Page 353 - Bürkert

Ultrasonic flow meter for continuous measurement of water

8081 • Ultrasonic flowmeter using transit time

method
• Dynamic range ≥ 1:250
• Low pressure drop
• No flow-settling section necessary in
the inlet and/or outlet

The 8081 ultrasonic flowmeter is intended for the measurement of water Envelope Dimensions [mm] (see datasheet for details)
flows which may be slightly charged with contaminants. It consists of
an electronic module and a brass fitting with a built-in measuring tube.
It enables a control loop to be established. The electrical connection is DN A B C
made via an 5-pin M12 fixed connector. 15 90 65.5 76.5 A
20 90 65.5 79.0
25 90 65.5 83.5
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 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
B
3
(nominal flow rate 1.5 m /h namely 25 l/min)
• model QN 2.5 DN20: 0.16 to 82 l/min
3
(nominal flow rate 2.5 m /h namely 41 l/min) C
• model QN 3.5 DN25: 0.6 to 116 l/min
3
(nominal flow rate 3.5 m /h namely 58 l/min)
• model QN 6.0 DN25: 1 to 200 l/min

(nominal flow rate 6.0 m3/h namely 100 l/min)
B
Technical Data L5
General data
Process connection G or NPT External thread; 3/4”, 1” or 1 1/4” H
Materials
Housing, cover PPS
Fixed connector M12 PA A
Seal Silicone h
Materials wetted parts
Fitting Brass L1
Measuring tube PES L3
Seal EPDM
Electrical connection 5-pin M12 male fixed connector for female
5-pin M12 cable plug (not provided)
Connection cable 1.5 mm max. cross-section
2
L4
Complete device data (fitting + electronic module)
Pipe diameter DN15-25
Measuring range 0.06 to 200 l/min L2
Measuring element 2 ultrasound emitter-receiver cells
Medium temperature +5 °C to +90 °C DN A B H h L1 L2 L3 L4 L5
15 G / NPT 3/4” 65.5 76.5 14.5 110 90 67 6.5 19.5
20 G / NPT 1” 65.5 79.0 18 130 90 67 6.5 19.5
25 G / NPT 1 1/4” 65.5 83.5 23 260 90 67 6.5 19.5

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