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Black steel low-pressure diaphragm gauge 2-1/2 inch dial bottom connection

Value Brand

Value Brand Low Pressure Diaphragm Gauge 2-1/2 In 18C778

SKU CH-24JQ-3AXA5

Low pressure diaphragm gauge model 18C778 reads with 1.5 percent accuracy

  • Product typeElectronic
  • Accurate low-pressure readings with ±1.5 % precision
  • Diaphragm sensor suits gentle pressure ranges
  • Steel case and polycarbonate lens resist daily wear
  • Copper-alloy internals handle compatible media reliably
  • ¼ in NPT male bottom connection fits standard ports

Low Pressure Diaphragm Gauge

This low pressure diaphragm gauge is built for technicians who need reliable readings on low-pressure gas or air lines. The 2-1/2 inch dial provides clear visibility in workshop or field settings. It is intended for professionals and serious DIY users who work with pneumatic systems. Not suitable for buyers who require high-pressure hydraulic measurement or digital data logging.

Accuracy ±1.5 Percent

The gauge delivers an accuracy of ±1.5 percent of full scale, which is the critical specification for verifying system performance. A copper alloy diaphragm sensor and copper alloy socket handle the media directly. The 1/4 inch male NPT bottom connection threads into standard fittings. Not for buyers who need a tighter tolerance such as ±0.5 percent or a different process connection size.

Straightforward NPT Installation

Installation consists of threading the 1/4 inch male NPT connection into the matching female port using appropriate sealant. The steel case and polycarbonate lens resist typical workshop knocks but the gauge is not panel-mountable. Common issues include over-tightening which can damage the diaphragm sensor or strip the brass threads. No hazardous location rating applies.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $22.99
Cheaper than about 74% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameZoro Select
Product typeElectronic

Questions about this item

What does the ±1.5% accuracy mean when the gauge is installed?

The reading will stay within 1.5% of the true pressure across the calibrated range.

What does the 1/4 in NPT male connection limit in practice?

It mates with 1/4 in NPT female ports only; thread sealant is required for a leak-tight seal.

What clearance does the 2-1/2 in steel case and bottom mount need?

Allow space for the 2-1/2 in diameter case plus the 1/4 in NPT male fitting protruding from the bottom.

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