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Marsh Bellofram DigiTec Division 750E Series Explosionproof Tachometer/Generator

Marsh Bellofram DigiTec Division 750E Series Explosionproof Tachometer/Generator

Product catalog summary

Overview: The Model 750 DC Tachometer-Generator is designed with a permanent magnet field and a rotating armature. It features a non-corrosive alloy commutator and self-lubricating brushes in a self-aligning holder. The armature shaft is supported by ball bearings, requiring no lubrication for up to 15,000 hours or approximately 3 years. The unit is housed in a heavy-duty cast-iron casing and is suitable for hazardous locations.

Specifications:

Voltage Output: 6 Volts ±1% at 1000 RPM
Accuracy: ±1%
EMF Linearity: ±0.15%
Permissible Current Drain: 50 mA
Max RMS Value of AC Ripple: 2%
Allowable End Play: .005"
Max Operating Temperature: 250°F
Internal Resistance at 25°C: 20 Ω ±2%
Number of Brushes: 2 per set, made of Palladium Silver Alloy
Armature: 12 Bars, 12 Slots
Insulation: Class 105
Hi-Pot Test: 500 Volts for 1 minute
Temperature Compensation: 0.1% per 10°C change
Normal Continuous Speed: 2000 RPM
Min Top Speed: 100 RPM
Max Speed: 5000 RPM
Starting and Running Torque: 2.0 oz.-in.
Shaft Diameter: 3/4"
Shaft Length: 1-1/2"
Adjustable Magnetic Shunt Range: ±4%
Direction of Rotation Effect: ±0.6%
Mounting: Base
Enclosure: Explosion-Proof
Measurements: 12.35"L x 4.77"H x 6.13"W
Weight: 24.5 lbs.

Ordering Information: Model Number 750-9905001 refers to the 750-E Tachometer-Generator.

Catalog excerpts

Marsh Bellofram DigiTec Division 750E Series Explosionproof Tachometer/Generator-1

750-E Series Digitec Division atcdigitec.com 800.727.5646 330 Tachometers/Generators // 750-E Series The Model 750 DC Tachometer-Generator embodies a permanent magnet field surrounding a rotating armature. The commutator segments are made from a special non-corrosive alloy which has an exceptionally long life. The brushes are of a self-lubricating material and are carried in a self-aligning holder which equalizes the pressure of both brushes. The armature shaft rotates on ball bearings which under normal operation do not need lubrication for 15,000 hours running time or approximately 3 years, which-ever comes first. Maximum recommended speed is 5,000 rpm. Brush life is greatest at the lower speeds. Rigid, heavy-duty cast-iron housing and mounting base. 3/4" diameter shaft, supported by heavy-duty ball bearings. Includes conduit junction box with 1/2" N.P.T. opening suitable for flexible conduit, mountable in anyone of four positions. This unit is listed by Underwriter laboratories for use in hazardous locations Division 1 (vapors exist continuously), Class 1, Group D (natural gas or the vapors from lacquer solvents, acetone, alcohols, and petroleum derivatives), and Class 2, Groups F and G (carbon black, coal or coke dust, grain dust, etc.). Approximate torque. 2.0 oz.-in. starting, 2.0 oz.-in., running (1000 RPM). E x p l o s i o n - P r oo f T a c h omet er s /Generator s File #E102224 \\\DIMENSIONS (INCHES/MILLIMETERS) \\\SPECIFICATIONS VOLTAGE OUTPUT AT 1000 RPM 6 Volts ±1% Per 1000 RPM ACCURACY ±1% EMF LINEARITY 1 ±0.15% PERMISSIBLE CURRENT DRAIN 50 mA MAX RMS VALUE OF AC RIPPLE 2% ALLOWABLE END PLAY .005" MAX OPERATING TEMPERATURE 250°F INTERNAL RESISTANCE AT 25°C 20 ½ ±2% NUMBER OF BRUSHES 2 Per Set COMPOSITION OF BRUSHES Palladium Silver Alloy ARMATURE 12 Bars, 12 Slots INSULATION Insulation Class 105 HI-POT TEST 500 Volts for 1 Min. BEARINGS Ball TEMPERATURE COMPENSATION 0.1% Per 10°C Change NORMAL CONTINUOUS SPEED 2000 RPM MIN TOP SPEED 100 RPM MAX SPEED 2 5000 RPM STARTING TORQUE 2.0 oz. ins. RUNNING TORQUE 2.0 oz. ins. SHAFT DIAMETER 3/4" SHAFT CONNECTION Direct, Geared or Belted SHAFT LENGTH 1-1/2" ADJUSTABLE MAGNETIC SHUNT RANGE ±4% DIRECTION OF ROTATION EFFECT ±0.6% MOUNTING Base ENCLOSURE Explosion-Proof MEASUREMENTS 12.35"L x 4.77"H x 6.13"W WEIGHT 24.5 Ibs. \\\ORDERING INFORMATION MODEL NUMBER DESCRIPTION 750-9905001 750-E Tachometer-Generator

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