Marsh Bellofram DigiTec Division Tachometers-Generators Brochure
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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 1

Rugged, accurate RPM signal generators with many applications in transportation, mining, oil and gas, marine and industrial markets Tachometer-Generators

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 2

DC Tachometer-Generators ø 0.3740 Cal. Screw 1.560" 3.000" 4.660" 0.850" 3.620" (118.36mm) (9.5mm) (21.59mm) (39.62mm) (76.2mm) (91.95mm) .281" (6.63mm) DIA. 4 HOLES 1/4" square Drive Dog 1.875" 1.875" .560" 0.05" 5.00" 2.44" 3.00" 2.44" The model 750 DC Tachometer-Generator embodies a permanent magnet f ield surrounding a rotat ing armature. The commutator segment s are made from a special non-corrosive alloy which has an except ionally long life. The brushes are of a sel f-lubricat ing material and are carried in a sel f-aligning holder which equalizes the pres- • Rigid die-cast aluminum...

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 3

12.30" 0.7490 .740" 5.25" 4.75" 4.77" 0.7490 .740" 5.25" 4.75" 4.77" 12.35" Splash-Proof model 750, Type W • Heavy-duty cast iron housing • Sealed for water wash down area’s • Base mounted tachometer • ½ NPT conduit junction box included • ¾” Diameter drive shaft supported by heavy duty ball bearings • 2.0 oz-in starting torque • Heavy-duty cast iron housing • UL Listed for Hazardous Locations Division 1, Class 1, Group D and Class 2, Groups F and G • Base mounted tachometer • ½ NPT conduit junction box included • ¾” Diameter drive shaft supported by heavy duty ball bearings • 2.0 oz-in...

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 4

AC Tachometer-Generators 1/4" square Drive Dog 1.875" 1.875" .560" 0.05" 5.00" 2.44" 3.00" 2.44" The 758 Series of tachometers are used in low maintenance applicat ion requirement s . The 758 model embodies a stator surrounding a rotat ing AlNICO permanent magnet . The output of the generator for voltage responsive systems is temperature compensated and is propor t ional to the speed. The ball bearings need not be lubricated • ½” diameter drive shaft • Base mounted configuration • 2.5 oz-in starting torque • Standard 7/8” S.A.E. screw type mounting • 3/16” Drive Dog Shaft • 2.0 oz-in...

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 5

Splash-Proof model 758, Type W • Heavy-duty cast-iron base-mounting type housing • ¾” diameter drive shaft supported by heavy duty ball bearings • Conduit junction box with ½ NPT opening • Designed for locations which are subject to mechanical abuse or water spray • 3.0 oz-in starting torque • Heavy-duty cast-iron base-mounting type housing • ¾” diameter drive shaft supported by heavy duty ball bearings • Conduit junction box with ½ NPT opening • UL Listed for Hazardous Locations Division 1, Class 1, Group D and Class 2, Groups F and G • 3.0 oz-in starting torque 800.727.5646 •...

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 6

The rotor of the generator uni t should be mounted to the t rue center of the shaf t wi th ext reme care, par t icularly in higher speed applicat ions . The relat ively small iner t ia of the rotor makes i t possible to secure i t to the shaf t wi th a right hand thread regardless of the direct ion of rotat ion. I t is recommended that a steel screw having an SAE thread be used to permi t maximum t ightening. NOTE: DO NOT press f i t the rotor to the shaf t , or the rotor will shat ter because of the bri t t le nature of the magnet ic rotor material. THIS SURFACE MUST BE FLAT & TRUE METHOD...

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 7

• Provides protection for terminals, and has a ½ NPT connection for conduit 1.20" 2.82" 1/2 NPT Binding Post Conduit Box model J2, J2R, M2 and K3 Metallic leaf brushes are of an alloy which will wear before the commutator bars . Brush replacement is a simple f ield operat ion. 1.08" 1.55" 1.36" 1/2 N PT Accessories Provides protection for the terminals, and has a ½ NPT connection for conduit. Model 750 Catalog No. Types J2, J2R, M2 and K3 9933-0143156 Binding Post Conduit Box model 750 Types J2, J2R, M2 and K3 Binding Post Conduit Box model 758 Types AB, JB2 and KB3 Model 758 Catalog No....

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Marsh Bellofram DigiTec Division Tachometers-Generators Brochure - 8

IMPORTANT NOTICE Our recommendat ions , if any, for the use of this product are based on test s believed to be reliable. The greatest care is exercised in the select ion of our raw materials and in our manufacturing operat ions . However, since the use of this product is beyond the cont rol of the manufacturer, no guarantee or warranty, express or implied is made as to such use or ef fect s incidental to such use, handling or possession or the result s to be obtained, wether in accordance wi th the direct ions or claimed so to be. The manufacturer expressly disclaims responsibili ty...

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