# Pressure gauge

> Dial pressure gauges to ASME B40.100 with 316 stainless steel wetted parts, dry or liquid-filled, and what a request needs: range, dial size and connection.

URL: https://jjprojectsok.com/products/electrical-instrumentation/pressure-gauge  
Español: https://jjprojectsok.com/es/products/electrical-instrumentation/pressure-gauge  
Updated: 2026-10-16

Dial instrument that shows process pressure locally at the line or equipment.

**In short:** Dial instrument that shows process pressure locally at the line or equipment. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASME B40.100.

## Specification references

- Standards: ASME B40.100
- Wetted parts: 316 stainless steel or as the fluid requires
- Data to give: Range, dial size, connection and fill (dry or liquid-filled)

> Typical references only. The governing specification is the one on your purchase order or datasheet.

## Typical uses

- Local pressure indication on process lines, vessels and pumps
- Utility lines for steam, air, water and fuel
- Instrument air and hydraulic systems
- Test points and skid-mounted packages

## What to include in a request

A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.

1. Pressure range and units, for example 0 to 100 psi or 0 to 7 bar
2. Dial size, for example 63, 100 or 150 mm, or 2.5 or 4 in
3. Process connection: size, thread and position, such as 1/2 in NPT lower or back mount
4. Wetted parts and case material, for example 316 stainless steel, and the fluid
5. Fill: dry, or liquid-filled such as glycerin or silicone, for vibration or pulsation
6. Accuracy grade under ASME B40.100, and the case safety features, such as a blowout back
7. Special cleaning, for example oxygen service, diaphragm seal for corrosive or viscous fluids, and quantity

[Request this item](https://jjprojectsok.com/request-a-quote?item=pressure-gauge)

## Questions

### How do I choose the gauge range?

A common practice is to pick a range so the normal operating pressure falls in the middle part of the scale and the maximum stays within the limit the manufacturer states for steady pressure. A range far above operating pressure reads poorly.

### When should a gauge be liquid-filled?

When there is vibration or pressure pulsation, since the fill damps the pointer and reduces wear. The fill must be compatible with the fluid and the temperature. Oxygen service needs a special oil-free cleaned gauge instead.

### What is a diaphragm seal for?

A diaphragm seal separates the gauge from fluids that are corrosive, viscous, hot or prone to clogging, passing the pressure through a fill fluid. State the process fluid so the right arrangement is quoted.

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## Guides

- [How to write an RFQ for industrial materials](https://jjprojectsok.com/knowledge/how-to-write-an-rfq): What an RFQ for industrial materials must specify: item, size, schedule or class, grade, standard, quantity, MTRs, inspection, packing and Incoterm.

[All electrical and instrumentation](https://jjprojectsok.com/products/electrical-instrumentation)