1. overview
WHIKDThe explosion-proof flow switch can be widely used for flow detection in flammable and explosive places such as petroleum, chemical, power, metallurgy, etc.
The thermal mass flow switch is based onL.V.KingDesigned based on the principle of heat exchange, a flow sensor is installed at the front end, and there are two resistors inside the probe in contact with the medium. One measures the temperature of the medium, while the other measures and heats it up. When there is no medium flow, the temperature difference between the two resistors is maximum. When there is medium flow, the temperature difference between the two resistors decreases. The magnitude of the temperature difference is only related to the flow rate of the medium. The larger the flow rate, the smaller the temperature difference. When there is no flow, the temperature difference is maximum, and it is also related to the thermal conductivity temperature of the medium itself. When the flow rate is lower or higher than a certain set value, the relay is turned on or off, and the switch signal is output.
The explosion-proof mark of this product is ExdIICT6 Gb, in accordance withGB3836.1andGB3836.2Relevant standard requirements.Suitable for Zone 1 and Zone 2 explosive hazardous environments, Class IIA, IIB, IIC, ignition temperature group
A place where flammable gases or vapors from groups T1 to T6 form explosive mixtures with air.
Note: When using this instrument, it is strictly prohibited to open the cover or operate it with electricity.
2. Product Features
lNo mechanical movable parts, corrosion-resistant, stable and reliable, long service life, long-term operation without special maintenance;
lThe integrated design of the detection probe and signal processing circuit makes installation and use extremely convenient;
lBuilt in temperature compensation circuit minimizes the error caused by the medium and ambient temperature on the fluid flow rate;
lOptimal selection of new circuits with low heat generation, chip mounted components, and high reliability;
lThis product has a built-in relay that only outputs switch signals.
3.Main technical parameters
Voltage: 24VDC
Environmental temperature: -20~80 ℃
Relative humidity: 5% to 95%
Nominal pressure: 0-10Mpa
Gas flow rate: 0-30m/s
Liquid flow rate: 0-10m/s
Protection level: IP65
Explosion proof mark: Ex d Ⅱ CT6 Gb
Installation method: Threaded G3/4
