DATA SHEET Flowmeter for the continuous measurement of water • Ultrasonic flowmeter using transit time method • Dynamic range ≥ 1:250 • Low pressure drop • No flow-settling section necessary in the inlet or outlet Product variants described in the data sheet may differ from the product presentation and description. Can be combined with Type 8032  Flowmeter/Threshold detector with paddle wheel Type 8611  eCONTROL - Universal controller Type 8802  ELEMENT continuous control valve systems overview Type 8619  multiCELL - Multi-channel and multi-function transmitter/controller 1000106406 | Standard | EU | en | 201911 | 08 © Christian Bürkert GmbH & Co. KG, Subject to alteration Type description The Type 8081 ultrasonic flowmeter is intended for the flow measurement of water which may be slightly charged with contaminants. It consists of an electronic module and a brass fitting with a built-in measuring tube. In combination with a controller and a control valve, it enables very simple flow control loops to be established. The electrical connection is made via a 5 pin M12 fixed connector. The flowmeter features, depending on the version: • a pulse output or • a pulse output and a 4…20 mA current output. Each version is available for 5 different flow ranges: • model QN 0.6 DN15: 0.06 to 20 l/min (nominal flow rate 0.6 m3/h namely 10 l/min) • model QN 1.5 DN15: 0.1 to 50 l/min (nominal flow rate 1.5 m3/h namely 25 l/min) • model QN 2.5 DN20: 0.16 to 82 l/min (nominal flow rate 2.5 m3/h namely 41 l/min) • model QN 3.5 DN25: 0.6 to 116 l/min (nominal flow rate 3.5 m3/h namely 58 l/min) • model QN 6.0 DN25: 1 to 200 l/min (nominal flow rate 6.

Table of contents 1. General Technical Data Visit product website 

1. General Technical Data Note: If the device is mounted in a humid environment or outside, then the maximum voltage allowed is 35 V DC instead of 36 V DC. Product properties Material Please make sure the device materials are compatible with the fluid you are using. Detailed information can be found in chapter “3.1. Chemical Resistance Chart – Bürkert resistApp” on page 5. Non wetted parts Housing Cover Screws Fixed connector M12 Wetted parts Fitting Measuring tube Seal Dimensions Measuring element Measuring range Pipe diameter Performance data Measurement deviation Repeatability Electrical data...

Pressure PN16 (232.16 PSI) Process/Port connection & communication Process connection G or NPT external thread; ¾", 1" or 1"¼ Electrical connection 5 pin M12 male fixed connector for female 5 pin M12 cable plug (not provided) Approvals and certificates Standards Protection class according to EC/ I EN 60529 Directives CE directives Pressure equipment directives IP65 with M12 cable plug plugged-in and tightened The applied standards, which verify conformity with the EU Directives, can be found on the EU Type Examination Certificate and/or the EU Declaration of conformity (if applicable) Complying...

3. Materials 3.1. Chemical Resistance Chart – Bürkert resistApp Bürkert resistApp – Chemical Resistance Chart You want to ensure the reliability and durability of the materials in your individual a pplication case? Verify your combination of media and materials on our website or in our resistApp. Start Chemical Resistance Check Element Screws Cover M12 fixed connectors Seal Housing Fitting and measuring tube (inside fitting) Seal Material Stainless steel PPS PA Silicone PPS Brass and PES EPDM 4. Dimensions Note: Specifications in mm Visit product website  

5. Performance specifications 5.1. Measurement deviation diagram 1000 Flow rate in l/min 6. Product installation 6.1. Installation notes Note: • The flowmeter is not designed for gas and steam flow measurement. • Minimum straight upstream and downstream distances are not necessary. The correct direction of fluid flow in the pipe is indicated with an arrow, engraved on the underside of the fitting. The flowmeter can be installed into either horizontal or vertical pipes. When horizontally mounted, the max. fluid temperature is 90 °C. The max. fluid temperature must be reduced to 80 °C when the...

The 8081 works correctly when the pipe is full and free of any air bubbles near the flowmeter. In presence of bubbles in the pipe, the left installation no.1 should be avoided. If the absence of any air bubbles cannot be guaranteed, the device should be fitted on a horizontal pipe, with the electronic enclosure facing down. This way, the bubbles will not interfere with the propagation of ultrasound waves. It is equally advisable to place stop valves before and after the flowmeter, in order to facilitate the assembly and disassembly of the latter. 7. Product operation 7.1. Measuring principle...

8.2. Bürkert product filter Bürkert product filter – Get quickly to the right product You want to select products comfortably based on your technical requirements? Use the Bürkert product filter and find suitable articles for your application quickly and easily. Try out our product filter 8.3. Ordering chart Model QN 0.6 Flow range 0.06…20 l/min Process connection External thread G ¾” External thread NPT ¾” External thread G ¾” External thread NPTx¾” External thread G 1" External thread NPT 1" External thread G 1"¼ External thread NPT 1"¼ External thread G 1"¼ External thread NPT 1"¼ Outputs...

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