Kobold KFF Manuel utilisateur

KFF/KFG Low-Volume Flow Meter

User Instructions

KFG_KFF_manual_0304

622 Mary Street; Suite 101; Warminster, PA 18974

Phone: 267-673-8117 - Fax: 267-673-8118

Sa[email protected] - www.cabriggs.com

1. General Information

Please read this service manual carefully before unpacking and readying the unit for

operation, and follow the instructions precisely as described herein. These devices may

only be installed, used and maintained by skilled personnel who are familiar with this

service manual and can observe applicable regulations regarding industrial safety and

accident prevention.

2. Contents

1. General Information .......................................Page 2

2. Contents ...............................................Page 2

3. Suggested Application ..................................Page 3

4. Operating Principle .....................................Page 3

5. Unit Check-up ..........................................Page 4

6. Mechanical Connection .................................Page 4

7. Electrical Connection ...................................Page 5

8. Electrical Commissioning ...............................Page 6

9. Mechanical Commissioning .............................Page 6

10. Technical Data ..........................................Page 7

11. Dimensions .............................................Page 8

Manufactured and Marketed by:

Kobold Instruments Inc.

1801 Parkway View Drive

Pittsburgh, PA 15205

Tel: 412-788-2830

Fax: 412-788-4890

KFF, KFG

Page 203/04

3. Suggested Application

The KFF and KFG seriesflow meters are used for measuring small liquid or gas flows.

These units are configured as follows:

Analog output

In order to transmit the measured flow results, ananalog output (0-5 V) is provided.

A 500 Hz. max. pulse output is available on some models.

Flow sensor with analog output

Integrated sensor with LCD digital display (3-digit)

The KFF meters may only be used for measurement of low-viscosity, clear

fluids (<10 cSt). Measurement of liquids with higher viscosity can result in significant

measurement errors.

The KFG meters are calibrated at standard conditions in air (14.7 PSIG, 68° F).

Notes for KFG-1 series:

Non-conventional media, pressures or temperatures may require a user calibration on

site, by means of a comparison unit or volumetric test.

Attention! The media to be measured must not be contaminated. In

particular, large particles can cause jamming or destruction of the

rotor.

4. Operating Principle

KOBOLD flow meter KFG and KFF are being used to measure small and very

small flow volumes. The medium to be measured can be in gaseous form (KFG) or

in liquid form (KFF). These units function according to Pelton principle, meaning that

the flowing medium will set a paddle wheel in rotation. The rotary movement is

translated into pulses via photo cells. An electronic integrator uses these pulses to

generate a flow proportional, analog output signal (0-5 V).

KFF, KFG

03/04 Page 3

5. Unit Check-up

These devices are checked before shipment and sent away in perfect condition. Should

the damage to a device be visible, we recommend a thorough inspection of the delivery

packing. In case of damage, please inform your parcel service/ forwarding agent

immediately, since they are responsible for damages occuring during transit.

Scope of delivery

Standard scope of delivery applies:

Flow meter

Connection cable with plug:KF-7000

Instruction manual

6. Mechanical Connection

Before Installation

Please ensure that the actual flow volume is in agreement with the measuring

range of the device. The reference number of measuring range can be read

from the item number label.

Note: Continuously exceeding the measuring range can cause damage

to bearings.

Make sure that the maximum operational pressure and temperature are not

exceeded.

Ensure that there is no remaining packing material inside the unit.

KFG:

The calibration of the unit is performed in horizontal position; the item label faces

upwards. With other mounting positions, a measured-value deviation of 0.25 %/°C at

50% nominal flow should be taken into consideration.

KFF/KFG:

Mount the measuring device on desired position. Two mounting flanges are

supplied for this purpose. Connect unit to your piping system.

Do not remove the meter fittings as the calibration may change.

Attention:When tightening fittings, it is necessary to work with two suitable

wrenches. A transfer of torque on device's housing while tightening

the fittings can result in the destruction of the measuring device.

Check the sealing of all connections.

KFF, KFG

Page 403/04

7. Electrical Connections

Attention: Ensure that the voltage level of your supply system

corresponds with the voltage level required by the measuring

device. (+12.5 VDC ±2 VDC)

Make sure that the electrical supply lines are not active.

Connect the ends of supplied connection cable KF-7000 with your system,according to the

wiringdiagramshownbelow.Thegreen wireisusedonlyiftheunithasanoptionalpulseoutput.

Attention: An incorrect connection can lead to damage of the unit

electronics.

Connect the cable plug with the corresponding socket to the measuring device.

The plug and socket are indexed, so that an incorrect connection is impossible.

KF-7000 Connection Cable Wiring

KFF, KFG

03/04 Page 5

1 - Black (- V Power/Signal gnd.)

2 - White (0-5VDC Output)

3 - Red (+ V Power in)

1000 mm

40±3

6±1

8. Electrical Commissioning

KFF, KFG

The unit is supplied ready for operation. The electronics are adjusted and calibrated

to the sensor. By turning the potentiometer, located on the side of the electronics,

the analog output (0-5 V) can be adjusted by using a reference meter if necessary.

KFF, KFG

Page 603/04

9. Mechanical Commissioning

To avoid pressure spikes, flow medium should enter the unit slowly.

Attention: Pressure spikes generated by water hammer or caused by

magnetic valves, ball valves or similar devices, can lead to

destruction of the unit. During operation it must be

ensured that the sensor is completely filled with flow media.

Note: Large air bubbles in the measurement chamber can cause

error indications and may destroy the bearings and impeller.

10. Technical Data

Accuracy: ±3 % F.S.

Linearity: ±3 % F.S.

Repeatability: KFF:±0.2 % F.S.

KFG:± 1 % F.S.

Mounting Position: Horizontal

Temperature Range: 32 - 120° F

Maximum Pressure: KFF: Ryton:100 PSI, Brass:500 PSI, PTFE: 60 PSIG

KFG: 40 PSIG

Analog Output: 0-5 VDC

Supply Voltage: 12.5 VDC ± 2 VDC,regulated

Power Consumption: 35mA (typical)

Wetted Materials

All Units: See Current Datasheet

KFF, KFG

03/04 Page 7

11. Dimensions

KFF, KFG

Page 803/04

KFF/KFG-1... 1/8 " KFF/KFG-1... 1/4" KFF/KFG-1... 3/8"-1/2"

KFF/KFG-3...

KFF,KFG

03/04 Page9

12. Cautionary Information

PLEASE READ THE FOLLOWING GENERAL FLOW METER/MONITOR

WARNINGS BEFORE ATTEMPTING INSTALLATION OF YOUR NEW

DEVICE. FAILURE TO HEED THE FOLLOWING INFORMATION MAY

RESULT IN EQUIPMENT FAILURE AND POSSIBLE SUBSEQUENT

PERSONAL INJURY.

• Inspect the instrument for damage upon arrival. Cracked, fractured, or otherwise

damaged instruments must not be put into use, since the device is weakened to an

unknown extent.

• Under NO circumstances must the maximum tolerances of flow, pressure,

temperature, or supply voltage be exceeded.

• The maximum tolerances of the device have been determined using water, air,

and/or oil. If using other media, especially corrosive media, it is critically important

that the user determine chemical compatibility with our instruments. KOBOLD

Instruments Inc. cannot accept responsibility for failure and consequences

resulting from the use of media other than water, air, mineral oil or nitrogen.

• The sudden cessation of fluid flow causes what is typically called water hammer.

Water hammer is a transient force caused by the transfer of momentum of a

flowing fluid to the piping system when the flow of fluid is suddenly stopped (i.e.

pump trip or valve closure).

• Water hammer can cause fluid pressure surges, which could cause the flow

measuring device's pressure limit to be exceeded, resulting in equipment failure

and possible personal injury. These pressure surges can be particularly harmful if

the flow instrument is empty since there would be no backpressure in the device.

To avoid these pressure surges, the fluid lines should remain full and flow should

be introduced and isolated from the system slowly.

Freezing of fluid in the instrument must be avoided since the resultant expansion will

damage the flowmeter and make it unsafe for use.

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