Tecfluid M21 Bedienungsanleitung
R-MI-M21 Rev.: 4 English version
Series M21
Variable area flowmeter
Instructions manual
The art of measuring
2
Thank you for choosing a product from Tecfluid S.A.
This instruction manual allows the installation, configuration,
programming and maintenance. It is recommended to read it before
using the equipment.
• This document shall not be copied or disclosed in whole or in any
part by any means, without the written permission of Tecfluid S.A.
• Tecfluid S.A. reserve the right to make changes as deemed
necessary at any time and without notice, in order to improve the
quality and safety, with no obligation to update this manual.
• Make sure this manual goes to the end user.
• Keep this manual in a place where you can find it when you need
it.
• In case of loss, ask for a new manual or download it directly from
our website www.tecfluid.com Downloads section.
• Any deviation from the procedures described in this instruction
manual, may cause user safety risks, damage of the unit or cause
errors in the equipment performance.
• Do not modify the equipment without permission. Tecfluid S.A. are
not responsible for any problems caused by a change not
allowed. If you need to modify the equipment for any reason,
PREFACE
WARNINGS
3
TABLE OF CONTENTS
SERIES M21
1 INTRODUCTION ........................................................................... 6
2 WORKING PRINCIPLE ................................................................... 6
3 RECEPTION .................................................................................. 8
4 INSTALLATION ............................................................................. 8
4.1 Valves ................................................................................ 8
4.2 Filters ................................................................................. 8
4.3 Straight pipe sections ......................................................... 8
5 OPERATION ................................................................................. 9
5.1 Gas flow measurement ....................................................... 9
5.2 Gas damping mechanism .................................................... 10
5.3 Liquid flow measurement .................................................... 11
6 RCA / RCD FLOW REGULATORS .................................................. 12
6.1 Regulation curves ............................................................... 13
AMD LIMIT SWITCH
7 INTRODUCTION ........................................................................... 15
8 OPERATION ................................................................................. 15
9 MOUNTING THE LIMIT SWITCH IN AN EXISTING EQUIPMENT ....... 16
9.1 Kit contents ......................................................................... 16
9.2 Preparing the kit ................................................................. 16
9.3 Assembling the AMD kit ...................................................... 17
9.4 Switching point adjustment ................................................. 18
9.5 Electrical connection ........................................................... 19
9.6 Mounting ........................................................................... 19
10 ELECTRICAL CONNECTION .......................................................... 19
TH6 TRANSMITTERS
11 INTRODUCTION ........................................................................... 20
12 MODELS ...................................................................................... 20
12.1 TH6 ................................................................................... 20
4
12.2 TH6H ................................................................................. 20
13 ELECTRICAL CONNECTION .......................................................... 20
13.1 Power supply and analog output ......................................... 21
14 4-WIRE CONNECTION .................................................................. 21
15 HART TRANSMITTERS ................................................................. 22
15.1 Additional functions with HART communication .................... 22
15.2 HART communication characteristics ................................... 22
16 ”WRITE PROTECT” ....................................................................... 23
17 MAINTENANCE ............................................................................ 24
17.1 Series M21 ........................................................................ 24
17.2 M21 with damping system .................................................. 25
17.3 Potential problems with the metering tube ............................ 25
17.3.1 Jammed float .......................................................... 25
17.3.2 Lack of magnetic field ............................................. 26
17.3.3 Damaged calibrated orifice and/or float .................... 26
17.4 Potential problems with the indicator housing ........................ 26
17.4.1 The indicator pointer rubs on the reading scale ......... 26
17.4.2 Deviation of the zero on the scale ............................ 26
17.5 RCA regulator maintenance ................................................. 27
17.6 RCD regulator maintenance ................................................ 28
17.7 AMD limit switch maintenance ............................................. 29
17.7.1 Electrical verification ................................................ 29
17.8 TH6 transmitter maintenance ............................................. 30
18 TECHNICAL CHARACTERISTICS ................................................... 30
18.1 Series M21 ......................................................................... 30
18.2 AMD limit switch ................................................................. 31
18.3 TH6 transmitter .................................................................. 31
18.3.1 Power supply .......................................................... 31
18.3.2 Outputs .................................................................. 31
18.3.3 General characteristics ............................................ 31
5
19 SAFETY INSTRUCTIONS ............................................................... 32
19.1 Pressure equipment directive .............................................. 32
19.2 Certificate of conformity TR CU (EAC marking) ..................... 32
20 ADDITIONAL INSTRUCTIONS FOR THE ATEX VERSION ................. 33
20.1 Non-metallic parts .............................................................. 33
20.2 Connecting conductive parts to earth .................................. 33
20.3 AMD limit switch ................................................................. .34
20.4 TH6 transmitters ................................................................. 34
20.5 Marking .............................................................................. 35
21 FLOW RANGES ............................................................................ 36
22 DIMENSIONS ............................................................................... 37
23 ATEX CERTIFICATE ...................................................................... 40
24 DECLARATIONS OF CONFORMITY ACCORDING TO ATEX ............ 43
6
SERIES M21
1 INTRODUCTION
The series M21 are flowmeters for liquids, gases and steam.
They are very robust instruments prepared to work under extreme conditions.
They have local flow rate indication by means of magnetic coupling, with scales calibrated in
l/h, m3/h, kg/h, t/h, %, etc.
They can fit switches or electronic transmitters that allow to detect a specific flow rate and
provide a flow rate signal to a remote device.
2 WORKING PRINCIPLE
Based on variable area principle.
The flowmeter consists of a measuring tube and a float inside it. The flow pushes the float to
an equilibrium point. The area obtained between the float and the tube is proportional to the
flow rate.
The equilibrium point depends on:
•E = Force of the fluid flow
•Ff = Weight of the float
•Al = Free area of flow
where:
(Al = Ao, calibrated orifice area, - Af, float area)
7
The M21-H... models have horizontal inlet and outlet, and optionally they can be supplied
with a regulating valve on the inlet.
M21 models always work in a vertical position with upwards flow.
The equilibrium point is determined by considering the fluid force and the float weight.
8
3 RECEPTION
The series M21 flowmeters are supplied conveniently packaged for their protection during
transportation and storage, together with their instructions manual for installation and
operation.
The instruments are supplied tested in our calibration rigs, ready for installation and service.
Before installing the flowmeter, remove all the blocking elements.
With the instrument in its working position, move the float and check that the indicating
needle moves all over the scale and returns to zero.
4 INSTALLATION
Flowmeters models M21 must be installed in a completely vertical position and with upwards
flow direction.
It is important that the position is completely vertical given that deviations of about 5º can
produce errors of about 8-10% of the readings.
4.1 Valves
If the fluid to be measured is a liquid, it is recommended to install a regulating valve before
the flowmeter (see point 5.3), or to use a M21-H... model, which already includes a valve on
the inlet.
For gas flow measurement, the valve position will depend on the calibrating pressure (see
point 5.1).
Valves should always be opened slowly to avoid water hammers.
4.2 Filters
The installation of a filter before the instrument is important, this will avoid possible
obstructions and breakdowns in the measuring system.
The filter mesh should be maximum 200 µm.
In case of having abundant magnetic particles in suspension, it is necessary to mount a
magnetic filter on the inlet of the instrument to avoid the accumulation of particles around the
float, which would make it to jam.
4.3 Straight pipe sections
In order to have stable readings, it is essential to avoid turbulences. To do this, it is
necessary to install the instrument in a straight pipe section. This section should have the
same inner diameter as the flowmeter. The required minimum distances upstream and
downstream of the sensor are the following:
Upstream 5 DN
Downstream 3 DN
These distances must be free of elements that can disturb the flow profile, such as elbows,
diameter changes, valves, etc.
9
5 OPERATION
Once the meter is installed, the regulating valve should be opened slowly. The fluid flow will
move the float which, by means of magnetic coupling, moves the indicating needle.
Any variations of working conditions with respect to those when calibrated can induce
reading errors. The calibration working conditions are indicated on the instrument’s
dataplate.
5.1 Gas flow measurement
The working pressure and temperature are of maximum importance for correct gas
measurement as they directly affect the scale readings.
For example, if a meter is calibrated at 2 bar gauge and the working pressure is 1 bar gauge
there will be an error of about 22%.
In the same way, if working temperature does not match calibrating temperature, errors will
be induced in the flow rate readings.
In applications of gas flow measurement where the calibrating pressure of the instrument
corresponds to the inlet pressure, being higher than the atmospheric pressure, the
regulating valve must be installed downstream of the flowmeter. Thus, it is ensured that the
instrument works at calibrating pressure and a back pressure that keeps the float in
equilibrium is obtained.
NOTE: Scheme valid for gas flow
measurement applications with a pressure
higher than atmospheric. For gases at
atmospheric pressure, turn valves upside
down.
The flow should be adjusted by means of the regulating valve, while keeping the shut off
valve fully open.
REGULATING VALVE
SHUT OFF VALVE
10
If the regulation is done using the shut off valve, in open circuits or at low gas flow in the
meter, the gas will expand which will sharply diminish its density, providing very serious
reading errors.
If the flow is regulated by the shut off valve, the float usually experiences an oscillating
movement which produces a shut off action until sufficient pressure is gained to overcome its
weight. The sudden fall of pressure, when the gas escapes, will make it fall. This cycle is
repeated generating an oscillating measurement (resonance).
In applications where the gas outlet is at atmospheric pressure, install the regulating valve
upstream of the flowmeter if the flowmeter was calibrated at atmospheric pressure. The shut
off valve is then installed downstream of the flowmeter and it should be fully open.
The valve opening procedure should be as following:
- With the regulating valve closed, fully open the shut off valve.
- Gradually open the regulating valve until the desired flow rate.
And for closing:
- Close the regulating valve gradually until zero flow rate.
- Fully close the shut off valve to isolate the flowmeter.
Operating in a different way may involve water hammers that can damage the meter reading
or generate instabilities.
REMARK: For gas applications at a pressure higher than the atmospheric pressure, it is
recommended to use the M21 models without valve and install a separate valve at the outlet
of the flowmeter.
M21-H... models do not allow their own valve to be mounted at the outlet, they are only
available with valve at the inlet.
5.2 Gas damping mechanism
M21 ¼” damping mechanism M21 ½” and ¾” damping mechanism
BSP connection
BSP connection
NPT connection
NPT connection
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1
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