Q: Different From The Design Concept:

Flameproof definition: It can withstand the explosive pressure of internal explosive gas mixture. And can prevent the internal explosion from spreading to the explosive mixture around the enclosure of electrical equipment enclosure (zone I explosion-proof technology). Dangerous gases are allowed to enter the flameproof enclosure, which may cause an explosion. However, the enclosure must have sufficient strength. And each shell joint surface must have a sufficiently long engagement length and a sufficiently small gap. To ensure that the internal explosion will not pass through the flameproof joint and cause the external environment to explode. Clearance explosion-proof technology. Rely on the gap and mesh length to achieve the effect of cooling and flameout. Definition of intrinsic safety: Any electric spark or any thermal effect generated under the conditions specified in the standard (including normal operation and specified fault conditions) cannot ignite the circuits in the specified explosive gas environment (Zone 0/I explosion-proof technology). It is a “safe” technology that uses suppression of ignition source energy as an explosion-proof method. It is required that the electric spark or thermal effect that the equipment may produce under normal operation or failure state are respectively less than the minimum ignition energy and self-ignition temperature of the explosive dangerous gas. For example: hydrogen 19uJ 560℃. Intrinsically safe technology is actually a low-power design technology. Therefore, it can be well applied to industrial automation instruments.

Q: Different From The Application Area

Explosion-proof applicable area: It can only be installed in hazardous locations in Zone 1 or Zone 2. Intrinsically safe application area: Exia: Equipment that can maintain explosion-proof performance until two components or other types of failures. Intrinsically safe equipment can be installed in hazardous locations in Zone 0, Zone 1, and Zone 2. Exia intrinsically safe equipment is the only explosion-proof electrical equipment that can be installed in zone 0. Exib: Equipment that can maintain explosion-proof performance until a component or other type of failure. Intrinsically safe equipment can be installed in hazardous locations in Zone 1 and Zone 2. Extended Reading: How many types of level transmitters are there?

Question 1

Different From The Design Concept:

Accepted Answer

Flameproof definition:

It can withstand the explosive pressure of internal explosive gas mixture. And can prevent the internal explosion from spreading to the explosive mixture around the enclosure of electrical equipment enclosure (zone I explosion-proof technology).

Dangerous gases are allowed to enter the flameproof enclosure, which may cause an explosion. However, the enclosure must have sufficient strength. And each shell joint surface must have a sufficiently long engagement length and a sufficiently small gap. To ensure that the internal explosion will not pass through the flameproof joint and cause the external environment to explode.

Clearance explosion-proof technology. Rely on the gap and mesh length to achieve the effect of cooling and flameout.

Definition of intrinsic safety:

Any electric spark or any thermal effect generated under the conditions specified in the standard (including normal operation and specified fault conditions) cannot ignite the circuits in the specified explosive gas environment (Zone 0/I explosion-proof technology).

It is a “safe” technology that uses suppression of ignition source energy as an explosion-proof method. It is required that the electric spark or thermal effect that the equipment may produce under normal operation or failure state are respectively less than the minimum ignition energy and self-ignition temperature of the explosive dangerous gas. For example: hydrogen 19uJ 560℃.

Intrinsically safe technology is actually a low-power design technology. Therefore, it can be well applied to industrial automation instruments.

Question 2

Different From The Application Area

Accepted Answer

Explosion-proof applicable area: It can only be installed in hazardous locations in Zone 1 or Zone 2.

Intrinsically safe application area:

Exia: Equipment that can maintain explosion-proof performance until two components or other types of failures. Intrinsically safe equipment can be installed in hazardous locations in Zone 0, Zone 1, and Zone 2. Exia intrinsically safe equipment is the only explosion-proof electrical equipment that can be installed in zone 0.

Exib: Equipment that can maintain explosion-proof performance until a component or other type of failure. Intrinsically safe equipment can be installed in hazardous locations in Zone 1 and Zone 2.

Extended Reading: How many types of level transmitters are there?

Question 3

What should I avoid with ultrasonic level sensors?

Accepted Answer

Application variables to avoid using ultrasonics are extreme foam, vapor, turbulent flow or installation in tall fittings with narrow risers.

Foam, steam and turbulence can absorb and/or deflect most of the return signal.

Tall riser fittings can disrupt the acoustic signal path. Proper product selection and installation is important.

Extended reading: Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

Question 4

Why ultrasonic sensor is not accurate?

Accepted Answer

The reason for the measurement failure of Ultrasonic Level Sensor is that the measurement distance of the ultrasonic level gauge refers to the calm liquid level. When the liquid level in the container fluctuates or is stirred, the liquid level is not calm and the reflected signal will weaken. to less than half of the normal signal, so the measurement value of the ultrasonic level gauge will be disturbed.

We want to eliminate the influence of agitation in the container on Ultrasonic Level Sensor measurement. We need to choose an ultrasonic level gauge with a larger range. If the actual range is 5 meters, use an ultrasonic level gauge with a range of 10 meters or 15 meters to measure.

If the Ultrasonic Level Sensor is not replaced, and the liquid in the tank is non-viscous. A still-pipe can also be installed. Place the Ultrasonic Level Sensor probe in the still-pipe to measure the height of the level gauge. Because the liquid level in the waveguide is basically stable. At the same time, it is recommended to change the two-wire Ultrasonic Level Sensor to a four-wire one.

Extended reading: Magnetostrictive Level Transmitter Working Principle

Question 5

How does an ultrasonic level sensor work?

Accepted Answer

The ultrasonic sensor is an ultrasonic pulse signal sent by an ultrasonic probe, which propagates in the gas and is reflected after encountering the interface between the air and the liquid. high.

Extended reading: Radar Level Sensor Working Principle

Month: April 2022

Explosion Proof Ultrasonic Level Sensor| Hazardous Area-Non Contact

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