Copper vs Stainless Steel Pressure Gauge Movements

Choosing between copper alloy and stainless steel pressure gauge movements starts with the complete instrument design. Specify the materials of the plates, gears and pointer shaft separately, and confirm the environment in which the movement will operate.

Separate movement materials from wetted parts

The movement transmits motion to the pointer. Process connections and sensing elements, such as the Bourdon tube, have their own material requirements. A stainless steel case or movement does not by itself establish the compatibility of the complete gauge with a particular process medium.

Compare the actual component specification

When requesting a quotation, identify the required material for each component rather than describing the entire assembly only as copper or stainless steel. Compare the dimensions, gear ratio, shaft fit and mounting arrangement at the same time.

Match the operating conditions

Tell the supplier about temperature, humidity, vibration and any exposure expected inside the case. For the complete gauge, select wetted materials according to the process medium and the instrument manufacturer's application guidance.

Information to send with an inquiry

• Movement model and drawing revision

• Plate, gear and shaft material requirements

• Mounting dimensions and pointer fitting

• Required quantity and sample inspection criteria

• Operating conditions for the complete instrument

Browse the FYAC100-G14T stainless steel movement and compare it with your drawing. Use our OEM inquiry checklist to prepare the technical details for review.