How do you troubleshoot a Flow Sensor?
The following are the causes and solutions of sensor failure
1. Sensor damage
If the flow sensor is damaged and cannot detect the water flow normally, a new sensor needs to be replaced.
Replacing the sensor requires professional technicians. It is recommended to contact the after-sales service or the manufacturer’s maintenance engineers for replacement.
2. Waterway blockage
Solve the problem by cleaning the waterway.
Users can remove the water pipe of the water heater and flush the waterway with water. Then install it back.
3. External line failure
Such as short circuit, open circuit or virtual connection. Professionals are required to check and repair the line to ensure normal signal transmission.
4. Sensor failure
Such as hot wire or hot mold damage, pollution or control circuit failure.
Damaged parts need to be replaced and the sensor needs to be kept clean and intact.
5. ECU failure
Power supply problems or circuit grounding failures may be caused by poor heat dissipation, water ingress or component damage.
The circuit board needs to be checked and repaired to ensure its normal operation.
6. Abnormal voltage
Use a multimeter to measure the output voltage of the sensor, which should be 5 volts under normal circumstances.
When air is blown into the sensor, the voltage should change with the flow rate. If the voltage does not change, the sensor may need to be replaced.
7. Mixture adjustment problem
Too lean or too rich a mixture may cause unstable engine idle speed, weak acceleration, increased fuel consumption and abnormal exhaust.
The ratio of the mixed gas needs to be adjusted.
What is a Flow Switch in HVAC?
Heating, Ventilation and Air Conditioning (HVAC) refers to systems or related equipment responsible for heating, ventilation and air conditioning in a room or car. The design of HVAC systems applies thermodynamics, fluid mechanics and fluid machinery. It is an important branch of mechanical engineering. Its purpose is to create an indoor artificial environment that is beneficial to human survival.
HVAC systems can control the temperature and humidity of the air and improve indoor comfort. They are an important part of medium and large industrial buildings or office buildings (such as skyscrapers). In fields and industries such as pharmaceuticals, electronics, mission-critical facilities, and oil and gas, HVAC plays a vital role.
Flow switches play an important role in HVAC. There are many types of flow switches in HVAC. The following is a detailed introduction to HVAC flow switches:
There are four types of flow switches used in HVAC:
Measure the flow rate by the temperature difference between two sensing elements, one is heated and the other measures the ambient temperature. The greater the flow rate, the smaller the temperature difference.
The water flow pushes the reed piece to drive the micro switch. However, the installation requirements are high and it is easily affected by the water flow, and the target piece may break.
Differential pressure flow switch:
The pressure drop generated when water flows through the heat exchanger is used to detect the water flow state. It is easy to install and the flow control is accurate.
Baffle flow switch: The mechanical part is safely isolated from the electronic part. It does not contain bellows that are prone to failure and is suitable for a variety of occasions.
