BAS Sensor Calibration Field Verification
BAS Sensor Calibration Field Verification records field comparisons for temperature, pressure, humidity, and CO2 sensors against a calibrated reference instrument, then documents controller offsets and deficiencies.
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Overview
BAS Sensor Calibration Field Verification is a field audit template for comparing building automation system sensor readings to a calibrated reference instrument and documenting any offset needed at the controller or in BAS software. It is built for temperature, pressure, humidity, and CO2 points, with room to note the facility, building, system, sensor point, controller point, environmental conditions, and the exact reference instrument used.
Use this template when a sensor is suspected of drift, after replacement or re-commissioning, during scheduled maintenance, or whenever a comfort, ventilation, or pressure-control issue needs a documented check. The form walks the inspector through a safe-access check, reference instrument validation, reading comparison, offset calculation, controller adjustment, and post-adjustment verification so the record shows both the problem and the correction.
Do not use it as a substitute for a laboratory calibration certificate or for systems that require a specialized commissioning protocol. If the sensor is inaccessible, the area is unsafe, the reference instrument calibration is expired, or the point is outside the template’s scope, the inspection should stop and the deficiency should be recorded. The template is most useful when the goal is to prove whether the BAS point is reading within tolerance, identify drift, and leave a clear trail for corrective action and sign-off.
Standards & compliance context
- This template supports documented maintenance and verification practices commonly used in OSHA-aligned facility programs and internal safety management systems.
- For life-safety or smoke-control related points, align the verification with applicable NFPA requirements and the AHJ’s expectations before making adjustments.
- For healthcare, foodservice, or controlled-environment spaces, add the facility’s governing standard or owner requirement so the record reflects the correct tolerance and frequency.
- If the verification involves energized panels, ladders, or mechanical spaces, follow site safety procedures and applicable OSHA safe-work practices before accessing the point.
- When the sensor supports a quality or environmental control process, retain the record as part of the facility’s QMS or preventive maintenance history.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Details and Scope
This section defines exactly which facility, system, and sensor point are being verified so the record cannot be confused with another BAS location.
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Facility, building, and system identified
Enter the site name, building, BAS system, and controlled area or zone being verified.
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Date, time, and inspector recorded
Document when the field verification was performed and who completed it.
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Sensor point and controller point identified
Identify the sensor tag, point name, controller address, and associated BAS loop or zone.
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Verification scope includes temperature, pressure, humidity, and CO2 as applicable
Select all sensor types included in this verification.
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Sensor is accessible and safe to test
Confirm the sensor, test port, or sampling location is reachable without unsafe access, exposed conductors, or other hazards.
Reference Instrument Verification
This section proves the comparison tool is trustworthy by capturing calibration status, identity, and the pre-check needed for valid field results.
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Reference instrument make, model, and serial number recorded
Document the calibrated reference instrument used for comparison.
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Reference instrument calibration is current
Confirm the reference instrument calibration certificate or sticker is valid and not expired.
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Reference instrument calibration due date recorded
Enter the calibration expiration or due date for the reference instrument.
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Reference instrument zero or ambient check completed
Verify the reference instrument was checked for zero, ambient, or baseline stability before use.
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Environmental conditions recorded during verification
Document ambient conditions that may affect readings, such as temperature, airflow, or condensation.
Sensor Readings and Offset Calculations
This section is where the actual comparison happens, showing the raw sensor value, the reference value, and the calculated offset.
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Temperature sensor reading and reference comparison recorded
Enter the BAS temperature reading and document the reference value and calculated offset in the comment field.
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Pressure sensor reading and reference comparison recorded
Enter the BAS pressure reading and document the reference value and calculated offset in the comment field.
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Humidity sensor reading and reference comparison recorded
Enter the BAS humidity reading and document the reference value and calculated offset in the comment field.
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CO2 sensor reading and reference comparison recorded
Enter the BAS CO2 reading and document the reference value and calculated offset in the comment field.
Controller Adjustment and Functional Check
This section confirms the BAS point was corrected at the controller or software level and then rechecked against the acceptable tolerance.
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Controller offset adjustment recorded
Document the offset value applied at the controller for each adjusted point.
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Adjustment made at controller or BAS software
Confirm the correction was applied at the controller, point object, or BAS workstation as required by site procedure.
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Post-adjustment reading within acceptable tolerance
Verify the sensor reading after adjustment is within the site’s acceptable tolerance or commissioning criteria.
Deficiencies, Corrective Actions, and Sign-Off
This section closes the loop by documenting non-conformances, required follow-up, and who accepted the completed verification.
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Deficiencies or non-conformances documented
Describe any sensor drift, failed comparison, damaged probe, unstable reading, or other deficiency.
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Corrective action required
Indicate whether follow-up repair, replacement, reprogramming, or re-verification is needed.
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Inspector signature
Inspector or technician signs to confirm the field verification record is complete and accurate.
How to use this template
- Enter the facility, building, system, sensor point, controller point, date, time, and inspector so the verification is tied to a specific BAS location.
- Record the reference instrument make, model, serial number, calibration status, due date, and zero or ambient check before taking any readings.
- Measure the applicable sensor type, compare it to the reference instrument, and calculate the offset for temperature, pressure, humidity, or CO2.
- Apply the offset at the controller or in BAS software, then recheck the point to confirm the reading is within the acceptable tolerance.
- Document any deficiencies, non-conformances, or access issues, assign the corrective action, and capture inspector sign-off after the verification is complete.
Best practices
- Use a reference instrument with current calibration and record the due date before the field check begins.
- Match the reference instrument to the sensor type and measurement range so the comparison is meaningful.
- Allow the sensor and reference reading to stabilize before recording the final value, especially for humidity and CO2.
- Document the pre-adjustment reading, the offset applied, and the post-adjustment reading in the same record.
- Note ambient conditions during the verification because temperature, airflow, and occupancy can affect readings.
- Photograph the sensor location, controller point, and reference setup when the site allows it.
- Flag any inaccessible, damaged, or unsafe sensor location as a deficiency rather than forcing a partial check.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this BAS Sensor Calibration Field Verification template cover?
It covers field comparison of BAS sensor readings against a calibrated reference instrument for temperature, pressure, humidity, and CO2 where applicable. The template also captures controller offset changes, post-adjustment checks, deficiencies, and corrective actions. It is designed for documenting verification, not for replacing a full laboratory calibration record.
When should this template be used?
Use it during startup, periodic maintenance, after a sensor replacement, after a complaint about comfort or ventilation, or when trend data suggests drift. It is also useful after control sequence changes or BAS graphics updates that may affect the displayed value. If the sensor is not accessible or the area is unsafe to test, the verification should be deferred and noted.
Who should complete the verification?
A qualified controls technician, HVAC technician, or commissioning agent should complete it, depending on site requirements. The person should understand the sensor type, the BAS point, the reference instrument, and how offset adjustments are made in the controller or BAS software. If the work affects critical building systems, follow the facility’s authorization and lockout or access procedures.
How often should BAS sensors be field verified?
Frequency depends on the facility’s maintenance program, sensor criticality, and environmental conditions. High-use or critical spaces may need more frequent checks than stable office areas. Use this template to support a planned cadence rather than waiting for occupant complaints or failed comfort checks.
Does this template satisfy regulatory or code requirements?
It supports documentation expected under building maintenance, energy management, and quality programs, but it is not a substitute for any site-specific compliance obligation. Facilities may align it with OSHA-safe work practices, NFPA-related building systems expectations, or internal QMS procedures. If the sensor supports regulated processes, add the applicable standard or owner requirement to the scope.
What are the most common mistakes when using this template?
Common mistakes include using an uncalibrated reference instrument, skipping the zero or ambient check, and recording only the final adjusted value without the pre-adjustment comparison. Another frequent issue is adjusting the controller without documenting who made the change and what tolerance was used. The template is most useful when the comparison, offset, and follow-up check are all captured in one record.
Can this template be customized for different sensor types or tolerances?
Yes. You can add site-specific tolerances, sensor model fields, sequence-of-operations notes, or additional points such as airflow or differential pressure. Many teams also add a pass/fail field, photo attachments, or a required sign-off from facilities or commissioning staff.
How does this compare with ad-hoc calibration notes in a work order?
Ad-hoc notes often miss the reference instrument details, environmental conditions, and the actual offset calculation. This template creates a repeatable record that makes drift, recurring deficiencies, and unresolved non-conformances easier to track. It also gives the next technician a clear baseline for follow-up work.
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