Related Manuals for Magnetrol B75
Summary of Contents for Magnetrol B75
- Page 1 B73 & Series 75 Installation and Operating Manual Sealed External Cage Liquid Level Switches...
- Page 2 Magnetrol will repair or replace the control at no cost to a component’s mechanical integrity. Cautions are also the purchaser (or owner) other than transportation.
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Page 3: Table Of Contents
B73 & Series 75 Liquid Level Switches Table of Contents 1.0 Installation 5.0 Specifications 1.1 Unpacking ......1 5.1 Agency Approvals . -
Page 4: Installation
Piping Figure 3 shows a typical piping installation of a Magnetrol B73 and Series 75 control to a pressure vessel. Level decals on control identify the actuation levels for a unit with a single switch at minimum specific gravity. -
Page 5: Mounting
Category II, Pollution Degree 2. Adjust piping as required to bring control to a vertical position. Magnetrol controls must be mounted within 3° of vertical in all directions. A three degree slant is noticeable by eye, but installation should be checked with a spirit level on top and/or sides of float chamber. - Page 6 3. Tighten set screw(s) at base of switch housing. 4. Unscrew and remove switch housing cover. The threads have been lubricated to facilitate removal. NOTE: For supply connections, use wire with a minimum rating of +167° F (+75° C) as required by process conditions. Use a minimum of 14 AWG wire for power and ground field wires.
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Page 7: Reference Information
Reference Information Description Magnetrol’s B73 and Series 75 level switches are float oper- ated units suitable for use on clean liquid applications for level alarm, pump control and safety shutdown functions. Series 75 units are available with tandem floats for applica- tions where widely spaced high and low switching are required by a single control. -
Page 8: Switch Differential Adjustment
Switch Differential Adjustment The standard differential of Series 75 float models with one switch may be field adjusted. Adjustment may be necessary if a wider differential needs to be set to overcome switch chatter caused by the process. NOTE: This procedure may be applied to single switch models only. The differential, or the amount of level travel between switch-on and switch-off, may be adjusted by repositioning the lower jam nuts on the float stem. - Page 9 5b. Close shut-off valves (if so equipped) to isolate control from tank. Drain off liquid in float chamber. 5c. On installations without shut-off valves, relieve pressure from the tank. Drain liquid in tank to a level below the connections of the float chamber. NOTE: Level control, connections and pipe lines need not be removed from the tank.
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Page 10: High Level Controls
2.4.2 High Level Controls On high level controls, the switch trips on the higher actu- ation point and resets on the lower actuation point. Caution: On high level controls, widening the differential requires raising the trip point a proportional amount. The reset point will remain the same. -
Page 11: Differential Adjustment
2.5.2 Differential Adjustment Caution: No differential adjustment should be made on tandem float models in the field. Switch actuation levels have been set at the factory to meet customer specifications. Variations in actual conditions, from design conditions, usually require special control modifications. Troubleshooting Usually the first indication of improper operation is failure of the controlled equipment to function, i.e., pump will... -
Page 12: Check Sensing Unit
8. If switch mechanism is operating satisfactorily, proceed to check sensing unit. NOTE: As a matter of good practice, spare switches should be kept on hand at all times. Check Sensing Unit 1. Reconnect power supply. Being careful to avoid electrical shock, manually actuate switch mechanism (use a non- conductive tool on electrical switch mechanisms) to deter- mine whether controlled equipment will operate. -
Page 13: Preventive Maintenance
Model and Serial numbers. Preventive Maintenance Periodic inspections are a necessary means to keep your Magnetrol level control in good working order. This con- trol is a safety device to protect the valuable equipment it serves. A systematic program of preventive maintenance must be implemented when the control is placed into service. -
Page 14: Inspect Switch Mechanisms, Terminals, And Connections Monthly
4.1.2 Inspect Switch Mechanisms, Terminals, and Connections Monthly 1. Mercury switches may be visually inspected for short circuit damage. Check for small cracks in the glass tube containing the mercury. Such cracks can allow entrance of air into the tube causing the mercury to “oxidize”. This is noticeable as the mercury will appear dirty or dull, and will not break into clean, round pools. -
Page 15: Specifications
1. Never leave switch housing cover off the control longer than necessary to make routine inspections. 2. Never place a jumper wire across terminals to “cut-out” the control. If a “jumper” is necessary for test purposes, be certain it is removed before placing control into service. 3. -
Page 16: Physical
Maximum Process Temperature Temperature Classification < 85° C < 100° C < 135° C < 200° C < 300° C < 450° C These units are in comformity with IECEx KEM 05.0020X Classification Ex d IIC T6 T ambient -40° C to +70° C Physical STAINLESS STEEL CHAMBERS WITH 1 INCH CONNECTIONS INCHES... - Page 17 Inches (mm) Series 75 Series 75 Series 75 Flanged Upper Side/Bottom Flanged Side/Side Threaded and Socket Weld Upper Side/Bottom ➃ 6.25 (158) ➃ 6.25 (158) plugged ➃ 6.25 ➄ (158) plugged ➄ ➄ plugged Model B73 Model B73 Model B73 Upper Side/Bottom Flanges Side/Side Flanges Threaded and Socket Weld...
- Page 18 6.36 3.34 17.44 9.25 6.25 20.32 9.90 6.25 21.00 1.22 2.10 151 84 442 235 159 515 251 159 532 B75 0.67 2.56 3.24 8.69 3.80 22.69 11.56 6.69 25.56 12.21 6.69 26.21 97 576 294 170 649 310 170 666 C75 0.55...
- Page 19 Inches (mm) Series 75 Series 75 Series 75 Flanged Upper Side/Bottom Flanged Side/Side Threaded and Socket Weld Upper Side/Bottom ➃ 6.25 (158) ➃ 6.25 (158) plugged ➃ 6.25 ➂ plugged (158) ➂ ➂ plugged Model B73 Model B73 Model B3 Threaded and Socket Weld Upper Side/Bottom Flanges Side/Side Flanges...
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Page 20: Replacement Parts 6.1 Series 75
Replacement Parts 6.1 Series 75 6.1.1 Parts Identification Item Description Housing cover Housing base Switch mechanism Jam nuts Lock washer Attraction sleeve Stop tube (not shown) Enclosing tube E-tube gasket Chamber assembly IMPORTANT: When ordering, please specify: A. Model and serial numbers or control. B. -
Page 21: Series 75 With Material Code 1
6.1.3 Series 75 with Material Code 1 All Models except S75, V75 & Z75 S75, V75 & Z75 Only Housing cover See Section 6.1.2, Switch and Housing Reference Housing base on previous page for switch and housing bulletin furnished. Switch mechanism Attraction sleeve kit: includes items 4, 5, 6 &... -
Page 22: Model B73
Model B73 6.2.1 Parts Identification Item Description Housing cover Housing base Switch mechanism Jam nuts Lock washer Attraction sleeve Enclosing tube E-tube gasket Chamber assembly IMPORTANT: When ordering, please specify: A. Model and serial numbers or control. B. Name and/or number of replacement assembly. Many Model 75 controls are specially tailored to meet customer specifications and, therefore, may contain special parts. -
Page 23: Series 75 Tandem Float Units
Series 75 Tandem Float Units 6.3.1 Parts Identification Item Description Housing cover Housing base Switch mechanism Jam nuts Upper attraction sleeve Lower attraction sleeve Spacer washer (not shown) Retaining ring E-tube gasket Enclosing tube Chamber assembly 6.3.2 Series 75 Tandem Float Units Models B, C, G, J, L, &... -
Page 24: Model Numbers
Model Numbers Model B73 MODEL NUMBER CODE Pressure Rating psig @ ° F bar @ ° C Model Min. Œ Œ Materials of Construction B73-1 0.59 Carbon steel chamber, 316 stainless steel float, 400 stainless steel trim B73-2 0.59 Carbon steel chamber, 316 stainless steel float, 316 stainless steel trim B73-3 0.59 304 stainless steel chamber, 316 stainless steel float, 304 stainless steel trim... -
Page 25: B73 & Series
ELECTRIC SWITCH MECHANISM AND ENCLOSURE Model B73-1 Only Models B73-2, B73-3, B74-4 NEMA 4X/7/9 Aluminum Enclosure Ž Process Class I, Div 1 Class I, Div 1 Class I, Div 1 Class I, Div 1 Temperature One Set Point Groups Groups Groups... -
Page 26: Model Series 75
Series 75 MODEL NUMBER CODE Œ Pressure Rating Min. S.G. for models with Model Material of Construction Code psig @ ° F bar @ ° C Code Ž Ž Ž Ž 3 & 4 1000 CARBON STEEL CHAMBER 0.67 0.71 1000... - Page 27 ’ ELECTRIC SWITCH MECHANISM AND ENCLOSURE Construction Code 1 Construction Codes 2, 3 & 4 “ (except Model S75) and Model S75 Process ” NEMA 4X/7/9 Aluminum Enclosure Temperature Class I, Div 1 Class I, Div 1 Class I, Div 1 Class I, Div 1 Range Groups...
- Page 28 No claims for misapplication, labor, direct or consequen- tial damage will be allowed. 5300 Belmont Road • Downers Grove, Illinois 60515-4499 • 630-969-4000 • Fax 630-969-9489 • www.magnetrol.com 145 Jardin Drive, Units 1 & 2 • Concord, Ontario Canada L4K 1X7 • 905-738-9600 • Fax 905-738-1306 Heikensstraat 6 •...