Tecfluid VH Series User manual

Series VH
Paddle flow switch
Instructions manual
The art of measuring
R-MI-VH Rev.: 1 english version

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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,
please contact us in advance.
PREFACE
WARNINGS

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TABLE OF CONTENTS
SERIES VH
1 INTRODUCTION ........................................................................... 4
2 WORKING PRINCIPLE .................................................................. 4
3 MODELS ...................................................................................... 4
4 RECEPTION .................................................................................. 5
5 INSTALLATION ............................................................................. 5
5.1 Electrical connection ........................................................... 6
6 MAINTENANCE ............................................................................ 7
7 TECHNICAL CHARACTERISTICS .................................................. 7
8 SAFETY INSTRUCTIONS ................................................................ 8
8.1 Pressure equipment directive ............................................. 8
8.2 Certificate of conformity TR CU (EAC marking) ..................... 8
9 ADDITIONAL INSTRUCTIONS FOR THE ATEX VERSION ................. 8
9.1 Non-metallic parts .............................................................. 8
10 SWITCHING FLOW RATES ............................................................ 9
11 DIMENSIONS ............................................................................... 10

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SERIES VH
1 INTRODUCTION
The series VH are mechanical flow switches based on the displacement of a paddle by the
force of movement of a flowing liquid. This displacement becomes a detection signal.
2 WORKING PRINCIPLE
A liquid flows inside a pipe fast enough to move a paddle, which at the same time moves a
permanent magnet. This magnet acts over a bi-stable SPDT and potential free reed switch,
that changes its state. The magnet-reed switch system is isolated from the liquid.
The flow switching point is positioned between 30º and 45º from the zero position.
3 MODELS
VH35 / AISI 316L VH35 / PTFE
VH37 / AISI 316L VH37 / PTFE
VH39 / PTFE

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VH35 Horizontal pipe
VH37 vertical pipe with upwards flow, with spring
VH39 vertical pipe with upwards flow, with magnetic spring
4 RECEPTION
The series VH flow switches are supplied conveniently packaged for their protection during
transportation and storage, together with their instructions manual for installation and
operation.
5 INSTALLATION
For VH35 model, install the flow switch in a horizontal pipe with the hanging paddle in
vertical position and perpendicular to the flow direction. The center of the paddle-pin should
be aligned with the inner diameter of the pipe. To achieve this position, the top of the
threaded fitting should be at the following distances from the inner pipe diameter:
24 mm, if the switch is made of stainless steel (AISI 316L).
85 mm, if the switch is made of plastic (PTFE).
The paddle should be free to move without touching the pipe.
The flow switch will work with flow in both directions in a horizontal pipe.
NOTE: On request the flow switch can be supplied for mounting in a vertical pipe with
upwards flow direction (models VH37 and VH39). In this case the paddle has a stop to avoid
it from falling below the horizontal position, and the switching flow rate will be higher than the
version for a horizontal pipe.

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This numbering refers to the switch without flow.
Make sure that the contact rating indicated on the label at the product and in page 7 of this
manual, is not exceeded.
is not exceeded. If high loads are to be switched, use an auxiliary relay.
When using inductive loads, such as relays or solenoid valve coils, surge arresters should be
installed to protect the reed contacts.
With a DC supply, a diode should be connected as shown.
For an AC supply, a RC circuit can be used as shown, although a varistor (VDR) is better
and is easier to select the right value. The VDR should have a breakdown voltage greater
than 1.5 times the rms voltage. The standard varistor ratings specify the rms working voltage
for the varistor, for example a S05K25 varistor will be for 25 Vrms working and will have a
breakdown voltage of 39 V at 1 mA.
In the female connector:
Terminal 1: Reed contact
Terminal 2: Reed contact
Terminal 3: Not connected
Earth terminal: Earth
5.1 Electrical connection
For the electrical installation it is recommended to use multiple conductor cables, and not
single cables, in order to guarantee the cable gland will stay watertight. The connector has a
PG9 cable gland for cables with outer diameters between 4.5 mm and 7 mm. The
numbering of the terminals is the following:

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The electrical installation should provide a fuse or circuit breaker to protect the reed switch
from overloads.
When installing the connector, make sure that the cable gland (A) closes over the cable and that
the connector (B) with the rubber seal (C) is well screwed down to maintain the IP65 rating.
6 MAINTENANCE
No special maintenance is required.
7 TECHNICAL CHARACTERISTICS
Mounting: Horizontal pipe or vertical pipe with upwards flow
Fluid density: No restrictions
Working temperature: -40ºC ... +125ºC
Working pressure:
Body in AISI 316L: PN25 (others on request)
Body in PTFE: PN10
Connections: G1 (1” NPT on request)
Connector: DIN 43650 A
Electrical characteristics of the reed sensor:
Maximum switching power: 5 W
Maximum switching voltage: 120 VAC, 175 VDC
Maximum switching current: 0,18 AAC, 0,25 ADC
Hysteresis: ±5% of paddle travel
Ingress protection: IP65

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8 SAFETY INSTRUCTIONS
The series VH flowmeters are in conformity with all essential
requirements of all EC directives applicable to them:
2014/68/EU Pressure equipment directive (PED)
2014/30/EU Electromagnetic compatibility directive (EMC)
2012/19/EU Waste electric and electronic equipment (WEEE).
2011/65/EU Restriction of the use of certain hazardous
substances in electrical and electronic equipment
(ROHS).
The declarations UE of conformity can be downloaded from the section “Download” of the
Tecfluid S.A. website www.tecfluid.com
8.1 Pressure equipment directive
Devices of series VH, due to their size, are rated as Category I are not within the scope of
the directive and therefore they have not the CE mark according to pressure directive. These
devices are subject to applicable sound engineering practice (SEP).
This equipment is considered as being a pressure accessory and NOT a safety accessory as
defined in the 2014/68/EU directive, Article 2, paragraph 4.
8.2 Certificate of conformity TR CU (EAC marking)
Tecfluid S.A. have subjected the series VH of flowmeters to a
certification procedure according to the technical regulations of the
Customs Union of the Eurasian Economic Union (EEU).
This Certificate is an official document confirming the quality of production
with the standards on the territory of the Customs Union, particularly
regarding safety requirements and electromagnetic compatibility.
9 ADDITIONAL INSTRUCTIONS FOR THE ATEX VERSION
Flow switches series VH can be considered simple apparatus according to IEC 60079-11
standard, and therefore they are not marked as ATEX.
9.1 Non-metallic parts
WARNING: POTENTIAL RISK OF ELECTROSTATIC CHARGE
Since the danger of ignition by electrostatic discharge when rubbing this protection can not
be avoided, the instrument must always be cleaned with a damp cloth.

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10 SWITCHING FLOW RATES
DN
(mm)
NPS
(inches) Switching flow rate (1) (m3/h) L (mm)
32 1 ¼“ 2 26
40 1 ½“ 2,5 34
50 2“ 3 40
65 2 ½” 4 55
80 3” 5 65
100 4” 10 90
125 5” 10 115
150 6” 12 140
200 8” 25 185
250 10” 30 230
300 12” 50 280
350 14” 60 330
400 16” 80 380
450 18” 100 415
500 20” 120 450
(1) Approximate flow rate
L: Paddle length

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11 DIMENSIONS
(dimensions in mm)
Model VH35 AISI 316L

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Model VH35 PTFE
(dimensions in mm)

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WARRANTY
Tecfluid S.A. guarantee all the products for a period of 24 months from their sale, against all faulty
materials, manufacturing or performance. This warranty does not cover failures which might be
imputed to misuse, use in an application different to that specified in the order, the result of service or
modification carried out by personnel not authorized by Tecfluid S.A., wrong handling or accident.
This warranty is limited to cover the replacement or repair of the defective parts which have not
damaged due to misuse, being excluded all responsibility due to any other damage or the effects of
wear caused by the normal use of the devices.
Any consignment of devices for repair must observe a procedure which can be consulted in the
website www.tecfluid.com, “After-Sales” section.
All materials sent to our factory must be correctly packaged, clean and completely exempt of any
liquid, grease or toxic substances.
The devices sent for repair must enclose the corresponding form, which can be filled in via website
from the same “After-Sales” section.
Warranty for repaired or replaced components applies 6 months from repair or replacement date.
Anyway, the warranty period will last at least until the initial supply warranty period is over.
TRANSPORTATION
All consignments from the Buyer to the Seller´s installations for their credit, repair or replacement must
always be done at freight cost paid unless previous agreement.
The Seller will not accept any responsibility for possible damages caused on the devices during
transportation.
Tecfluid S.A.
Narcís Monturiol 33
08960 Sant Just Desvern
Barcelona
Tel: [phone]
Fax: [phone]
tecfluid@tecfluid.com
www.tecfluid.com
The technical data described in this manual is subject to modification without notification if the technical innovations in the
manufacturing processes so require.
Quality Management System ISO 9001 certified by
Pressure Equipment Directive 2014/68/UE certified by
ATEX European Directive 2014/34/EU certified by
HART is a registered trademark of Fielcomm Group TM