Photo: Man records readings from a hydrant tester using an app


Hydrant Testing Device for Firefighting Water Supply

Pressure and Flow Measurement of Hydrants for Performance Testing according to W 405 and DIN 14462

  • Resource-efficient – no need for hydrant flushing
  • Time-efficient – measurement setup and measurement possible within one minute
  • Verified safety through calibrated measuring system (according to EN 17025 standards)

The comprehensive and cross-system solution for hydrant line testing

The mag-flux® HTL, developed based on DIN 14462:2023-07 and DVGW worksheet W405, enables measurement and recording of pressure, flow, and total volume with cutting-edge software and app – crucial parameters for preventive fire protection to check the efficiency of hydrants. Using, data from the mag-flux® HTL can be transferred and evaluated on a mobile device. Measurement protocols and diagrams can be displayed directly as a preview, and maintenance plans created. The mag-flux® HTL with offers a comprehensive solution from digital documentation, planning, localization, performance testing to maintenance.


Graphic hydrant measuring device and hydrant management software

Advantages of mag-flux® HTL at a glance

  • Measuring system according to DIN 14462:2023-07, EN 671, and DVGW W405
  • Quick and easy determination of necessary parameters
  • Resource-saving as no line flushing is needed
  • Comparability of measurement results with a calibrated system according to EN 17025
  • Extensive analysis possibilities of collected data

Icon flow - check of hydrants

Flow measurement

Icon pressure performance test of hydrants

Pressure measurement

Photo: Man records readings from a hydrant tester using an app

Automatic data transmission via Bluetooth from the hydrant tester to the mobile device using an app

The measuring process can now be controlled via the well-readable display or through the proven software and app of the company All measurement data for pressure, flow, temperature, and turbidity¹ are transmitted live from the hydrant tester to the app. The measurement protocols and diagrams are displayed directly as a preview. The comprehensive solution for hydrant maintenance from digital documentation, planning, localization, performance to maintenance.

¹ Turbidity measurement is carried out using a separate sensor connected to the mag-flux HTL.


Link to the APP for hydrant measurement


Area of application:

Hydrants are fixed water withdrawal points for preventive fire protection. Water suppliers, municipalities, or cities are responsible for ensuring the provision of firefighting and drinking water in the required quantity.



DIN14462:2023-07 deals with the planning, maintenance, and upkeep of hydrants and firefighting water systems. It requires annual determination of water flow, flowing and static pressure, and documentation of the determined performance values.

DVGW Worksheet W 405

The DVGW Worksheet W 405 deals with the provision of firefighting water through the public drinking water supply. This technical standard describes guidelines for firefighting water needs, considering building use and the risk of fire spread.

System setup of a hydrant test with the mag-flux® HTL

The diagram shows the system structure of a hydrant performance test in accordance with DVGW W 405 and DIN 14462
  1. 1.7 m inlet hose

  2. mag-flux® HTL

  3. Control valve

  4. Pressure reducer (flush box)

Workflow of a hydrant performance measurement

1. Scan

Using the Wasserkarte App, the hydrant / measuring point is selected (in this example, using a QR code). Subsequently, the Bluetooth connection to the measuring device is established.

2. Capture

Image of a smartphone running hydrant software

Once the connection is made, a new entry (measurement) is selected.

3. Measure

As soon as the hydrant measurement can begin, it is simply started using the Wasserkarte App (alternatively on the measuring device). The measured values are displayed online on the measuring device and the Wasserkarte App in a graph or table.

4. Synchronize

Once the measurement is completed and synchronization has taken place, the measured values can be viewed online and conveniently processed further.

Video hydrant measurement via app

Images of the hydrant testing device

System setup of a hydrant test with the mag-flux® HTL
mag-flux® HTL Complete Set
Hydrant testing device in operation
Stainless steel pressure destroyer (flush box)

Recalibration for measurement accuracy and safety

For precise, safe, and reproducible measurement, the devices should be recalibrated at the factory at intervals of 24 … 36 months. Key points for determining the calibration interval include:

  • Stress on the measuring and testing equipment
  • Frequency of use
  • Environmental conditions
  • Stability of past calibrations
  • Company-specific requirements of the quality assurance system

These points are to be determined and monitored by the user within the recommended timeframe of 24 ... 36 months.

For measuring instruments used for regular inspection, occupational safety verification, quality assurance of products and services, as well as under extreme environmental conditions, we recommend calibration after 12 months.


Book calibration

Configurations and Accessories of the mag-flux® HTL

mag-flux® HTL

Portable hydrant testing device for measuring pressure and flow, optionally also temperature and turbidity in nominal sizes from DN 50 … DN 150 for flow rates of 0 … 763 m³/h (12,723 l/min).

Product photo: hydrant measuring device mag-flux HTL

Control Valve (HTLAR)

Control valve (slide valve) for precise regulation of the flow in nominal sizes DN 50 … DN 100

Product photo of a regulating valve spool valve

Pressure Destroyer (HTLDV)

The stainless steel pressure destroyer (flush box) allows the safe flushing of hydrants and discharge of the flow rate in nominal sizes DN 50 … DN 100 for flow rates from 217 m³/h … 339 m³/h.

Product photo stainless steel pressure destroyer flush box

Transport Case (HTLTC)

The transport case protects the devices up to DN 150 from dust, water, and damage, making it ideal for storing the high-precision measuring devices and sensors.

Product image Hydrant tester in case

Fire Hoses (ZB-HTL001 … 006)

With the fire hoses incl. Storz coupling (Storz B) according to DIN 14811 in lengths of 0.5 m … 5.0 m, the hydrant test can be flexibly carried out, even with hard-to-reach hydrants.

Product photo of a fire hose

Technical Data

Measurement Accuracy  
Flow ±0.5% of the reading
Pressure ±0.25% FS
Process Conditions    
Pressure range -1 … 16 bar (-14.5 … 232 PSI)  
Process Connections / Nominal Sizes / Flow Rates  
Storz C (nominal width DN 50/2"), rotatable 0 - 84.8 m³/h (0 - 1413 l/min.)
Storz B (nominal width DN 65 / 2½"), rotatable 0 - 143 m³/h (0 - 2390 l/min.)
Storz B (nominal width DN 80/3"), rotatable 0 - 217 m³/h (0 - 3619 l/min.)
Storz A (nominal width DN 100/4"), rotatable 0 - 339 m³/h (0 - 5655 l/min.)
Storz F (nominal width DN 150 / 6"), rotatable 0 - 763 m³/h (0 - 12723 l/min.)
Operating Conditions  
Medium Water
Minimum Conductivity >50 µS/cm
Media Temperature 1 °C … 40 °C (33.8 °F … 104 °F)
Flow Velocity 0.25 … 12 m/s
Certificate of Measurement Accuracy  
Pressure with
Flow with
Structural Design  
Measuring Principle electromagnetiv with pulsed DC field
Measuring Tube PVC
Coil Space PVC
Measuring Tube Lining PVC
Electrode Material Stainless Steel
Housing Aluminium
Weight 14 … 30 kg (30.8 … 66.1 lbs), depending on nominal width (DN 80 = 14.8 kg (32.6 lbs))
Protection Class IP 54
Display 5 inch LCD, illuminated
Operating Duration up to 24 hours

Schedule a Consultation

If you have any questions, please call or write to us!

We look forward to hearing from you and are happy to call you back.

Schedule a Consultation!

Your contact persons:

Madita Widmann

P: +49 (0)2237 60006-48

Frederik Wilden

P: +49 (0)2237 60006-39

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