Dwyer MFS User Manual
Table of contents page
1. Device description and intended use ...............................................................................................2
2. Safety instructions ............................................................................................................................2
2.1 Qualified personnel ...................................................................................................................3
2.2 Special safety instructions ........................................................................................................3
3. Unpacking and inspecting the delivery.............................................................................................4
4. Material specifications of components .............................................................................................4
5. Suitable liquids (medium) .................................................................................................................4
6. Installation of the flow sensor ...........................................................................................................4
6.1 Mechanical installation..............................................................................................................4
6.2 Electrical connection .................................................................................................................6
7. Maintenance and repairs ..................................................................................................................7
8. Decommissioning and disposal........................................................................................................7
9. Technical data ..................................................................................................................................7
10. Dimensions, pressure drop...............................................................................................................8
Device description and intended use Series MFS
1 Device description and intended use
Series MFS sensors are used for continuously measuring flow rates or dosing electrically conductive liquids. The
operational safety of the supplied equipment is only guaranteed if it is operated according to its intended use
(measuring and dosing of liquids). The specified limit values (see the chapter “Technical Data”) should never be
exceeded.
It is the user's responsibility to select the appropriate technology which is suitable for the specific application, to
install it correctly, to carry out tests, and to maintain all the components.
The magnetic inductive flow sensor features no moving parts and is, therefore, almost wear free and suitable for
a wide range of measuring applications. A flow-proportional frequency signal is provided as the output signal.
Product label
Functional principle
The magnetic inductive flow sensor functions according to the induction principle:
The measuring pipe is located in a magnetic field (B). If an electrically conductive medium (V) flows through the
measuring pipe and, therefore, at right angles to the magnetic field, a voltage (U) which is proportional to the
mean flow velocity will be induced in the medium and subsequently picked up by the two electrodes.
Fig. 1: Functional principle
2 Safety instructions
Always read the operating instructions carefully prior to installing the new product. Always adhere to the
instructions contained herein, especially the safety instructions, otherwise there is a potential risk of personal
injury and damage to instruments and systems.
Even though assistance is provided through personal consultation or this manual, it is the responsibility of the
customers to determine the suitability of the product for the specific application.
The magnetic inductive flow sensors are state-of-the-art devices, concerning the accuracy, functioning and safe
operation of the device.
However, professional and safety conscious conduct of the operator is required to ensure safe operation.
Technical changes reserved 2 08/2011
Safety instructions Series MFS
2.1 Qualified personnel
The personnel entrusted with installing, operating and maintaining the MFS have to be suitably qualified;
the required knowledge can be gained via training courses or appropriate on-the-job instruction. The
personnel must be familiar with the contents of these instructions, which need to be available to them at all
times.
The electrical connection should only be carried out by a fully qualified electrician.
All work has to be carried out in accordance with existing national regulations on accident prevention and
safety at work and with any internal regulations of the operator, even if they are not specified in these
instructions.
2.2 Special safety instructions
To avoid damage to the flow sensors and the monitored system, only use our flow sensors to measure
liquid flows.
Prior to installation, ensure whether the material of the flow sensor is suitable for the medium to be
measured.
In order to achieve accurate measurements, only use liquids with a minimum conductivity of 50 S/cm.
Ensure that the maximum specified operating pressure is not exceeded.
Never remove a flow sensor from a pipe system under pressure.
Ensure that the maximum specified operating temperatures are not exceeded.
Select suitable measures to prevent the medium from freezing in the flow sensor.
Protect the flow sensor against external magnetic fields in the immediate vicinity, since these can impair
device functioning.
Caution: Voltage Hazard!
Always de-energize the system before connecting the connector cable.
It is prohibited to remove or make product labels or any other information attached to the equipment
indecipherable, otherwise all warranties and the responsibility of the manufacturer no longer apply.
Caution: Ensure that the maximum electrical load specified on the product label is never exceeded,
otherwise the electronic unit will be damaged.
Attention: Do not use MFS in processes in which a disturbance may possibly cause a risk of the health
and lives of others.
The customer is to verify the applicability of the product on the basis of our technical details and customer-
and applicationspecific test to proof the products fitness for ist purpose. By this checking, hazards and risks
are subrogated to the customer and our warranty expires.
For problems or questions contact:
DWYER INSTRUMENTS, INC.
P.O. Box 373
Michigan City, INDIANA 46361, U.S.A.
Phone: (219) 879 - 8000
Fax: (219) 872 - 9057
Email: info@dwyer-inst.com
Technical changes reserved 3 08/2011
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