www.gemu-group.com6 / 34GEMÜ 3040
4 Correct use
Its performance features include the following properties:
– No moving parts and therefore no wear
– High level of reproducibility
– Simple cleaning
– Tamper-proof design
– Compact design
– Integrated empty pipe detection
– Integrated batch control function with preset and cor-
rection quantity
– High chemical resistance
3.2.2 Measurement principle
Swimming against the current requires more strength than
swimming with the current. The ultrasonic flow measurement
in accordance with the phase differential method is based on
this simple physical fact:
Two sensors opposite each other alternately send and receive
ultrasonic signals. With a standing medium, both sensors re-
ceive the sent ultrasonic signals within the same phase, i.e.
no difference in phase occurs. With a flowing medium, a
phase shift takes place. When measured in the direction of
flow, it is different than when measuring against the direction
of flow. This phase difference is directly proportional to the
flow velocity. The flow volume is determined from the flow ve-
locity and the known pipe diameter.
Transmitter/
receiver
Receiver/
transmitter
Phase in flow direction
Phase against the flow direction
L: Metering tube length
K: Factor
D: Metering tube diameter
v: Flow velocity
c: Sound velocity of the liquid
Fig.3: Schematic diagram of ultrasonic flow measurement
3.2.3 Operational safety
Wide range of self-tests provide maximum possible opera-
tional safety.
Any occurring errors (process or system errors) are output at
a digital output or shown in the display.
The protection class is IP 67.
The product fulfils the general EMC immunity requirements in
accordance with CE, EN 61000-6-3, EN 61000-4-2, EN
61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6.
The product fulfils the conditions with regard to the safe extra
low voltage (EN 50178, SELV, PELV).
3.3 Product label
3040 20D 92214 MC1D 51D
GEMÜ Gebr. Müller Apparatebau GmbH& Co. KG
Fritz-Müller-Straße 6-8
74653 Ingelfingen-Criesbach
Art.Nr.: 88701777
Fab.Nr.: 20823
Made in Germany
1 VCC G 1
2 Q1 max: 60 l/min
3 GND 18...30VDC
4 Com 10 Bar
5 QA IP67
Tmax: 80°C
4 3
5
2
1
Product type/order code
Specification
The month of manufacture is encoded in the product type/or-
der code and can be obtained from GEMÜ.
The product was manufactured in Germany.
4 Correct use
DANGER
Danger of explosion
▶ Risk of death or severe injury.
● Do not use the product in potentially
explosive zones.
WARNING
Improper use of the product
▶ Risk of severe injury or death.
▶ Manufacturer liability and guarantee will be void.
● Only use the product in accordance with the operating
conditions specified in the contract documentation and in
this document.
The product is not intended for use in potentially explosive
areas.
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