400DGC Differential Pressure Gauge – Large Convoluted Diaphragm

Our new line of high-precision, high-pressure differential pressure gauges is available into the 2% accuracy range. Through innovative design and manufacturing methods, these new products firmly establish our price and quality leadership in this specialty industry.


A close-coupled magnetic rack and pinion design uses high-quality magnets to achieve superior accuracy and the most linear scales in the industry. Our gauges are calibrated in the ascending pressure mode for the most common applications, such as filtration monitoring.  For special requirements, such as leak detection, we can calibrate the gauges in descending mode.

  • Ranges from 0.02 to 1.8 PSID
  • Can have a zero center dial
  • Great for leak tests
  • For very low differential pressure ranges
  • Electrical switch options


Every precision gauge we sell is individually tested and serialized. Certification of calibration is available.

Accuracy: ±2% of the FSD (Ascending)
Migration: No migration : Zero leakage from high to low port
Range: 0-25 to 0-600 mm H2O or similar ranges in other units
First Marking on The Scale: 15% of the FSD
Sensing Element: Diaphragm
Wetted Parts: Diaphragm, body material, SS 302 Spring & Ceramic Magnet
Case Material: Stainless Steel (SS 304)
Dial Size in Inch (mm): 3.5″ (80), 4″ (100), 4.5″ (115) & 6.0″ (150)
Mounting: Direct, front flange & 2″ pipe mounting
Maximum Working Pressure: 500 psi
Maximum Process Temperature: 175ºF/80ºC
Body Material: Aluminum, SS 316
Seals/Diaphragms: Buna-N, & Viton
Window: Float glass (Std.), toughened glass & acrylic on request.
Connection: 1/4″ NPT(F) Std. optional BSP(F) with adapter on high side
Porting: In-line, rear, bottom
Over Range Protection: Up to the max. working pressure from high side
Protection for Gauge & Switch: IP65/NEMA-4