Vacuum Calibration Services
Quick Reference Table
| Description | Factory | NIST Traceable | ISO 17025 Accredited |
| Electrical verification | Yes | No | No |
| Vacuum comparison calibration to NIST traceable references | No | Yes | Yes |
| Reference standard uncertainties included | No | No | Yes |
| ISO 17025 accredited calibration | No | No | Yes |
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Options for Calibrations
1. ISO 17025 vacuum calibration: The Fredericks Company is ISO/IEC 17025 accredited for vacuum and pressure calibration in the range of 1E-6 Torr to 1000 Torr. Units are vacuum calibrated (on a vacuum stand) in nitrogen gas at various points (gauge dependent) against reference standards traceable to NIST, using systems that are accredited to ISO 17025. This includes incoming (as found) data, outgoing (as left) data after calibration adjustments, and the reference standard uncertainty at each calibration point. A statement of conformity using a simple decision rule is included. The conformity decision is made by comparing the measurement results to the calibration limits, defined by the form downloadable here Televac® Calibration Tolerances, without including measurement uncertainty.
2. NIST traceable vacuum calibration: The Fredericks Company offers NIST traceable calibration, where units are vacuum calibrated (on a vacuum stand) in nitrogen gas at various points (gauge dependent) against reference standards traceable to NIST. This includes incoming (as found) data, outgoing (as left) data after calibration adjustments, but does not include the reference uncertainty at each point (ISO 17025 accredited calibration does include uncertainties).
3. Factory (previously called “standard”) calibration: The Fredericks Company offers factory calibration, where units are electrically verified using electrical equipment only. The verification includes checking that the units provide vacuum readings within a specified tolerance when a specific electrical signal is applied. This is not a vacuum calibration, and does not guarantee that a sensor will read accurately when connected to a controller or active gauge. This is because sensor contamination and sensor to sensor mechanical variability cannot be accounted for with an electrical verification.
Calibration Points
Default vacuum calibration points can be found on our Televac® Calibration Tolerances page. Additional points can be ordered for ISO 17025 accredited and NIST traceable calibrations, and are an additional charge per point. Additional points must be included on your service order request form, they must be shown on our order acknowledgement, and they must be included on your purchase order (if applicable).
Part Numbers
| Part Number | Description |
| 17025-CAL-1 | Default vacuum calibration points for controller and gauge combinations as shown on Televac® Calibration Tolerances, quantity 1 per gauge calibrated |
| 17025-CAL-1-N | The same as 17025-CAL-1, but at a reduced price for a new controller or active gauge |
| 17025-CAL-XPT | If a point isn’t shown on Televac® Calibration Tolerances, there’s a per point charge for extra points that’s assigned this part number |
| NIST-CAL-1 | Default vacuum calibration points for controller and gauge combinations as shown on Televac® Calibration Tolerances, quantity 1 per gauge calibrated |
| NIST-CAL-1-N | The same as 17025-CAL-1, but at a reduced price for a new controller or active gauge |
| NIST-CAL-XPT | If a point isn’t shown on Televac® Calibration Tolerances, there’s a per point charge for extra points that’s assigned this part number |
| FACT-CAL-1 | Default factory (electrical test) calibration points for controller and gauge combinations as shown on Televac® Calibration Tolerances, quantity 1 per channel or gauge calibrated |
Recommended Calibration Intervals
The recommended calibration interval (how often you send your equipment in for calibration) for any type of vacuum calibration is entirely dependent on your specific requirements and quality systems. For example, your facility may adhere to specific standards that require quarterly, semi-annual, or yearly calibrations of vacuum measurement equipment. Or you might expose your vacuum gauges to heavy contamination and you just want to feel confident in the readings. Our default recommendation is a 1 year calibration interval, which will be listed on your calibration certificate and the equipment’s calibration sticker, unless a different interval is requested.
ISO 17025 Calibration More Details
NIST Traceable Calibrations More Details
Factory Calibrations More Details
Vacuum Calibration Services
