ITT Controls Barton Nuclear 227A Bedienungsanleitung

BARTON®NUCLEAR MODEL 227A/227AS

DIFFERENTIAL PRESSURE INDICATOR

User Manual

Part No. 9A-C10122, Rev. 02

April 2011

Contents

Safety............................................................................................................ 2

Section 1—Introduction................................................................................. 3

General ......................................................................................................... 3

Product Description....................................................................................... 3

................................................................................................ 5

Section 2—Installation................................................................................... 7

General ......................................................................................................... 7

Mounting/Piping/DPU Installation ................................................................. 7

Zero Check/Adjustment ................................................................................ 7

Startup .......................................................................................................... 8

Section 3—Maintenance and Calibration..................................................... 9

Tools.............................................................................................................. 9

Bezel/Lens (or Cover) Installation and Removal .......................................... 9

Calibration Check........................................................................................ 10

Pointer Installation and Removal ................................................................ 10

Pointer Installation .................................................................................. 10

Pointer Removal...................................................................................... 10

Indicator Calibration.....................................................................................11

Drive Arm Tightness Test......................................................................... 14

Drive Arm Stop Adjustment .................................................................... 14

Troubleshooting ......................................................................................... 14

Linkage.................................................................................................... 14

Pointer..................................................................................................... 14

DPU......................................................................................................... 14

Section 4—Assembly Drawings and Parts Lists....................................... 15

Section 5—Dimensional Drawings ............................................................. 23

Appendix A—Model 224 DPU ....................................................................A-1

DPU Description ........................................................................................A-1

.........................................................................................A-1

Theory of Operation ...............................................................................A-3

DPU Installation .........................................................................................A-4

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Model 227A Dierential Pressure Indicator Section 1

Section 1—Introduction

General

The Model 227A Differential Pressure Indicator is designed to measure

measurement applications, the instrument is connected to monitor changes in

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

Product Description

The indicator has a 6-inch dial. The indicating pointer traverses a 270° arc

Figure 1.1.

The 227A indicator is actuated by a Model 224 Differential Pressure Unit

(DPU). See Appendix A for details.

The indicator is attached directly to the DPU. The instrument consists of

a drive arm assembly, linkage, and a movement assembly. The indicating

pointer is attached to the movement assembly. Changes in differential pres-

sure are sensed by the DPU bellows and transmitted as rotary motion through

the torque tube to the drive arm assembly of the indicator. The linkage and

movement assembly respond to the action of the drive arm assembly to posi-

tion the pointer in direct relationship to the amount of bellows travel.

Pointer Stop

Max. LineZero Line

Pointer

Zero Adjust

Range Adjust (Universal Unit)

Scale Plate

Range Adjust

(Inverted Unit)

Figure 1.1—Instrument face

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Section 1 Model 227A Dierential Pressure Indicator

The indicator movement has a micrometer screw for range adjustment. Zero

is adjusted by "slipping" the pointer on the hub. Both the zero and range ad-

justments can be made without removing the scaleplate or pointer. Linearity

adjustments are accessible when the scale plate is removed.

The orientation of the indicator mechanism varies with the case design. In the

universal case design (Figure 1.2), the torque tube extends through a hole in

the bottom half of the indicator, and the range adjust control is located in the

top half. In the inverted design (Figure 1.3, page 5), the torque tube extends

through a hole in the top half of the indicator, and the range adjust control is

The indicator is available in two case material variations. The standard Model

227A indicator has a black aluminum case, and the Model 227AS indica-

tor has a stainless steel case. Model 227A holds a fully-functional nuclear

structural integrity and pressure boundary integrity applications.

Figure 1.2—Indicator mechanism for universal case

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Model 227A Dierential Pressure Indicator Section 1

Figure 1.3—Indicator mechanism for inverted case

Because the indicator design affects the readout, only inverted scale plates

may be used with inverted indicators, and only universal scale plates may be

used with universal type units. See Table 4.1, page 17

descriptions and part numbers.

Accuracy (DP Range):

0-30" w.c. to 0-50" w.c.

(0-75 mbar to 0-124 mbar) ............. ±0.75% of full scale

0-51" w.c. to 0-60 psi

(0-127 mbar to 0-4.1 bar) ............... ±0.5% of full scale

0-61 psi to 0-150 psi

(0-4.2 bar to 0-10.3 bar) ................. ±0.75% of full scale

0-151 psi to 0-400 psi

(0-10.4 bar to 0-27.6 bar) ............... ±1.0% of full scale

0-401 psi to 0-600 psi

(0-27.7 bar to 0-41.3 bar) ............... ±1.5% of full scale

0-601 psi to 0-1,000 psi

(0-41.4 bar to 0-69 bar) .................. ±4.0% of full scale

Dial Size ......................................... 6 inches (150 mm)

Temperature Limits ......................... -40 °F/°C to +180°F (+82°C)

Indicator Case ................................

Lens................................................ Polycarbonate (shatterproof glass for SST version)

O-rings (Wetted)............................. Viton or EPT

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Section 1 Model 227A Dierential Pressure Indicator

Overall Dimensions ........................ See Section 5, page 23.

Weight ............................................ -

tion and materials

Differential Pressure Unit (DPU):

Appendix A.

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Model 227A Dierential Pressure Indicator Section 2

Section 2—Installation

General

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

age that may have occurred during shipment.

IMPORTANT: The DPU was checked for accuracy at the factory. Do not change any of

the settings during examination or accuracy could 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.

Mounting/Piping/DPU Installation

Dimensional drawings are provided in Section 5, page 23. See Appendix A for

DPU installation and maintenance information.

Zero Check/Adjustment

Before placing the 227A indicator into service, check the zero indication, and

adjust if necessary. Zero adjustment can be accomplished without removing

the scale plate.

IMPORTANT: Adjusting the instrument's zero indication in accordance with the fol-

lowing procedure does not invalidate the original factory calibration or

warranty.

To check the zero indication, perform the following steps.

1. Mount the instrument in an approximately level position and connect to a

standard pressure source (see Appendix A).

2. If the zero indication is incorrect, adjust it as follows:

a. Remove the bezel and cover following the instructions provided in

Bezel/Lens (or Cover) Installation and Removal, page 9.

b. Using a 1/4" open-end wrench (included in calibration toolkit, Part

scale. See Figure 2.1, page 8.

c. Reassemble the unit, attaching the lens gasket, lens, and bezel to the

case per the instructions on page 9.

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Section 2 Model 227A Dierential Pressure Indicator

HUB

Pointer "slipped"

rotated on hub

Hub held in place

with 1/4" wrench

Figure 2.1—"Slipping" pointer

Startup

For startup procedures, warnings, and other information, refer to Appendix A.

IMPORTANT: To ensure the unit calibration is within factory-set calibration tolerances,

perform the Calibration Check procedure on page 10.

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Model 227A Dierential Pressure Indicator Section 3

Section 3—Maintenance and Calibration

For preventive maintenance, periodically inspect linkage for wear.

When repairs are necesssary, review this section for maintenance procedures

such as bezel/lens installation and removal, scale plate installation and re-

moval, pointer installation and removal, and indicator calibration.

IMPORTANT: See Appendix A for related warning/caution notices and instructions

on DPU inspection, cleaning, service, repair, range change, and BUA

replacement. Never perform maintenance/repair on the instrument

or DPU without reviewing all procedures and warning/caution

notices in Appendix A.

Tools

The following tools are recommended for general maintenance of the Model

227A DP indicating switch.

Table 3.1—Tools

Equipment Purpose

Pointer Puller Pointer removal

Small Screwdriver Scale plate removal and replacement

Medium Screwdriver Bezel removal and replacement

1/4" and 1/8" Open-end Wrenches Zero (1/4") and Range (1/8") adjustments

Bezel/Lens (or Cover) Installation and Removal

To remove the bezel and lens (or cover), perform the following steps.

1. Loosen the three screws on the front of bezel (Figure 3.1).

2. Tilt the bottom of the bezel and slide the bezel upward.

To reinstall the bezel and lens, assemble the components per Figure 3.1. The

two snubbers (Part No. 9A-C0266-0028C) on the scale plate should not be

compressed against the lenscoverand the pointer should not touch the lens.

Bezel

(9A-C0277-0029C) Cover (Lens)

(9A-C0181-0038C)

Gasket

(9A-C0277-0026C)

Case

Figure 3.1—Bezel and lens cover

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Section 3 Model 227A Dierential Pressure Indicator

IMPORTANT: Ensure the bezel gasket is properly oriented before placing the instru-

ment back in service. Incorrect gasket orientation will cause the instru-

ment indicator to jam, resulting in inaccurate readings.

Calibration Check

To ensure the unit calibration is within factory-set calibration tolerances,

perform the following procedure.

IMPORTANT: Review all procedures, WARNINGS/NOTICES in Appendix A BEFORE

performing this procedure.

1. Mount the instrument in an approximately level position and connect to a

standard pressure source (see Mounting, page A-5).

2. If the zero indication is incorrect, remove the bezel/lens assembly and

re-adjust as described in Zero Check/Adjustment, page 7.

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

Indicator

Calibration, page 11).

4. Reverify the zero indication is correct. If it is not, repeat step 2.

Pointer Installation and Removal

During adjustment and calibration of the unit, it may be necessary to remove

and reinstall the pointer. Use the following procedures as required.

Pointer Installation

1. Position the pointer on the movement shaft with the pointer set at zero

scale. Obtain 75% to 90% pointer hub engagement on the movement

pinion shaft. The pinion shaft must not extend through the pointer hub.

It may be necessary to enlarge the hub hole, using a tapered broach (in-

cluded in the calibration toolkit, Part No. 9A-0288-1032B).

perpendicular blows to avoid bending the shaft.

3. Check the calibration of the indicator over its entire range.

4. Test the pointer for tightness by moving the pointer from the zero to the

50% position manually, and then letting the pointer return freely to zero.

If the pointer indicates ashift, tap the pointer hub to tightenit to the shaft.

Pointer Removal

The pointer is removed with a pointer puller shown in Figure 3.2. This tool is

included in the calibration toolkit, Part No. 9A-0288-1032B.

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Model 227A Dierential Pressure Indicator Section 3

1. Slide the pointer puller along the pointer until the pin protruding from the

tip of the screw in the pointer puller is directly over the movement shaft

and the arms of the pointer puller are directly under the pointer.

2. Gently turn the knurled head of the screw clockwise, pushing the pin

against the movement shaft and lifting the pointer with the arms. Finger

required, an Allen wrench (inserted into head of the screw) can be used.

However, care should be exercised to avoid breaking the pin.

HUB

MOVEMENT SHAFT

POINTER

HUB

POINTER PULLER

Figure 3.2—Pointer puller

Indicator Calibration

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

sembly is replaced.

IMPORTANT: Review all procedures, WARNINGS/NOTICES in Appendix A BEFORE

performing this procedure.

1. Securely mount the instrument in an approximately level position and

connect the DPU, as described in Mounting, page A-5.

2. Remove the bezel/lens assembly.

3. Align the linkage between the drive arm and the movement at 50% dif-

ferential pressure (DP) as shown in Figure 3.3, page 12 (Universal) and

Figure 3.4, page 12

without binding.

4. Check the pointer for zero indication. If necessary, set the pointer to zero

by slipping the pointer on the hub. (see Zero Check/Adjustment, page 7).

5. Apply 100% DP. If pointer exceeds 100% on scale, lengthen the range

arm by adjusting the range adjust screw with a 1/8-in. open-end wrench.

6. Release pressure. Set the pointer to zero (see Zero Check/Adjustment,

page 7).

7. Check the pointer for zero indication. If necessary, set the pointer to zero

by slipping the pointer on the hub. (see Zero Check/Adjustment, page 7).

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