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testo 324 - Pressure/gas leak detector

0632 3240
  • Easy to set up, easy to use due to legally compliant measuring menus (i.e. according to TRGI 2018)
  • Extremely accurate and DVGW-compliant measuring results
  • Leak tightness checks of gas pipes according to TRGI 2018 and liquid gas pipes according to TRF 2021
  • Easy to use due to automatic pressure build-up; quick and easy data storage
  • Professional pressure/leak detector for installation, maintenance and service of gas and water pipes. Specially designed to carry out reliable leak tightness checks, load tests, serviceability tests, temperature measurements in accordance with existing rules and regulations.
    The DVGW-tested  testo 324 is a professional all-rounder designed to help you carry out your installation and maintenance work quickly and easily. The easy-to-set-up, easy-to-use gas leak detector is specially designed to allow you to perform all legally required tests and inspections – i.e. leak tightness checks, load tests and serviceability tests – on gas and water pipes.

    The testo 324 pressure/leak detector can be used for the following applications

    • Leak tightness checks on gas pipes (leak tightness check and load test according to TRGI 2018 and DVGW G 5952)
    • Serviceability checks according to TRGI 2018  on gas pipes
    • Pressure tests on water pipes (drinking water according to ZVSHK EN 806-4, waste water according to DIN EN 1610)
    • Leak tightness checks on liquid gas pipes according to TRF 2021
    • Gas pressure regulator inspections
    • Pipe volume measurements
    • Further applications including temperature measurements at radiators and pressure measurements at burners (die pressure, gas flow pressure…)

    State-of-the art technology, easy to use

    Despite being packed with sophisticated technology, the testo 324 is still especially easy to use. A variety of useful features and tools like a single hose connecting point, a high-resolution graphic display, preloaded programs including “Gas pipe TRGI 2018 ” and automatic pressure build up ensure that you are able to carry out your installation and maintenance work quickly and easily.
    There is also a wide selection of optional accessories – ranging from a turbo printer for print outs on site to a tool carry case with gas bubble for preventing the formation of dangerous gas-air mixtures – which are all designed to make work more efficient and life easier.


    testo 324 pressure/leak detector, rechargeable battery, calibration certificate.

    Temperature - NTC

    Measuring range
    -20 to +100 °C

    Temperature - TC Type K (NiCr-Ni)

    Measuring range
    -40 to +600 °C
    ±0.5 °C or ±0.5 %

    Absolute Pressure

    Measuring range
    600 to 1150 hPa
    ±3 hPa
    to 1200 hPa

    Additional accessories



    Plugs, caps, hoses etc.

    Printer and accessories

  • Printer and accessories
    testo printer
    BLUETOOTH®/IRDA printer for printing out measurement data and graphics
      0554 0620
    • Printer and accessories
      Spare thermal paper
      Spare thermal paper for printer, permanent
        0554 0568
      • Printer and accessories
        testo-Schnelldrucker IRDA mit kabelloser Infrarot-Schnittstelle
        testo fast printer IRDA
          0554 0549

        • Leakage test on gas pipes (leak and load test)

          The technical regulation for gas installations (in short: TRGI) is a binding and at the same time important regulation for skilled trade. The TRGI governs how gas installations are to be planned, designed, serviced and maintained. This applies to all gas installations. This regulation is taken care of by the German Association for Gas and Water (DVGW). The TRGI 2018 is the current version. Amongst other things, this states that gas pipes are to be tested according to the construction phase (basic shell, completion, and repairs). The following inspections particularly play a role in the application stated here:

          Load testing
          During testing, the material is tested for stability and the connections for service life; this takes place prior to plastering over or concealment of the gas pipes. During load testing, the newly installed pipe, without fittings or gas appliances, is put under 1 bar pressure. The testing medium is air or inert gas. There must not be a drop in pressure during the test, which lasts at least 10 minutes.

          Leak test
          This test is for checking the pipe for leaks, without fittings and gas appliances. The measuring instrument must not register a drop in pressure during the minimum 10 minute testing period (depending on the system volume); the test pressure is 150 mbar (previously 110 mbar).
          testo 324

          Leakage test on gas pipes in the boiler room

          A gas installation set up according to the legal provisions of the German Association for Gas and Water (“DVGW”) and the TRGI 2018 is the prerequisite for proper, long-term operation. However, while in operation, operating conditions or other general conditions may affect the safety of the gas installation. Technical systems are subjected to wear and contamination in their daily use. Only an expert can identify, assess and repair these kinds of safety-related changes. The leak test (or more aptly, serviceability test, also known as leakage measurement) for the pipeline system is to be repeated every 12 years using a measuring instrument and recorded in a test results report. The operator thus has a technical expert report. Some buildings insurers include these inspections and certificates/reports in their general insurance terms. For the serviceability test or leakage measurement, the gas pipe is always tested in operating conditions/with operating pressure (no increased test pressure). During this test, a measuring instrument detects whether gas is leaking from the pipe and how much.

          Measuring pressure on burners (nozzle pressure, gas flow pressure, etc.)

          Standard readings taken during services of domestic heating systems include checking the gas pressure on the burners. This involves measuring the gas flow pressure and gas resting pressure. The flow pressure, also called supplied pressure, refers to the gas pressure of the flowing gas and resting pressure of the static gas. If the flow pressure for gas boilers is slightly outside the 18 to 25 mbar range, adjustments must not be made and the boiler must not be put into operation. If put into operation nonetheless, the burner will not be able to function properly, and explosions will occur when setting the flame and ultimately malfunctions; the burner will therefore fail and the heating system will shut down.

          Measuring temperatures on radiators

          When measuring temperatures on radiators, the flow and return temperature are recorded in particular and assessed by the tradesman. The flow temperature is defined as the temperature of the thermal transfer medium (e.g. water) that the system is supplied with. The temperature of the medium flowing out of the system is accordingly called the return temperature. To prevent losses within the heat distribution system and achieve a better level of efficiency spot recording of flow and return temperatures are necessary. Implementation of relevant measures ultimately leads to hydraulic adjustment on the basis of knowledge about the flow and return temperatures. This defines a procedure with which every radiator or heating circuit of a flat radiator within a heating system is supplied at a set flow temperature with the precise amount of heat needed to achieve the ambient temperature required for the individual rooms. Flawed operating conditions will result in considerable excess consumption of electricity and heating energy. The German Energy Saving Regulation (EnEV) therefore requires hydraulic adjustment for systems being set up or overhauled for this very reason.

          Pressure tests on water pipes (drinking and waste water)

          According to the legal regulations of DIN EN 806-4, DIN 1988-7 and DIN 1610, drinking and waste water pipes are to be tested for leaks before being put into service by means of a pressure test with air, inert gas, or water; they are also to undergo load testing with air or inert gas. However, for reasons of hygiene, it is best if the pipes remain dry until shortly before commissioning and do not undergo a leak test using water. A pressure test with air is also recommended to prevent metallic materials from corroding. The pressure test is split into two pressure-related parts where test pressure and time depend on the target (load or leak-proof). Leaks can usually be heard very quickly. If it is difficult to locate the leaks, the usual auxiliary tools and materials for gas pipes are used (spraying or painting on foaming solutions).

          testo 324