Jewell Instruments/Modutec

4951, 4981, 497 and 4991 Series, 4 1/2″ MIL-Spec. SwitchBoard Meters

Jewell 4991 Series, Analog Switchboard Panel Meters
Characteristics :
  • 250 degree scale deflection
  • Meters accurate to within ±2% of full scale
  • Meets MIL specs
  • Tracking: ± 1 1/2% DC; ± 2% AC ; vertical mounting
  • Repeatability: ± 0.5% DC and rectifier type
  • For High Shock and Vibration applications
  • UL, CSA and IP54 splash proof models avaliable
  • In Accordance to ANSI C39.1
Product Description:
These models are hi-shock, sealed watertight switchboard instruments. With a sturdy taut-band suspension, that allow these ruggedized meters to be used for commercial or military applications. Meet MILSpec
Specifications :
4951 Power Factor MIL-M-16034
4981 Watt Meters MIL-W-19088
497 Synchroscope MIL-I-16104A
4991 Expanded scale MIL-M-16125C MIL-M-23167
Scaling: Customized to any scaling desired, from linear to specialized Cos Ø, square root distributions, with color applications for visual emphasis and to any desired engineering unit.
Specific accuracies
Basic Accuracy: ±2% of full scale basic accuracy class.
Rectifier Meters: ±2% @ 25°C calibrated to sine wave.
Power Factor: 0.025% @ 0.5 PF , 0.007% @ 1.0 PF
Expanded Scale: 3% of frequency span
Position of use: Vertical (scale) standard or to specified angle or position
Full scale deflection angle: 250°, except synchroscope is 360°
Full scale length: 6.9 inches.
Movement: Proven, shock resistant Taut Band
Case: All switchboard instruments have drawn steel case
Cover: polycarbonate cover and window.
Terminal plate: phenol resin material.
Mounting studs: 1/4” x 28 thread.
Terminal studs: 10-32 thread.
Dielectric level: 2500VAC for 1 minute between the electrical circuit and mounting studs.
Overload rating: Voltmeter and potential coils-1.2 x rating (continuous). AC Ammeters- 2 x rating (continuous), and 10 x rating for one second. Current coils (other than ammeters) 1.5 x rating (continuous), and 10 x rating for one second.
Response time: Approximately 3 seconds
Operating Temp.: 0 to 40°C (32 to 104°F)
Storage Temp: -10 to 50°C (14 to 50°F)
Extreme temperature range: -20°C to 65°C (-4 to 149°F) Tropicalized or IP54 sealed units available
Relative Humidity: 95% (non condensing)
pdf_pic Downloads: General Specifcations
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