Barton 227C Bedienungsanleitung

MODEL 227C

DIFFERENTIAL PRESSURE INDICATOR

w/224C DPU

Installation Manual

Version 00K25c

ID#10120

11/2000

SECTION 1 - INTRODUCTION

General

The Model 227C DP Indicator measures liquid flow or liquid level. For flow

measurements, the instrument is connected to the low and high pressure sides

of a primary device (e.g., orifice plate, venturi tube, or flow tube) located in the

process run. For liquid level, the instrument is connected to measure changes in

differential pressure relative to variations of liquid height in a vessel.

Theory of Operation

The bellows within the DPU moves in response to changes in the differential

pressure measured at the primary device installed in the process system.

Movement of the bellows (in direction of decreasing pressure) is mechanically

transferred to the indicator mechanism, which in turn positions the indicating

pointer.

SAFETY

Before installing this instrument, become familiar with the installation instructions

in Section 2. WARNING notes that appear on the following pages of this manual

should be reviewed before proceeding: 3, 6, and 7.

WARNING notes indicate the presence of a hazard which can cause severe

personal injury, death, or substantial property damage if warning is ignored.

CONTENTS

Section 1 - Introduction ............................................................. Page 1

Section 2 - Installation ............................................................... Page 2

Section 3 - Maintenance ............................................................ Page 4

Section 4 - Troubleshooting ....................................................... Page 9

Section 5 - Installation Drawings................................................. Page 10

Section 6 - Parts/Drawing List ................................................... Page 14

DPU Specifications ................................................................... Page 19

Instrument Specifications ........................................................... Back Page

SECTION 2 - INSTALLATION

General

The instrument should be inspected at time of unpacking to detect any damage

that may have occurred during shipment. Note: The DPU was checked for

accuracy at the factory — do not change any of the settings during examina-

tion or accuracy will be affected.

For applications requiring special cleaning/precautions, a polyethylene

bag is used to protect the instrument from contamination. This bag

should be removed only under conditions of extreme cleanliness.

DPU Installation

Mounting

A. Flush or Panel

1. Cut an opening in the panel and drill four holes (17/64"), per outline

dimension drawings (Section 5).

2. Pass the instrument through the cutout in the panel (from panel front).

3. Attach the indicator to the panel with four screws.

B. Wall

1. Remove the pipe mounting U-bolts from bracket.

2. Drill four holes in the wall to match the bracket mount holes, per

outline dimension drawing.

3. Attach indicator to wall with bolts and nuts.

C. Pipe

Refer to outline dimension drawing. The unit must be mounted approxi-

mately level for proper operation.

Piping

Observe the following practices:

1. Shorten the distance between the primary device and the DPU as much as

possible. Distances exceeding 100 feet are not recommended. For

distances up to 50 feet, use 1/4-inch pipe or tubing. For runs of 50 to

100 feet, use 1/2-inch pipe or tubing. The recommended limitation does

not apply if an air purge or blow-back system is used.

2. Slope all piping at least one inch per linear foot to avoid liquid or gas

entrapment.

3. Provide two feet of uninsulated piping between the DPU and the primary

device for each 100 degrees in excess of +180°F (+162°C), if process

media exceeding +200°F (+93.3°C) must be measured.

4 Assure that the temperature of the DPU never exceeds 180°F (+162°C).

When steam tracing is necessary, the steam pressure should not exceed five

pounds per square inch and insulation should not be used. If pressure must

exceed five pounds per square inch, limit the length of tubing around the

DPU to two turns and do not insulate.

5. When severe pulsation is present, install a suitable pulsation dampening

device upstream of the DPU; otherwise, accuracy will be affected.

6. Mount the DPU on a solid support to minimize vibration. Tighten all

points, using a suitable compound; leaks in piping can cause measurement

errors.

7. Rotate the housing as necessary to place the connection in the proper

position. The DPU has connections in the pressure housings to accommo-

date various pipe sizes (refer to Section 5 Outline Dimensional Drawing).

8. Install a valve manifold connecting the DPU and the source of differential

pressure to facilitate operation and checking of the DPU.

9. Install all shutoff and bypass valves so they are easily accessible from the

front of instrument. Locate block valves at the source of differential

pressure.

WARNING

HIGH PRESSURE HAZARD. TO PREVENT PERSONAL INJURY

OR DAMAGE TO EQUIPMENT, DIRECT ALL PIPING AWAY FROM

THE OPERATOR WHILE CONNECTING THE DPU TO THE

SYSTEM PIPING.

NOTICE

Do not share filling or vapor return lines with DPU piping lines.

Startup

Observe the following practices when starting up an instrument:

1. Always start with the block valves closed.

2. Perform a zero check on the instrument as follows.

a. Open the bypass valve(s), then open one shutoff valve. This procedure

equalizes the pressure between both sides of the instrument. The

instrument should indicate zero.

b. If the instrument does not indicate zero, check for gas or liquid

entrapment in the lines or in the DPU (depending on the orientation of

the piping layout and service).

c. If necessary, adjust the pen or pointer by turning the zero adjust on the

instrument.

NOTE: For gas service, it is recommended that zero check be performed

with both block valves closed. If the gas flow is pulsating, there may be a

standing wave effect in the process line which can displace the indicator

and appear as a zero error.

3. Check the manifold and piping for leaks as follows.

a. Open the bypass valve(s), then open one shutoff valve to pressurize the

instrument.

b. Close the shutoff valve and the bypass valve.

c. Any leakage will be indicated by pen or pointer movement, up or down

scale.

NOTE: Be careful not to subject the DPU to unnecessary shock or

overrange pressure during operations.

Required Tools

Tool Purpose

Pointer puller Pointer removal

Small screwdriver Calibration adjustments

Medium screwdriver Bezel removal/DPU bracket screws

1/8" Open-end wrench Calibration adjustments

50 lb. Torque wrench Pressure housing bolts

3/16" Allen socket wrench Pressure housing bolts

5/16" Allen socket wrench Pressure housing bolts

Calibration Kit

Torque Wrench (50 ft./lbs.) Pressure housing bolts

Test/Calibration Equipment

Accessing Indicator Mechanism

Before attempting to perform

calibration of the instrument,

remove the cover glass, scale plate

and pointer of the indicato}`as

follows:

1. Loosen three bezel screws

located on the front of the

bezel.

2. Tilt out the bottom of the

bezel and slide the bezel

upward.

3. Remove the indicating pointer

using the pointer puller.

4. Remove the scale mounting screws and remove the scale plate.

Disassembly to this point provides full access to all indicator movement parts

and adjustments.

SECTION 3 - MAINTENANCE

Calibration Check

Normally all that is required to adjust the indicator to the factory-set calibration

tolerances is to perform the following calibration check.

1. Connect the instrument to a standard pressure source as shown in Test/

Calibration Equipment, page 4.

2. Remove the plug from the low pressure housing.

3. Apply approximately 150% of the differential pressure range to the high

pressure housings. Release pressure. Repeat 3 or 4 times.

4. Apply 0%, 50% and 100% of full scale pressure. If indication is within the

specified limits, no further adjustments are necessary. If the zero indication

is incorrect, remove the bezel and glass assembly (per Accessing Indicator

Mechanism procedure on page 4) and adjust the pointer by turning the

pointer by the hub.

5. Replace the bezel and glass assembly. The bezel gasket

(0277.0026C) must be installed as shown below:

The two snubbers (0266.0028C) on the scaleplate should not be com-

pressed against the glass cover and the pointer should not touch the glass.

Notice

Ensure correct bezel gasket orientation before placing instrument

back in service. Incorrect bezel gasket orientation will cause the

instrument indicator to jam, resulting in inaccurate readings.

Complete Calibration

A complete calibration of the instrument is required whenever the DPU assem-

bly is replaced.

1. Connect the instrument to a standard pressure source as shown in the Test/

Calibration Equipment illustration on page 4.

2. Attach linkage between drive arm and movement. (The illustration on the

right shows alignment at 50% differential pressure.)

Inspect parts for straightness and pivot-fit without binding.

3. Set the pointer at zero on the scale by slipping the pointer on the hub.

Hold the pointer tip and turn the hub with a wrench.

4. Apply 100% differential pressure. If pointer exceeds 100% on the scale,

lengthen the range arm. Remove pressure.

Cleaning and Inspection

WARNING

(High Pressure Gas Installations

with pressures greater than 200 psig)

HIGH PRESSURE GAS HAZARD ON DISASSEMBLY OF DPU. TO

PREVENT POSSIBLE SEVERE PERSONAL INJURY, DEATH, OR

SUBSTANTIAL PROPERTY DAMAGE DUE TO THE RELEASE OF

INTERNAL PRESSURE, PERFORM THE PRESSURE CHECK

PROCEDURE THAT FOLLOWS (Step A) BEFORE REMOVING

THE DPU HOUSING BOLTS.

NOTICE

If accumulation of solids or semi-solids is extensive, remove the housings

carefully to prevent damage to the bellows.

A. Pressure Check

This procedure should be performed prior to removing the DPU housing

bolts, especially if the DPU has been installed in gas applications with

working pressures greater than 200 psig.

1. Back off all housing bolts 4 turns.

5. Set zero and span using the hub for the zero adjustment and the range

adjust screw on the movement for span adjustments.

6. Apply 50% differential pressure. If linearity adjustment is required, loosen

the drive arm and move the arm to shift the pointer in the direction of the

error (approximately 10:1). Re-tighten drive arm.

7. Reset zero and check

span. If the gear in the

movement reaches its

limit of travel due to the

linearity adjustment, slop

the gear approximately

5°from the 37.5°angle

to approximately 43°.

Retest at 50% and 100%

differential pressure and

adjust linkage until

pointer readings are

acceptable.

8. Apply 0%, 25%, 50%, 75%, and 100%, 75%, 50%, 25%, and 0%

differential pressure to the indicator without overshoot. Lightly tap the

indicator to overcome the effects of friction.

9. Test repeatability at 0%, 50%, 0% 50%.

10. Set stops to prevent pointer from striking snubbers on the scale.

11. Tighten all screws. Test by moving the pointer (by finger) from zero to 50%

and return. An off-set in zero reading indicates pointer slippage.

2. Check for internal pressure by attempting to move the housing in and

out along the bolts.

a. If the housing moves freely — no pressure is present — servicing

or repair may continue.

b. If the housing does not move freely — the bellows may be

pressurized and is potentially hazardous if further disassembled.

Tighten the bolts and return the unit to the factory or authorized

Barton service center for repair.

Tag the unit and specify “Gas in Bellows”.

B. Cleaning/Inspection Procedure

Instruments used in services where solids or semi-solids may accumulate

inside the pressure housings require periodic inspection and cleaning, as

follows.

1. Remove the DPU from service and remove the pressure housings.

2. Carefully remove the pressure housings from the bellows unit assembly.

NOTICE

IF THE ACCUMULATION OF MATERIAL INSIDE THE HOUSING IS

EXTENSIVE, RAPID REMOVAL OF THE HOUSING MAY DAMAGE

THE BELLOWS CONVOLUTIONS.

3. Remove the accumulation from between the bellows convolutions and

from the inside of the housings. Use a solvent if possible. Do not use

a sharp instrument to clean between convolutions.

4. Assure that there are no broken range springs.

5. Replace the housings and O-rings.

6. Set the pressure housing bolts to the torque values listed on page 8.

Range Change

To change the range of the DPU, the bellows unit assembly (BUA) must be

replaced with a unit of the desired range. See BUA Replacement Procedure.

BUA Replacement

WARNING

Review the Warning and Notice under Cleaning and Inspection on page 6

before performing this procedure.

NOTICE

Do not loosen the drive arm hold plug located in the top of the BUA center

plate, when removing the mounting bracket. If the plug is loosened, the fill fluid

in the bellows will be lost.

1. Remove the instrument from service.

2. Remove the bezel, cover glass, pointer, scale plate of the indicator, per

Accessing Indicator Mechanism on page 4.

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* Lubricants: Molykote G paste, Teflon-base pipe dope, graphite-base grease, or

similar lubricants. Lube first thread only.

** Torque on bolts is accomplished in 3 or 4 steps. Tighten uniformly.

*** Rotation of bolt head is measured after bolt is snug, with approximately

2 ft./lbs.torque. Do not exceed this rotation. To tighten bolts without a torque

wrench, use the following values: 1/4 turn = 90°1/2 turn = 180°

3. Loosen instrument drive arm and separate it from the torque tube shaft.

Do not disconnect the instrument linkage.

4. Remove the indicator movement mounting screws.

5. Remove the four Allen head DPU mounting screws, and separate the DPU

from the indicator case.

6. Perform Pressure Check Procedure under Cleaning and Inspection on

page 6. If internal pressure was found, do not continue. Tighten the

bolts and return the unit to the factory or authorized Barton service

center for repair. Tag the unit and specify “Gas in Bellows”.

7. If no internal pressure was found in Step 6, remove the DPU mounting

bracket, pressure housing bolts, and the pressure housings.

8. Place the pressure housings onto the new BUA and attach with the

housings bolts (see Table below).

Torque Settings

Notice

It is recommended that new O-Rings be used when replacing the

pressure housings.

9. Reattach the DPU to the instrument and install the instrument into service

in reverse order of removal.

10. Perform a full calibration, per Complete Calibration on page 5.

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SECTION 4 - TROUBLESHOOTING

SECTION 5 - INSTALL DRAWINGS

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