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YL-802 Intelligent Negative Pressure Controller

The YL-802 intelligent negative pressure controller, also known as negative pressure switch or vacuum switch, is an intelligent control instrument that integrates negative pressure measurement, display, and control. It has the characteristics of simple operation, good seismic resistance, high control accuracy, adjustable control range, and long service life. This controller has multiple additional functions such as delay control, reverse control, switching between three pressure units, and one key error clearing. It can replace mechanical vacuum switches and vacuum controllers, and can be used for measuring various vacuum degrees. It can be matched with various oil and oil-free vacuum pumps. Replacing the vacuum pressure gauge switch, with high accuracy, fast response, and convenient pressure reading. Replacing mechanical vacuum switches and using vacuum pumps to achieve more accurate pressure control and real-time pressure display

  • Introduction

    The YL-802 intelligent negative pressure controller, also known as negative pressure switch or vacuum switch, is an intelligent control instrument that integrates negative pressure measurement, display, and control. It has the characteristics of simple operation, good seismic resistance, high control accuracy, adjustable control range, and long service life. This controller has multiple additional functions such as delay control, reverse control, switching between three pressure units, and one key error clearing. It can replace mechanical vacuum switches and vacuum controllers, and can be used for measuring various vacuum degrees. It can be matched with various oil and oil-free vacuum pumps. Replacing the vacuum pressure gauge switch, with high accuracy, fast response, and convenient pressure reading. Replacing mechanical vacuum switches and using vacuum pumps to achieve more accurate pressure control and real-time pressure display


  • Structure and dimensions

    YL-802尺寸图


  • Parameter
    Range    0~-100Kpa
    Accuary    1.0%FS
    Supply voltage    24V DC  220V AC
    Alarm point setting    -3Kpa~-120Kpa
    output signal    Relay
    load capacity    220V  5A   24V  5A
    Sampling rate    5 times / second
    Operating temperature    -20℃~65℃
    Measuring medium    Non-corrosive medium for stainless steel
    Installation interface    M20*1.5
    Electrical protection    Reverse polarity protection, short circuit protection (24VDC),anti-electromagnetic protection
    Dial diameter    80mm


  • Process

    Retail: Contact customer service - Consult product parameters-Confirm product model-Payment-Logistics shipment-Sign for delivery
    Key customers: Contact customer service-Consult industry solutions-Confirm product model parameters-Sign relevant technical contracts-Payment-Logistics shipment-Sign for receipt


  • After-sales

    1. LONGLV provides customers with installation and debugging services, as well as other technical consultations. If necessary, technical personnel can provide on-site technical training. If the customer has any technical questions, the technical personnel will provide a response within 4 hours.
    2. LONGLV products are strictly designed and produced in accordance with the ISO9001 international quality system, with a 1-year warranty for sensor products and a 3-year warranty for instrument products, with a 7-day return and exchange policy and lifelong maintenance.
    (Human damage is not covered by the warranty, and customized products without quality issues are not returned or replaced.)
    3. For returns and exchanges caused by quality issues, Longlv will bear the return and exchange shipping costs. The cost of returns andexchanges for non quality issues will be borne by the customer.
    Note: Quality issues refer to customized parameters such as function, size, specifications, and installation method that are not customized according to customer requirements, do not meet functional requirements, have dimensional errors, and have inaccurate accuracy (excluding within the error range).
    Customized products require confirmation of drawings by both parties before processing and production. If the product does not meet customer requirements, a written objection must be raised within two weeks. If the customer does not raise an objection within the specified time limit, it will be deemed as qualified acceptance.
    If an objection is raised within the deadline and it is confirmed by both parties that it is a product quality issue or production has not been carried out according to the requirements confirmed by both parties, it can be exchanged or refunded. If there are no quality issues and the shipping model andthe contract signed model are complete and correct, no return or exchange service will be provided.
    4. The products returned for repair will have a test result issued within 3 working days and the repair will be completed within 7 working days.
    After sales consultation
    Technical consultation, factory repair, invoices, complaint suggestions, and other related issues. After sales service hotline 021-51601181


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    Hutai Road, Gucun Town, Baoshan District, Shanghai

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