Check the Pressure Canner's Dial Gauge Before the Season

Check the instrument before planning the batch

The canning recipe may be research-tested while the gauge on the equipment has not been checked for years. Those are different parts of preparation. Before buying a season’s ingredients, identify the actual pressure canner and whether it uses a dial gauge. The printed face and a moving pointer do not establish measurement accuracy.

Find the manufacturer’s instructions for that model and its current gauge. Do not assume instructions from a similar-looking canner apply, or that a weight attached to the lid makes every dial reading unnecessary. Equipment designs differ. The household’s first job is to establish what it owns and which inspection or testing instructions belong to it, without attempting a pressure experiment to see what happens.

Source: NCHFP: Pop Quiz - What Time Is It? Dial Gauge Testing

Use the testing guidance for this gauge

The National Center for Home Food Preservation says dial gauges need accuracy testing before each canning season and after dropping or banging the gauge. It identifies the manufacturer as the best source for inspection and testing instructions. Some manufacturers require mailing the gauge for service; some local Cooperative Extension offices can test certain brands when trained staff are available.

Ask the appropriate office or maker before arriving with the equipment. Confirm the brand, what component should be brought or sent and whether that location can perform the check. An appointment request is not a completed accuracy test. Do not claim all Extension offices offer the same service or copy another household’s result as evidence about your own instrument.

Source: NCHFP: Pop Quiz - What Time Is It? Dial Gauge Testing

Keep the actual result with the equipment

After qualified testing, retain the result and any instructions about repair, replacement or permitted adjustment. Use the applicable manufacturer and preservation guidance to resolve those instructions. This article does not supply a do-it-yourself calibration method, processing correction or acceptable error calculation. An unclear result should remain a reason to ask before using the gauge.

In a hypothetical preparation, an adult finds a tested recipe but no current gauge record. The adult contacts a suitable testing service and postpones the planned pressure-canning session until the equipment question is resolved. That choice does not invalidate the recipe. It recognizes that a good set of directions cannot verify the instrument used to carry them out.

Source: NCHFP: Pop Quiz - What Time Is It? Dial Gauge Testing

Resume the full preservation check afterward

An accuracy check addresses the gauge; it does not certify the entire canner or every future batch. Follow the model’s other inspection and operating instructions and the complete research-tested preservation directions. Keep recipe suitability, altitude instructions and equipment readiness connected without pretending one checked item completes them all.

Use the notes for gauge identity, testing route, actual result status and the next needed action. Retain detailed service records with the equipment privately. A different household borrowing the canner needs the relevant instructions and known status too. Faithful preparation includes the quiet equipment work before jars are filled, when changing the plan is still easier than trying to explain an uncertain reading in the middle of processing.

Source: NCHFP: Pop Quiz - What Time Is It? Dial Gauge Testing

Put it into practice