HN500B three parameter combination probe

HN500B three parameter combination probe

1、 Product Overview

The KH-7700 three parameter combination probe is an advanced and compact multifunctional integrated monitoring sensor, mainly used for monitoring the safe operation of cooling tower fans, gearboxes, and other rotating machinery. This probe innovatively integrates the sensing unit, signal conversion, and transmission circuit of three key safety parameters: oil temperature, oil level, and vibration. It can synchronously measure and directly output 4-20mA standard current signals corresponding to these parameters. Its output signal can be conveniently connected to various general-purpose secondary instruments, digital displays, or computer data acquisition and monitoring systems (such as DCS, PLC, etc.) to achieve online real-time monitoring and early warning of equipment status, making it an ideal unit for modern industrial equipment safety monitoring.

2、 Core functions and measurement principles

1. Temperature measurement:

·Principle: High precision platinum resistance sensor (PT100) combined with semiconductor integrated devices is used for measurement.

·Range: usually 0-100 ℃, covering the normal operating temperature range of lubricating oil.

·Accuracy: The overall error is usually ± 1 ℃ (other data shows ± 3 ℃, depending on the model and configuration).

2. Oil level measurement:

·Principle: According to different designs, there are mainly two technical paths:

·Thermal conductivity sensing principle: Determine liquid level height by detecting changes in thermal conductivity.

·Principle of capacitive sensing: Sensing liquid level height by detecting changes in capacitance. It should be noted that the capacitive principle requires the tested lubricating oil to be a non-conductive medium.

·Scope: Commonly ranging from -10mm to+40mm (-10mm usually corresponds to the lower limit position of the normal oil level of the gearbox).

·Accuracy: The maximum error is generally ≤± 5mm.

3. Vibration measurement:

·Principle: There are also two mainstream technical solutions:

·Magnetic electric sensor: directly obtains the velocity signal of mechanical vibration, processes it through amplifier, bandpass filter, and true RMS converter, and outputs a signal proportional to the effective value of vibration velocity.

·Acceleration sensor: directly obtains acceleration signals, which are processed by amplifiers, bandpass filters, first-order integration, and true RMS converters, and finally output signals proportional to the effective value of vibration velocity.

·Range: 0-20 mm/s (true effective value of vibration velocity).

·Frequency band: The effective monitoring frequency band range is usually 10-1000Hz.

·Accuracy: The maximum error is generally ≤± 1 mm/s.

HN500B three parameter combination probe

3、 Main technical parameters

Detailed description of parameter categories with remarks

Signal output DC/4-20mA standard current signal (three parameter independent output) Active or passive output depends on the specific model

Working voltage DC/24V (common range DC/24V ± 4V or ± 2V) with reverse polarity protection

The maximum load capacity is usually<300 Ω or<500 Ω (depending on the model and supply voltage)

Environmental adaptability: Temperature range of -20 ℃ to 80 ℃; Ports are usually sealed with 704 silicone rubber, which has good moisture resistance, corrosion resistance, earthquake resistance, and explosion resistance

The installation method is usually in the form of external threads (such as M27 × 2) installed in the threaded holes of the equipment. The thread specifications for inserting the probe into the measured medium need to be specified when ordering

4、 Product Features

·Highly integrated: One probe simultaneously monitors three key parameters, simplifying system structure, reducing installation points and wiring complexity, saving space and cost.

·Stable and reliable: The all stainless steel shell, good sealing (such as 704 silicone seal), and seismic and explosion-proof design enable it to adapt to harsh industrial environments (such as high temperature, high humidity, and strong vibration).

·Strong anti-interference ability: outputting 4-20mA standard signal, with anti-interference ability for long-distance transmission, suitable for long-distance transmission to the control room.

·Easy installation: With an integrated structural design, it is easy to install and usually does not require complex on-site debugging.

·Intelligent compatibility: The output signal can be directly connected to various control systems such as DCS, PLC, or digital displays, making it easy to integrate into existing automation monitoring networks.

5、 Application Fields

The KH-7700 three parameter combination probe is not only suitable for safety monitoring of cooling tower fans and gearboxes, but also widely used for status monitoring and protection of various rotating machinery in the following fields:

·Power industry (water pumps, fans, gearboxes)

·Water conservancy engineering

·Building materials industry

·Rail Transit

·Chemical industry

·Any other occasion that requires continuous online monitoring of equipment vibration, temperature, and liquid level.

6、 Precautions for use

·Medium compatibility: If the capacitive oil level measurement principle is used, it must be ensured that the tested lubricating oil is a non-conductive medium.

·Correct installation: It is necessary to install according to the requirements to ensure that the probe is firmly installed and the length of the probe rod meets the measurement requirements.

·Electrical connection: Please pay attention to the polarity of the power supply when wiring. Although most products have built-in reverse protection, it is still necessary to avoid misoperation as much as possible.

·System matching: When selecting, it is necessary to consider the signal matching issue with the backend secondary instrument or control system.

Summary: The KH-7700 three parameter combination probe provides users with an efficient and economical equipment safety monitoring solution due to its integration, high reliability, strong anti-interference ability, and wide applicability. It helps to achieve predictive maintenance, avoid unexpected shutdowns, and ensure production safety.