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Yokogawa 251/255 Horizon Line Panel Meters

Horizon Line Panel Meters
251/255

These meters possess the same precision qualities as New Big Look. In addition, Horizon Line panel meters can be front or rear mounted on panel.

• Extra-wide scales
• Big bold numerals above the scale
• Divisions for unobstructed reading
• Tapered needle-sharp pointers
• Shadow-free acrylic covers help pinpoint values
• Available in taut band and pivot and jewel types.
• Gasket sealer gives New Big Look dust and moisture resistant design. (Except 1-1/2”).

Select a link under the "item" tab below to order.

Table 1Table 2Table 3Table 4
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Table 1Size
11½”
22½”
33½”
44½”
Table 2Elec. and Mechanical Variables
00DC Amps Zero-Left
01DC Amps Zero-Center
04DC Volts/Ext. Res. Zero-Left
05DC Volts/Ext. Res. Zero-Center
10AC Amps Rectified
20DC Volts Zero-Left
21DC Volts Zero-Center
24DC Millivolts Zero-Left
25DC Millivolts Zero-Center
30AC Volts Rectified
37AC Expanded Scale Voltmeter
38DC Expanded Scale Voltmeter
40AC Amps (I/V)* 60 Hz
44AC Volts (I//V)* 60 Hz
45AC Volts 400 Hz (I/V)*
50Frequency
Table 3Elec. Rating
LS5 Amps
MT10 Amps
NG20 Amps
Table 4Scale
LS0-5 Amps
MT0-10 Amps
NG0-20 Amps
Accuracy AC/DC Iron-Vane ±2% of full-scale
AC Rectifier Types ±3% of Full scale (with 60Hz sine wave at 25°C)
When standard 60 Hz iron vane ammeters are used at the extreme limits of 20 or 400 Hz, additional error (approx. .75%) may be experienced.
Expanded Voltmeters ±0.5% of full-scale
Overload Voltmeters (AC/DC) 50% Momentary
20% Sustained
Ammeters (AC/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
Scale Data 90 degree rotation
Scale Length 1 1/2" 1.50"
2 1/2" 2.06"
3 1/2" 2.88"
4 1/2" 3.93"
Insulation Level 1 1/2" 1500 Vrms Hi-pot
All Meters (other then 1 1/2") 2600 Vrms Hi-pot
Burden Data AC Ammeter 5 amps, 0.5 va, Max. 0.5 power-factor lagging @ 60 Hz.
AC Voltmeter unity power factor
Response Time and Overshoot 3 seconds (max.) for 21⁄2", 31⁄2", 41⁄2" size for microammeters; 2 seconds (max.) for all other DC ratings, and 2.5 seconds (max) for AC ratings. Maximum of 40% overshoot.
Additional Notes
  1. Pivot & jewel instruments are not available in 1 1⁄2" size.
  2. Meter with flame retardant window and base only available in 2 1⁄2", 3 1⁄2" and 4 1⁄2" sizes. Include /CUL or /UL at the end of the catalog number or contact factory.
  3. For ratings and scales not listed contact the factory.


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