• YOKOGAWA

250 Series {Biglook Style}

1 ½" to 4 ½" Panel meters. Easy to Read Scales, Ideal for Complicated Scaling
(Our most popular meter, known for it’s reliability )

Features

  • Pivot and Jewel or Taut Band models available
  • Accuracy: ±2% DC; ±2% AC- iron vane
  • Accuracy: ± 3% AC – rectifier type (60 Hz sine wave)
  • Tracking: ± 1 1/2% DC; ± 2% AC ; vertical mounting
  • Repeatability: ± 0.5% DC and
  • Rectifier type; ± 2% iron vane
  • 400Hz, Iron vane, Pilot and Jewel Type
  • UL and IP54 splash proof models (2 1/2 & 3 1/2″ only) available
  • Expanded Scales available
  • Surface or conduit mounting
  • Surface or window mounting option

Applications

  • Standard panel applications
  • Instrumentation – manufacturing component
  • Ideal for adverse (dusty) environments or severe applications, meets UL-1437, IEC 144 or IP54
  • Ideal for OEM and Retrofit applications

Description

These meters feature extra wide scales, big bold numerals above the scale divisions for an unobstructed reading. A tapered needle, sharp pointer and shadow free acrylic cover help to easily view values. Meters are available in taut band or pivot and jewel mechanisms. They meet ANSI C39.1. In addition to these features, these meters also meet UL/CSA and/or IEC specifications. Scaling and inputs can be easily modified to meet custom applications. The Big Look panel meters are gasketed to seal out dust and other air-suspended damaging particles and are ideal for adverse environments.

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Our modification department can modify the input and scaling information to your exact specifications, from dual scaled meters, to non-standard distributions such as cosø and log scaling. For high resolution readings, our modification department can produce a higher accuracy meter , calibrated to better than ±1% and if required an expanded scale with an accuracy of ±0.5% of full-scale.
For process applications, meters can be mechanically suppressed to 4-20 mADC, up to 20% of end scale and an accuracy of ±2% or better if required.

 
  • Literature
  • Specifications
Model: Yokogawa 250 Series- 1 1/2", 2 1/2", 3 1/2" and 4 1/2" sizes
Display
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 units.
Specific Accuracies
Basic Accuracy: ±2.0% of full scale basic accuracy class. **±1% or better upon request
Rectifier Type Meters: ±3% of full scale basic accuracy class. **±1.5% or better upon request
Expanded Scale Voltmeters: 0.5% of full scale
Frequency Meters: ± .15Hz @45-55Hz and 55-65Hz, ±0.093Hz @ 58-62Hz, ±1.5Hz @350-450Hz
Zero Suppressed Meters: Errors at 20% suppression = ±3% of end-scale ***±2% or better upon request
Higher Accuracy: **1% of Full scale or better
General specifications
Position of use: Vertical (scale) standard or to specified angle or position
Full scale deflection angle: 90 °
Full scale length: 11⁄2” 1.40”
21⁄2” 2.06”
31⁄2” 2.88”
41⁄2” 3.93”
Movement: Taut Band
The absence of friction permits greater sensitivities, this rugged Yokogawa band is ideal for applications that require quick response, repeatability or experience vibration.
because there are no moving parts, common failures of conventional pivot and jewel meters such as cracked jewels and/or blunt pivots are no longer a problem.
Pivot and Jewel
In this design the coil and pointer are supported by polished steel pivots at each end which fit into jewel bearings. Pivot and jewel meters are recommended for high vibration environments. The mechanism’s inherent stability and strength provide accuracy, repeatability and performance are almost equal to the taut-band mechanism. However, hardened jewels and pivot points eventually wear out, causing repeatability and friction problems towards the end of the meter’s life.
Case: ABS plastic, Black with grey back
Cover: Gasketed cover to prevent contaminant ingress, ABS cover and window.
Insulation Level: All meters (except 11⁄2”), 2600 Vrms Hi-pot, 11⁄2”-1500 Vrms Hi-pot.
Overload rating: Voltmeters (AC and DC) – 50% momentary, 20% sustained. Ammeters (AC and DC) momentary; 10 times the rated current for 10 consecutive intervals of .5 second with a 1 minute interval between successive applications; sustained:
20% for six hours.
Burden Data: AC Ammeter 5 amps @ 60 Hz, 0.5VA, Max. .5 Power factor lagging, AC voltmeter – unity power factor.
Severe-duty meters: Conform to CSA or UL 1437 requirements in 2-1/2” – 4-1/2” sizes.
Response time: 3 seconds (Max.) – Microammeters
2 seconds (Max.) – All other DC ratings
2.5 seconds (Max.) – All AC ratings
Maximum 40% overshoot
Environmental
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)
Dimensions
1 1/2" Meters Download PDF File
2 1/2" Meters Download PDF File
3 1/2" Meters Download PDF File
4 1/2" Meters Download PDF File