Блок акустической диагностики SITRANS DA400 - Сигнализаторы сбоев в промышленном процессе

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

SITRANS DA400
Input
Acoustic channels
Cycle time	10 ms
Universal input
Cycle time	80 ms
Low pass filter time	1 s
Universal analog current input
Load	< 105 Ω
Resolution	0.1%
Accuracy	0,5%
Fault signal	> 21 mA or < 3,6 mA (at 4 ... 20 mA)
Alarm monitoring hysteresis	0.5%
Static destruction limit	40 mA, 4 V
Universal 24 V-digital signal input
Input resistance	> 19 kΩ
Signal level low	< 4.5 V or open
Signal level high	> 7 V
Hysteresis	> 1 V
Static destruction limit	± 40 V
8,2 V source for NAMUR signal (DIN EN 60947-5-6)
Open circuit voltage	8.2 V ± 0.3 V, short circuit-proof
Internal resistance	< 950 Ω
Static destruction limit for incorrect wiring	+20 V/-10 V
Output
Digital output
Semiconductor relay	Individually isolated, short circuit-proof
Switching voltage	24 V AC/36 V DC, any polarity
Destruction limit	35 V AC/50 V DC
Max. switching current	100 mA
Rated conditions
Installation conditions	Vertical wall mounting, cables fed in from below
Climatic category	Class 4K4 to EN 60721-3-4
Ambient temperature	-20 °C ... +60 °C (-4 °F ... +140 °F)
Mechanical load	Class 4M3 to EN 60721-3-4
Degree of protection to EN 60529	IP65
Electromagnetic compatibility
Interfrence immunity and emitted interference	To EN 61326 and NAMUR NE 21
Usage limits for water
Intake side	1 bar a
Delivery side	≥ 10 bar a
Number of strokes	< 300 1/min
Design
Weight (without options)	Approx. 2.5 kg
Dimensions (W x H x D) in mm (inch)	172 x 320 x 80 (6.8 x 12.6 x 3.2)
Housing material	Macrolon (polycarbonate + 20% glassfiber)
Electrical connections via terminal screws	Rigid 2.5 mm (0.984 inch) Flexible 1.5 mm (0.590 inch) Flexible with connector sleeves 1.5 mm (0.590 inch)
Cable inlet via plastic cable glands	2 x Pg 13.5 5 x Pg 11
Power supply
Rated voltage	24 V DC
Operating range	19 V to max. 36 V DC
Current consumption	< 100 mA
Certificates and approvals
Explosion protection to ATEX	In preparation
Communication
PROFIBUS DP	RS485, switchable terminating resistor
Protocol	Cyclic with Master C1 and acyclic with Master C2
Software for PC	SIMATIC PDM

Sensor for SITRANS DA400
Structure	Piezo-ceramic sensor with pre-amplifier Electronics poured 4-wire cable with anti-kink sleeve
Rated conditions
Permissible ambient temperature	-40 °C ... +110 °C (-40 °F ... +230 °F)
Degree of protection to EN 60529	IP66/IP68
Mechanical load	Class 4M7 to DIN EN 60721-3-4
Climatic category	Class 4K4 to DIN EN 60721-3-4
Design
Housing material	Stainless steel 1.4571 (316Ti SST)
Cable	Ends with connector sleeves and cable lug for connection to SITRANS DA400
Weight	125 g (0.276 lb)
Dimensions (W x L x H) in mm (inch)	26 x 40 x 29 (1.0 x 1.6 x 1.1)
Power supply	3.3 V DC / <5 mA suplly from device
Certificates and approvals
Explosion protection to ATEX	In preparation

Safety barriers for sensors
Applications	For intrinsically safe energy supply to the acoustic sensors in zone 1. Insert between diagnostic unit and sensors.
Input	Maximum of 2 sensors can be connected.
Rated conditions
Permissible ambient temperature	-20 °C ... +60 °C (-4 °F ... +140 °F)
Degree of protection to EN 60529	IP20
Design
Housing material	Plastic polyamide
Weight	115 g (0.254 lb)
Dimensions (W x L x H) in mm (inch)	77 x 67.5 x 39.5 (3.0 x 2.7 x 1.6)
Certificates and approvals
Explosion protection to ATEX	II (2) G [EEx ib] IIC

Чертеж

Sensor for SITRANS DA400, dimensions in mm (inch)

SITRANS DA400, dimensions in mm (inch)

Схема подключения

SITRANS DA400, terminal assignment

Заказные данные [PDF]

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Заказные данные

Заказной №	Описание	Вес (кг)	Доставка	Мин. зак. (шт)
7MJ2000-.....	ACOUSTIC SENSORS FOR ACOUSTIC DIAGNOSTIC SITRANS DA400 STAINLESS STEEL BODY WITH IP66/IP68 DEGREE OF PROTECTION ELECTRONIC ENCAPSULATED PERMISSIBLE AMBIENT TEMPERATURE FOR OPERATION MAX. -40 TO +110C (-40 TO +230 F) EX-VERSION -20 TO +50 C (-4 TO +122 F)	1	6 - 8 недель (C)	1
7MJ2010-1AA	EX- BARRIER FOR MAX. 2 ACUSTIC SENSORS RAIL MOUNTING, OUTSIDE EX-ZONE, NS32 RESP. NS35/7.5 INPUT CIRCUIT TO SITRANS DA400 OUTPUT CIRCUIT II (2) G ( EEX IB ) (EUROPEAN ATEX) BODY MADE OF PLASTICS WITH IP20 DEGREE OF PROTECTION PERMISSIBLE AMBIENT TEMP. MA	1	по запросу (D)	1
7MJ2400-.....	ACOUSTIC DIAGNOSTICS SITRANS DA400 WITH ON-SITE OPERATION AND CONFIGURATION, MONITORS UP TO 4 ACOUSTIC SENSORS AND OPTIONAL 4 UNIVERSAL INPUTS FOR DIGITAL (24V DC ACTIVE/PASSIVE) OR ANALOG (0/4 ..20MA) SIGNALS 6 DIGITAL OUTPUTS FOR SIGNALING, MAKROLON (PL	2.5	по запросу (D)	1