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232.34
Operating Manual
2 pgs251.35 Kb0
Specifications
2 pgs1.41 Mb0

WIKA 232.34, 233.34 Operating Manual

IX.ReplacementParts 4½” 6”
X.Warning
Pressure gauges must be selected and installed so that the possibility of failure resulting in injury or damage caused by misuse or misapplication is minimized. For correct selection and use of gauges, refer to ASME B40.1, which can be obtained from The American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016 - 5990. Important factors for proper gauge selection are:
Process: Wetted parts must be compatible with the measured media.
Pressure: The range of the gauge should generally be twice the working pressure. The working pressure in all
cases should be limited to 75% of the gauge range. Where alternating pressure and pulsation are encountered, working pressure should be limited to 2/3 of the gauge range.
Pulsation/Vibration: Pressure pulsation and vibration could result in fatigue failure of the measuring system. Therefore, dampening provisions such as liquid filling of the gauge, installing flow restricting devices or isolating from the vibration source should be considered.
Temperature: Excessive temperature exposure may result in damage to the measuring system and/or gauge outer parts, case, gasket, and window. Preventive temperature lowering devices such as the WIKA cooling ele­ment or a pigtail siphon should be considered.
LiquidFill: Be sure that the filling liquid can safely mix with the process fluid.
®
) (0.6 mm I.D.) 0607797 0607797
Operating&Installation
Instructions
XSELTMProcessGauge
Type2XX.34
SIZE4½"&6"SOLIDFRONT
WIKAInstrumentCorporation
1000 Wiegand Boulevard
Lawrenceville, Georgia 30043-5868
1-888-WIKA USA, (770) 513-8200 (in Georgia)
FAX (770) 338-5118
http://www.wika.com
In keeping with and for purposes of product improvement,
WIKA reserves the right to make design changes without notice.
Instruction Sheet – 03/10 P/N 2207290 Rev 5 Instruction Sheet available at http://www.wika.com
Revision Date: March 1, 2010
R
I.General
WIKA gauges are designed and built to deliver long and reliable service under conditions of severe stress. For inquiries concerning gauge selection and operation, the American Society of Mechani­cal Engineers specification ASME B40.100 should be consulted. Additional information can be obtained from WIKA Instrument Corporation, Lawrenceville, Geor­gia, or from any authorized WIKA distributor.
II.Installation
Gauges should always be mounted by using the wrench flats (squares) provided on the pressure con­nection. Under no circumstances should the pressure connection be tightened by applying force to the gauge case.
It is preferable to mount gauges in a location free of mechanical vibra­tion. If this is not possible, a liquid filled gauge or a flexible tube con­nection may be necessary.
The gauge should be located so that it is not exposed to abnormally low or high temperatures. This may cause an additional temperature error, depending on the deviation from the reference temperature of 73°F (23°C). For steam service, the gauge must be protected by a water-filled siphon.
If severe pulsation is present, the gauge should be equipped with a properly sized orifice restrictor.
III.Maintenance
All gauges should be checked reg­ularly for wear and tear, accuracy, and proper functioning by compar­ing them to a precision test gauge or a dead weight tester. Replace all broken or damaged parts im­mediately.
IV.Disassembly
Tools Needed
- Bench vise
- Flat head screwdriver
- Threaded Ring Tool: WIKA p/n 1031589 (4.5”); 2206226 (6”)
- Pointer Puller Tool: WIKA p/n 9091823
- Pointer Puller Handle: WIKA p/n 2246954
- Arbor Press: WIKA p/n 1325116
- Press Plate: WIKA p/n 1410946
NOTE: WIKA has developed spe­cial service tools which make
gauge repair and conversion much easier. Tools are available from WIKA or your local distributor for a nominal charge.
1.ThreadedRingRemoval
Place the gauge into the bench vise face-up by clamping the con­nection (gauge stem) firmly on the wrench's flat sides.
FIG. 1
Seat the Threaded Ring Tool into the ring between the tightening notches. Insert the screwdriver into the Threaded Ring Tool for better leverage, and loosen the threaded ring counterclockwise. You can unscrew the ring once it is loose by using the Threaded Ring Tool without the screwdriver.
2.WindowRemoval
If the window sticks to the o-ring and will not come out, you will have to remove the blow-out back. See step 3.
There is an overflow hole located on the "solid front" wall on the gauge at the 12 o'clock position. Insert a small screwdriver into
FIG. 2
this hole, and carefully push the window out.
3.Blow-outBackRemoval To remove the blow-out back, you will need a bench vise and a screwdriver. Before starting, look at the back of the gauge. Please note the two small openings next to the two upper snap-in tabs in the blow-out back.
Insert the screwdriver into the opening and pry out the tab (Fig.
3). Repeat this step on the other side and the blow-out back will pop out.
4.PointerRemoval
To remove the adjustable pointer you will need to use the Pointer Puller Tool (WIKA p/n 9091823) and Pointer Puller Handle (WIKA p/n 2246954). Remove the tip of
FIG. 3
the Pointer Puller Handle so that it functions similar to that of pli­ers. Insert the tip of the Pointer Puller Handle into the center of the pointer. Then insert the notch of the Pointer Puller Tool between the pointer shaft and the other end above the Pointer Puller Handle. Squeeze gently on the Pointer Puller Tool and the adjustable pointer should pop upward.
5.DialRemoval
To remove the dial, you will need a small flat head screw driver. On both sides of the pointer shaft there are two small screws. Re­move both of these screws and the dial can then be lifted straight up from the case.
6.DialRotation To rotate the dial on the gauge, remove both screws on each side of the pointer shaft. Rotate the dial in increments of 90 degrees until you reach the desired position. Line up the holes of the dial with those of the case and then insert the screws and tighten.
7.RestrictorRemoval&Cleaning
To remove the restrictor, insert a small flat headed screwdriver into the bottom center of the socket. Turn the restrictor counterclock­wise to loosen and remove. To clean debris from the restrictor, push a thin metal wire through one end until it protrudes out the other side. If this is not possible, the restrictor should be replaced. See "Replacement Parts" for restrictor material and part number.
V.Assembly
1.DialAssembly
To assemble the dial, place it back into the case in the same position as it was originally removed. Line up the screw holes of the dial and case. Place the screws into the holes and tighten.
2.PointerAssemblyand Adjustment
To install the pointer, gently place the pointer onto the shaft. Rotate the pointer until the tip is exactly on zero. Lightly tap the center of the pointer with the end of a screw driver to secure the pointer to the shaft. If, after installing the pointer, it is not exactly on zero, there is an adjustment screw located on the pointer. While gen­tly holding the pointer, turn the adjustment screw clockwise to increase pressure or counter­clockwise to decrease pressure until the pointer tip is exactly on the zero mark.
3.ThreadedRingAssembly
First make sure the O-ring is prop­erly seated in the groove located just below the window thread rings. Place the window such that the flat side comes in contact with the O-ring and the window mold mark circle in the 6 o'clock posi­tion. Then place the threaded ring on the gauge and turn it in a clock­wise direction until the threaded ring comes in contact with the grooved part of the window. The threaded ring tabs should face up. The threaded should turn easily without binding. If you encounter resistance before the threaded ring touches the window, the threaded ring has not been seated correctly. Unscrew the threaded ring and re­peat the step above. You can use the Threaded Ring tool to hand thighten the threaded ring. To seat it firmly, insert a screwdriver in the Threaded Ring Tool and tighten the threaded ring by one-quarter turn with 16 ft.-lbs of torque.
4.Blow-OutBackAssembly
First make sure the o-ring or mem­brane (for liquid filling) is seated properly on the blow-out back (lubricate the sealing surface of the case or membrane with glyc­erine or silicone when installing a membrane). Engage the two large tabs near the base of the gauge and press the back down with your hands. Place the gauge in the Arbor Press (p/n 1325116) and align it underneath the press plate (WIKA p/n 1205838). Press the blow-out back onto the case until all four tabs are engaged and the blowout back is flush with the rear of the case.
5.RestrictorAssembly A restrictor is recommended for all applications that will encounter pressure surges, pulsations or fluc­tuations. To install a restrictor, locate the bottom center of the socket where you will notice a threaded bore. Place the pointed end of the threaded restrictor into the bore and turn clockwise until tight using a small flat headed screw­driver. Once tight, hand torque the restrictor with 0.5 to 1.0 ft.-lbs of torque to ensure it will not come loose during operation.
VI.PreparedforLiquidFilling
Effective July 2007 all Lower Mount (LM) process gauges will come equipped with a membrane so the gauge can be field-filled without the addition of extra parts. All process gauges prepared for liquid filling will have printed on the warning label “MEMBRANE IN­STALLED FOR LIQUID FILLING”. For all Lower Back Mount (LBM) process gauges the membrane (WIKA p/n 1654250) needs to be installed to convert to a liquid-filled gauge.
VII.Liquid-FilledConversion To convert process gauges manu­factured prior to July 2007 and all Lower Back Mount (LBM) process gauges to the liquid-filled case, the membrane will need to be in­stalled. First remove the blow-out back as described in Section IV, Item 3 (Blow-Out Back Removal). Then replace the o-ring with the membrane (WIKA p/n 1053019). Lubricate the case or membrane sealing surface with glycerine or silicone. Then press the blow-out back into the case as described in Section V, Item 4, (Blow-Out Back Assembly).
FIG. 4
VIII.LiquidFillingOfDryCase For gauges with pressure ranges of 60 psi or less, the pointer must be pre-adjusted before liquid fill­ing. To adjust the pointer, use the adjustment screw on the pointer as described in Section V, Item 2 (Pointer Assembly and Adjust­ment). Follow Fig. 4 in order to compensate for the liquid fill.
Note that for the -30” Hg, set the pointer above zero. For all other ranges, set the pointer below zero by the amount shown in Fig. 4.
Remove the filling plug from the top of the gauge (12 o'clock) with a small screwdriver. Turn the gauge over onto its face. On the back cover of the gauge, you will see a small vent hole on the blow-out back (Fig. 5). If you have the liquid filling kit, use the vent plug pro­vided with the kit to close the vent hole. If you do not have the kit, you can seal the hole with a piece of tape or cover it with your finger while filling. This allows the mem­brane to maintain an air–pocket which will help alleviate tempera­ture induced zero shifts.
FIG. 5
Fill the gauge with the correct fluid for your application using a small funnel or tube. The gauge must be filled in an upright position. Be careful not to touch the Bourdon tube, as this may cause a shift in the gauge calibration. The fluid level should be as full as possible
Once you have the correct fluid level, clean the area around the filling hole, and insert the filling plug. Make sure the plug is seated squarely. Next, remove the vent plug or object used to block the vent hole located on the blow-out back. The final step is to check the zero position of the pointer. If the pointer is not within the tolerance field of the zero mark, the pointer must be readjusted. To do this, drain the gauge, reversing the steps above, adjust the pointer and then repeat the procedure from the start.
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