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Black steel low pressure diaphragm gauge with 2-1/2 inch polycarbonate lens and bottom 1/4 inch NPT male connection

Value Brand

Value Brand Low Pressure Diaphragm Gauge 18C786 2-1/2 in

SKU CH-SJBJ-1RY5X

Low pressure diaphragm gauge with ±1.5% accuracy, steel case, polycarbonate lens and 1/4 in NPT bottom connection

  • TypeElectronic
  • Accurate low-pressure readings with ±1.5% precision
  • Durable steel case protects internal components
  • Copper alloy sensor resists corrosion in service
  • 1/4 in NPT male connection fits standard fittings
  • Polycarbonate lens withstands impact and vibration

Low Pressure Diaphragm Gauge

The Value Brand 18C786 measures low pressure using a diaphragm sensor built from copper alloy. It connects through a 1/4 in male NPT fitting at the bottom. The steel case and polycarbonate lens protect the movement in workshop environments. This gauge suits technicians who need a direct-reading instrument for pneumatic or hydraulic checks.

Sustained Load Behaviour

Accuracy is rated at +/- 1.5 percent of span across the operating range. The diaphragm design maintains linearity without the hysteresis common in spring-tube gauges at low pressures. Copper-alloy wetted parts resist corrosion from air, water and compatible oils during extended use. No IP or NEMA rating is assigned, so the gauge should be shielded from wash-down or immersion.

Upgrade Path

This model replaces worn analogue gauges that have drifted beyond calibration or suffered diaphragm fatigue. The steel case and polycarbonate lens offer better impact resistance than plastic-cased alternatives. It is not panel-mountable, so builders needing flush mounting should select a different configuration. The jump is worth it when repeatability at low pressure matters more than a digital display.

Highlights

  • Accurate low-pressure readings with ±1.5% precision
  • Durable steel case protects internal components
  • Copper alloy sensor resists corrosion in service
  • 1/4 in NPT male connection fits standard fittings
  • Polycarbonate lens withstands impact and vibration

Specifications

BrandZoro Select
TypeElectronic

Questions about this item

Does the 1/4 in NPT male connection on this low-pressure diaphragm gauge require any special thread sealant for a leak-free fit?

Standard PTFE tape or pipe dope compatible with copper-alloy threads is sufficient; the 1/4 in NPT male socket seals without proprietary fittings.

What mounting hardware must I already have to install this 2-1/2 in steel-cased gauge on a panel?

The gauge is not panel-mountable, so you need a 1/4 in NPT female port on your piping or manifold to thread the bottom-mounted male connection directly.

Will the +/-1.5 % accuracy hold if I plumb this diaphragm gauge alongside an older 1/4 in NPT bourdon-tube gauge on the same line?

Yes, the copper-alloy diaphragm sensor and 1/4 in NPT male connection are mechanically compatible with legacy bourdon-tube gauges sharing the same thread size and pressure range.

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