Overview
Sensor calibration ensures that your people-counting sensors accurately detect visitors entering and exiting a location. This article covers when calibration is needed, what to prepare before a calibration session, and how the process works — both remotely and on-site.
When is Calibration Needed?
Calibration may be required in the following situations:
Initial setup of a new sensor at a new location
After a sensor has been physically repositioned or reinstalled
After structural changes at the entrance (e.g. new door, signage, display unit in the counting zone)
After a firmware update that affects detection parameters
When sustained IN/OUT discrepancies above 15% are observed
When reported visitor counts are significantly higher or lower than manual counts
After a store renovation or layout change affecting the entrance area
Remote Calibration
Most sensor calibration adjustments can be performed remotely by the Vemco technical team without a site visit. Remote calibration covers:
Adjusting the counting line position and angle
Modifying detection sensitivity thresholds
Setting or updating exclusion zones (e.g. staff areas, columns, display units)
Correcting counting direction
How to Request Remote Calibration
Submit a support ticket with the following information:
Location name and Vemcount location URL
Description of what changed (renovation, sensor moved, etc.) and the date the change occurred
Date range during which data looks incorrect
Any reference images of the entrance area if available
On-Site Calibration and Site Survey
An on-site visit is required when:
The sensor needs to be physically repositioned or remounted
A new installation is being validated before going live
Remote calibration has not resolved a persistent accuracy issue
A full site survey is needed to plan sensor placement for a new location
What to Prepare for a Site Survey or On-Site Visit
Floor plan or entrance drawings: Provide the site layout, ideally in PDF or CAD format, showing entrance dimensions and ceiling height.
Access confirmation: Ensure the Vemco technician has access to the entrance area, including any locked zones.
Internet connectivity: Confirm that a stable network connection (ethernet preferred) is available at the sensor installation point.
Ceiling height: Provide the ceiling height at the planned sensor mounting point — this affects the sensor model selection and mounting angle.
Contact person on-site: A store representative should be available during the visit to grant access and confirm the final sensor placement.
Requesting an On-Site Visit
Submit a support ticket with:
Location name and full address
Type of visit required (initial survey, calibration, or revalidation)
Preferred date(s) and time window
On-site contact name and phone number
After Calibration
Once calibration is complete:
The Vemco team will notify you and confirm the calibration is live.
Monitor the IN/OUT balance in Vemcount for the following 24–48 hours to confirm accuracy has improved.
If discrepancies persist, reply to the original ticket with updated data and screenshots.
Historical data from before the calibration date is not automatically corrected — request a data adjustment ticket if needed.
Accuracy Verification
To independently verify sensor accuracy:
Conduct a manual count at the entrance over a 15–30 minute period.
Compare the manual count against the Vemcount live or hourly data for the same period.
Share the comparison in your support ticket — this significantly speeds up diagnosis.