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28/02/249

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ASL453/24 Công tắc lưu lượng khí điện tử Fema, Đại lý Fema Viet Nam

Model: ASL453/24

Hãng: Fema

ĐẶC ĐIỂM KỸ THUẬT:

Đầu ra SPDT: 230V 8A

Nguồn điện: 24V

Nhiệt độ: -20…+100°C

Độ chính xác: <2%

ASL453/24 Công tắc lưu lượng khí điện tử Fema, Đại lý Fema Viet Nam

Hotline: 0933.911.903

Mail: thietbicongnghiepltt@gmail.com

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ASL453/24

Electronical air flow switch for air (SLF + ASL)
Evaluation Units for SLF3 sensor
Evaluation Unit, output SPDT 230V 8A, Power supply 24V

SWL

Air flow monitoring

The SLF... sensor can be used in combination with an ASL… evaluation device to monitor the flow in the air (e.g. in air-conditioning systems).

The switching point is adjustable. While the fan starts up the switch-on bypass is active. The bypass duration (2 – 60 s) is adjustable.

Function

The air flow monitors work according to the calorimetric principle. A thermistor is heated up. As heat is withdrawn by the flowing air, the thermistor resistance alters. The change in resistance is evaluated. As the resistance also depends on the temperature of the medium, the difference must be determined by a second thermistor. The difference is compensated and in this way the switching point is kept stable. Suspended materials adhering to the sensor can have an insulating effect and so affect the measurement result and hence the defined switching point. Therefore it is advisable to remove any dirt during routine maintenance operations.

Switch-on bypass

While the plant is being started up (still no airflow present), the output contact is activated and the flow condition signaled. The time for the switch-on bypass is adjustable from 2-60 s. The start-up or switch-on bypass starts when the unit is switched on. If an external start button (normally closed contact) is connected (to the Z-Z terminals), the start-up bypass begins when the (locking) button is pressed.

Type Supply voltage

SLF3 Sensor, 35 mm                –
SLF15 Sensor, 150 mm            –
ASL453 Evaluation unit            230 V AC
ASL453/24 Evaluation unit        24 V AC/DC

Technical data of sensor:

General

Fast-reacting air flow sensor with movable flange for installation in air ducts. With

temperature compensation, suitable for media with rapid temperature changes.

Medium temperature -20…+100°C

Compensation behavior (Reaction speed on change in medium temperature) fast, approx. 0.3 s

Installation depth 35 resp. 150 mm

Sensor tube diameter 10 mm

Sensor tube material nickel-plated brass

Measuring element

Insensitive to moisture (can be cleaned inwater). Sensitive to mechanical deformation (care must be taken when cleaning with hard objects).

Protection class IP67

Electrical connection

Terminal strip accessible after removal of cover. 3-wire connection to evaluation unit

Mounting conditions

The sensor tip should be placed in the midst of the pipe and must be bathed completely from the medium. Please provide a straight pipe: 5x the pipe diameter before and after the sensor device.

Technical data of evaluation unit:

Power supply 230 VAC or 24 VAC/DC

(see Product Summary)

Power consumption approx. 3 VA

Contact load

Relay, single pole 8 A, max. 250 VAC

Ambient temperature 0 – 60°C

Flow rate

Adjustable from 0.1 to 20 m/s for gaseous media

Response time 1…5 s

Temperatures > 80 °C, degree of contamination and flow velocity will reduce the response time.

Repetition accuracy

<2%, relative to the flow rate directly on the sensor.

Switching hysteresis approx. 2% of overall range

Max. cable length between sensor and evaluation unit

100 m, for shielded cable 1.5 mm2

Sensor protection

In case of breakage or interruption of the

sensor wires, the unit switches off or an

interruption of flow is signaled.

Type of construction Standard housing N 45

Weight approx. 0.35 kg

SLF3

Electronical air flow switch for air (SLF + ASL)

- Price -

ASL453

Evaluation Units for SLF3 sensor

- Price -

ASL453/24

Evaluation Units for SLF3 sensor

- Price -

SWF62

Electronical flow switch for liquid and air (SWF + ASW)

- Price -

SWF62L

Electronical flow switch for liquid and air (SWF + ASW)

- Price -

ASW454

Evaluation Units for SWF62 sensors

- Price -

ASW454/24

Evaluation Units for SWF62 sensors

- Price -

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