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PIC GAUGES

PIC Gauges is a US-based manufacturer of pressure and temperature instrumentation, with a product line that includes dial pressure gauges, diaphragm seals, and related accessories. The company was founded in 1946 and operates as part of the H.O. Trerice group. Its gauges are used across industrial sectors where local indication of pressure, vacuum, or compound ranges is required. 3G Electric supplies PIC Gauges products globally, with a focus on dial pressure gauges and diaphragm seal assemblies for corrosive, viscous, or solids-laden media.

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About PIC GAUGES

PIC Gauges is a US-based manufacturer of pressure and temperature instrumentation, with a product line that includes dial pressure gauges, diaphragm seals, and related accessories. The company was founded in 1946 and operates as part of the H.O. Trerice group. Its gauges are used across industrial sectors where local indication of pressure, vacuum, or compound ranges is required. 3G Electric supplies PIC Gauges products globally, with a focus on dial pressure gauges and diaphragm seal assemblies for corrosive, viscous, or solids-laden media.

The PIC Gauges range covers dial sizes from 1.5 in to 6 in, with accuracy classes including ±2-1-2% (ASME B40.100 Grade B) and ±1% (Grade A). Case materials include thermoplastic, phenolic, and stainless steel, with ingress protection ratings such as IP65 for washdown or dusty environments. Wetted parts are available in brass, 316 stainless steel, and specialty alloys. Diaphragm seals—also called mini-seals—isolate the gauge from process fluids using flexible diaphragms in PTFE, Viton, or 316 stainless steel, with fill liquids such as glycerin or silicone for damping pulsation and protecting against temperature extremes. Connection options include bottom mount, back mount, and panel-mount configurations, with NPT or BSP threads.

3G Electric stocks PIC Gauges products that address common maintenance and process challenges: measuring pressure in lines carrying corrosive chemicals, viscous fluids, or slurries; monitoring vacuum in condensers or vacuum pumps; and providing local indication where transmitters are not required. The supplied range includes 2 1/2 in dial gauges with thermoplastic seals for 0–100 psi and 0–60 psi service, compound gauges for vacuum and pressure, and low-pressure gauges with 316 stainless steel mini-seals for ranges such as 0–15 psi, 0–30 psi, and 30 in Hg to 0 in Hg. These instruments are used in chemical processing, water treatment, food and beverage, and general industrial applications where the process medium would clog or corrode a standard gauge.

For technical buyers, PIC Gauges products are specified by dial size, pressure range, accuracy, connection type, and wetted materials. The diaphragm seal assemblies add a layer of protection: the seal transmits pressure to the gauge through a fill fluid, keeping the gauge mechanism isolated from the process. This makes them suitable for applications with high viscosity, suspended solids, or aggressive chemicals. 3G Electric supports the line by providing product data, configuration options, and global logistics for replacement and new installations. The catalog includes both standard and application-specific configurations, with SKUs that map to common pressure ranges and seal materials.

Common Applications

  • Chemical processing — PIC Gauges 2 1/2 in dial pressure gauge with thermoplastic seal (SKU 54XN83) for 0–100 psi corrosive media.
  • Water treatment — PIC Gauges low-pressure dial gauge with 316 SS mini-seal (SKU 54XN65) for 0–30 psi filtration lines.
  • Food and beverage — PIC Gauges compound gauge with diaphragm seal (SKU 19RZ40) for 0–30 psi vacuum and pressure monitoring.
  • Oil and gas — PIC Gauges 2 1/2 in dial gauge with Viton seal (SKU 19RZ39) for 0–60 psi viscous fluids.
  • HVAC — PIC Gauges low-pressure dial gauge with 316 SS mini-seal (SKU 54XN63) for 30 in Hg to 0 in Hg vacuum service.
  • General industrial — PIC Gauges low-pressure dial gauge with 316 SS mini-seal (SKU 54XN74) for 0–15 psi pneumatic systems.

Guides & Resources

Frequently asked questions

Common questions about PIC GAUGES from 3G Electric.

What is the difference between a PIC Gauges diaphragm seal and a mini-seal?

PIC Gauges uses the term 'mini-seal' for compact diaphragm seal assemblies that mount directly to the gauge inlet. A standard diaphragm seal may have a larger diaphragm and a separate flushing connection. Mini-seals are often used where space is limited or where the process connection is small, such as 1/4 in or 1/2 in NPT. Both isolate the gauge from the process fluid using a flexible diaphragm and a fill liquid. The choice depends on the required pressure range, process connection size, and whether cleaning or flushing is needed.

What wetted materials are available in PIC Gauges diaphragm seal assemblies?

PIC Gauges diaphragm seal assemblies are available with wetted parts in 316 stainless steel, PTFE, Viton, and other materials. The seal lower housing may be 316 stainless steel or thermoplastic. The diaphragm material is selected based on chemical compatibility with the process fluid. For example, PTFE diaphragms are used with highly corrosive media, while Viton is suitable for many oils and fuels. The fill liquid—glycerin or silicone—also affects temperature limits and compatibility. Always verify material compatibility with the specific process fluid.

What does ±2-1-2% accuracy mean on a PIC Gauges dial pressure gauge?

±2-1-2% accuracy is a shorthand for ASME B40.100 Grade B accuracy. It means the gauge accuracy is ±2% of span at the first and last quarters of the scale, and ±1% of span in the middle half. For a 0–100 psi gauge, the maximum error is ±2 psi at the low and high ends, and ±1 psi in the middle. This grade is common for general industrial service where precise measurement is not critical. PIC Gauges offers this accuracy in many of its 2 1/2 in dial gauges.

Can PIC Gauges low-pressure dial gauges with 316 SS mini-seal be used for vacuum service?

Yes. PIC Gauges offers low-pressure dial gauges with 316 stainless steel mini-seals that measure vacuum from 30 in Hg to 0 in Hg. These are available with a 2 1/2 in dial and bottom connection. The mini-seal isolates the gauge from the process, and the glycerin fill dampens pulsation. For compound ranges (pressure and vacuum), PIC Gauges also supplies gauges such as the 0 to 30 psi compound gauge with diaphragm seal. Confirm the specific model and range for your application.

What is the purpose of glycerin fill in PIC Gauges diaphragm seal assemblies?

Glycerin fill in a diaphragm seal assembly serves two purposes: it transmits pressure from the diaphragm to the gauge movement, and it dampens pulsation or vibration that could cause pointer flutter and wear. Glycerin is suitable for many industrial applications but has temperature limits—typically -20°F to 200°F. For higher temperatures or specific chemical compatibility, silicone fill may be used. The fill liquid is selected based on the process temperature and the required response time. PIC Gauges specifies the fill liquid for each seal assembly.

Are PIC Gauges dial pressure gauges available with panel-mount configurations?

Yes. PIC Gauges offers panel-mount configurations for many of its dial pressure gauges. Panel-mount gauges have a back connection and a mounting flange or U-clamp that secures the gauge to a panel. This is common in control panels, test stands, and equipment skids. The dial size, pressure range, and connection type can be specified. 3G Electric supplies PIC Gauges panel-mount options as part of its catalog. Check individual product specifications for panel-mount availability.