Pipeline Strainers

AddendumMid-West Instrument Model 120

Bulletin MN03018A3

MANUAL ADDENDUM

The following information is an addendum to Bulletin MN03018: Pipeline Strainers Installation/Operation Manual. This reference material is regarding installation and operating instructions for the Mid-West Model 120 Differential Pressure Switch, their Bulletin No. IM 120/92.

Inspection

Before installation, check the nameplate on each instru-ment against the receiving paperwork and the intended application for correct part number, materials of con-struction, working pressure, dial range, etc. If equipped with switches, check electrical rating, type of enclosure, etc. Inspect for shipping damage and, if damaged, report it immediately.NOTE: Before attempting repairs, contact your local Mid-West Representative or our factory. Failure to do so will void any warranty.

Product Description

The Model 120 "Filter Minder®" is a rugged, medium-range differential pressure instrument available as a switch, a gauge, or both. See "Part Numbering Sys-tem", for available options.Differential pressure is sensed by the movement of a floating piston magnet against a calibrated spring. The magnetically coupled gauge pointer outside the pres-sure housing follows the movement of the piston mag-net and indicates differential pressure on the dial scale.When equipped with switches, a contact is made or broken by the magnetic field of the piston magnet.The unit provides full over-range protection to the rated working pressure of the housing in either direction.The precise piston/bore fit allows minimal leakage from high to low sides. This leakage is only 5 to 15 SCFH air at ambient conditions and a pressure differential of 100 PSID.

Installation

Model 120 "Filter Minder®" is calibrated and tested prior to shipment and is ready for immediate installation. Use of the following installation procedures should eliminate potential damage and provide optimum trouble-free operation.

1. Connections1/4" FNPT are provided as standard but check paper-work for connections ordered. There are two connec-tions on the housing identified as "hi" and "lo" for high pressure and low pressure (Fig. 6). Be sure these get plumbed to the proper connections on your system. Improper connection will not damage the instrument, but it will not function properly. Flexible tubing is rec-ommended to minimize the effect of any vibration that may exist.

2. Instrument LocationOn liquid service the instrument should be mounted below the process connections to facilitate self-bleeding. On gas service it should be located above the process connections to promote self-draining. If the process contains particulates, a "pigtail" loop or drop leg (ma-nometer "U-tube" configuration) in the tubing will miniize the possibility of it migrating into the instrument.

3. Panel MountingGauges with 2-1/2" dials can only be mounted through the rear of the panel. Make the proper panel cutout as indicated in (Fig. 4). Remove the (4) bezel screws. Insert the gauge front through the rear of the panel and reinstall the bezel screws through the front of the panel and into the gauge bezel. Tighten the screws securely, alternating in a diagonal pattern.

92

Gauges with 4-1/2" dials should be mounted from the front of the panel. Make the cutouts as indicated in (Fig. 4). Insert the (4) panel mounting studs, finger tight, into the metal inserts located in the rear of the bezel. Insert the gauge through the panel, aligning the panel mount-ing studs with the holes in the panel. Install the (4) #8-32 nuts onto the studs and tighten securely.

4. Pipe MountingAn optional pipe mounting kit is available for mounting the gauge to a 2" vertical or horizontal pipe (Fig. 8).

5. ElectricalIf ordered with switch(es) your "Filter Minder®") will have one or two SPDT (single pole, double throw) "reed" switches rates at 0.25 amps, 3 watts at 125 volts AC/DC continuous. The 3 wire reed switch(es) provides a normally open or normally closed function and is adjust-able from 10 to 90% of full scale (Fig. 1).For loads above the switch rating, Mid-West Power Relay 1000TR (Fig. 2) or an equivalent relay should be used. The Model 1000TR is mounted on a standard 4 inch square junction box cover and can control loads to 10 amps. (Fig. 2).The standard switch enclosure is weather-resistant with a rubber grommet providing a seal around the wires. The switch enclosure is mounted on the bottom (and tip if two switches are installed). (Fig. 3).A weather-proof version is available with the wires ex-tending from a 1/4" FNPT conduit connection in the rear center of the body. (Fig. 3).To make the electrical connections for either of these units consult the wiring diagram. (Fig. 1).A switch-adjusting screw is provided in the end of the enclosure. Do not use excessive force when rotating the adjusting screw or the adjustment mechanism may be damaged.

Figure 1 Figure 2

NEMA 4X (WEATHER-PROOF) ENCLOSURE

The gauge and switch(es) are mounted inside the en-closure with the switch(es) wired to a terminal strip. An opening is provided on the bottom of the enclosure for a 1/2" flexible cable or conduit connector. Remove the cover from the enclosure by loosening the (4) screws. Insert wires through an appropriate weather-proof con-nector into the enclosure and connect to the terminal strip. Refer to the terminal strip wiring diagram inside the cover. Reinstall the cover and (4) screws. (Fig. 5).Note:Any modifications to the weather-proofhousingvoidsallwarranties.

NEMA 7 (EXPLOSION-PROOF) ENCLOSURE

Warning: The cover and/or switch-adjust accessplugsmustneverberemovedwhenthereispowertotheunit.The gauge and switch(es) are mounted inside the en-closure (Fig. 7). A 1/2"-14 FNPT conduit connection is provided in bottom side of the enclosure. A proper explosion-proof dust-tight sealing fitting together with appropriate sealing cement must be used when mak-ing connections to the wire leads provided.Caution:Removalof the instrumentor anyhard-ware (except the cover and/or switch-adjust ac-cess plugs) voids all warranties and conformance to any standards.

SWITCH SETPOINT ADJUSTMENT

Warning:Switch-adjustaccessplugscanonlyberemovedandswitchadjustmentsmadewith theunit unpowered on nema 7 (explosion-proof) units (Fig. 7).If adjustment is required, remove switch-adjustment access plug(s). Insert screw driver through the hole and into the switch-adjustment slot. Rotate until the de-sired set point is reached. Do not use excessive force or the adjustment mechanism may be damaged. Rein-stall the access plug(s).

TROUBLE SHOOTING

1. Gaugedoesnotindicatedifferential. A. Check for proper hook up, high to "hi" and low to "lo". B. Ensure certain block valves are open and, if using a 3-valve manifold, that the equalizer (balance) valve is closed. C. If A & B check out correctly, loosen or disconnect the high pressure line to determine if there is pressure to the instrument. D. If there is pressure to the instrument, check to determine that there is differential across the unit being monitored. If so, contact the factory for assistance and/or an "RGA" (return goods authorization) number to return the instrument for repair or replacement.

2. Switch(es)doesn'tfunction. A. Make certain that the switch load does not exceed the switch rating of 0.25 amps. If the load exceeds 0.25 amps, the switch has probably been burned out. Do a continuity check to confirm switch condition. B. If continuity check indicates no damage, check that all connections are properly and securely made. C. If A & B check out properly, refer to 1,D. for instructions.

Figure 3

Note: 1.Drawingsshownominaldimensions(nottoscale). 2.Dimensionsshowninparenthesesareinmillimeters. 3.Manufacturerreservestherighttochangespecificationswithoutpriornotice.

Model1202-1/2InchDial(Std.)

Figure 4

Supplementary120Dimensional/MountingData

Figure 6

NEMA4XEnclosures(2-1/2InchDial

4-1/2InchDial

Figure 5

Explosion-Proof Enclosure Class I, Groups D, Class II, Groups E, F & G.

2-1/2InchDial

Figure 7

4-1/2InchDial

Typical2"PipeMounting–WeatherProof/ExplosionProofModels

Figure 8

Typical 2" Pipe Mounting (Back Connections Only)

TypicalWallMounting4-1/2"Dial(BackorEndConnections)

TypicalWallMounting2-1/2"Dial(EndConnectionOptionOnly)

StandardModelNumberandSpecification120-AA-00-OO 6000 P.S.I.G. Working Pressure Aluminum Body, Stainless Steel Piston, Ceramic Magnets, Buna N Seals, 2-1/2" Engineering Plastic Case with Shatter-Resistant Lens, 1/4" FNPT Back Connections. Accuracy ±3-2-3% Full Scale (Ascending).

Part Numbering System

1 2 0 A A– – 0 0 O O–

Basic Model Number1

2 MaterialA. Aluminum (STD) S. 316 Stainless Steel Z. Special Dial SizeA. 2-1/2" Round Uni-directional Dial (STD) B. 2-1/2" Round Bi-directional Dial C. 4-1/2" Round Uni-directional Dial D. 4-1/2" Round Bi-directional Dial Z. Special

Seals0. Buna N (STD) 1. Viton 2. Neoprene 5. Ethylene Propylene 6. Perfluoroelastomer 9. Special

3

4

ElectricalO. None (STD) A. (1) Switch, Standard Enclosure with Grommet Wire Seal B. (2) Switches, Standard Enclosure with Grommet Wire SealC. (1) Switch with 1/4" Conduit Conn.D. (2) Switches with 1/4" Conduit Conn.G. (1) Switch in NEMA 4X Plastic EnclosureH. (2) Switches in NEMA 4X Plastic EnclosureJ. (1) Switch in Exp. Proof Enclosure C.S.A. ListedK. (2) Switches in Exp. Proof Enclosure C.S.A. ListedZ. Special OptionsQ.None (STD) F. Pipe Mounting Kit (Back Conn. Only) L. Liquid Filled Dial Chamber Only M. Max. Indicator Follower Pointer T. DP Switch Only Without IndicatorW. Wall Mount (2-1/2" or 4-1/2" dial)Z. Special

Connections0. 1/4" FNPT Back Conn's. (STD) 1. 1/4" FNPT Back Conn's. Reversed 2. 1/4" FNPT End Conn's. 3. 1/4" FNPT End Conn's. Reversed (N/A in NEMA 4X and NEMA 7) 9. Special

Note: All option combinations may not be available. Contact factory for details.

Manufacturer reserves the right to change specifications without prior notice.

7

6

5

Literature can be obtained from TechnipFMC Measurement Solutions Literature Fulfillment at measurement.fulfillment@technipfmc.com or online at www.fmctechnologies.com/measurementsolutions.

When requesting literature from Literature Fulfillment, please reference the appropriate bulletin number and title.

Contact Information: Field Service Response Center 24/7 Technical Support/Schedule a Technician: 1-844-798-3819 System Installation Supervision, Start-Up, Training, and Commissioning Services Available

TechnicalSupport

TechnipFMC.com© 2019 TechnipFMC plc. All rights reserved. MN03018A3

TechnipFMCFMC Technologies Measurement Solutions, Inc.13460 Lockwood RoadBuilding S01Houston, Texas 77044 USAP:+1 281.260.4000

USA Operation 1602 Wagner AvenueErie, Pennsylvania 16510 USAP:+1 814.898.5000

Germany Operation Smith Meter GmbHRegentstrasse 125474 Ellerbek, GermanyP:+49 4101 304.0

The specifications contained herein are subject to change without notice and any user of said specifications should verify from the manufacturer that the specifications are currently in ef-fect. Otherwise, the manufacturer assumes no responsibility for the use of specifications which may have been changed and are no longer in effect.

http://www.fmctechnologies.com/measurementsolutions