- PN in bar PN 400
- Material: CrNi-Stahl
- Connection: G1/2, G1/2 B
- Temperature: Medium: -40°C bis 300°C
 Datasheet |
Cooling Elements for Pressure Gauges – Thermal Decoupling for Longer Service Life
Cooling elements for pressure gauges lower the temperature at the instrument and protect pressure gauges, digital gauges, pressure switches or diaphragm seals when measuring hot media. Depending on the design (e.g. fin coolers, heat sinks, cooling sections, remote/capillary spacers), the thermal load on the device is significantly reduced—without rebuilding the measuring point.
Available with common connections G 1/4, G 1/2, 1/4" NPT, 1/2" NPT (optionally M20×1.5) and in carbon steel or stainless steel 304/316(L). ICS Schneider Messtechnik can supply pre-assembled sets with shut-off valve, snubber, siphon and instrument, as well as EN 10204 3.1 material certificates.
FAQ on Cooling Elements for Gauges
Selection, installation, materials, temperature limits, and combining with siphons, valves, and diaphragm seals—explained briefly.
What do I need a cooling element for?
For thermal decoupling of the instrument from hot media (e.g. steam, thermal oil). This lowers the device temperature, reduces drift effects, and extends service life.
Which designs exist?
| Type | Feature | Typical use |
|---|---|---|
| Fin cooler / heat sink | Large surface, compact | General hot media, limited space |
| Cooling section (plain tube) | Longer distance | Higher start-up temperatures |
| Capillary/remote spacer | Flexible mounting position | Ergonomic viewing, distance from heat source |
| Combo: siphon + cooler | Thermal + pulsation damping | Steam service with pressure spikes |
When should I use a siphon vs. a cooling element?
Siphons (gauge pigtails) work via condensate, especially in steam; cooling elements are medium-independent and dissipate heat by convection. In many cases the combination is ideal.
What threads/standards are common?
| Thread | Standard | Sealing |
|---|---|---|
| G 1/4, G 1/2 | ISO 228 (BSPP) | Flat gasket/O-ring at the sealing face |
| 1/4" NPT, 1/2" NPT | ASME B1.20.1 | PTFE tape or paste |
| M20×1.5 (optional) | ISO metric | Use the matching sealing concept |
Which material suits my medium?
Carbon steel for neutral media/standard duty; 316(L) for corrosive media/environments or higher temperature resistance. Select gasket materials (PTFE, FKM, EPDM, FFKM) to suit medium and temperature.
How much cooling effect can I expect?
It depends on surface area, length, flow, and ambient conditions. Fin coolers typically reduce instrument temperature by several tens of kelvin. For exact sizing, provide process data (T, p, medium).
Does a cooling element affect response time?
Only slightly. Longer, narrow cooling sections can increase response time a bit. For fast processes keep length/bore moderate and use a snubber deliberately.
How do I install a cooling element?
- Clean threads; use the correct sealing concept (BSPP/NPT).
- Mount without mechanical stress; avoid lever forces on the housing.
- Do not cover fins/body—ensure free convection.
Can I combine cooling elements?
Yes. Typical stack: Process → shut-off valve/gauge cock → siphon or snubber → cooling element → gauge/diaphragm seal.
How do I choose the right size?
Based on process temperature, permissible instrument temperature, available space, and thread standard. For very high temperatures, use a longer cooling section or combine with a siphon.
What pressure/temperature limits apply?
They depend on wall thickness, geometry and material. For hot steam, stainless steel versions are preferred. Observe applicable codes (PED/ASME).
Anything special for hazardous (Ex) areas?
Mechanical parts are usually uncritical. With electrical components (e.g. contact gauges) observe Ex approvals and ensure bonding/isolation barriers.
Are hygienic applications possible?
Yes—with 316L, suitable gaskets and low-dead-space installation; optionally use hygienic process connections and a diaphragm seal.
Maintenance & cleaning?
Regularly check for contamination (dusty fins) and clean to maintain cooling performance; check threaded joints for tightness.
Do you supply sets & documentation?
Yes—ready-to-install sets incl. valve/siphon/snubber and instrument, and upon request EN 10204 3.1 and test documentation.
Common mistakes to avoid
- Covering fins → reduced cooling.
- Wrong sealing system (BSPP/NPT) → leakage.
- Too short a distance for very hot media → instrument overheating.