Can I use Welch controllers with non-Welch pumps?

Yes, many controllers are compatible with third-party pumps, but connection specs and control protocols need to be confirmed.

Do Welch gauges require calibration?

Digital gauges typically come pre-calibrated but may need periodic recalibration depending on usage. Analog gauges are less precise and generally do not require recalibration.

What vacuum range do Welch gauges cover?

Ranges vary by model. Some cover from atmospheric pressure down to 10⁻³ mbar. Refer to individual product data sheets for specifics.

Are these gauges suitable for corrosive gases?

Some models are built with corrosion-resistant materials. Always verify chemical compatibility before use.

Gauges and Controllers | Welch Vacuum

REACH OUT TO US

Welch’s vacuum gauges and controllers solve a common problem: inconsistent vacuum levels that compromise process reliability. Whether you're running a lab application, industrial process, or OEM system, precise vacuum measurement is non-negotiable. Welch offers a focused range of digital and analog gauges, plus controllers that automate vacuum regulation—reducing manual oversight and improving repeatability.

The total range of scientifically useful vacuums extends from approx. 1000 mbar (atmospheric pressure) down to 10-12 mbar – the ultra-high vacuum range. A physical measurement of the whole vacuum/pressure range is not necessary. Particular sensors and gauges must be used for parts of the whole range – rough, high and ultra-high vacuum. These systems are also offered in combination as multi-range vacuum gauges for covering multiple measuring ranges.

What You Get

Welch’s product line includes:

Digital Vacuum Gauges: Fast response, high accuracy, and clear readouts. Ideal for lab environments and process monitoring.

Analog Gauges: Rugged and simple. Useful for quick visual checks or backup systems.

Vacuum Controllers: Automate pump operation based on setpoints. Reduce wear, save energy, and stabilize vacuum levels.

Each product is designed to integrate easily with Welch pumps and systems. Most gauges cover a wide pressure range—from atmosphere down to deep vacuum—and use proven sensor technologies like Pirani, capacitive, and thermocouple.

Why It Matters

Vacuum performance isn’t just about the pump. Without accurate measurement and control, you risk over-pumping, underperformance, or process failure. Welch gauges and controllers give you the data and automation needed to maintain optimal conditions—especially in applications like:

Filtration and aspiration

Freeze drying

Vacuum ovens

Distillation

Glove boxes

OEM systems

Compatibility & Integration

Welch gauges and controllers are compatible with most Welch vacuum pumps, including diaphragm, rotary vane, and hybrid models. Many units feature standard fittings and digital interfaces for easy integration into existing setups.

Vacuum Gauges

Next to vacuum meters with mechanical sensors, membrane pressure gauges with electronic membrane sensors have become established.

Vacuum Controllers

Welch offers programmable vacuum controllers for process control in the rough vacuum range 1100 to 1 mbar. Controlled pressures.

FAQs

A Pirani gauge and a capacitive gauge are both used to measure vacuum pressure, but they operate on very different principles and are suited to different pressure ranges and applications.Pirani gauges measure thermal conductivity and are best for mid-to-low vacuum ranges. Capacitive gauges measure pressure by detecting the deflection of a diaphragm due to gas pressure. These gauges are gas agnostic, and offer higher accuracy and stability, especially in low-pressure applications.

Gauges & Controllers