FlexCal, DeltaCal & TetraCal Service & Calibration 

Effective June 23, 2026, all service, calibration, and repair for FlexCal, DeltaCal and TetraCal instruments is handled by TPF Control, Mesa Labs' authorized service partner based in the Netherlands.

1. Email TPF Control at service@tpf-control.nl
2. Include: product model, serial number, description of the issue or service needed, and any relevant photos or documentation
3. TPF will acknowledge your request and send you an RMA number and shipping instructions
4. Ship the unit only after receiving your RMA number — do not ship to Mesa Labs
5. TPF completes the work and ships the unit back to you directly

In most cases, no. Service and calibration for FlexCal, DeltaCal, and TetraCal is handled directly by TPF Control at service@tpf-control.nl.

A limited exception applies to customers who are restricted from shipping to or doing business with companies outside their own country and therefore cannot transact directly with TPF Control in the Netherlands. Those customers may route service through Mesa Labs’ Lakewood facility. Contact your Mesa Labs account manager or customerservice@mesalabs.com to confirm whether this applies to your organization.

Complaints received by Mesa Labs through June 23 will be coordinated with TPF for resolution. All other requests after June 23 should go directly to TPF.

This route is available only to customers who are legally or organizationally restricted from shipping to or doing business with companies outside their own country. If that applies to you:

1. Submit the applicable Mesa Labs RMA form (FlexCal RMA form or DeltaCal/TetraCal RMA form) and wait for Mesa Labs authorization, including the quotation, RMA authorization, and Lakewood shipping instructions. Do not ship until these are received.
2. Ship the unit to the Mesa Labs Lakewood, CO facility with the RMA information included.
3. Mesa Labs consolidates eligible units every one to two weeks and forwards them to TPF Control.
4. TPF Control performs the work and issues the certificate under its ISO/IEC 17025:2017 accreditation.
5. Mesa Labs completes the transaction and returns the serviced unit to you.

Because units are consolidated before shipment, this route has a longer turnaround than shipping directly to TPF. The RMA for this route is issued by Mesa Labs Customer Service. For the standard direct route, the RMA is issued by TPF.

If your unit has an issue or complaint, notify TPF Control at service@tpf-control.nl before shipment and state that Mesa Labs will be shipping the unit. Include the product model, serial number, a description of the issue, relevant photos or documentation, and a PO if required. Place a printed copy of the complaint description with the instrument. TPF returns a complaint summary with the calibration certificate.

• Product model (e.g., DC1, TC12)
• Serial number
• Clear description of the issue or type of service needed
• Relevant photos, files, or supporting documentation (if applicable)
• Purchase order number (if required by your organization)

After completing the required evaluation, service, calibration, or repair, TPF Control will ship the unit directly back to you along with the applicable calibration certificate.

All product complaints after June 23, 2026 should be directed to TPF Control at service@tpf-control.nl. All complaints are recorded and reviewed under TPF's quality procedures. Complaints received by Mesa Labs prior to June 23 will be coordinated with TPF for resolution.

Yes. TPF Control holds ISO/IEC 17025:2017 accreditation under the Dutch Accreditation Council (RvA), a signatory to the ILAC Mutual Recognition Arrangement (ILAC MRA). This means:

• Calibration results are recognized as equivalent across all ILAC MRA member countries, including the United States
• All work meets EPA air monitoring requirements for traceability and technical validity
• Calibration is traceable to SI units consistent with NIST traceability principles

Yes. Mesa Labs has managed this type of partner transition with other product lines before. TPF Control's ISO/IEC 17025:2017 accreditation is the internationally recognized standard, and their certificates carry the same regulatory weight.

For customers with auditors or compliance teams requiring formal documentation, please refer to the Accreditation Statement (Appendix B of the Customer Notification Letter). This is available from your Mesa Labs account manager or by emailing customerservice@mesalabs.com.

NIST does not approve individual laboratories or certificates directly. However, TPF Control's calibrations are traceable to SI units in a manner consistent with NIST traceability principles. ISO/IEC 17025 accreditation by an ILAC MRA notified body (such as RvA) satisfies EPA air monitoring requirements for calibration traceability and technical validity.

No change for DeltaCal and TetraCal. All new build orders for DeltaCal, TetraCal, and related accessories continue to be placed directly through Mesa Labs, the same as before. Submit purchase orders to your account manager or customerservice@mesalabs.com.

The following instruments and accessories are covered:

• Flow Calibrator Instruments: DC1, DC100, DC200, TC12, TC5, TC17, TC14
• Parts & Accessories: DC3, 188125, CA9030, 188166, TC9, B2271, A2253, A2254, A2255, B2248

New build orders for DeltaCal and TetraCal continue through Mesa Labs. FlexCal is discontinued and is not available as a new build. Service and calibration for all units, including existing FlexCal units, is directed to TPF Control effective June 23, 2026.

TPF Control is a Mesa Labs authorized calibration and service partner with over 20 years of experience. They are fully capable across gas flow, temperature, pressure, and humidity measurement, and hold ISO/IEC 17025:2017 accreditation under the Dutch Accreditation Council (RvA).

Mesa Labs is directing concentrated internal capacity toward PQ air sampler volume.  By partnering with TPF for FlexCal, DeltaCal, and TetraCal service, we are ensuring product availability, reducing lead times, and maintaining uninterrupted service continuity, with no reduction in quality or compliance.  Learn more at tpf-control.nl.

No. DeltaCal and TetraCal remain active products. This transition reflects Mesa Labs' continued commitment to the product line. 

All new build orders for DeltaCal, TetraCal, and related accessories continue to be placed directly through Mesa Labs, the same as before. Submit purchase orders to your account manager or customerservice@mesalabs.com.

TPF Control will continue manufacturing new units and providing all service activities, ensuring availability and responsiveness for customers.