In accordance with A2LA (American Association for Laboratory Accreditation) guidelines we suggest that instruments be calibrated annually.

Reliable Instruments calibration procedure follows A2LA standards.

1. Instruments received for calibration are first checked for full functionality on all ranges, including sensor regeneration and battery capacity tests.

2. Instrument firmware is updated at no charge.

3. The AGF filter is replaced.

4. The flow rate is checked and corrected if necessary.

5. If more extensive repairs are required a repair estimate and request for purchase order is sent.

6. Once repairs are complete the instrument is checked for response and capacity at 50 micrograms per cubic meter Hg concentration. If required, the calibration constants are adjusted and the calibration check is repeated until the instrument is within specifications.

7. Calibration is repeated using a NIST certified cylinder of Hg vapor in N2, currently at 30.8 micrograms per cubic meter. (This value will change slightly as the cylinders are exchanged.)

8. A calibration certificate is prepared and returned with the calibrated instrument.

If no repairs are necessary the instrument is ready for return within 24 hours of receipt.