How to calibrate Adam scales and balances, what weights and conditions you need, how to check the result, and when Australian sites need a NATA-endorsed report.
Calibrating an Adam scale or balance comes down to two layers. The first is the adjustment you run from the keypad with a known mass, and every Adam model has its own menu route for it. The second is a full calibration by an accredited provider, which produces a report with uncertainty and traceability. In an Australian business or laboratory you need both, and they do different jobs.
This guide covers the keypad procedure, the weights and conditions Adam manuals ask for, how to confirm the result, how often to repeat it, and when to call a NATA-accredited provider. We are PCS Precision, and we calibrate and service Adam scales alongside many other brands.
People search for “Adam scales calibration” and usually find manuals and videos. Those explain how to adjust the scale. They do not explain what an auditor expects to see.
Adjustment (user calibration). You place a known mass on the pan and tell the scale what it is. The scale corrects its internal span. It takes minutes and you can do it yourself.
Full calibration. A provider tests the instrument across its range with reference masses, then reports what it found. According to NATA’s guidance on balance user checks, a full report should include the limit of performance for each range, the repeatability standard deviation, and the largest scale reading correction with its expanded uncertainty.
The adjustment makes the scale read correctly against your mass today. Only the report shows how far the scale was out before adjustment, how repeatable it is, and whether the standards used were traceable. If your quality system, customer or regulator asks for calibration evidence, the keypad routine alone will not satisfy them.
Adam manuals name the mass type for each series. For the CORE (CQT) balances, the manual asks for a weight of known accuracy suited to the balance, such as OIML Class M1 or ASTM E617 Class 4. Other models specify the value they want, and some accept a range. Check the exact value in your manual rather than assuming the nominal capacity.
Two practical points:
The CQT manual lists the conditions to avoid: drafts, vibration, unstable power, temperature extremes, direct sunlight and air-conditioning vents. It also asks for a firm, flat surface and an unloaded pan. These are not formalities. A balance next to a door, a compressor or a vent will drift while you calibrate, and you will adjust it to a moving target.
Level the instrument first. Most bench and analytical models have a bubble level and adjustable feet. Allow warm-up time as specified in the manual, then calibrate.
Hanging scales need extra care. The IHS manual says slings, chains or other support material should be hung from the scale before you set zero, so only the calibration mass is measured. Skip that step and your adjustment includes the weight of the rigging.
Platform scales with higher capacities need heavier masses, and block-style masses are normally used for that. If you are working through a platform scale, our guide to platform scale calibration prechecks lists what to confirm before the certificate is issued.
The steps vary by series, so treat the following as an example and not a universal recipe.
On the ABW, according to the ABW user manual:
Other Adam series, such as the Highland, Nimbus, CPWplus and Warrior, use different key sequences and sometimes different prompts. The pattern is similar: empty the pan, zero, load the mass, confirm. The details are not. Always download the manual for your exact model number and revision. Adam publishes them in its support section as PDF files, and the model number is on the rating label.
Some systems are calibrated as a pair. The Warrior manual states that the platform and indicator are calibrated together and must be used together. If you swap an indicator between platforms, you invalidate the calibration. Label each pair and keep them together.
A failed adjustment usually has a simple cause. The Warrior manual notes that a disturbance can prevent a successful calibration, and the fix is to retry with the scale stable. Work through this list first:
If the scale still fails after you have fixed the environment and the procedure, stop. The manual’s advice is to contact the supplier or Adam Equipment. Repeating the routine over and over can hide a real fault such as a damaged load cell, moisture ingress or mechanical overload. At that point you need a technician and a workshop or on-site visit, not another attempt. Our repair and maintenance services cover Adam models and other brands, whether or not you bought the scale from us.
Adjusting a scale does not prove it is accurate across its range. You need a check you can repeat and compare.
NATA’s guidance describes a single-point user check. You place a calibrated, stable mass on the pan, and it tells you whether sensitivity has changed significantly since the last full calibration. The mass should typically be at least 80% of the balance range where practical, centred and evenly distributed. You then compare the correction you observe with the correction at that load on your last calibration report. Repeatability checks can be compared with the report in the same way.
That comparison is the point. A reading that is close to nominal tells you little. A reading that matches what the report said the scale does at that load tells you the scale has not moved.
For the tolerance question, our article on four tests to verify balance calibration tolerance goes into the numbers technicians use.
There is no single interval for every scale. Two sets of guidance help.
The ABW manual recommends calibration before use, when first installed, and whenever the scale moves to a different environment. That covers the keypad adjustment. Moving a scale across a site changes temperature, levelling and gravity-related conditions slightly, and you should not skip the step.
For checks, NATA notes that single-point user checks may typically be repeated monthly. It also says that following the described method may allow the recalibration interval to be extended, depending on your requirements. In other words, good check data is what lets you defend a longer interval. If your checks drift, shorten it.
This is why we encourage clients to keep as-found data from each calibration. Our piece on using as-found data to defend calibration intervals explains how to set an interval from evidence. For the wider business case, see why regular calibration is critical for industrial accuracy.
A reasonable starting point is to base the interval on risk:
| Use of the scale | Consequence of error | Approach |
|---|---|---|
| Release testing, pharma or food formulation | Product, batch or compliance impact | Full calibration by an accredited provider, with regular user checks between visits |
| Production weighing against specification | Yield, giveaway or customer complaints | Full calibration on a set cycle, with check data to review it |
| General workshop or dispatch weighing | Low | Check routine plus calibration when checks drift |
The intervals themselves are your decision, and your quality system or customer requirements may fix them for you.
If you work in a regulated or audited environment, the paperwork matters as much as the adjustment. NATA’s guidance on balances sets out the following:
When you receive a certificate, read it before you file it. Confirm that it carries the NATA endorsement, identifies your scale by serial number, lists the reference standards used, and states uncertainty. Our overview of NATA calibration standards in Australia explains what each element means, and the NIST versus NATA certificate checklist helps quality managers decide whether an overseas certificate will stand up in an Australian audit. If you work with analytical balances, the audit-ready balance calibration procedure shows the technician’s side, and for very fine weighing the microbalance calibration SOP applies.
Keep these for each scale:
Those records let you show an auditor a continuous story, not a single certificate.
We see the same pattern on Adam scales in plants and labs across New South Wales and beyond. A scale is adjusted at the keypad, shows PASS and goes back into service. Nobody records what it read before the adjustment, and nobody can say whether product weighed last month was in tolerance.
Our view is that the keypad routine is useful housekeeping and should stay in your procedures. It should never stand in for an accredited calibration where a customer, regulator or standard asks for traceability. We are NATA accredited and ISO 9001 certified, we calibrate on site or in our workshop, and we work on multiple brands regardless of where you bought the equipment. That means an Adam scale, a Mettler Toledo balance and a hanging scale from another maker can sit on one schedule with one set of records.
If you can only change one habit, record the as-found reading every time. It costs seconds and it is the evidence that tells you whether your interval is right.
— Kaz
We provide NATA calibration and traceable calibration for scales and balances, along with preventative maintenance, repairs, trade verification and equipment hire. You can see the full range on our calibration services page, and our How It Works page explains the process from booking to certificate. We offer 24/7 emergency support for urgent failures, and we quote to your site and instruments. We do not publish prices for these services, so contact us for a quote.
If you are replacing a scale, our full range of balances and scales includes bench scales, precision balances, analytical balances and hanging scales.
Yes, you can adjust it with a known mass using the procedure in the manual for your model. That is a user calibration. It does not produce a report with uncertainty and traceability, so for audited work you still need a full calibration from an accredited provider.
It depends on the model. The CORE series manual asks for a known-accuracy weight such as OIML Class M1 or ASTM E617 Class 4, and other series state the value or range they require. Check the manual for your exact model and use a mass with a current certificate.
The display may show PASS, as on the ABW, but that only confirms the adjustment ran. Follow it with a single-point check using a calibrated mass and compare the result with the correction on your last calibration report.
Calibrate before first use, after moving the scale to a new environment, and on the cycle set by your quality system. Monthly single-point checks are typical, and good check data can support a longer full-calibration interval.
Call one when the scale keeps failing after you have removed drafts, vibration and load from the pan, or when check results drift outside tolerance. Adam’s own guidance for persistent problems is to contact the supplier or the manufacturer.
