Calibracion de controlador de presion

Solo disponible en BuenasTareas
  • Páginas : 9 (2034 palabras )
  • Descarga(s) : 0
  • Publicado : 29 de septiembre de 2010
Leer documento completo
Vista previa del texto
MI 011-476 Instruction
January 1980

Model 43AP Pneumatic Controller, Style B
Installation and Operation
Model 43AP Controller continuously detects the difference between a process measurement and its set point, and produces an output air signal that is a function of this difference and the type of control. The output signal is transmitted to a control valve or other control device. Theprocess measurement, set point, and output signal are indicated on the controller.

A Siebe Group Company

MI 011-476 – January 1980

Principle of Operation

Standard Specifications
Types of Control Suffix Code –A1: A2: A3: A4: A5: A7: A8: Control Limits Proportional: Reset: Derivative: Differential Gap: Output Signal: Air Supply: Air Consumption: Air Connections: Ambient Temperature Limits:Weight: Case: On-Off Proportional Proportional plus Derivative Proportional plus Reset Proportional plus Reset plus Derivative Differential Gap Automatic Shutdown

4 to 400% 0.01 to 50 minutes per repeat 0.05 to 50 minutes 1 to 100% 3-15 psi or 20-100 kPa 20 psi (140 kPa) 0.3 std ft3/min (0.5 std m3/h) Tapped for 1/4 NPT –40 to +180°F (–40 to +80°C) Approx. 10 lb (4.5 kg), excluding elementGlass fiber reinforced plastic

Principle of Operation
1. A differential linkage measures difference between measurement pointer and setting index positions. This error signal moves proportioning lever. 2. Proportioning lever pivots at its center on end of a flat spring. 3. This motion changes flapper nozzle relationship, causing relay to establish an output pressure. 4. Output pressure is fedback to proportioning bellows, which acts through proportioning lever to rebalance flapper nozzle. 5. Reset bellows and tank assembly are used when measurement must be maintained exactly at control point (without “offset”). 6. Derivative tank assembly is used to improve system response to a slow process.

2

Principle of Operation

MI 011-476 – January 1980

Controller with Proportional,Reset, and Derivative Actions, and Automatic-Manual Transfer System (Optional)

Proportional Control
For description, see Items 1 through 4 above.

3

MI 011-476 – January 1980

Principle of Operation

On-Off Control
On-off control is obtained by pivoting the proportional lever about a fixed point without proportioning or reset bellows. This controller can be equipped with an automaticshutdown unit.

Differential Gap Control
Differential gap control is obtained with positive feedback..

4

Installation

MI 011-476 – January 1980

Installation
Controller Mounting
Mount controller level on a rigid support. If controller has Type 37 Meter, see page 8.

Flush Mounting
After case is inserted in panel, install mounting brackets as shown. Slide brackets firmly againstpanel and tighten bracket bolts to case.
in mm

Surface Mounting
Loosely install mounting brackets flush with rear of case as shown. Attach brackets to panel with 1/4-inch bolts or #14 wood screws. Tighten mounting bracket bolts to case.
in mm

5

MI 011-476 – January 1980

Installation

Pipe Mounting
Remove mounting bracket from controller case. Securely fasten bracket on a 2-inchor 3-inch pipe. Then reinstall controller into bracket.

Controller Dimensions and Connections
Flush Mounting
in mm

Surface Mounting
in mm

6

Installation

MI 011-476 – January 1980

Pipe Mounting
in mm

Pressure Connection 1/4 NPT female (up to 2000 psi or 14 MPa) 1/2 NPT male (above 2000 psi or 14 MPa) 9/16-18 Aminco (from 10000 psi or 70 MPa) Pneumatic Receiver Connection1/4 compression fitting
NOTE

When installing piping, hold case connections stationary with wrench.

Optional Integral Filter-Regulator Set
in mm

Air Supply and Output Piping
For Control Valve Piping see Instruction MI 012-210.

7

MI 011-476 – January 1980

Installation

! WARNING Air is usually used as controller operating gas, and it is vented directly from case. If a...
tracking img