A trusted and established council service provider​

NZFlow: Verification of Consent Governed Meters

We can assist in helping you meet these standards!


“Verification of flow meters is necessary for consent purposes. It is also an important validation measure and needs to be performed by an experienced impartial Instrumentation Engineer.”

— Steve Beek —
Owner/Director of NZFLOW Ltd

Regional councils want to know how much water is being used from ground and surface water takes.

To be able to monitor these takes, a suitably installed & specified flow meter needs to be incorporated into its design.

In addition to that, a provision has to also be engineered into that design to be able to verify that the flow meter is operating within a tolerance of +/- 5% when compared to a verification flow meter.

ECAN, Canterbury's local governing body, specify that an Ultrasonic clamp-on type flow meter is used. To be able to achieve an accurate verification using this method, 15 straight and uninterrupted pipe diameters of head works is required to be able to test your installed flow meter. This is achieved typically by using the 10:5 approach; 10 upstream of the flow meter and 5 down, noting that the measurement is taken from the center of the flow meter.

The test itself requires the pump to running and up to pressure ideally through your irrigation system but can be achieved by opening a hydrant just a few turns in order to create the desired pressure in the pipeline.​

Calibration Vs Verification Vs Validation​

All these terms are quite often used in the wrong context. At NZFLOW we offer Verification and Validation services. Our portable Flexim Flexus F601 meters are sent away for “calibration” every year.

This process involves our meters being compared to an IANZ accredited flow rig under known and fixed conditions for a specified amount of time. They are then certified to verify installed flow meters where compliance driven testing is required.​

Our validation services are fundamental to your processes running efficiently!

We can offer a data logged flow report of any areas of your process you may be experiencing issues with. You may want to know where all the water goes within your plant and how much.

Does the water into the plant match what’s coming out the other end as waste? Are your boilers running efficiently? All of these questions can be answered and monitored to give you a much better picture of the services within your business. Call or email us today to book an appointment!

Data loggers​

We normally talk dataloggers with our irrigation customers as they are a crucial part of maintaining compliance with your local/regional council. Your flow device must have a pulse output option which can then be wired into a data logger. This will record how much water is being used during operation. There two main types to consider.

Manual Download, stand-alone loggers, Loggers connected to a telemetry network provided and serviced by a third-party organisation 

  • “Radio” Network
  • “Cellular” Network

In irrigation, the use of stand-alone, manual download loggers is on the decline. That aside, this is the most cost-effective way of monitoring your flow usage and complying with regional council. They run off an internal battery and the flow information is stored internally. Access to the stored data is generally via a computer using the comm’s cable provided and the data can be downloaded ready to submit to whichever governing body.

The reason that this type of logger is on the decline is that regional councils are now moving away from processing data in this way. Another reason is that when the battery dies, data is no longer being stored which makes the installation non-compliant. This why the preferred method of recording data is via Telemetry.

A logger connected to telemetry is a far better way to manage your data. Depending on where you are in the country will determine what “network” is best for you and how to delivery your data but even the most remote locations can be monitored this way!

The stored data is sent either by Radio or Cellular network to a host web browser. This browser is owned and monitored by a third party organisation and a yearly fee is charged.

If you have a datalogger specific inquiry, please contact us!

NZ Flow Ltd.