Density Meters (DDM) – Air/Water Calibration Troubleshooting

Issue

Use this guide if your density meter is showing:

• Unstable readings
• Poor repeatability
• Questions or concerns related to the air check or water check

Applies to

• Density Meters (DDM)
• Handheld density meters, including models such as DDM 29

Before you begin

Make sure you have the following:

• A clean syringe for injections
• High-concentration alcohol for cleaning the system
• An external air source to fully dry the system

Recommended troubleshooting workflow

Follow this sequence to check air repeatability and water performance safely and consistently.

1. Turn on the instrument

Allow the unit to power on normally and prepare it for testing.

2. Clean the system

Using a clean syringe, wash the system with high-concentration alcohol.

3. Dry the system

Use an external air source to blow the system dry.

4. Check air repeatability

Run the air check and confirm the readings are repeatable.

• If air repeatability is poor, repeat the cleaning and drying steps again before retesting.

5. Inject water

Once the air check is stable, inject water into the system.

6. Measure water

Run the water measurement and compare the result to your expected specification.

• If the water result is not within specification, repeat the wash/dry cycle and test again.

Troubleshooting flowchart