Kobold DW Series Manuale utente

KOBOLD DW SERIES FLOWMETER

User Instructions

DW_manual_3-04

KOBOLD Instruments Inc.

1801 Parkway View Drive

Pittsburgh, PA 15205

412-788-2830 Fax 412-788-4890

KOBOLD Instruments Canada Inc.

9A Aviation

Point Claire, QC H9R 4Z2

514-428-8090 Fax 514-428-8899

www.koboldusa.com

Table of Contents

1.0 General .................................................................................................. 1

2.0 Specifications ........................................................................................ 2

3.0 Installation Instructions........................................................................... 6

4.0 Operation .............................................................................................. 7

4.1 Adjusting the Setpoint ............................................................... 7

5.0 Maintenance .......................................................................................... 8

6.0 Arrival of Damaged Equipment .............................................................. 8

7.0 Need Help With Your DW ........................................................................ 8

List of Diagrams

Diagram 1.5 Function Diagram ......................................................... 1

Diagram 2.3 Electrical Connections ................................................. 3

Diagram 2.5 Wiring Diagram & Specifications for DWU w/ 4-20mA 4

Diagram 2.6 Dimensions ................................................................... 5

List of Tables

Table 2.1 Technical Data ................................................................ 2

Table 2.2 Material Combination & Operating Limits ........................ 3

Table 2.4 Microswitch Data ............................................................. 4

Table 3.1 Flow Symbol Key ........................................................... 6

FM Rev 03/04

KOBOLD DW SERIES FLOWMETER

User Instructions

CAUTION: For safety reasons, please read the cautionary information located at

the end of the manual, before attempting installation.

1.0 General

The KOBOLD DW flowmeters and switches are intended for use in monitoring and

measuring (DWU only) control applications involving high flow rates and/or dirty media.

The DWS and DWP versions monitor flow rate through a setpoint feature. At setpoint, an

internal microswitch is activated, allowing control of other equipment. The DWU has the

same setpoint triggering capability as well as a meter scale for displaying flow rate.

The devices operates as follows:

1. Flowing medium impacts upon a paddle attached to a lever which has its pivot

point in the instrument housing (see diagram 1.5). This causes the paddle and

lever arrangement to pivot about its hinge point.

2. The motion of the paddle is opposed by a spring whose strength determines

the range of the instrument. The motion of the paddle is coupled to an

indicator dial, in the DWU, calibrated for the flow rate of the device.

3. Positioned in the path of the paddle/lever is a microswitch contact. When the

lever pivots through a preset angle, the microswitch is activated.

Diagram 1.5; Function Diagram

DW 2

FM Rev 03/04

Operation:

a. Flowing medium exerts force on paddle (1).

b. Motion of paddle is opposed by spring (2).

c. Bellows (3) isolates the paddle from the rest of the system. It also opposes

paddle motion due to its own spring constant.

d. Motion of paddle operates pointer (4) which indicates flow on scale (5).

e. If the paddle pivots further than a preset angle, a microswitch (6) is activated.

This causes a lamp (7) to change state.

f. Screw (on face of DWS, or rear of DWU) is used to position the microswitch at

the desired setpoint. DWP versions have a factory preset switchpoint and are

not field adjustable.

The mechanical/electronic portion of the DW is isolated from the medium through use of

a bellows. Since the bellows is elastic, a pressure difference between atmosphere (one

surface of the bellows) and the medium (the other side), will result in a change of the

bellows' spring constant. It is important, therefore, that the DW series be used only at

their intended operating pressure if accurate flow readings are desired.

2.0 Specifications

Table 2.1; Technical Data

Operating Principle: Paddle/bellows arrangement

Dimensions: See Diagram 2.6

Range: 4:1 or 5:1 (depending on pipe size)

3DW

FM Rev 03/04

Table 2.2; Material Combination & Operating Limits

Diagram 2.3; Electrical Connections

Component

Material Combination

0200 0300

T-Piece Brass 316-Ti SS

Paddle Brass 303 SS

Bellows 316-Ti SS 316-Ti SS

Housing: Measuring Section Matte Aluminum

Housing: Cover Clear Polycarbonate

Flanges (on Flanged Units) Galvanized Steel 316 SS

Maximum Operating Pressure 145 PSIG

Maximum Operating Temperature 210° F

Maximum Ambient Temperature 160° F

DW 4

FM Rev 03/04

Table 2.4; Microswitch Data

Quantity: 1 or 2 SPDT

Switch Hysteresis: +/- 10%

Maximum Load: 10 A/250 V, 2500 VA maximum

Status Lamp Power Supply: 220 VAC, or 110 VAC, or 24 VDC

Diagram 2.5 Wiring Diagram for DWU Series with 4-Wire 4-20 mA Transmitter/

LCD Display

KL1

KL2

+ 24 VDC

- GND

+ 4-20 mA

- GND

SPDT Relays (optional) are connected at KL1

Power and Analog output are connected at KL2

Power: Connected at +24 VDC and GND

Output: 4-20 mA active, connected at

+ 4-20 mA and GND.

Specifications for DWU with LCD and Analog Output

Output: 4 - 20mA, 4-wire

Load: 0-500 Ohms

Power Requirement: 24 VDC +/- 10%

Display: 8- Digit LCD with option AN1

Adjustments: Zero: +/- 4%

Span:+/-10%

Optional Relays: 0, 1 or 2 SPDT

Maximum Load: 1A @ 230 VAC

Protection: NEMA 4

5DW

FM Rev 03/04

Diagram 2.6; Dimensions

DW 6

FM Rev 03/04

3.0 Installation Instructions

CAUTION: For safety reasons, please read the cautionary information located at

the end of the manual, before attempting installation.

The KOBOLD DW series meters and switches are to be installed in the orientation

described by the symbol on the identification tag. (See Symbol Key, Diagram 3.1). In

general, the DW series may be installed in any desired position. The user, however,

must specify the installation orientation so that the flow scale is calibrated for this position

DURING MANUFACTURE. Installation in other positions will lead to inaccurate flow rate

indication.

Table 3.1; Flow Symbol Key

= To the left of line

= To the right of line

= Horizontal flow, left to right

= Horizontal flow, right to left

= Vertical flow, down

= Vertical flow, up

The DW is connected to your system in one of three fashions:

1. Pipe Fittings: Connect in direction indicated using appropriate tools.

2. Flange Connection: Connect in direction indicated using the flanges and the

gasket provided.

3. Weld Connection: The weld-on DW’s come with two flanges; one is

connected to the DW and the other to the joint to be welded to your pipe. Cut

a hole in the pipe into which the flange pipe will fit cleanly. This will guarantee

that travel of the paddle will not be hindered.

In welding the flange pipe to your system, it is important to keep the distance

between flange face and top of your system pipe at 50mm (See Diagram 2.6,

Dimensions). If this distance is not observed, flow rate measurement errors

will occur.

Observe also that when the flowmeter is re-installed on the flange, it

positioned so that the flow direction in the pipe and that indicated on the

instrument, match after installation.

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