Azbil KDP, Kfdb User Manual

Dierential Pressure Detectors

(Meter Bodies)

Model KDP/KFDB

User's Manual

OM2-5220-1100

NOTICE

While the information in this manual is presented in good faith and believed to be accurate, Azbil Corporation disclaims any implied warranty of merchantability or fitness for a particular purpose and makes no express warranty except as may be stated in its written agreement with and for its customer.

In no event shall Azbil Corporation be liable to anyone for any indirect, special or consequential damages. This information and specications in this document are subject to change without notice.

Chapter 1. DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1-1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-2. MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-3. INSTRUCTIONS FOR INSTRUMENTS (TRANSMITTERS AND CONTROLLERS) USED IN

CONJUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Chapter 2. STRUCTURES OF METER BODIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2-1. EXTERNAL VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2-2. STRUCTURES AND OPERATING PRINCIPLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Chapter 3. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3-1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3-2. BRACKET AND BOLTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3-3. PLACE OF INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3-4. INSTALLATION METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3-5. PRESSURE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3-6. ELEVATION AND SUPPRESSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 4. OPERATION METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4-1. DIFFERENTIAL PRESSURE (FLOW) TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

4-2. LIQUID LEVEL TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Chapter 5. INSPECTION AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5-1. CHECK FOR LEAK FROM PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5-2. BLOW AND CLEANING OF METER BODY AND PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Chapter 1. DESCRIPTION

1-1. GENERAL

The differential pressure detector (meter body) accepts a differential pressure through its high and low pressure connection ports, converts the differential pressure into a torque force by its center section to which the high and low pressures are applied through respective diaphragms, and feeds a torque via its torque tube to a pneumatic transmitter (Model KDP) or a pneumatic controller (Model KFDB). Some models of detectors have a flange incorporated with diaphragm for connection of the high pressure line.

1-2. MODELS

Measured Pressures or Type

of Instrument

Standard Type, High/Medium Differential Pressures

Standard Type, Low Differential Pressures

Standard Type, Very Low Differential Pressures

Flange Type Models KDP61/62

Remote-sealed diaphragm Type Models KDP71/72

High Working Pressure Type Models KDP81/82

1-3. INSTRUCTIONS FOR INSTRUMENTS (

Model Numbers of

Instruments Used in

Conjunction

Models KDP11/22 Models KFDB11/22

Model KDP33 Model KFDB33

Model KDP44 Model KFDB44

Models KFDB61/62

Models KFDB71/72

Models KFDBSl/82

Operator‘s Manual Used

in Conjunction

OM2-5220-1101 (KDP) OM2-6220-0000 (KFDB)

TRANSMITTERS AND CONTROLLERS

)

USED IN CONJUNCTION

For the instructions for instruments used in conjunction, refer to respective Operator‘s Manuals which cover the operating principles, service and unit replacement procedures, and calibration and adjustment procedures of these instruments.

Chapter 2. STRUCTURES OF METER BODIES

2-1. EXTERNAL VIEWS

Although external views of meter bodies differ by models as shown in Fig. 2-1, the bracket mounting section and instrument connection section are identical for models 11/22, 71/72, and for models 33/44, 81/82.

Fig. 2-1. External Views of Meter Bodies

2-2. STRUCTURES AND OPERATING PRINCIPLES

The structures and operating principles of the meter bodies are covered in this section.

2-2-1. Models 11/12, 33, and 81/82

(a) The high and low process pressures (HP and LP) are fed via diaphragms (1) and (2) to

the center section (oil filled section) of the meter body. The HP acts on the differential pressure detecting bellows from the right hand side (3) and the LP from the left hand side (4). When in the equilibrium state (zero differential pressure state), identical forces are exercised on both sides of the differential pressure detecting bellows (5).

(b) As the pressure of the HP side rises thereby increasing the differential pressure, the

differential pressure detecting bellows moves leftward. The movement of the bellows is fed as a torque via the torque arm to the beam of the transmitter.

1 HP SEAL DIAPHRAGM 2 LP SEAL DIAPHRAGM 3 LIQUID FILL OF HP SIDE 4 LIQUID FILL OF LP SlUE 5 DIFFERENTIAL PRESSURE DETECTING BELLOWS 6 DAMPING CONTROL (OPTIONAL) 7 TORQUE ARM 8 TORQUE TUBE

Fig. 2-2. Operating Principle of Meter Body

2-2-2. Model 44

(a) The high and low process pressures (HP and LP) are fed via the diaphragms and supports

(1) to the center section (silicone filled section) (2) of the meter body. The HP acts on the pressure detecting diaphragm from the right hand side and the LP from the left hand side. When in the equilibrium state (zero differential pressure state), identical forces are exercised on both sides of the differential pressure detecting diaphragm.

(b) As the pressure of the HP side rises, the support moves leftward. The liquid fill flows

through the damping control (3). The movement of the diaphragm is fed as a torque via the torque arm (4) to the beam of the transmitter.

1 DIAPHRAGM AND SUPPORT 2 LIQUID FILL 3 DAMPING CONTROL 4 TORQUE ARM 5 TORQUE TUBE

Fig. 2-3. Operating Principle of Meter Body

2-2-3. Models 61/62

(a) The high and low process pressures (HP and LP) are fed via diaphragms (2) and (11)

to the center section (silicone filled section) of the meter body. A pressure which is proportional to the liquid head in the process vessel is fed via the seal diaphragm (2) and liquid fill to the bellows (5) at the center section of the meter body.

(b) The bellows (5) moves in proportion to the liquid head pressure. The movement of

the bellows is fed as a torque via the plunger (6) and torque arm (7) to the beam of the transmitter.

1 PROCESS CONNECTION FLANGE 2 SEAL DIAPHRAGM 3 DAMPING CONTROL (OPTIONAL) 4 HP LIQUID FILL (SILICONE) 5 BELLOWS 6 PLUNGER 7 TORQUE ARM 8 TORQUE TUBE 9 OVERLOAD SEAL 10 LP LIQUID FILL (SILICONE) 11 SEAL DIAPHRAGM 12 CENTER BODY 13 LP COVER

Fig. 2-4. Operating Principle of Meter Body

2-2-4. Models 71/72

(a) The high and low process pressures (HP and LP) are fed via diaphragms (2) to the

center section (silicone filled section) (11) of the meter body. The HP is fed via the seal diaphragm (2) and liquid fill (4) to the bellows (5) at the center section of the meter body. The LP is fed bia the seal diaphragm (2) and liquid fill (10) to the bellows (5).

(b) The bellows (5) moves in proportion to the differential pressure between HP and LP.

The movement of the bellows is fed as a torque via the torque rod (8) to the beam of the transmitter.

1 PROCESS CONNECTION FLANGE 2 SEAL DIAPHRAGM 3 DAMPING CONTROL 4 HP LIQUID FILL (SILICONE) 5 BELLOWS 6 PLUNGER 7 TORQUE ARM 8 TORQUE ROD 9 OVERLOAD SEAL 10 LP LIQUID FILL (SILICONE) 11 CENTER BODY

Fig. 2-5. Operating Principle of Meter Body

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