Reference Manual

Section 3: Installation

00809-0100-4102, Rev AA

May 2013

 

 

In normal operation the two block valves between the process and instrument ports will be open and the equalizing valve will be closed.

H

 

L

Drain/

 

Drain/

Vent

 

 

Vent

Valve

 

Equalize

Valve

 

 

 

 

(closed)

 

Isolate

Isolate

(open)

(open)

Process

1.

To zero the 2051, close the

H

 

L

 

block valve to the low

 

 

Drain/

 

Drain/

 

pressure (downstream) side

 

 

of the transmitter first.

Vent

 

Vent

 

Valve

Equalize

Valve

 

 

 

 

 

 

 

 

 

(closed)

 

 

 

Isolate

 

Isolate

 

 

(open)

 

(closed)

 

 

 

Process

 

2.

Open the center (equalize)

H

 

L

 

valve to equalize the pressure

Drain/

 

Drain/

 

on both sides of the

 

 

Vent

 

 

transmitter. The manifold

 

Vent

 

Valve

 

 

Equalize

Valve

 

valves are now in the proper

 

 

 

 

 

 

(open)

 

 

configuration for zeroing the

 

 

 

Isolate

 

Isolate

 

transmitter.

 

 

(open)

 

(closed)

 

 

 

 

 

 

 

Process

 

3.

After zeroing the transmitter,

H

 

L

 

close the equalizing valve.

 

 

Drain/

 

 

 

 

 

Drain/

 

 

Vent

 

 

 

 

Vent

 

 

Valve

 

 

 

Equalize

Valve

 

 

 

 

 

 

 

 

 

 

(closed)

 

Isolate

Isolate

(open)

(closed)

 

Process

4.

Open the block valve on the

H

 

L

 

low pressure side of the

 

 

 

 

 

 

transmitter to return the

Drain/

 

Drain/

 

transmitter to service.

Vent

 

Vent

 

 

Valve

Equalize

Valve

 

 

 

 

 

 

 

 

 

 

(closed)

 

Isolate

Isolate

(open)

(open)

Process

Installation

51

Page 63
Image 63
Emerson 00809-0100-4102 manual To zero the 2051, close Block valve to the low, Pressure downstream side Transmitter first