Field service notice / action required
Meridian Pro units built after March 2026 carry a revised reference cell. Bench testing shows drift inside tolerance for twelve months, so the interval doubles. Units built before that date keep the six month interval.
Calibration interval for Meridian Pro serials M7-2026-0400 and above: six months becomes twelve.
Any site running a Meridian Pro built after March 2026. Meridian Bench and Field Kit are unaffected.
Read the serial from the rear plate, then reset the interval in the service menu and log the change.
Before the next scheduled calibration, or by December 31, 2026, whichever comes first.
Background
The reference cell in Meridian Pro was revised in March 2026. The replacement part holds its zero point far longer than the part it replaced, which is what set the original six month interval. Forty units from two production lots were held on the bench for fourteen months, with drift measured every thirty days. Every unit stayed inside the published tolerance band.
On that evidence the interval for the affected serial range moves to twelve months. Nothing else changes: the tolerance band, the procedure, the fee, and the certificate format are unchanged. Sites that prefer the shorter interval may keep it.
Scope
| Model | Serial range | Built | Interval now | Interval after | First due |
|---|---|---|---|---|---|
| Meridian Pro | M7-2026-0400 and above | March 2026 onward | 6 months | 12 months | At next service |
| Meridian Pro | M7-2024-0001 to M7-2026-0399 | Before March 2026 | 6 months | 6 months | No change |
| Meridian Bench | All | All | 12 months | 12 months | No change |
| Meridian Field Kit | All | All | 12 months | 12 months | No change |
If your site holds an Atlas Care Plus plan, the interval is held centrally and the change is already applied. Sites on Atlas Care, or on no plan, should follow the steps on page 2.
Procedure
Reference
| Service | What it covers | Turnaround | Price |
|---|---|---|---|
| Calibration | Full calibration against the reference standard, certificate included | 3 business days | $180 |
| On-site training | Service menu, interval management, and log practice for up to eight people | Booked to your date | $650 per day |
| Atlas Care | Scheduling, priority phone support, and one calibration a year | Standard 5 business days | $89 per month |
| Atlas Care Plus | Everything in Atlas Care, plus central interval management and loaner cover | Priority 2 business days | $149 per month |
| Meridian Pro | Replacement unit, revised reference cell fitted from the factory | Standard 5 business days | $7,900 |
Nothing breaks. The unit keeps the six month interval and calibrations continue at the published rate, so a site that does nothing will be booked and billed for roughly twice the calibrations it now needs. The interval can be changed at any later date, and a technician can set it during any visit.
Contacts
Account Manager
Serial lists, scheduling, and plan changes.
jordan.vale@apexinstruments.example
(555) 010-0100
Operations Lead
Calibration bookings and turnaround questions.
morgan.reyes@apexinstruments.example
(555) 010-0142
Customer Success Lead
Training, service logs, and site records.
avery.kellen@apexinstruments.example
(555) 010-0177
Apex Instruments, 400 Meridian Way, Suite 200, Tampa, FL 33602. This notice is written once and published twice: as the page you are reading and as the PDF your service binder holds. Both come from the same file.