How to Calibrate an Analytical Scale – Step-by-Step Guide

⚖️ Introduction

An analytical scale is only as good as its calibration. Even the most high-end, NABL-certified balance can give incorrect readings if not calibrated regularly. Whether you’re running a pharmaceutical lab, a food testing facility, or an R&D center, accurate calibration ensures compliance, product quality, and safety.

At Shree Shree Weighing Solutions, we not only supply top-tier analytical scales across Gujarat but also provide on-site calibration and NABL stamping services. In this blog, we’ll walk you through how to calibrate your scale, what you need, and how often to do it.

🛠️ What Is Calibration?

Calibration is the process of setting your weighing machine to match a known standard. It ensures that the displayed weight matches the actual value. Without it, every reading becomes an estimate, and your lab results or formulations could fail.

There are two main types:

1. Internal Calibration – Done automatically by the machine itself (common in high-end models).

2. External Calibration – Requires certified standard weights and must be done manually.

🧪 What You'll Need for External Calibration

• NABL-certified standard weights (Class E2 or F1)

• A clean, vibration-free environment

• Calibration certificate for reference

• Tweezers or gloves (to avoid contaminating weights)

At Shree Shree Weighing Solutions, we provide both standard weights and certification across Ahmedabad and Gujarat.

🔧 Step-by-Step: External Calibration Process

Step 1: Warm Up the Scale
Turn on your digital analytical scale and let it warm up for 30 minutes for stable readings.

Step 2: Place the Scale on a Flat Surface
Ensure the platform is level and vibration-free. Use the leveling bubble and feet to adjust.

Step 3: Enter Calibration Mode
Press the “CAL” button on your scale. Some models may require a combination like “Mode + CAL”.

Step 4: Use the Prompted Standard Weight
The display will ask you to place a certain weight (e.g., 100g). Use certified weights only.

Step 5: Wait and Confirm
Let the balance stabilize and press “Enter” or “CAL” again. The system will auto-adjust its parameters.

Step 6: Test with Another Weight
After calibration, place a different known weight to verify accuracy.

🔄 Frequency of Calibration

• Daily: In high-stakes environments like pharma QC labs

• Weekly: In general-use labs or universities

• Monthly: For non-critical or infrequent use

We offer Annual Calibration Contracts (AMC) across Gujarat, ensuring your machines always meet compliance standards.

📜 Legal Compliance: NABL & Legal Metrology

Many industries in Gujarat are legally required to:

• Use NABL-certified scales

• Calibrate machines every 6 or 12 months

• Maintain audit-ready records

We provide full support with certificates, stamping, and on-site documentation.

📍 Need Help with Calibration?

Our technicians are available across Baroda, Surat, Bhavnagar, Vapi, Rajkot, and beyond to assist with calibration, training, and AMC contracts.