Barton 200A Manuale utente
MODELS 200A/227A/227C
DIFFERENTIAL PRESSURE INDICATOR
200A use 199 DPU
227A uses 224 DPU
227C uses 224C DPU
Installation Manual
Version 03D77d
ID#10055
4/2003
CONTENTS
Section 1 - Introduction .......................................................... Page 3
1-1. General....................................................................... Page 3
1-2. Main Components ....................................................... Page 3
1-3. Indicator Specications................................................. Page 3
1-4. Theory of Operation .................................................... Page 3
Section 2 - Installation ............................................................ Page 5
Section 3 - Maintenance ......................................................... Page 7
3-1. Required Tools............................................................. Page 7
3-2. DPU Test/Calibration/Maintenance Equipment .............. Page 7
3-3. Bezel and Lens Installation and Removal ........................ Page 7
3-4. Calibration Check ........................................................ Page 7
3-5. Pointer Installation and Removal ................................... Page 8
3-6. Complete Calibration ................................................... Page 8
3-7. Overrange Stop Adjustment.......................................... Page 9
3-8. DPU Maintenance........................................................ Page 10
3-9. Locking Drive Arm to Torque Tube ............................... Page 10
3-10. Troubleshooting ......................................................... Page 11
Section 4 - Parts Drawing/List ................................................ Page 12
4-1. Model 200A................................................................ Page 12
Figure 4-1. 200A Parts Drawing ....................................... Page 12
Table 4-1. 200A Parts List................................................ Page 13
4-2. Models 227A and 227C............................................... Page 14
Figure 4-2. 227A/227C Parts Drawing............................. Page 14
Table 4-2. 227A/227C Parts List ..................................... Page 15
Section 5 - Installation Drawings.............................................. Page 16
5-1. 200A (0200-09043) .................................................... Page 16/17
5-2. 227A (0227-09013) Standard ...................................... Page 18/19
5-3. 227A (0227-09033) 500 psi Brass ............................... Page 20/21
5-4. 227C (227C-10013).................................................... Page 22/23
[This manual is for the Indicator only - before installing or
operating this instrument, refer to the separate DPU manual that is
appropriate for the instrument model listed above.]
Model 200A
Model 227A
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PRODUCT WARRANTY STATEMENT
The product warranty applicable to this Barton instrument is as stated on the back (last
page) of this manual. NOTICE: The warranty of this instrument and the associated DPU
will be voided if the following limitations are exceeded:
Temperature - Do not subject the DPU to temperatures above 200°F or below -60°F
(35°F minimum for water lled units).
Pressure - Do not subject the DPU to operating pressures in excess of the working pres-
sure rating stamped on the unit or on the attached dataplate.
Corrosion - Do not subject the DPU to incompatible process media.
Sealed Components - Do not loosen or remove the torque tube gland nut, the drive
arm hole plug, or the torque tube housing from the centerplate. To do so will cause loss of
bellows ll uid and render the unit inoperable.
Vibration - Do not subject the DPU to severe mechanical shock.
Shock - Do not subject the DPU to hydraulic shock.
Pulsation - Do not subject the DPU to severe pulsation.
Should any after-delivery problems arise, please contact Barton Customer Service depart-
ment during normal business hours at (626) 961-2547. In Europe, contact Barton Instru-
ment Systems, Ltd. (3 Steyning Way, Bognor Regis, West Sussex, P022 0TT, England) at
44-1243-826741.
SAFETY
Before installing this instrument, become familiar with the installation instructions
in Section 2 and in the separate DPU manual.
DANGER notes indicate the presence of a hazard which will cause severe
personal injury, death, or substantial property damage if warning is ignored.
WARNING notes indicate the presence of a hazard which can cause severe
personal injury, death, or substantial property damage if warning is ignored.
CAUTION notes indicate the presence of a hazard which will or can cause
moderate personal injury or property damage if warning is ignored.
DANGER, WARNING, and/or CAUTION notes that appear on the following pages
of this manual should be reviewed before proceeding: None. (Important! Before
installing or operating this instrument, review all safety notices contained in
the separate DPU manual that is appropriate for the instrument model.)
RECORD OF CHANGES
CHANGE
NO.
DATE DESCRIPTION
200A Manual (Previous Versions)
93I1 2/93 pg.1-3, 2-1/8" DP range changed from 0-75 psi to 0-100 psi;
Added ref. to bezel glass to Fig. 5-1.;Table 5-1 (items 17 & 19)
98F9 6/98 Rev. Name/Logo; drawing# pg. 6-1 and drawing pg. 6-2.
227A/227C (Previous Versions)
90K4 11/90 Reformatted document
92E2 5/92 Revised parts list (Table 5-1) - Items 11 & 14
Combined 200A/227A/227C Manual (Replaces IDs: 10050, 10120, & 10121
03D77d 4/03 Combined 200 & 227 manuals; booklet format; removed DPU
specic information/appendixes - refer to separate DPU manual.
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SECTION 1 - INTRODUCTION
1-1. General
The Barton Models 200A and 227A/C measure differential pressure, uid ow
rate, or liquid level. For uid ow measurements, the indicator is connected
by piping to the low- and high-pressure sides of a primary device (e.g., orice
plates, venturis, or ow tubes) located in the process run. For liquid level appli-
cations, variations in the level of the liquid within the process vessel produce
changes in differential pressure used to indicate the liquid height.
The indicating pointer travels through a 270 degree arc over a six-inch diameter
scale. The movement has a micrometer screw for range adjustment. Pointer hub
adjustment can be made without removing the scale plate or pointer. Range and
linearity adjustments are accessible after removal of the scale plate.
1-2. Main Components
The 200A consists of two major components: an actuating unit (DPU) and the
case enclosed indicating instrument.
A. Actuating Unit (DPU) - 200A uses 199 DPU, 227A uses a 224 DPU, and
227C uses a 224C DPU. For detailed information on the actuating DPU,
see the appropriate (separate) DPU manual.
B. Indicator
1-3. Indicator Specications
Accuracy:
0-10" w.c. to 0-349" w.c.
(255 mm to 890 m) ............ ±1/2% of full scale DP
0-350" w.c. to 0-100 psi
(890 m to 6.7 bar) ............... ±3/4% of full scale DP
Temperature Limits ................. -40°F/°C to +180°F (+80°C);
+35°F to +180°F (+1°C to +80°C)
for water lled units
Dimensions............................. per model number and housing rating. See
ODD Drawings in Section 5.
1-4. Theory of Operation
The bellows within the DPU moves in response to changes in the DP monitored
at the high and low pressure sides of the primary device installed in the process
run. The DPU bellows movement is mechanically transferred to the indicator
mechanism through a rotating torque tube shaft. As the torque tube rotates, the
drive arm transmits the motion through the connecting link to the indicating
pointer. The pointer travels through a 270 degree arc to indicate measurement
on the 6-inch scale plate.
The 6-inch scale can be printed as required, in uniform increments for DP, SP,
or liquid height or in square-root increments for direct ow measurements. Spe-
cial scales can be furnished to indicate the amount of liquid in a tank.
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(Blank Page)
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SECTION 2 - INSTALLATION
2-1. 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.
2-2. Mounting/Piping/DPU Installation
Refer to the appropriate (separate) DPU Manual for the instrument model being
installed.
NOTICE: Do not turn instrument by grasping the instrument case - this can
result in damage to the case. Always thread pipe into instrument.
2-3. Startup
For startup procedures, warning notices, and information, refer to the sepa-
rate DPU Manual that is appropriate for the instrument model being installed.
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(Blank Page)
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3-1. Required Tools
Tool Purpose
Pointer puller Pointer removal
Small screwdriver Calibration adjustments
Medium screwdriver Bezel removal/DPU bracket screws
Spanner wrench
(p/n 0163-0005B) DPU Range screw adjustment
1/8" Open-end wrench Calibration adjustments
3-2. DPU Test/Calibration/Maintenance Equipment
Refer to the appropriate (separate) DPU Manual.
3-3. Bezel and Lens Installation and Removal
Whenever the bezel/lens is installed, the bezel gasket (0277-0026C) must be
installed as shown below:
The two snubbers (0266-0028C) on the scaleplate should not be compressed
against the lens cover and the pointer should not touch the lens.
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.
3-4. Calibration Check
Normally all that is required to put indicator into service is to verify that it
remains at factory-set calibration by performing the following calibration check:
1. Securely mount indicating switch in an appropriately level position and con-
nect DPU to a standard pressure source, per appropriate DPU manual.
2. If zero indication is incorrect, remove bezel/lens and reset pointer to zero
by holding pointer with ngers and turning hub with a wrench. Replace
bezel/lens.
3. To test for reverse travel, connect pressure source to low-pressure housing
and vent high pressure housing. Apply pressures approximately 150% of
the differential pressure range. The pointer should move approximately 5%
to 10% below zero.
(Continued on next page...)
SECTION 3 - MAINTENANCE/CALIBRATION
To remove the bezel and
cover lens:
1. Loosen three screws
on the front of bezel.
2. Tilt out bottom of bezel
and slide bezel upward.
Figure 3-1. Bezel/Lens
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3-4. Calibration Check (Cont.)
4. To test for overtravel, connect pressure source to high-pressure housing
and vent low-pressure housing. Apply pressures approximately 150% of
differential pressure range. Pointer should move approximately 5% to 10%
above fullscale.
5. Apply 0%, 50% and 100% of full scale pressure. If indication is within
specied limits, instrument calibration is satisfactory and no adjustments are
necessary. If indications are incorrect, perform switch calibration procedure.
6. Make sure instrument zero indication is correct; otherwise, repeat Step 2.
3-5. Pointer Installation and Removal
During adjustment and calibration of the indicating switch, it will sometimes be
necessary to remove and reinstall the pointer, per the following procedures.
A. Pointer Installation
1. Position pointer on movement
shaft with pointer set at zero
scale. It may be necessary to
enlarge the hub hole, using a
tapered broach (included in the
toolkit (p/n 0288-1032B).
2. Lightly tap pointer hub with a
hand-set or other at-end tool.
Use perpendicular blows to
avoid bending shaft.
3. Check indicating switch for calibration over its entire range (refer
to Switch Calibration in this section). If indicating switch is correctly
calibrated, secure pointer to movement shaft by tapping hub with a
hand-set or other at-end tool.
B. Pointer Removal
Pointer is removed with Barton Pointer Puller (p/n 0163-0005B), which is
included in the toolkit (p/n 0288-1032B).
1. Slide pointer puller along pointer until pin protruding from tip of screw
in pointer puller is directly over movement shaft and arms of pointer
puller are directly under pointer.
2. Gently turn knurled head of screw clockwise, pushing pin against
movement shaft and lifting pointer with arms. Finger pressure should
be sufcient to pull the pointer free. If more pressure is required, an
Allen wrench (inserted into head of the screw) can be used. However,
care should be exercised: too much pressure can cause the pin to
break.
3-6. Complete Calibration (DP=Differential Pressure)
A complete calibration of the instrument is required whenever the DPU assem-
bly is replaced. Refer to the appropriate (separate) DPU manual before perform-
ing this calibration procedure.
1. Securely mount instrument in an approximately level position and
connect DPU into the test setup, as described in the appropriate (separate)
DPU manual.
(Continued on next page...)
Figure 3-2. Pointer Puller
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3-6. Complete Calibration (Cont.) (DP=Differential Pressure)
2. Attach linkage between drive arm and
movement. Fig. 3-3 shows alignment
at 50% DP. Inspect parts for straight-
ness and pivot-t without binding.
3. Set pointer at zero on scale by slip-
ping pointer on hub. Hold tip of
pointer and turn hub with wrench.
4. Apply 100% DP. If pointer exceeds
100% on scale,
lengthen range arm.
Remove pressure.
5. Set zero and span,
using hub for zero
adjustment and
range adjust screw
on the movement for span adjustments.
6. Apply 50% DP. If pointer does not indicate 50% scale, a linearity adjust-
ment is necessary. Loosen drive arm screw and move arm to shift pointer
in direction of error (approx. 10:1). Tighten drive arm screw.
7. Release pressure and reset pointer at zero. Check the span. If gear in move-
ment reaches limit of travel as a result of linearity adjustment (step 6), slip
range arm along gear approximately 5 degrees from normal 37.5 degree
angle to approximately 43 degrees. Range arm is slipped by applying pres-
sure to range arm with thumb, while holding gear rmly in place. Retest
pointer response at 50% and 100% DP, and adjust linkage until readings
are acceptable.
8. Apply 0%, 25%, 50%, 75%, 100%, 75%, 50%, 25%, and 0% of DP
consecutively to instrument without overshoot. Lightly tap indicator to over-
come friction. Pointer should accurately indicate each applied pressure.
10. Test instrument repeatability by applying 0%, 50%, 0%, 50% DP. Indicator
should accurately indicate each applied pressure.
11. Set overrange stops to prevent pointer from striking snubbers on scale. See
para. 3-7 (Overrange Stop Adjustment). Tighten all screws. Test setting by
manually moving pointer from zero position to 50%, then let the pointer
return freely. An off-set in zero reading indicates pointer slippage. If neces-
sary, tap pointer hub to tighten it to shaft.
3-7. Overrange Stop Adjustment
1. Apply sufcient pressure to the high pressure housing to deect the pointer
against the snubber on the scale plate. Slide the upper overrange stop
against the drive arm and tighten the overrange stop screw.
2. Apply sufcient pressure to the low pressure housing to deect the pointer
against the zero stop snubber on the scale plate. Slide the zero-stop against
the drive arm and tighten the zero-stop screw.
3. Remove the pointer and calibration scale. Replace the pointer at zero
(adjust zero as necessary). Replace the lens and bezel assembly.
Figure 3-3. Linkage at 50% DP
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3-8. DPU Maintenance
DPU inspection/cleaning/repair/service procedures, along with applicable
WARNING notices, are presented in the appropriate (separate) DPU manual.
3-9. Locking Drive Arm to Torque Tube
(Also see appropriate (separate) DPU manual.)
1. Slip drive arm over torque tube shaft; clear end of torque-tube housing by
approximately 0.030-inches before securing to prevent interference.
2. To tighten drive arm assembly onto torque-tube shaft:
a. While supporting block/shaft, tighten clamp screw until snug to shaft.
b. Still supporting block/shaft, tighten clamp screw an additional:
• Sintered: 1/3 to 1/2 turn (This screw can normally turn one full
revolution before breaking.)
• Slotted: 1/4 to 1/3 turn (The slot in the slotted clamp block should
still be open.)
Figure 3-9. Locking Drive Arm to Torque Tube
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