Omega Engineering FTB100 Series Manuale utente

FTB100 and FTB200 Series

Liquid Turbine Flowmeters

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford, CT 06907-0047

Toll-Free: 1-800-826-6342 Tel: (203) 359-1660

FAX: (203) 359-7700 e-mail: [email protected]

Canada: 976 Bergar

Laval (Quebec), H7L 5A1 Canada

Toll-Free: 1-800-826-6342 TEL: (514) 856-6928

FAX: (514) 856-6886 e-mail: [email protected]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA®

Customer Service: 1-800-622-2378/1-800-622-BEST®

Engineering Service: 1-800-872-9436/1-800-USA-WHEN®

Mexico En Español: 001 (203) 359-7803 FAX: 001 (203) 359-7807

Latin America [email protected] e-mail: [email protected]

Servicing Europe:

Benelux: Managed by the United Kingdom Office

Toll-Free: 0800 099 3344 TEL: +31 20 347 21 21

FAX: +31 20 643 46 43 e-mail: [email protected]

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic

Toll-Free: 0800-1-66342 TEL: +420-59-6311899

FAX: +420-59-6311114 e-mail: [email protected]

France: Managed by the United Kingdom Office

Toll-Free: 0800 466 342 TEL: +33 (0) 161 37 29 00

FAX: +33 (0) 130 57 54 27 e-mail: [email protected]

Germany/Austria: Daimlerstrasse 26

D-75392 Deckenpfronn, Germany

Toll-Free: 0800 6397678 TEL: +49 (0) 7056 9398-0

FAX: +49 (0) 7056 9398-29 e-mail: [email protected]

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified One Omega Drive, River Bend Technology Centre, Northbank

Irlam, Manchester M44 5BD United Kingdom

Toll-Free: 0800-488-488 TEL: +44 (0) 161 777-6611

FAX: +44 (0) 161 777-6622 e-mail: [email protected]

OMEGAnet®Online Service Internet e-mail

omega.com [email protected]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI

regulations that apply. OMEGA is constantly pursuing certification of its products to the European New

Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any

errors it contains, and reserves the right to alter specifications without notice.

WARNING: These products are not designed for use in, and should not be used for, human applications.

-1-

CONTENTS

1. Introduction --------------------------------------------------------------- 2

2. Specifications (Liquid Turbine) --------------------------------------- 3

3. Model Number------------------------------------------------------------ 4

4. Principal of Operation--------------------------------------------------- 5

Material Selection and Construction ---------------------------------- 6

Flowmeter Calibrations ------------------------------------------------- 6

5. Installation----------------------------------------------------------------- 7

6. Maintenance and Troubleshooting-----------------------------------10

Pickup Coil Testing----------------------------------------------------- 10

Bearing Testing --------------------------------------------------------- 10

Bearing Replacement--------------------------------------------------- 12

-2-

1. Introduction

The following information is provided for the proper installation and

maintenance of your instrument.

-3-

2. Specifications

Over-range: 150% of maximum flow (intermittently)

Turn Down Range: 10:1

Linearity: ±0.5% of reading typical

Repeatability: ±0.1% of reading over repeatable range

Temperature Range: -268 to 232°C (-450 to 450°F)

End Fittings: Standard: NPT

Optional: MS flared and flanged styles

Bearing Styles: Self lubricating, ceramic hybrid ball bearings

Materials: 316/316L dual rated stainless steel with

17.4 pH rotor.

Consult OMEGA Flow Engineering

for other available materials.

-4-

3. Model Number

-5-

4. Principal of Operation

The turbine flow sensor consists of a rotor assembly which is supported

on a shaft held in place by triple tube clusters and secured with locking

nuts within the flowmeter housing.

The rotor is free to spin on a self lubricated ceramic ball bearing. A

magnetic type pickup coil is attached on the exterior of the flowmeter

housing.

A low mass rotor design allows for rapid dynamic response. The

deflector cones eliminate downstream thrust on the rotor and allows for

dynamic positioning of the rotor between deflector cones.

The dynamic positioning of the low mass rotor provides wider

rangeability and longer bearing life than that of conventional turbine

flowmeters. Integral flow straightening tubes minimize the effects of

upstream flow turbulence.

As the liquid flows through the flowmeter the rotor spins at rate

proportional to the volumetric liquid flowrate.

Each rotor blade passing through the pickup coil generates an electrical

pulse. The frequency of the pulses is proportional to flowrate. The

summation of pulses represents total amount of liquid volume passed

through the meter.

Pickup Coil

Riser

(Threaded)

Rotor

Deflector Cones

Flow

Straightene

-6-

The number of pulses generated per unit of volume is called the

calibration factor or K-Factor. This calibration factor is used to

calculate flowrate and total amount of flow.

Material Selection and Construction

The housing is made of 316 stainless steel. The rotor is made of 17.4

pH stainless steel. Bearings are shielded, ceramic hybrid ball bearings

and are made of 440C stainless steel. Bearings are self lubricating type

and do not require any external lubrication.

Flowmeter Calibrations

The standard calibration provided with an Omega turbine flowmeter

consists of a 10-point water calibration that is traceable to NIST. Based

on this water calibration, we derive an average k-factor for water for

the flowmeter

The uncertainty of this calibration is typically 0.1%.

The K-factor on turbine flowmeters used on liquid service is NOT

density dependent.

-7-

5. Installation

Inspect all packages for any indications of damage which may have

occurred during shipment.

Verify that all meter parts or auxiliary components have arrived with

the shipment. Refer to the packing list/invoice for a detailed list of

items included in the shipment.

The flowmeter may be installed horizontally or vertically for liquid

service without affecting the meter calibration.

It is required to install meter with a minimum straight run of pipe

approximately 10 pipe diameters ahead of the inlet and 5 pipe

diameters following the outlet.

The meter housing is marked by a flow direction arrow and the inlet is

marked ‘IN’ and the outlet is marked ‘OUT’. The meter must be

installed in the piping in the correct orientation to ensure the most

accurate operation.

Install meter with adequate distance and isolation from electric motors,

transformers, welding equipment and solenoids to avoid any

electromagnetic interference from ambient electrical field.

-8-

A typical flowmeter installation is shown below:

Figure 1: Typical Flowmeter Installation

Blocking and Bypass valves should be installed if it is necessary to do

preventive maintenance on the flowmeter without shutting down the

flow system. The Bypass valve can be opened before the Blocking

valves allowing the flow to continue while removing the turbine

flowmeter for service.

IMPORTANT: All flow lines should be purged prior to installing the

meter. To prevent possible damage to the meter, install the

meter ONLY in flow lines that are clean and free of debris.

Upon initial start-up of the system a spool piece should be installed in

place of the flowmeter so that purging of the system can be performed

to remove all particle debris which could cause damage to the meter

internals.

CAUTION: Avoid over-spinning the meter. Over-spinning the meter

may cause damage to the meter internals and lead to

needless meter failure.

BYPASS RUN

Turbine FlowmeterStrainer

Blocking ValveBlocking Valve

Flow Straighener

Bypass Valve

METER RUN

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