Eletta S2 User manual

5041D2E18

Eletta

Flow Monitor

Installation

and

Operations

Manual

Models

S2, S25, S02 and

S05

5041D2E18

Please note that this manual is available as a PDF-file

on our website www.eletta.com along with other information such as

technical leaflets and application reports.

This gives you the option either to print out the desired

publications or watch it on the screen. Of course this also

enables you to benefit from the use of modern software.

For instance you can adjust the size of the image

to suit your specific need.

Notice of Proprietary Rights

This manual contains confidential technical data, including trade secrets and proprietary

information, which is the property of Eletta Flow AB, Sweden.

These data are disclosed to you under the permission that you use it with limits within your

company only, not including manufacture or processing uses.

Any other use is strictly prohibited without prior written permission from Eletta Flow AB,

Sweden.

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Customer Service

Our Customer Service Center is available to answer any of your commercial

or technical questions at our normal office hours, 8.00 to 16.30 C.E.T. (8 a.m.

to 4:30 p.m. Central European Time) The switchboard is manned 7.00 to

19.00 (7 a.m. to 7 p.m. C.E.T.) Before and after normal office hours on

Monday to Friday, you can leave a message to the person at the switchboard

and our Customer Service staff will contact you later. Questions and inquiries

will be dealt with immediately over the phone or through fax and e-mail. The

above hours are not valid at National Holidays and annual plant close down,

such as Christmas and summer holidays.

Eletta has an International Network of Authorized Distributors, who are able

to give you both technical and commercial assistance with our Products.

Please refer to Section 7 for your nearest Distributor or contact Eletta Flow in

Sweden, if no representative is to be found in your area/country.

As we have tried to write this manual as carefully and comprehensive as pos-

sible from the beginning, we understand that you can still run into problems,

which are not clearly described in this manual. In the unlikely event of such an

incident, we kindly ask you to make sure that you go trough the manual care-

fully, before contacting our Distributors or Eletta AB in Sweden. This is to

save valuable time for any of us involved in the Eletta Products, as it is some-

times easy to overlook a specific sentence in the manual. If you after doing

this still are not able to solve the problem, our Customer Service staff, at the

below numbers and addresses, are more than happy to help you.

You will also find useful information about our Products and organization on

our homepage, which you can find at the address below.

This is how you can reach us:

Via Phone: +46 8 603 07 80 (Orders & Inquiries)

+46 8 603 07 70 (Switchboard)

Distributors: See www.eletta.com

Via Mail:

Via e-mail:

Website:

Eletta Flow AB

P.O.Box 5084

SE-141 05 Kungens Kurva, SWEDEN

inf[email protected]

www.eletta.com

Our Customer Service Center is available to answer any of your commercial or

technical questions at our normal ofce hours, 8.00 to 16.30 C.E.T. (8 a.m.to

4:30 p.m. Central European Time) The switchboard is manned 7.00 to 19.00 (7

a.m. to 7 p.m. C.E.T.) Before and after normal ofce hours on Monday to Fri-

day, you can leave a message to the person at the switchboard and our Customer

Service staff will contact you later. Questions and inquiries will be dealt with

immediately over the phone or through fax and e-mail. The above hours are not

valid at National Holidays or other occations when production is closed.

Eletta has an International Network of Authorized Distributors, who are able

to give you both technical and commercial assistance with our Products. Visit

www.eletta.com for contact details.

Even though we have tried to write this manual as carefully and comprehen-

sive as possible from the beginning, we understand that you can still run into

problems, which are not clearly described in this manual. In the unlikely event

of such an incident, we kindly ask you to make sure that you go through the

manual carefully, before contacting our Distributors or Eletta AB in Sweden.

This to save valuable time for any of us involved in the Eletta Products, as it is

sometimes easy to overlook a specic sentence in the manual. If you after doing

this still are not able to solve the problem, our Customer Service staff, at the be-

low numbers and addresses, are more than happy to help you. You will also nd

useful information about our Products and organization on our homepage, which

you can nd at the address below.

5041D2E18

General Information .......................................................................... 5

1.1 Description............................................................................... 5

1.2 Speciﬁcations .......................................................................... 6

Installation........................................................................................ 10

2.1 Unpacking.............................................................................. 10

2.2 Procedures before Installation ............................................... 10

2.3 Installation of the Pipe Section ............................................. 11

2.4 Separate mounting of the Pipe Section and Control Unit ..... 12

2.5 Installation and changing the Control Unit ............................ 14

2.6 Pressure Drop ........................................................................ 16

2.7 Electrical Installation .............................................................. 18

Operation ......................................................................................... 19

3.1 Principle of operation, DP-Flow Measurement...................... 19

3.2 Change of Flow Range ......................................................... 19

3.3 Adjustment of switch point, S2 and S25 ............................... 21

3.4 Change of Flow Direction ...................................................... 22

3.4.1 Flow Direction Selector (from January 2013)......................... 22

3.4.2 Flow Direction Selector (until December 2012) ..................... 23

3.5 Change of Dial Orientation..................................................... 24

Trouble shooting.............................................................................. 25

4.1 Veriﬁcation of Flow................................................................. 25

4.2 Electrical connections............................................................ 26

4.3 Spares.................................................................................... 27

Distributors ...................................................................................... 28

Tables ............................................................................................... 29

6.1 Measuring Ranges ................................................................. 29

6.2 Weight and Dimensions ......................................................... 30

Spare Parts ...................................................................................... 31

7.1 Exploded Drawing S-GL/FA................................................... 32

7.2 Exploded Drawing S-GSS/FSS ............................................. 34

Contents

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General Information

Description

The Eletta Flow Monitor is used to control and measure flow of liquids and

gases in pipes from size 15 mm to 500 mm (larger pipes as an option). They

have been manufactured for over 65 years and are well known for its reliabili-

ty. They are used where operational safety demands, efficient supervision and

rugged installation is needed, all over the world. Eletta Flow AB in Sweden is

certified according to ISO9001 and ISO14001.

The Eletta Flow Monitor is based on the proven and dependable differential

pressure principle, using interchangeable orifice plates for different measu-

ring ranges. The Flow Monitors are working with two different differential

pressure ranges, i.e. 50 – 200 mbar for the S2/S02 and 22 – 550 mbar for the

S25/S05, depending on the desired and ordered flow range. The same goes for

our models; V1 and V15, D2 and D5 and R2 and R5. Due to the working prin-

ciple of the instrument, it is of outmost importance that the installation instruc-

tions (chapter 2) are followed carefully in order to get the proper function of

the instrument.

The Eletta Flow Monitor models S2/S02 and S25/S05 will give you an accu-

racy of +/–5% F.S. (Full Scale) if installed in the right way. (See chapter 1.2

“Specifications”, for complete information)

The Instrument consists of two parts mainly i.e. the Pipe Section and the

Control Unit. The Pipe Section is the part that is to be mounted in the process

pipe and the Control Unit is mounted directly (standard) or remote on/to the

Pipe Section. The Control Unit is giving you the Flow information and also

contains all electrical connections for input and output.

The Pipe Sections are available in different process connections with the fol-

lowing standards;

Threaded connections in BSP or NPT from 15 mm (1/2”) to 40 mm (1 1/2”)

depending on the chosen material of construction.

Flanged (wafer) connection from DN15 /PN16 (ANSI 1/2”/150 lbs) to DN

500/PN16 (ANSI 20”/150lbs ) depending on the chosen material of construc-

tion. The DIN-standard flanged units are colored blue, the ANSI-standard

units are colored green (>50 mm < 100 mm) for easy recognition in the field.

The Control Units S02 and S05 have a local readout and S2 and S25 are also

1.1

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equipped with two independent adjustable alarms (micro switches) which can

be set for low and high flow alarm. The readout has a scale, which shows you

the ordered flow range with a multiplier as a standard. The standard scales

have the following designations; for S2/S02 the scale goes from the number 4

to 8(1:2 turndown). This is the value that you have to multiply the small mul-

tiplier (sticker) figure at the bottom of the scale with, in order to read the ac-

tual flow in the values you have ordered i.e. liters/min, m3/hours, USGPM.

etc. (also shown at the bottom of the scale) For the S25/S05, the scale goes

from 1to 5and hence, this is the value you use together with the multiplier at

the bottom of the scale, to read the actual Flow through the Monitor.

The Control Unit can also be fitted with a special ordered scale (direct reading

scales) as an option, for example; l/min, m3/h, USG/min etc. for easy reading

and then you have no multiplier at the bottom of the scale.

Specifications

The only flow difference between the S2/S02 and S25/S05 is the turn down of

the flow range i.e. the S2/S02 has a 1:2 turn down (for example; 50 –100

l/min) and the S25/S05 has a turn down of 1:5 (for example; 20 – 100 l/min).

Accuracy: <+/–5% F.S (full scale) within 20-80 % of the chosen Flow range

<+/–10% F.S.(full scale) within 100% of the chosen Flow range

The accuracy stated is achievable if the installation instruction

is followed given in this manual. It is recommended that you

always choose the Flow Range of the Flow Monitor so that the

normal flow is in the middle of the Monitor Flow Range.

Make sure that the expected alarm set points are within the

chosen flow range. For example: If you have a flow of 110

l/min maximum and the normal Flow is at 90 l/min, chose the

Eletta Flow Monitor S2 with a Flow Range of 60–120 l/min.

This will give you the highest accuracy since your flow is in

the middle of the Monitor Flow Range and give you a lower

pressure loss.

Repeatability: < 2 %

Pressure: Max:16 bar, (232 PSI), higher test pressure as an option.

Min: A line pressure of apx.: 0,7 – 1,0 bar (10 – 14,5 PSI) is

required for proper operation.

Temperature: Control Unit

–20°C to 90°C (–4°F to 200°F), standard

1.2

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–20°C to 120°C ( –4°F to 250°F), optional

The lower temperature is not valid for Monitors equipped with

FPM soft parts. FPM is limited to –5 °C (23 °F).

Higher process temperature with remote installation of

Control Unit (separate mounting, see section 2.4)

These temperature limits are valid for models S2 and S25

(with micro switches)

Temperature limit for S02 and S05 is –20°C to 120°C (–4°F to

250°F). Pls note the FPM soft part remark above, which is

valid also for S02/S05 models.

Pipe Section: The pipe sections are equipped with spacers (holding the orifi-

ce plate) made of Polyamide plastic (PA) material and they can

handle liquid/gas temperature up to 150 °C (300°F).

For higher process temperature, we recommend to use the sta-

inless steel pipe section, which has no spacers.

Dial: 120 mm diameter with mechanical pointer and a linear scale.

Front glass: Acrylic

Process

connection: DN15 – 40 (1/2” – 11/2”) for GL-models

DN15 – 25 (1/2” – 1”) for GSS -models

DN15 – 400 (1/2” – 16”) for FA-models

DN15 – 500 (1/2” – 20”) for FSS-models

Alarm/

Contacts: S2 and S25 have 2 (two) micro switch SPDT contacts, inde-

pendently adjustable within the ordered Flow range.

S02 and S05 has no micro switch contacts included; only a

dial for local indication of Flow.

Micro

switch spec: Contact surfaces are silver plated as standard.

Hystereses: +/–10%

Voltage: max. 460 VAC

Current: max.15 A

Inductive load: 15A @ 380 VAC

0,03A @ 230 VAC

5A @ 30 VDC

Type: SPDT

Contact surfaces are silver plated as standard.

Hystereses: 10%

Rated voltage: 480 VAC/15A

Breaking current: 15@125, 250, 480 VAC

Resistive load: 2A@30 VDC

0,4A@125 VDC

0,2A@230 VDC

Type: SPDT

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For intrinsically safe (IS) applications, we recommend to order

micro switches with gold plated contact surface, which are

better suited for the voltage and current limitations in the Ex-

regulations.

Protection

Class: As an option, hermetically sealed micro switches are available (1HM1)

Control Unit: IP43 (NEMA 3R), standard

IP65 (NEMA 4x), optional

Aluminum alloy, alodine and epoxy polyester coated. 3 cable

glands included (PG16/PR22,5)

Material; Pipe Section

and Diaphragm

Housing: Type GL; SM 2862 (B.S CZ132) de-zincificated – copper

alloy.

Option: Nickel-plating by means of the Canigen process

(90% Nickel and 10% Phosphorus and the thick-

ness is 25 micron)

Type GSS; seaworthy stainless steel SS 2564 (SS 316),

Type FA; <DN50 (ANSI 2”); copper alloy

>DN50 (ANSI 2”); cast iron, epoxy polyester

coated.

Type FSS; stainless steel SS2343 (SS316)

Material

diaphragm: Textile reinforced Hydrated Nitrile rubber (HNBR), standard

on all models except stainless steel.

Textile reinforced EPDM rubber, optional for all models

Textile reinforced Fluorinated rubber, FPM, standard in stain-

less steel models, optional for others.

Material, O-rings

and other

soft parts: Follows the Diaphragm materials.

Spacer: The spacer holds the orifice plate inside the pipes section and

they are made of Polyamide plastic (PA) as a standard. Max.li-

quid/gas temperature is 150°C (300°F).

Intrinsically Safe

(Ex i): The Eletta Flow Monitor contains only SPDT

Material; Diaphragm housing and pipe section:

Type GL: De-zincicated brass, CW602N, EN12420

Type GSS: Seaworthy stainless steel 1.4470

Type FA: Housing: De-zincicated brass, CW602N, EN12420

Pipe section: <DN40 (ANSI 1 1/2”) Bronze CC491K / EN1982

>DN40 (ANSI 1 1/2”) Painted cast iron, GG25 / DIN1691

Type FSS: Housing: Seaworthy stainless steel 1.4470

Pipe section: Stainless steel 1.4435

5041A2E4

For intrinsically safe (IS) applications, we recommend to order

micro switches with gold plated contact surface, which are

better suited for the voltage and current limitations in the Ex-

regulations.

Protection

Class: As an option, hermetically sealed micro switches are available (1HM1)

Control Unit: IP43 (NEMA 3R), standard

IP65 (NEMA 4x), optional

Aluminum alloy, alodine and epoxy polyester coated. 3 cable

glands included (PG16/PR22,5)

Material; Pipe Section

and Diaphragm

Housing: Type GL; SM 2862 (B.S CZ132) de-zincificated – copper

alloy.

Option: Nickel-plating by means of the Canigen process

(90% Nickel and 10% Phosphorus and the thick-

ness is 25 micron)

Type GSS; seaworthy stainless steel SS 2564 (SS 316),

Type FA; <DN50 (ANSI 2”); copper alloy

>DN50 (ANSI 2”); cast iron, epoxy polyester

coated.

Type FSS; stainless steel SS2343 (SS316)

Material

diaphragm: Textile reinforced Hydrated Nitrile rubber (HNBR), standard

on all models except stainless steel.

Textile reinforced EPDM rubber, optional for all models

Textile reinforced Fluorinated rubber, FPM, standard in stain-

less steel models, optional for others.

Material, O-rings

and other

soft parts: Follows the Diaphragm materials.

Spacer: The spacer holds the orifice plate inside the pipes section and

they are made of Polyamide plastic (PA) as a standard. Max.li-

quid/gas temperature is 150°C (300°F).

Intrinsically Safe

(Ex i): The Eletta Flow Monitor contains only SPDT

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contacts (micro switches), which are considered “passive

components” (simple apparatus) and are therefore possible to

use in an intrinsically safe circuit where you feed the micro

switch contacts through an approved pulse isolator (not in-

cluded).

Explosion

Proof: The Flow Monitor itself is not approved as a complete instru-

ment according to EU Hazardous Area EX-regulations.

CE-

approvals: The Eletta Flow Monitors conforms with the EU directive for

low voltage no: 72/23/EEC ( EN 60 204-1, Part 1.) We refer to

the certificates issued, which will be sent to you upon request.

They are also available at www.eletta.com.

PED-

Directive: Complies with applicable parts in Pressure Equipment

Directive 97/23/EC Module A1. Eletta approved by notified

body Det Norske Veritas with approval number: 0409.

The certificates issued, which will be sent to you upon request

or they can also be found to download on www.eletta.com.

Approvals: The micro switches, cables and terminal blocks are approved

according to CSA.

5041A2E4

contacts (micro switches), which are considered “passive

components” (simple apparatus) and are therefore possible to

use in an intrinsically safe circuit where you feed the micro

switch contacts through an approved pulse isolator (not in-

cluded).

Explosion

Proof: The Flow Monitor itself is not approved as a complete instru-

ment according to EU Hazardous Area EX-regulations.

CE-

approvals: The Eletta Flow Monitors conforms with the EU directive for

low voltage no: 72/23/EEC ( EN 60 204-1, Part 1.) We refer to

the certificates issued, which will be sent to you upon request.

They are also available at www.eletta.com.

PED-

Directive: Complies with applicable parts in Pressure Equipment

Directive 97/23/EC Module A1. Eletta approved by notified

body Det Norske Veritas with approval number: 0409.

The certificates issued, which will be sent to you upon request

or they can also be found to download on www.eletta.com.

Approvals: The micro switches, cables and terminal blocks are approved

according to CSA.

5041A2E4

contacts (micro switches), which are considered “passive

components” (simple apparatus) and are therefore possible to

use in an intrinsically safe circuit where you feed the micro

switch contacts through an approved pulse isolator (not in-

cluded).

Explosion

Proof: The Flow Monitor itself is not approved as a complete instru-

ment according to EU Hazardous Area EX-regulations.

CE-

approvals: The Eletta Flow Monitors conforms with the EU directive for

low voltage no: 72/23/EEC ( EN 60 204-1, Part 1.) We refer to

the certificates issued, which will be sent to you upon request.

They are also available at www.eletta.com.

PED-

Directive: Complies with applicable parts in Pressure Equipment

Directive 97/23/EC Module A1. Eletta approved by notified

body Det Norske Veritas with approval number: 0409.

The certificates issued, which will be sent to you upon request

or they can also be found to download on www.eletta.com.

Approvals: The micro switches, cables and terminal blocks are approved

according to CSA.

Complies with applicable parts in Pressure Equipment Directive

97/23/EC. Conformity assessment has been performed accor-

ding to module A. Internal production control combined with

module A1. Internal manufacturing checks with monitoring

of the nal assessment, for category 2. Performed by Inspecta

AB, Notied body No. 0409. PED Declaration of conformity

will be sent to you upon request and are also available on

www.eletta.com.

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Installation

Unpacking

We appreciate that you have decided to purchase our Products and we would

like to ask you to begin the installation by checking your delivery against the

Packing List. Please make sure to check the box for external damages before

opening. If you find external damages, which have also led to damages to the

Flow Monitor inside, you should contact the forwarder/shipper to claim repla-

cement (or the cost of replacement). Check the Monitors’ identification tag

against your purchase order to make sure you have got the right parts with

the right specifications.

All Monitors are individually packed in plastic bags and put into the box eith-

er two by two or individually in each box. The plastic bag is to prevent foreign

particles to get inside the Pipe Section, which could prevent proper function of

the Flow Monitor after the installation.

The box is made from recycled environmental friendly material and we kindly

ask you to deal with the waste material in a way that will have as little impact

on the environment as possible.

Procedures before Installation

Note!!! Before any installation or maintenance work, disconnect all

electrical power!

Please check that you are going to mount the Monitor at the lowest point in the

piping system if you are measuring liquids and at the highest point if you are

measuring gases. Also check if the planned flow direction in the system mat-

ches the one indicated on the Monitor. There is a red flow direction arrow on

the outside of the pipe section (not the Stainless Steelmodels which have a

marking engraved on the side). If you find this to mismatch, we refer to sec-

tion 3.4 ”Change of Flow Direction”, to adjust the internal flow director in or-

der to match the desired flow direction. Change of the flow direction on the

Stainless Steel Pipe Sections (FSS/GSS) is not possible in the field without

ordering a new Pipe Section and we kindly ask you to contact your local re-

presentative or Eletta Flow AB, Sweden for help.

Check that the pipe section has the right threads or the right flange standard to

match your piping or counter flange.

If you are using the separate/remote execution i.e. Pipe Section and Control

Unit installed in different locations, please check the plastic hoses for any da-

2.1

2.2

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mages or holes that can prevent proper function. The plastic hoses should not

be used in temperatures over 90ºC (194 ºF). If your application temperature

exceeds this temperature/pressure, we recommend to use copper or stainless

steel tubing, depending on the compatibility to the measured gas or liquid (see

section 2.4)

Installation of the Pipe Section

Note!!! Before starting to install the Pipe Section, please make sure

that the piping is not under pressure from flow of liquid/gas!

The pipe section can be installed in any desired direction, vertically or hori-

zontally or angular and the direction arrow on the pipe section denote the di-

rection of the flow. It is very important that the pipe section is mounted with

the correct direction, as the function of the Flow Monitor otherwise will be

prevented. The piping shall be rigid and free from vibrations and hoses con-

nected directly into the Monitors should be avoided as much as possible. If

you have weak piping we advise you to use the M6 mounting holes (only on

GL - series) on the backside of the pipe section, to fasten the pipe section to a

wall or a rigid bracket. The straight runs before and after the Monitor should

not be too short, in order to avoid disturbances, which can cause the Monitor

to show incorrect values. We recommend giving at least 10 - 15 diameters up-

stream and 5 diameters downstream. (Please see Fig. 1)

The reasons for this procedure is to achieve a stable flow profile inside the

pipe and by doing so, get a true reading. Please be aware of the fact that it is

practically impossible to predict when the flow is stable after disturbances in

the piping, so this must serve as a guideline only. The straight runs must be

2.3

Recommended installation of Pipe Section

Figure 1

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free from valves, bends or in/decreasing diameters. Any of these disturbances

must be placed before and preferably after you start counting the straight

runs.

If you are installing the threaded versions, GL and GSS-versions, please

make sure that you are not using so called ”tube fittings”. We have often

seen them to have a much smaller inside diameter than the pipe section,

even though the size of the thread match. This can create a jet stream of the

fluid/gas, which will cause the differential pressure to be too low and you

will not get a good or accurate reading.

The following inside diameters apply for the threaded Pipe Sections:

GL-and GSS 15 = 16 mm

GL-and GSS 20 = 21 mm

GL-and GSS 25 = 26 mm

GL-40 = 41 mm

Make sure that the Control unit, if mounted directly on the Pipe Section, is

placed on top of the Pipe Section and not under to prevent particles in the flu-

id to collect in the diaphragm housing. Please use a filter in the pipeline if you

suspect the fluid to contain particles.

The flanged models, FA and FSS-versions, must be aligned with the counter

flange and not placed in stress by tightening the bolts uneven. The flanged

models come with a gasket and we recommend using this, as it is dimensioned

to suit the installation. Please see to that the gasket is properly aligned and not

disturbing the flow. It is also of outmost importance that the connecting pipe

and flange is of the same diameter (inside) and standard as the pipe section. A

mismatch can cause an erratic or incorrect reading of the flow. If needed, ple-

ase support the Flow Monitors with rigid brackets. There is no problem in at-

taching the brackets directly to the Flow Monitor (see above), but we recom-

mend mounting them in the pipeline downstream and upstream to avoid unne-

cessary stress in the installation area.

Separate mounting of the Pipe Section and

the Control Unit

Sometimes separate mounting of the Pipe Section and the Control Unit is re-

quested due to vibrations, high temperature or lack of space. As the Eletta

Flow Monitor is using the differential pressure caused by the orifice plate

mounted in the pipeline and directs these two pressures via two individual

2.4

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ports up to the Control Unit, it is also possible to separate the Monitor (Fig.

2) from the Pipe Section -GL/FA into two parts. The pressure is then lead

through either plastic hoses or metallic tubing depending on the liquid,

pressure and temperature.

As a standard, we supply 2x1,75 meter (5.74 feet) of PA plastic, Ø 6 mm (0,23

inch) hoses capable of handling 90ºC (194°F) and 16 bar (232 PSI), together

with two specially made adapters to be mounted on the Pipe Section and

Control Unit respectively. If your application requires metallic tubing (copper

or stainless steel) it has to be provided locally. If you are measuring a chemi-

cal liquid or gas, check with the supplier which material you should use in

your tubing. Please make sure to use only 6 mm tubing in order to suit the tube

fittings included in the delivery. There is no actual limitation in the length of

the hoses or tubing, but we recommend placing the units as close as possible

to each other, as this will help in troubleshooting and on-site calibration.

Note!!! The hoses/tubings must have the same length to avoid uneven pres-

sure. If you mount valves (not included in delivery) in the pressure hoses/tu-

bing, it will help you to easily shut them off and remove/exchange the

Control Unit at full process pressure.

The Mounting of three-way/five-way standard valve (not included in delivery)

will allow you to discharge any entrapped air/gas or condense and also provi-

de the possibility to even out the pressure between the plus and minus leg for

zero verification. Please follow the above ”Installation of the Pipe Section” af-

ter you have mounted the adapter on to the Pipe Section. As you will use ho-

ses/tubing to lead the pressure up to the Control Unit, it is possible to mount

the Pipe Section in any direction, vertically or horizontally and with the pres-

sure ports pointing up, down or to the side (pls. see section 2.3).

Separate mounting of Pipe Section and Control Unit GL/FA

Figure 2

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Find a suitable place for the Control Unit to be mounted. Use the supplied

bracket to attach it to a wall, pipe or another steady and rigid support. To take

advantage of the large and clear dial, the Control Unit should be clearly visi-

ble from a distance and easy accessible for maintenance if needed. Please plan

this with respect to later mounted piping or other obstacles. Install the

hoses/tubing, commencing with the Pipe Section. Check that you have enough

length to cover the distance between the Pipe Section and Control Unit. The

Pipe Section adapter has a (+) and (–) marking engraved and the adapter on

the Control unit too. Please make sure to match (+) to (+) and (–) to (–) on the

adapters. Press the hose/tube end into the coupling and tighten with care.

Proceed to the Control Unit and repeat the above. When you fill up the system

for the first time with liquid, please make sure that all entrapped air in the pi-

ping between the Pipe Section and Control Unit is removed. The air can other

wise, as it is a compressible media, cause faulty flow readings.

Installation and changing of the Control Unit

As all Eletta Flow Monitors are designed in sections to achieve a modular and

versatile Flow Monitor, there is a possibility to upgrade/rebuild them and ad-

ding other features to your already installed Monitor, by changing the Control

Unit or Pipe Section. If you, for example, would like to upgrade a V- or S-se-

ries with mechanical micro switches to a D-series including analog and/or

frequency output, local front display and two independent adjustable relays or

the other way around, this is easily done. You simply order a Control Unit with

the flow

Purge valve

Pipe

fitting

Adapter for Control unit

Adapter for pipe section

Hose/

Tubing

Figure 3

2.5

Separate mounting of Pipe Section and Control Unit GSS/FSS

the ow range you need, to get the right dial with the right multiplier or direct

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range you need, to get the right dial with the right multiplier or direct reading

scale. When you order, you will get the Control Unit with the diaphragm hou-

sing included. Make sure you order the right material in the diaphragm hou-

sing and the soft rubber parts (diaphragm, o-rings and diaphragm lever) and

you will get the Control Unit already tested and calibrated and ready to fit

onto the Pipe Section, without any on-site adjustments or calibration. All

Eletta DP Flow Monitors are working with the same differential pressure wit-

hin their specific range (Pls. see section 1.1).

If you have a Pipe Section designated; -GL or GSS (-FSS), start with ma-

king sure that there is no pressure in the system, as these Pipe Sections do

not have any internal shut-off valves for isolating them from process pressure.

Turn the electric power supply off and then disconnect the cables from the

micro switch electric terminal. If you have a Pipe Section designated; -FA you

will find the included shut-off valves under the brass elbow, which connects

the Control Unit to the Pipe Section.

Turn them counter-wise until you feel the end position and this shuts off the

pressure up to the Control Unit and you can easily remove this. If you have a

Pipe Section designated; -FSS, there is an option to buy this with a shut-off

manifold, but it will not come as a standard.

On the -GL Pipe Section; loosen the four (4) hexagon screws that hold the

diaphragm housing (do not remove the blue housing at any time) to the Pipe

Section. Replace the flow direction selector (3.4.1 and 3.4.2) if damaged, or

if other material is required. Install the new Control Unit and tighten the four

(4) hexagon screws firmly again.

On the -GSS Pipe Section; loosen the two (2) hexagon screws that hold the

diaphragm housing and replace the O-rings to the right material, if necessary.

Install the new Control Unit and tighten the two (2) screws firmly again.

On the -FA Pipe Section:

untighten the four (4) screws which hold the diaphragm housing.

Replace the flow direction selector (3.4.1 and 3.4.2) if damaged, or if other

material is required to the pipe section. Install the new Control Unit and

tighten the four (4) screws firmly again.

On the -FSS Pipe Section; If you have a Monitor that has a shut-off manifold,

you can close the two (2) valves to get the diaphragm housing non-pressuri-

zed. Otherwise, start with checking that there is no pressure in the pipe system

and up to the diaphragm housing. Loosen the two screws that hold the dia-

phragm housing and replace the O-rings to the right material, if necessary.

As an option we have a manifold with shut-off valves, this enables you to

dismount the control unit from the pipe-section during full operation.

Start with making sure that there is no pressure in the system. Turn the

electric power supply off and then disconnect the cables from the micro switch

electric terminal.

reading scale. When you order, you will get the Control Unit with the diaphragm

housing included. Make sure you order the right material in the diaphragm hou-

sing and the soft rubber parts (diaphragm, o-rings and diaphragm lever) and you

will get the Control Unit already tested and calibrated and ready to fit onto the

Pipe Section, without any on-site adjustments or calibration. All Eletta DP Flow

Monitors are working with the same differential pressure within their specific

range (Pls. see section 1.1).

On the -FA Pipe Section: untighten the four (4) screws which hold the

diaphragm housing.Replace the ow direction selector (3.4.1 and 3.4.2) if

damaged, or if other material is required to the pipe section. Install the new

Control Unit and tighten the four (4) screws rmly again.

On the -FSS Pipe Section; Loosen the two screws that hold the diaphragm

housing and replace the O-rings to the right material, if necessary. Install the

new Control Unit and tighten the two (2) screws rmly again.

Connect the electrical cables according to your new Control Unit’s possibilities

and for detailed information regarding wiring, please see section 2.7”Electrical

installation”.

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Install the new Control Unit and tighten the two (2) screws firmly again. If a

shut-off manifold is installed; do not forget to open up the two (2) shutoff val-

ves again, in order to get a proper function of the Flow Monitor.

Connect the electrical cables according to your new Control Unit’s possibili-

ties and for detailed information regarding wiring, please see section 2.7

”Electrical installation”.

Pressure Drop

The Eletta Flow Monitor is a differential pressure measuring device and there-

fore it creates a certain pressure drop when in function. There are two different

types of Pressure Drop’s involved, actual pressure drop and permanent

pressure drop. Below we will explain the difference between these two:

When the orifice plate mounted in the Eletta Flow Monitor reduces the flow

area inside the pipe system, a pressure drop over the orifice is created. This is

what we call actual pressure drop. Please refer to chapter 1.1 ”Description”

for actual pressure drop (differential pressure span).

The calculation of the flow is using this pressure drop to calculate the actual

flow value (see calculation below). The actual pressure drop is a temporary

pressure state and the Eletta Flow Monitors are working within this differenti-

al pressure created within the Flow range of the Monitor. When the flow has

passed the Monitor, the pressure is then trying to get back to its original pres-

sure and normally after 10 - 15 times the inner diameter of the pipe, the flow

becomes linear and fully developed. This is a normalized flow but due to fric-

tion losses over our Flow Monitor, the pressure will not be able to reclaim all

the energy (pressure). This is what we call permanent pressure drop.

The permanent pressure drop can be calculated approximately by ∆ρ(ppd) =

∆ρ(apd) • (1-β2), where the symbols represent:

∆ρ(ppd) = permanent pressure drop

∆ρ(apd) = actual pressure drop (see formula below ”actual pressure

drop graph” for calculation)

β=d/D ratio (ratio between bore and inner diameter of the pipe).

This means that for the normal βrange (0.2 - 0.7) a typical permanent pres-

sure drop ranges from 0.96 ∆ρ and 0.51 ∆ρ can be expected.

Example:

For the Eletta Flow Monitor S2-GL15 with a flow range of 10 - 20 l/min, the

following example can be used for how to calculate the ∆ρ(ppd) permanent

pressure drop) at 15 l/min for the said Monitor:

2.6

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d = 10,2 mm

D = 16,0 mm

This gives β= 10,2/16,00 ⇒β = 0,6375 and (1-β2) = 0.594

Furthermore, in order to use this β−value in the above formula, we need to de-

termine the ∆ρ(apd). We can either use the ”Actual Pressure Drop Graph” (fig.

4) for an approximate value or for intermediate values we can use the formula

below the graph (fig. 4). If we use the formula for calculate the ∆ρ(apd)at 15

l/min we will get;

∆ρ(apd) = (15/20) • 200 mbar ⇒112,5 mbar

In order to finally get the permanent pressure drop, we use the above descri-

bed formula: ∆ρ(ppd) = ∆ρ(apd) • (1-β2)and put in the values we have:

∆ρ(ppd) = 112,5 • 0,594 mbar ⇒ 66,82 mbar

∆ρ(apd) =(Q/Qmax)2* 2000 mmH2O (196 mbar) for turn down ratio of 1:2

∆ρ(apd) =(Q/Qmax)2* 5500 mmH2O (539 mbar) for turn down ratio of 1:5

Q= actual flow

Qmax = maximum flow of the Flow Monitor (according to the

installed orifice plate)

The Pressure loss curves in the graph (fig. 4) must serve as a guideline.

Actual Pressure Drop Graph

Figure 4

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Electrical Installation

Note!!! An authorized professional person should make all electrical

installations.

This section is not valid for the models S02 and S05 as these are Monitors wit-

hout any micro switches installed and work without the need of electrical po-

wer. Before you connect any cables, please make sure that you have the right

power supply within the specifications (see section 1.2 “Specifications”).

All terminal block connections are to be made through the included cable

gland PR22,5/PG16 (and please note that you can have two alternative moun-

tings of the cable gland depending on what side you want to enter with the ca-

bles). If you install the Flow Monitor in an Ex-hazardous area, please make

sure to follow local installation procedures and regulations. The terminal

block connections are described in fig.5 below. A grounding screw is to be

found at the side of the terminal block.

Before any circuit is connected/disconnected, make sure that all power is

off!

2.7

Figure 5

Setting of high/low flow alarm for the S2/S25

(tool normally placed under top lid)

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Operation

Principle of operation, DP-Flow Measurement

The Eletta Flow Monitor’s function is based on the proven and dependable di-

ferential pressure principal, using interchangeable sharp-edge orifice plates

for different measuring ranges. This is perhaps the oldest and most widely

used principle for flow metering, mainly because of its simplicity, its relative-

ly low cost and high volume of research data available for predicting the Flow

Monitors behavior. In the Pipe Section, a fixed area flow restriction (the orifi-

ce plate) causes a pressure drop, which varies with the flow rate. This pressu-

re drop has a high and a low pressure, which is lead through two channels

from each side of the orifice plate, to the Control Unit. By measure the pres-

sure drop allows flow rate measurement by means of a mathematical formula.

A short form of the calculation can be described as Q=√ ∆ρ.

In most Eletta Flow Monitors, the differential pressure is sensed and measured

mechanically via a rubber diaphragm and linked to an outside of the process

liquid/gas, mechanism. This mechanism transforms the movement into a Flow

rate value shown on the dial. All the Eletta Flow Monitors are tested and ap-

proved according to the European CE-mark regulations. (Pls. contact your

Distributor or Eletta Sweden for copy of certificate or go to www.eletta.com).

Change of Flow Range

The Eletta Flow Monitor features an orifice mechanism that does not require

recalibration after replacement and can easily be rebuild in the field to

change the flow range to another from the flow rate ordered. This is valid for

all Pipe Sections except the GSS/FSS-models where you have to order a

completely new Pipe Section, as the flow selector is an integrated part of the

orifice plate. The orifice plate inside the pipe section is the only part in the li-

quid/gas that has to be changed. You can order and change any flow range that

suits your specific application, as long as the new flow rate falls within the to-

tal possible span for the actual Flow Monitor (see section 6.1 page 29).

In each case of rebuilding the flow Monitor in the field, we kindly ask you to

consult Eletta or your local Distributor for advise of the right orifice plate be-

fore ordering.

First empty the piping system so it is un-pressurized and has no flow!

3.1

3.2

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For threaded model -GL:

Untighten the bolts that hold the Pipe Section between the flanges in the pi-

ping (do not remove the threaded parts from the piping). Remove only the

number of bolts necessary to pull the Monitor from the piping, normally it ta-

kes only one bolt from the highest position, to get the Monitor out. Take out

one of the spacers that holds the orifice plate. Change the orifice plate to the

new ordered orifice plate and remember that you can install it in any direction.

Reinstall the spacer that holds the orifice in place inside the Pipe Section.

Install the Monitor in the piping system again and tighten the bolts firmly to

avoid leakage.

For threaded model –GSS:

In this model there is no loose replaceable orifice plate and therefore it is ne-

cessary to change the complete orifice section with holder, to achieve a new

flow range.

Please follow the above instructions for the –GL model for dismounting the

whole orifice plate with holder. Remove the Control Unit from the old Pipe

Section (orifice section) and install this to the new Pipe Section. Remount the

Flow Monitor into the piping system again and tighten the bolts firmly.

For flanged model FA-:

Follow the procedure above to loosen the pipe section from the counter flang-

es in the piping system, but note that the spacers are held in place with two

screws, which has to be untightened before removal

For flanged stainless steel model FSS-:

In this model there is no loose replaceable orifice plate and therefore it is ne-

cessary to change the complete Pipe Section to achieve a new flow range.

Follow the procedure above to loosen the Pipe Section from the counter flang-

es in the piping system. Remove the Control Unit from the old Pipe Section

(orifice section) and install this to the new Pipe Section. Remount the Flow

Monitor into the piping system again and tighten the bolts firmly.

Always check that no gaskets will interfere, by misaligning, with the flow

when installing the Flow Monitor.

When you change the orifice plate in order to get a new flow range, it is ne-

cessary to change the identification plate to a plate with the new range mark-

ed. This identification plate comes together with the orifice plate when you