testo 512-2

A Large Range for Higher Pressures

The testo 512-2 measures differential pressure up to 2,000 hPa, ten times the range of the testo 512-1. That suits work where pressures run higher than in building ventilation, such as checking gas flow pressure and static gas pressure on burners, and situations where the pressure range isn’t known in advance.

Across that range, accuracy is ±0.5% of the measuring range, with 1 hPa resolution, and the sensor withstands an overload of up to ±2,500 hPa.

Why Position Independent Matters

This is the specification that separates a good differential pressure meter from an ordinary one, and it’s rarely explained.

Many differential pressure sensors are affected by the way the instrument is held. A reading taken with the instrument flat can differ slightly from one taken upright, so a technician either zeroes it in the exact position they’ll measure in, or accepts an error they can’t quantify.

The testo 512-2 uses a position independent sensor, so the reading stays reliable however the instrument is held.

testo 512-2 or testo 512-1?

The two instruments look the same, but they’re built for different jobs.

Most building HVAC work sits well inside 200 hPa. For filter checks, room pressure and Pitot tube duct traverses, the testo 512-1 gives much finer resolution and calculates velocity and volume flow. The testo 512-2 is the choice where pressures are higher.

Our Technical Consultants can help you choose, based on the pressures you’ll actually be measuring.

The Phone as a Second Screen

The free testo Smart App connects over Bluetooth 5.0. It configures the instrument, displays the measurement as a graph, and saves the data. It also manages customers and measuring points, and creates reports on site, including photos, as PDF or CSV files that can be emailed straight away.

On a commissioning or service job, a measurement curve shown to the client on a phone is more persuasive than a number read out from an instrument, particularly when the point being made is that something isn’t performing.

Alarms and Durability

An audible alarm sounds when a limit value is exceeded, so a reading outside the expected range is flagged immediately. The compact, robust housing weighs 191 g, and 3 AA batteries give about 120 hours of operation.

Accessories and Calibration

The testo 512-2 comes with a transport bag, silicone connection hose, calibration protocol and batteries. A Bluetooth printer is available for on site printouts.

An ISO pressure calibration certificate, covering five points across the range, and a DAkkS certificate, covering 11 points, are available. That matters where the measurement supports a commissioning certificate or a compliance position.

Where It’s Used

Gas flow pressure and static gas pressure checks on burners. Higher pressure differential measurements on plant. Industrial ventilation and process applications where pressures exceed 200 hPa. Situations where the pressure range isn’t known in advance.