Teltherm – Flowmeter NZ

Choosing the Right Flow Meter: A Guide to Accurate Measurement in NZ Industries

When it comes to measuring flow — whether it’s gas, steam, or liquid — accuracy is everything. The wrong flow meter can lead to process inefficiencies, safety risks, or costly downtime. That’s why selecting the right device for your application isn’t just a technical decision — it’s a strategic one.

At Teltherm, we help NZ industries make confident choices backed by expertise, precision, and reliability.

What Type of Flow Are You Measuring?

Understanding what you need to measure is step one. Is it:

– Volumetric flow: the total amount of fluid moving through
– Standard or normal flow: volumetric flow corrected to standard conditions
– Mass flow: the actual mass of the fluid, accounting for density

Different media require different strategies:

– Liquids: Volumetric flow meters often suffice. Under stable pressure and temperature, inferred mass flow is acceptable.
– Gases and steam: These need corrections for pressure and temperature changes, so measuring mass or standard volume flow is critical.

Flow Meter Technologies – Pros & Applications

Here’s a quick breakdown of key flow meter types and when to use them:

1. Magnetic Flow Meters (Mag Meters)
– Ideal for conductive liquids
– No moving parts, minimal pressure loss
– Excellent for water, slurries, and chemicals

2. Mass Flow Meters (Coriolis & Thermal)
– Coriolis meters measure mass directly with high accuracy
– Also capture density and volumetric flow
– Thermal mass meters are economical for gas flow and require no pressure/temperature compensation

3. Mechanical Flow Meters
– Include turbines, rotors, and gears
– Great for clean fluids and gases
– Provide high accuracy with simple operation

4. Vortex Flow Meters
– Create oscillations (vortices) behind a shedder bar
– Best for gas, steam, and low-viscosity liquids
– Multivariable options include built-in temp/pressure sensors for mass flow calculation

5. Ultrasonic Flow Meters
– Use transit time or Doppler effect
– Clamp-on or inline installations
– Perfect for non-intrusive or portable measurement of liquids

6. Open Channel Flow Meters
– Measure in streams, sewers, and partially filled pipes
– Use ultrasonic, microwave, or laser tech to assess flow velocity and level without modifying the channel

7. Differential Pressure Flow Elements
– Based on Bernoulli’s principle (flow restriction = pressure loss)
– Includes:
– Orifice plates
– Venturi tubes
– Pitot tubes
– Laminar flow elements
– Reliable for liquids, gases, and steam

Teltherm: Your Flow Measurement Experts

Whether you’re upgrading your plant or specifying for a new project, Teltherm has the experience and range to guide your decision.

We don’t just supply flowmeters in NZ — we help you match the right technology to your process, medium, and performance requirements.

📞 +64 9 633 0040
📧 sales@teltherm.co.nz
🌐 teltherm.co.nz

*Keywords used: Flowmeter nz, Pressure Measurement nz, Gas Detectors nz, Analytical Instrumentation nz, Level Measurement nz*