Accessories for Pressure Gauges & Diaphragm Seals – mount safely, protect better

FAQ on Accessories for Pressure Gauges & Diaphragm Seals

Answers on selection, installation, materials, damping, temperature management, hygiene, calibration, and safety.

What are restrictors or snubbers used for?

They dampen pulsations and pressure spikes (e.g., at pumps), stabilize the display, and protect the mechanism/sensor. Types: capillary, sintered, or needle restrictors—choose according to the medium’s viscosity.

When should I use siphons or cooling sections?

With hot media (steam, >100 °C). Siphons (U or P form) create a condensate barrier; cooling sections reduce temperature at the instrument.

Which shut-off valves/manifolds are common?

How do I choose the right gasket?

By medium, temperature, and pressure: FKM/NBR for standard duties, EPDM for hot water/media, PTFE for chemical resistance, FFKM for very aggressive media. Observe FDA/EU 1935/2004 for hygienic use.

Which connection threads are common?

What mounting brackets and front flanges are available?

U-/front flanges for panel mounting, console/wall brackets for local indication, and pipe brackets (Ø 2") for field mounting—each matching DN 63/100/160.

How do I properly combine diaphragm seals and accessories?

First define process connection & diaphragm material (316L, Hastelloy®, Tantalum, enamel), then fill fluid (e.g., pharma/high-temp), capillary length, and accessories (shut-off, cooling, protection). Verify media and temperature compatibility.

Which fill fluid is suitable for diaphragm seals?

Based on temperature, viscosity, hygiene: silicone oils (general), high-temperature oils, FDA/USP-compliant fluids for food/pharma. Gas filling for very dynamic measurements.

Does glycerin filling always help on gauges?

It helps with vibration and mild pulsation (pointer damping). For strong pressure shocks also use a restrictor/snubber.

How do I prevent damage from pressure surges?

• Install a snubber/restrictor
• Keep piping short & rigid
• Consider capillary/remote mounting

Which materials suit corrosive media?

316L as standard; for chlorides/chlorine: Hastelloy®/Titanium, for halogens/organic acids: PTFE/PFA-lined, for strong alkalis/acids possibly Tantalum. Always verify compatibility.

What matters in hygienic processes?

Dead-space-free connections (Tri-Clamp/Varivent®), polished surfaces, approved gaskets, CIP/SIP-resistant fill fluids, and easy-to-clean protective caps/covers.

How do I integrate test and calibration ports?

Via test T-pieces, Minimess® couplings, or three-way valves. You can isolate instruments and test in place without venting the plant.

What IP ratings and covers are available?

Protective boots, front seals, and housings up to IP65/IP67. For washdown areas select splash-proof versions and a safety glass window.

How do I plan accessories for differential pressure measurements?

Five-valve manifolds (isolate Hi/Lo, equalize, vent), shut-off on both sides, possibly overpressure protection and diaphragm seals on both sides for aggressive media.

Is Ex-rated accessories available?

Yes—conductive gaskets, grounded valves, and approved barriers/isolators for NAMUR contacts. Observe earthing/equipotential bonding.

What tightening torques apply to threaded connections?

According to manufacturer/standard. Overtightening damages sealing faces; use a torque wrench and suitable sealants (PTFE tape/paste).

Which typical accessory combinations work well?

Does ICS Schneider support selection & installation?

Yes. We advise on valves, gaskets, materials, design of cooling/damping elements, create BOMs, provide calibration certificates, and support IIoT topics (signal/topic design).