SMS-Union Pressure Gauge

An SMS union below the dial

The gauge combines a round dial case with a union assembly beneath it. The SMS connection uses a male end and union nut, providing a different mating arrangement from a Tri-Clamp ferrule or a small threaded instrument port. Match the complete union interface when specifying a replacement gauge.

Dry and glycerin-filled choices

Dry and glycerin-filled versions are listed for this series. Choose the required fill version together with the measuring range and dial units, and identify these choices in the instrument specification. Recording them as a complete set helps describe the actual gauge being ordered for the intended observation point.

Materials and mating dimensions

The listed stainless steel options are AISI304 and AISI316L. Compare the mating male part, nut thread and sealing arrangement with the existing SMS port. Allow working space around the nut; nearby pipework or supports should not obstruct access needed to disconnect the instrument for service.

A readable local pressure indication

The pointer and marked scale provide a pressure reading at the measurement point. Choose the measuring span to suit the observation point and keep the dial visible from the inspection route. Routine care includes checking the external union condition, maintaining dial legibility and scheduling calibration through the instrument maintenance process.