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Marsh Bellofram DigiTec Division 758-W Series Explosionproof Tachometer

Marsh Bellofram DigiTec Division 758-W Series Explosionproof Tachometer

Product catalog summary

Overview: The 758 Series tachometers are designed with a multi-pole cylindrical magnet and a wound stator made from quality transformer iron lamination. They produce a single-phase sine wave output current suitable for voltage-responsive systems. For higher accuracy, a 32-ohm stator version is available for frequency-responsive systems. For speeds exceeding 5,000 rpm, bearingless AC generators are recommended.

Specifications:

Voltage Output: 10 Volts AC ±1% per 1000 RPM (Open Circuit)
Accuracy: ±1%
EMF Linearity: Dependent on load and speed
Permissible Current Drain: 150 mA
Frequency at 900 RPM: 60 Hz Sine Wave
Allowable End Play: 0.005"
Max Operating Temperature: 250°F
Internal Resistance at 25°C: Standard Unit 100 Ω ±1%, F. Type Unit 32 Ω ±20%
Insulation: Class 105
Rotor: Alnico V, 8 Poles
Stator: 8 Poles
Bearings: Ball
Temperature Coefficient: Standard Unit 0.2% per 10°C change, F. Type Unit not compensated, 0.4% per 10°C change
Min Speed: 500 RPM
Max Top Speed: 5000 RPM
Starting Torque: 2.0-3.0 oz. ins.
Running Torque at 1000 RPM: 2.3 oz. ins.
Shaft Diameter: 3/4"
Shaft Connection: Direct, Geared, or Belt
Shaft Length: 1-1/2"
Electrical Connection: 1/2" NPT 10-32 Studs
Mounting: Base
Enclosure: Spray Resistant
Measurements: 12.35" L x 4.77" H x 6.13" W
Weight: 24.5 lbs. Approximate

Design Features: The tachometers feature a heavy-duty cast-iron base-mounting type housing with a 3/4" diameter shaft supported by heavy-duty ball bearings. They are designed for environments subject to mechanical abuse or water spray, such as paper mills and chemical plants. The housing is gasket sealed for protection.

Ordering Information:

Model 758-9910002: 758 Type W Tachometer for Voltage-Responsive Systems
Model 0133484-902: 758 Type WF Tachometer for Frequency-Responsive Systems

Catalog excerpts

Marsh Bellofram DigiTec Division 758-W Series Explosionproof Tachometer-1

758-W Series Digitec Division atcdigitec.com 800.727.5646 338 Tachometers/Generators // 758-W Series The 758 Series of tachometers all use a multi-pole cylindrical magnet turning in a wound stator constructed from quality transformer iron lamination. Single phase output current is a sine wave over the speed range of the tachometer. These units have 100 ohm stators and are intended for voltage responsive systems. When greater accuracy is required, use a tachometer having a 32 ohm stator (designation F in the type number) and a frequency responsive indicating system. For speeds over 5,000 rpm, use the bearingless AC generators. Rigid, heavy-duty cast-iron base-mounting type housing with fl" diameter shaft supported by heavy duty ball bearings for direct coupling, pulley, spur gear or chain and sprocket drive. Provided with conduit junction box with 1/2 N.P.T. opening suitable for flexible conduit which may be located in anyone of four positions at right angle to shaft. Designed for locations which are subject to mechanical abuse or water spray, such as paper mills and chemical plants where cleaning up by hose is frequent. Housing is gasket sealed. Approximate torque: 3.0 oz. in. starting, 3.0 oz.-in. running (1000 rpm). E x p l o s i o n P r o o f T a c h omet er \\\SPECIFICATIONS VOLTAGE OUTPUT AT 1000 RPM 10 Volts AC ±1% Per 1000 RPM Open Circuit ACCURACY ±1% EMF LINEARITY Dependent Upon Load and Speed PERMISSIBLE CURRENT DRAIN 150 mA FREQUENCY AT 900 RPM 60 Hz Sine Wave ALLOWABLE END PLAY 0.005" MAX OPERATING TEMPERATURE 250°F INTERNAL RESISTANCE AT 25°C Standard Unit 100 ½ ±1% F. Type Unit* 32 ½ ±20% INSULATION Insulation Class 105 ROTOR Alnico V, 8 Poles STATOR 8 Poles BEARINGS Ball TEMPERATURE COEFFICIENT Standard Unit 0.2% Per 10°C Change F. Type Unit* Not Compensated, 0.4% Per 10°C Change MIN. SPEED 500 RPM MAX. TOP SPEED 5000 RPM STARTING TORQUE 2.0-3.0 oz. ins. RUNNING TORQUE AT 1000 RPM 2.3 oz. ins. SHAFT DIAMETER 3/4" SHAFT CONNECTION Direct, Geared or Belt SHAFT LENGTH 1-1/2" ELECTRICAL CONNECTION 1/2" NPT 10-32 Studs MOUNTING Base ENCLOSURE Spray Resistant MEASUREMENTS 12.35" L x 4.77" H x 6.13" W WEIGHT 24.5 Ibs. Approximate *F-Type generators for use in frequency responsive systems only. any of the above types can be supplied for use in frequency systems \\\DIMENSIONS (INCHES/MILLIMETERS) \\\ORDERING INFORMATION MODEL NUMBER DESCRIPTION 758-9910002 758 Type W Tachometer for Voltage-Responsive Systems 0133484-902 758 Type WF Tachometer for Frequency-Responsive Systems BINDING POST COVER BOX

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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