Piston stroke sensors are essential components in the hydraulic system of concrete pumps. They ensure the piston operates accurately, helping the pump system function smoothly and durably. Since the value of these sensors is not cheap, choosing the right product will help customers avoid the risk of purchasing low-quality items that can disrupt construction work.

Therefore, customers need to pay attention to important characteristics and features to avoid selecting a product that is overpriced but of inadequate quality. The following article will help you address the following issues:

– How many types of sensors are there and what are the commonly used types today?

– What issues should be considered when purchasing piston stroke sensors?

– And where can you buy quality and genuine sensors?

1. Classification of Sensors by Technical Characteristics

Piston stroke sensors are installed on hydraulic cylinders that push and pull concrete, reading the piston stroke and sending signals back to the processor to move the piston. This allows us to control them accurately, easily, and automatically.

Hydraulic cylinder for pushing and pulling concrete

Currently, piston stroke sensors are divided into two main types:

• PNP Sensors (Normally-Closed – open by default): Used for concrete pumps in general and specific types of machinery due to their high operational frequency, requiring high accuracy, and functioning in harsh environments. The piston stroke sensor mounted on Hyundai Everdigm concrete pumps is also classified as a PNP sensor.
• NPN Sensors (Normally-Open – closed by default): Used for lighter tasks such as components in closed production processes in factories….

2. Important Considerations When Choosing a Sensor

Each type of sensor has its own characteristics and only operates effectively when used with the appropriate equipment. Below are the issues you need to consider when selecting a piston stroke sensor:

First: Sensor Code

First, when choosing, we need to pay attention to the sensor code to avoid mistakenly purchasing an incompatible product that does not synchronize with our equipment. The sensor code is usually embossed or engraved directly on the body of the sensor and behind the brand name (commonly referred to as the sensor label).

Currently, there are 2 common types of sensors that are widely used and easily found in the market: Standard sensors and Balluff sensors.

+ Standard sensors: Must self-adjust the distance between the piston tip and the sensor tail. If not adjusted during installation, the piston impact and oil flow in the cylinder will conflict and collide with the sensor tail, causing damage if over-adjusted, or the sensor will fail to receive signals if under-adjusted.

+ Balluff Sensors – Germany, includes 2 codes:

*BHS00032: Commonly used on Everdigm and original Putzmeister vehicles. This code is 100% produced and imported from Germany.

*BHS00064: Used on other Korean and Chinese vehicles with equivalent designs. This code is only produced and imported from China, Taiwan, India….

However, all types of sensors can be used and interchanged with each other if their dimensions, designs, and thread pitches are similar.

Second: Manufacturing Brand

In addition to the sensor code, we should also pay attention to the manufacturing brand. Currently, the most popular brand is Balluff (Germany), which is applied to all concrete pump equipment branded Hyundai Everdigm and original Putzmeister from Germany.

For the piston stroke sensor of Putzmeister, its length will be longer than the sensor mounted on Everdigm at the sensor wire connector position. However, Putz and Everdigm sensors can be interchanged because they are synchronized in frequency and current (voltage of the sensor).

Third: Product Specifications

To determine the specifications of your sensor, you can visit the website Balluff.com. This brand has over 100 years of experience in researching and manufacturing sensors and related components.

For the sensor code BHS00064 with a current intensity of 10dcc and a frequency of 200MHz, while the BHS00034 series currently used on Everdigm pumps has a current of 10-30dcc and a frequency of up to 2000MHz.

When installed incorrectly with the equipment being used, it can cause intermittent phenomena or hydraulic flow that does not meet standards, leading to easy damage.

When checking specifications, we should pay attention to the product code, voltage (MHz), and frequency: These are three important parameters that determine compatibility and stable working performance for the pump.

Although compact, inside the sensor when disassembled, we will see a delicate electronic circuit board sealed with high-quality plastic, fire-resistant, and preventing water ingress that could disrupt the control and power supply of the sensor.

Illustration of the BHS0032 stroke sensor

Illustration of the cross-section of the BHS00032 sensor – Balluff

Image of the BHS00032 sensor (right – shorter) and BHS00064 (left)

Technical Specification Comparison Table

3. VIPEC – The Supplier of Genuine Piston Stroke Sensors

VIPEC Joint Stock Company specializes in importing and distributing genuine concrete pump spare parts in Vietnam. We are committed to:

Providing genuine Balluff sensors (codes BHS0032, BHS0064) along with many other hydraulic spare parts.

Ensuring clear origin and complete warranty.

Consulting on the correct type of sensor and product code for each concrete pump model.

📍 Contact VIPEC for consultation & pricing on genuine piston stroke sensors:

Hotline: 1900 636 341

Email: [email protected]

Address: 509, QL51, KP2, Long Hung Ward, Bien Hoa, Dong Nai

With experience and reputation in the field of specialized equipment & spare parts, VIPEC is a reliable partner for customers to confidently choose high-quality piston stroke sensors for concrete pumps at a worthy value.