ITT Controls Barton Nuclear 227A User manual

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).
2.
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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Section 3 Model 227A Dierential Pressure Indicator
Figure 3.3—Universal range/linearity adjustment (50% DP)
Figure 3.4—Inverted range/linearity adjustment (50% DP)
1/8” WRENCH
(PN 9A-0163-0044C)
CLAMP SCREW
DRIVE ARM
LINK
SINTERED
CLAMP BLOCK
TO TIGHTEN
.03 (approx)
M224
SHAFT
Figure 3.5—Drive arm to torque tube connection

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Model 227A Dierential Pressure Indicator Section 3
8. 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.
9. Release pressure. Set the pointer to zero (refer to Zero Check/Adjust-
ment, page 7).
10. Repeat steps 4 and 5, as necessary, to obtain the correct zero/full-scale.
11. Apply 50% DP. If the pointer indicates 50%, proceed to step 9. If the
pointer does not indicate 50% scale, adjust linearity as follows.
a. Loosen the drive arm screw (Figure 3.5, page 12) and move the arm
to shift the pointer in the direction of the error a distance of about 10
times the linearity error.
b. Check to see that the drive arm clears the end of torque-tube housing
by approximately 0.030 in. before retightening the drive arm screw
to prevent interference.
c. While supporting the block/shaft, tighten clamp screw until snug to
shaft.
d. Still supporting block/shaft, tighten clamp screw an additional 1/3
to 1/2 turn. (This screw can normally turn one full revolution before
breaking.)
e. Perform the Drive Arm Tightness Test described on page 14.
9. Release pressure and reset the pointer at zero. Check the span. If the gear
in the movement reaches a limit of travel as a result of linearity adjust-
ment (step 7), slip the range arm along the gear approximately 5 degrees
from the normal 37.5 degree angle to approximately 43 degrees (see
step 2). The range arm is slipped by applying pressure to the range arm
response at 50%, 0%, and 100% of full-scale differential pressure, and
adjust the linkage until the readings are acceptable.
10. Apply 0%, 25%, 50%, 75%, 100%, 75%, 50%, 25%, and 0% of full-scale
differential pressure consecutively to the instrument without overshoot.
Lightly tap the indicator to overcome friction. The pointer should accu-
rately indicate each applied pressure.
11. Test the instrument repeatability by applying 0%, 50%, 0%, 50% of full-
scale differential pressure. The indicator should accurately indicate each
applied pressure.
12. Set the drive arm stop to prevent the pointer from striking the snubbers
on the scale. (See Drive Arm Stop Adjustment, page 14.)
13. Test the pointer for tightness per the pointer installation instructions on
page 10.
14. If the drive arm screw has been loosened, verify that it is adequately tight
by performing the Drive Arm Tightness Test described on page 14.
15. Reassemble the unit per the cover installation instructions on page 9.

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Section 3 Model 227A Dierential Pressure Indicator
Drive Arm Tightness Test
This procedure tests the tightness of the drive arm's connection to the torque
should be taken to apply pressure slowly, as torque is being applied to the
connection through the torque tube drive shaft.
1. With the pointer at normal 0% torque tube rotation position (0% on a
normal 0 to 100% scale unit), adjust the drive arm stop bracket (or use
alternate means) to prevent the pointer from moving (stop bracket inter-
feres with drive arm movement).
IMPORTANT: On reverse acting/split range units, it will be necessary to pressurize the
DPU to move the pointer to maximum minimum scale position, and on
suppressed units, it will be necessary to apply pressure to establish a
reference point to check for "zero" shift.
2. Pressurize the DPU to full calibrated scale DP (100%of full scale range)to
achieve 8 degreesoftorque tube equivalent torque onto the connection.
3. Observe the shift in the unit "zero" following DPU depressurization (as
required) and drive arm stop bracket readjusting (to allow free move-
ment of drive arm and pointer). A downscale (counter-clockwise) shift in
"zero" of greater than 1/2% is indicative of drive arm slippage, necessi-
tating further clamp block tightening.
Drive Arm Stop Adjustment
1.
pointer against the full range stop snubber on the scale plate.
2. Slide the upper drive arm stop bracket against the drive arm and tighten
the drive arm stop bracket screw.
3.
pointer against the zero stop snubber on the scale plate.
4. Bend the zero drive arm stop against the drive arm.
5. Verify calibration as applicable.
Troubleshooting
Linkage
If the linkage is dragging or dirty, adjust the linkage or clean it.
Pointer
If the pointer drags on the scale plate, adjust the pointer position.
DPU
For troubleshooting tips related to the DPU, see Table A.3, page A-15.

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Model 227A Dierential Pressure Indicator Section 4
Section 4—Assembly Drawings and Parts Lists
Figure 4.1—Model 227A indicator, universal design

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Section 4 Model 227A Dierential Pressure Indicator
Figure 4.2—Model 227A indicator, inverted design

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Model 227A Dierential Pressure Indicator Section 4
Table 4.1—Parts List, Model 227A Indicator
Item Description Part No. Per Unit
1 Case
Universal 9A-C0227-0014C 1
Inverted 9A-C0227-1028C
2 Bezel (Part of Item #20) 9A-C0277-0029C 1
3 Lens (Part of Item #20) 9A-C0181-0038C 1
4* Gasket (Part of Item #20) 9A-C0277-0026C 1
5** Scale Plate
White on Black Background (Universal) 9A-C0227-0013C 1
White on Black Background (Inverted) 9A-C0200-0051C
Black on White Background (Universal) 9A-C0227-1003C
Black on White Background (Inverted) 9A-C0200-1014C
6* Pointer Assembly, White 9A-C0288-0030B 1
Pointer Assembly, Black 9A-C0288-0031B
7 Movement Assembly 9A-C0288-0035B-N 1
8 Drive Arm Assembly 9A-C0226-0023B 1
9 Link Assembly 9A-C0226-0020B 1
10 Stop Bracket 9A-C0288-0028C 1
11 Screw, Bezel, SST 9A-C0181-0007C 3
12 Snubber 9A-C0226-0028C 2
13 Screw, Sl. Fil Hd., 4-40 X 3/16, SST 9A-C0114-0023J 4
14 Screw, Bd. Hd. 4-40 X 3/16, SST 9A-C0117-0012J 1
15 Washer, Split Lock, #4, SST 9A-C0003-0062K 2
16 Screw, Soc Flat, 10-32 X 1/2, SST
for Universal Indicator 9A-C0240-0019J 4
for Inverted Indicator 6
17 Spacer, Case to DPU 9A-C0224-1547C 1
18 Screw, Rd. Hd., 4-40 x 1/4, SST 9A-C0111-0034J 2
19 Washer, Flat, #4, SST 9A-C0003-0096K 1
* Recommended spare part
-
mation:
Square root or linear graduations,
Scale (e.g., 0-100, 25-0-100, etc.)
Number of graduations (linear scales only)
Data (e.g., PSI, bar, inches of water column, meter, etc.)
Additional Notes:
1.A/R indicates as required.
2.When ordering parts, specify serial number of instrument.
3. For 224 DPU parts, refer to Table A.4, page A-18.

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Section 4 Model 227A Dierential Pressure Indicator
Table 4.1—Parts List, Model 227A Indicator
Item Description Part No. Per Unit
20 Assembly, Bezel (Items 2, 3, & 4) 9A-C0277-0018B -
21 Bezel Stud 9A-C0004-0005K 1
22 Disc Sealer 9A-C0192-1035T 1
23 O-Ring, Case Seal, Viton 2-111 9A-C0001-1057R 1
24 Sealing Compound, RTV 103 9A-C0006-1001V A/R
Differential Pressure Unit (DPU) (not shown) See Appendix A 1
* Calibration Kit (not shown) 9A-0288-1032B A/R
* Recommended spare part
-
mation:
Square root or linear graduations,
Scale (e.g., 0-100, 25-0-100, etc.)
Number of graduations (linear scales only)
Data (e.g., PSI, bar, inches of water column, meter, etc.)
Additional Notes:
1.A/R indicates as required.
2.When ordering parts, specify serial number of instrument.
3. For 224 DPU parts, refer to Table A.4, page A-18.

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Model 227A Dierential Pressure Indicator Section 4
Figure 4.3—Model 227A indicator, SST case