents the result for audits.

What weights do I need for daily balance checks?

A certified check weight near the amount you usually weigh, of a class suited to a 0.1 mg balance. Monthly linearity checks use several weights across the range. Weights are sold separately and not included with balances.

What are the signs an analytical balance needs repair?

Readings that will not settle after leveling and cleaning, repeated failed check-weight or repeatability checks, internal calibration errors, error codes you cannot clear, and spills under the pan.

How much does analytical balance calibration cost?

Balances up to 2.2 kg are $95 for in-house calibration with a certificate or $395 for NIST calibration with a NIST-traceable certificate. On-site service adds $295 + $2 per mile per visit.