What is a Chilled Water Flow Meter?

A chilled water flow meter refers to a flow meter that can be used to measure low-temperature water. Common chilled water flow meters include electromagnetic flow meters, turbine flow meters, and ultrasonic flow meters. Used in the condensing system, chiller, or HVAC.

What is a Chilled Water Flow Meter

Chilled Water Flow Meter Types

There is no best water flow meter, only the most suitable water flow meter. Because the application details of each pipeline are different. According to the actual measurement situation, select the most suitable flowmeter. Can save a lot of time and cost.

A magnetic Flow Meter is a flow meter that measures the flow of conductive fluids. Abbreviated as EMF, also called Electromagnetic flowmeters. It is a kind of Volumetric flow meter. A magnetic flow meter measures the velocity of conductive liquids moving through a pipe or conduit. In the wastewater treatment industry, a Magnetic Flow Meter is the best flow meter choice.

Extended reading: 2 inch Water Flow Meter

The vortex flowmeter is a volume flow meter that measures the volume flow of gas, steam, or liquid, the volume flow of standard conditions, or the mass flow of gas, steam, or liquid-based on the Karman vortex principle. When the fluid flows through the dust collector rod of the vortex flowmeter, a vortex is formed. The frequency of vortex shedding is proportional to the fluid velocity. Temperature and pressure compensation can be configured.

Turbine flowmeters are widely used in flow measurement: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas, and cryogenic fluids. Turbine flowmeter signals can be divided into pulse signals or current signals (4-20mA). It is suitable for use with secondary display, PLC, DCS, and other computer control systems.

The ultrasonic flow meter measures the liquid flow rate quickly and effectively. There are two types of ultrasonic flowmeter technology: Doppler frequency shift and transit time.

Transit time ultrasonic flow meter is most suitable for measuring the flow of cleaning liquid. Therefore, it is the most popular type of ultrasonic meter.

Doppler ultrasonic flow meter can measure the frequency difference of sound waves reflected from bubbles or particles in the airflow. It is suitable for aerated or dirty liquids.

Featured Chilled Water Flow Meters

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

What are the limitations of electromagnetic flowmeters at low temperatures?

Electromagnetic flowmeter transmitters are bound by two aspects when measuring cryogenic media.

The transmitter output signal of the electromagnetic flowmeter is small. It is necessary to take care to prevent annoyance.

The temperature and pressure used cannot be too high. The temperature used at that time does not exceed 200°.

For those media above minus 20 degrees, the lining material of electromagnetic flowmeter is usually PTFE.

PTFE is the most stable plastic among chemical materials. However, thermal expansion and contraction are more serious, and the electrode leaks easily.

Extended reading: Ultrasonic Water Meter for Residential Water

If there is no special treatment, when it is used for the measurement of low-temperature medium, the appearance of condensation or condensation on the outer wall of the measuring tube and the transmitter will occur briefly.

The signal will be broken, the insulation resistance between the circuit and the case will decrease, or even a short circuit.

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

Can ultrasonic flowmeter measures chilled water flow?

  1. Ultrasonic flowmeter can measure flow. The temperature does not exceed -40℃~160℃. It is required to have a full tube and a uniform medium. It can display instantaneous flow, flow velocity, accumulated flow, accumulated running time, etc.
  2. Ultrasonic calorimeter can measure heat supply, flow and temperature monitoring. Air conditioning heating and cooling capacity measurement.

When you place an order, you can specify whether it is to measure flow or heat. We will help you choose the model.

Extended reading: Industrial VS Residential inline water flow meters

How to measure the chilled water flow of the chiller?

The following is our experience sharing: Freezer chilled water flow measurement techniques. Hope it can be helpful to you.

1.Water pressure detection of the water inlet and outlet pipes of the freezer

Through the detection of the return water pressure and the outlet water pressure value. Check the water flow rate of the freezer under the pressure difference between the inlet and outlet water in the random manual of the freezer.

By referring to the corresponding table or diagram of the unit’s water flow in the manual. So as to determine whether the freezer system is normal.

And through this difference to determine which section of the water pipeline has a higher resistance value. And make corresponding rectification plans and actions.

Read more: Insertion Type Ultrasonic Flow Meter Applications

2.Detection of the return water temperature and outlet water temperature of the refrigerator (the unit needs to be in normal state)

30 minutes after starting up, check the system or chilled water system inlet and outlet thermometers through the parameters of the unit’s control system.
It can read the inlet water temperature and outlet water temperature when the unit is running. The difference must be about 4-6 degrees.

If the temperature difference between the inlet and outlet water is too large, it means that the water flow of the water system through the plate is too small. This may cause the unit to fail to operate normally or be damaged.

3.Water pump running current detection

By detecting the running current of the refrigerator water pump, it is compared with the rated current. It can be judged whether the actual water flow is larger or smaller than the rated water flow of the pump.

Comprehensive judgment together with the previous parameters. In order to get an exact test and analysis report of the chiller system.

4.Detection of the suction temperature of the compressor copper pipe (only when the refrigeration is running)

If it is 30 minutes after the refrigerating and freezer is turned on

It is detected that the suction temperature of the compressor is lower than 0 degrees. It means that the water flow in the water-side heat exchanger is not enough, which leads to a drop in the evaporation temperature and the evaporation pressure.

And cause Freon is still evaporating and absorbing heat in the suction pipe that flows from the evaporator to the compressor. Will cause the compressor suction temperature to be lower than 0 degrees.

In addition, it is necessary to eliminate the drop in evaporation pressure and evaporation temperature caused by the water temperature set point being too low.

The non-standard low water temperature unit can be considered normal as long as the compressor has a suction superheat of 6-8℃.

So under normal water flow. The suction temperature of the compressor is generally greater than 0°C. Below this value, water system problems need to be ruled out.


Instruments that measure the linear, nonlinear, mass or volumetric flow rate of water are collectively referred to as water flow meters.

Electromagnetic flowmeters, turbine flowmeters, ultrasonic flowmeters, vortex flowmeters, and float flowmeters are all available.

In general, electromagnetic flowmeters are commonly used flowmeters for measuring conductive water, and they are one of the products with high usage rates. Electromagnetic flowmeters can measure sewage, and are more suitable for highly corrosive media.

If it is monitoring domestic water. Then install the water meter.

If it is industrial water, use a flow meter. According to the diameter and flow range of the pipeline, you can select the appropriate flowmeter.

BTU Meters are widely used in the central air-conditioned systems using chilled water systems, for measuring the thermal energy produced or consumed.

BTU is British Thermal Unit (British thermal unit). 1 BTU is the energy required to heat 1 pound of water to 1 degree Fahrenheit, 1 BTU is about 1055 joules.

Putting it together with the hour, it means how many British thermal units of heat can be pumped out by the air conditioner per hour using the heat pump principle.

According to 1BTU=1055.05585 joules, you can calculate how many joules of heat the air conditioner can pump per hour.

Water flow meters measure and indicate the amount of water flowing through pipes. It can simply and intuitively display the water flow situation for the user. Even the instantaneous flow, cumulative flow and other information.

Extended reading: Orifice Plate Flow Meter

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Sino-Inst offers over 50 Chilled Water Flow Meter for flow measurement. About 50% of these are magnetic flow meters, 40% is the turbine flow sensor, and 20% are Ultrasonic and mass flow meter.

A wide variety of flow meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

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