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      • Formaldehyde Sensor SFA30

        Formaldehyde Sensing Made Easy

        The SFA30 is Sensirion’s new digital formaldehyde sensor designed for easy integration into air purifiers, demand-controlled ventilation systems, or indoor air quality monitors. Based on Sensirion’s electrochemical technology, the SFA30 offers excellent formaldehyde sensing performance with a uniquely low cross-sensitivity to other VOCs. The sensor module’s on-board SHT sensor provides accurate humidity and temperature readings and enables a fully temperature/humidity compensated and factory calibrated formaldehyde concentration output in ppb.

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      • Product Highlight

        Evaluation kit for the single-use liquid flow sensor LD20-2600B

        The LD20-2600B single-use liquid flow sensor for fast, precise and reliable measurements of the lowest flow rates in biomedical applications was successfully launched three years ago. The evaluation kit for this OEM liquid flow sensor can now also be purchased online via Sensirion's distribution network.

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    • Flow Sensors
    • Liquid Flow Meters
    • SLx – Standalone Liquid Flow Meters
    • Liquid Flow Meter SLQ-QT500

    Liquid Flow Meter SLQ-QT500

    Versatile Liquid Flow Meter for up to 120 ml/min and Highly Viscous Fluids

    The SLQ-QT500 features a flow range of up to 120 ml/min for water-based and hydrocarbon-based liquids, such as alcohols, solvents, oil, fuel and adhesives. It is the first choice for measurement of liquids containing particles or with a high viscosity. The SLQ-QT500 in combination with one of the SCC1 sensor cables can be easily integrated into demanding coating systems in the semicon industry, as well as into a wide array of dispensing and liquid flow systems in other industries.

    The high sensitivity and measuring speed offers new possibilities for the monitoring and control of fast dispensing processes. The sensor is available with calibrations for H2O and isopropanol (IPA). Due to its micro-thermal measurement principle and large inner diameter, the measurement performance of the SLQ-QT500 does not depend on the viscosity itself, and so there is no strict upper or lower viscosity limit (e.g. kinematic viscosities of up to ~1000 mm2/s). It is also ideal for liquids that contain small particles, as long as they do not abrade the quartz glass tube.

    For wetted parts, only PFA for the fittings and quartz glass for the inner flow channel have been chosen. As with all other Sensirion liquid flow meters, this reliable device has no moving parts and measures through the wall of a straight flow path.

    The SLQ-QT500 liquid flow meter in combination with one of the SCC1 sensor cables offers a modular solution with a suitable electrical interface for almost any environment:

    • The SCC1-USB sensor cable provides a plug-and-play connection to a PC for operation with Sensirion’s viewer software or user-built programs for laboratory and desktop applications.
    • The SCC1-RS485 sensor cable featuring a stable RS485 interface and including advanced functionality such as dispense volume totalizer, automatic dispense detection, and data buffer for asynchronous read-out is designed for demanding industrial automation environments.
    • The SCC1-Analog sensor cable allows simple and quick readings or integration into generic controller systems without programming. In addition to a 0-10 V analog voltage output, the cable provides a configurable digital (high/low) output that can be programmed to act as a flow switch or pulse output.

    Features

    • Maximum flow rate for hydrocarbons and water-based liquids: 120 ml/min
    • For high- and low-viscosity liquids or for liquids with small particles
    • Fast response time down to 50 ms
    • Highest sensitivity down to the lowest flow rates
    • RS485, USB, or 0-10 V analog voltage output
    • Straight flow path, no moving parts
    • Assured purity
    • Superb chemical resistance
    • Inert wetted materials: PFA and quartz glass 
    • Maximum recommended operating pressure: 12 bar

    Applications

    • High-end semiconductor process control
    • High-viscosity applications
    • Industrial automation
    • Fast dosing operations

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    Here you can find all documents of Sensirion's liquid flow meters for download.


    Related Discussion: Viscosity

    The viscosity of a liquid describes its “thickness” or resistance to an external force. Low viscosity liquids include ether, acetone, gasoline, and water (kinematic viscosity ≤ 1.0 mm2/s). Medium range viscosity liquids typically are engine oils, vegetable oil, propylene glycol and photoresist. Common high viscosity liquids include, for example, grease, honey, high-viscosity photoresist, and adhesives. Typically, the viscosity of a liquid depends strongly on its temperature. Although the measurement performance of the SLQ-QT500 liquid flow meter does not depend on the viscosity itself, the sensor’s signal depends on the flow distribution inside the sensor tube and, in turn, the flow distribution depends on the viscosity. On the low-viscosity side, the flow rate is limited by fluidic effects, such as inlet conditions (e.g. changes in tubing diameters, bends in the inlet tube, etc.) and turbulence. On the high-viscosity side, the flow rate is limited by the tolerable pressure drop in the system. This limit depends heavily on the application.

    Please click here to contact our sensor experts in order to discuss your high-viscosity application.


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    Related Products

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    The SLF3x with a radically optimized mechanical design, takes the well-established functionality to the next level in price-performance ratio. The sensor maximizes safety, stability and long-term reliability in a vast range of applications.

    Sensirion Liquid Flow Meters SLI

    Liquid Flow Meter SLI

    The SLI mass flow meter series for liquids are for integration into demanding fluidic systems, ensures highly accurate measurements at low flow rates, and makes reliable and accurate dosage possible.

    Sensirion Liquid Flow Meters SLS 1500

    Liquid Flow Meter SLS-1500

    The SLS-1500 flow meter enables fast and precise measurements for flow rates of 0–40 ml/min. The inert, wetted materials of the sensor provide outstanding chemical resistance and biocompatibility.

    Sensirion Liquid Flow Meters SLQ-QT105

    Liquid Flow Meter SLQ-QT105

    The SLQ-QT105 flow meter is characterized by high sensitivity, reliability, and speed, and is ideally suited for measuring hydrocarbon-based liquids like photoresists and solvents.

    Sensirion Liquid Flow Meters SLG

    Liquid Flow Meter SLG

    The SLG flow meter series is ideal for monitoring rapidly changing ultralow flow rates in UHPLC applications and provides high pressure resistance of the flow channel and fast response time.

    Sensirion Liquid Flow Meters LG16

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    The small, pressure-resistant LG16 flow meter is used for measuring flow rates of less than 80 ml/min. Thanks to the short response time, the sensor makes it possible to detect air bubbles.

    Sensirion Liquid Flow Meters LG01

    Liquid Flow Meter LG01

    The flow switch and bubble detector LG01 measures flow rates of just a few milliliters per minute and below. It is characterized by excellent biocompatibility and chemical resistance.

    Sensirion Liquid Flow Meters LS32 1500

    Liquid Flow Meter LS32-1500

    The compact LS32-1500 flow meter measures flow rates in the 0–40 ml/min. range, is extremely robust in terms of mechanics and is characterized by its excellent repeatability and fast response time.

    Sensirion Liquid Flow Meters LPGx

    Liquid Flow Sensor LPG10

    The LPG10 OEM flow sensor on a surface of just 10 mm × 10 mm offers a smart, accurate and fast sensor solution for flow rates of only a few microliters per minute to up to 1 ml/min.

    Liquid Flow Sensor LD20

    The single-use LD20 flow sensors measure flow rates within a range of 0–1000 ml/h. The cost-effective sensors enable safe and reliable applications in the field of medical and biomedical technology.

    Sensirion Customized Solutions

    Customized (OEM) Liquid Flow Meters

    Besides the standard gas flow sensor solutions, we also offer customized OEM sensor solutions at an attractive price performance ratio. We adapt or develop your customized liquid flow meters.

    Sensirion Liquid Flow Meters Flow Meter Kit SLI

    Liquid Flow Meter Kits

    For quick and easy measurements of all liquid flow meters, a test kit can be ordered. The liquid flow meter kit provides a first impression of the performance of the sensors.

    Technical Documents

    • Datasheet SLQ-QT500
    • Calibration Certification SLQ-QTxx
    • CAD Model SLQ-QT500

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