Блок акустической диагностики SITRANS DA400

Acoustic diagnostics unit SITRANS DA400 and sensor

The SITRANS DA400 acoustic diagnostics unit acoustically measures the structure-borne sound of oscillating displace­ment pumps.

It consists of an electric diagnostic unit and up to four acoustic sensors.

Особенности

• Increase in the availability of the system by:
• Planning maintenance in advance by early recognition of defective components
• Reducing downtimes (no fault searching necessary)
• Increasing maintenance intervals
• Increasing the reliability of the pumps
• Avoiding expensive consequential damage
• Increased safety of critical applications
• Early recognition of a reduction in power
• Increased productivity

Область применения

The SITRANS DA400 allows continuous, simultaneous and inde­pendent monitoring of up to four delivery valves in a pump for leaks. In addition, another four inputs are available for monito­ring standard signals (e.g. diaphragm and temperature monito­ring). This means that the condition of an oscillating displace­ment pump is monitored in every phase of its operation.

The SITRANS DA400 is used in all industries where oscillating displacement pumps are used.

If the acoustic diagnostic unit is used in zones where there is a risk of explosion, sensors can be operated in an Ex zone if safety barriers are used.

Функции

Product features

Continuous and independent status monitoring:

• of the delivery valves, for leaks
• of the membranes, for material fatigue
• of the temperature loading of the hydraulic oil

Communication of the status to superordinate process control systems:

• via digital outputs
• digitally, via PROFIBUS DP or PROFIBUS PA

Simple to operate and parametrize:

• Locally, via digital display and keys
• PROFIBUS DP and PROFIBUS PA

Mode of operation

Measuring principle

Leaks in the delivery valves of oscillating displacement pumps are flows in which cavitation occurs. This results in sound waves that are transmitted to the valve housing, where they are recor­ded by the structure-borne sound sensor in the SITRANS DA400 on the outside.

The SITRANS DA400 utilizes the fact that with both an open valve and a closed intact valve, no cavitation occurs and the measured sound level thus corresponds to the operating noise of the pump. By contrast, with a closed defective valve cavitation does occur, which can be identified by a period increase in the sound level (see figures). The measured value from the SITRANS DA400 corresponds exactly to this increase in the sound level.

The measurement is carried out exclusively in the ultrasonic range. This filters out the operating noise of the pump and the closing noise of the valves.

Signal from structure-borne sound sensor with intact valve

Signal from structure-borne sound sensor with defective valve

Sensor operation

The structure-borne sound sensor works on the piezoelectric principle. The structure-borne sound is injected into the sensor via the sensor base (mounting surface) and inside it is converted into an electrical voltage by a piezo-ceramic element. This is am­plified in the sensor and transmitted via the cable.

The sensor frequency range lies in the ultrasonic range (>20 kHz). The sensor is non-directional, i.e. the angle at which the sound wave is incident on the sensor base is not important.

Mode of operation of the electronics

SITRANS DA400, function diagram of the electronics

Технические данные

Чертеж

Sensor for SITRANS DA400, dimensions in mm (inch)

SITRANS DA400, dimensions in mm (inch)

Схема подключения

SITRANS DA400, terminal assignment

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