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Yokogawa Power Series Plus Digital Switchboard Meter

  •  Scaling of the instrument for PT (potential transformer) primary ratings up to 1250:1; and CT (current transformer) primary ratings up to 5000:1.
  • Adjustable transducer output proportionate to the primary input setting.
  • Electrical legends (i.e., Watts, Kilowatts, Megawatts) can be set by the user and indicated by a red LED adjacent to the selected legend.
  • Display average setting: Adjustable to obtain a “rolling average” of inputs. Increasing the number of samples reduces annoying “digit bounce” by the least significant digit.
  • All settings are stored in non-volatile memory. If there is a loss of power to the instrument, all settings will remain as they were prior to power loss.
  • Accuracy of ±0.2% of reading, ±0.1% of full scale.
  • True RMS current and voltage measuring capability. A most desirable feature when distorted wave forms are present on the line.
  • High resolution/ high intensity LED displays that can be viewed from almost any angle.
  • Single Function - 2491 SERIES
    AC Volts, Amps, Watts, VARs, Power Factor, Phase Angle, and Frequency
  • Dual Function - 2492 SERIES
    Volt-Amp, Volt-Freq, Watt-VAR, Watt-Power Factor
  • Triple Function - 2493 SERIES
    3 Volts, 3 Amps, Volt-Amp-Freq, Watt-VAR-Power Factor. Now Available with Modbus Option.
  • All watt, VAR, power factor and phase angle models are available single phase; single phase, three wire; three phase, three wire; and three phase, four wire
    (2½ and 3 element).

     

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Yokogawa 2493 Shown
 

Product Information
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The POWER SERIES Plus digital switchboard meter was developed by Yokogawa Corporation of America to provide our customers with a versatile AC digital power meter. The heart of our POWER SERIES Plus meter is a programmable ASIC Power Measurement Chip (PMC) which was jointly developed by the General Electric Company and Yokogawa Electric Corporation. This unique PMC capability will continue to expand into many new power measurement and control products offered by Yokogawa Corporation of America.

The design of the POWER SERIES Plus combines a high accuracy digital switchboard meter with transducer output which can be configured in the field by an end-user, or when installed in new electrical equipment by an OEM. It eliminates requirements for a large inventory of dedicated instruments, and provides flexibility when new panel designs or system upgrades require changes in instrument transformer ratings. Our rugged metal case fits standard panel cutouts for switchboard meters and makes it a perfect replacement for less versatile instruments. The RS-485 communications option allows up to 32meters to be networked together for remote monitoring and control. In addition, the POWER SERIES Plus can be set up and locked out for security via the remote communications option.

Up to Three Screen
Ideally designed for easy retrofit into existing switchboard meter panel cutouts.

The 2491 has only one, easy to screen LED screen, while the 2492 features two different LED screens, to aid the user in comparing two different frequencies.

The 2493 features three easy to read LED displays, minimum/maximum values at the touch of a button, scaling up to 1250:1 for potential transformers and5000:1 for current transformers. Optional 0-1mA DC and 4-20mA DC analog out-puts are configurable by the user and RS485 communications option is available at no additional cost. The 2493 is also available with a wide choice of power supply options.

Highly Customizable
The POWER SERIES Plus can be configured for primary and secondary transformer inputs, legends, outputs and averaging function. At Yokogawa, we program each model according to the specified options required by the user. This minimizes the number of steps to set up the instrument at the job site or on the factory floor.

Each model is programmed only for the options selected, so there are no unnecessary menu items. If you select a Voltmeter without analog output, then set up will be limited to PT ratios, LED display, and average setting. All can be accomplished in less than one minute. If no transformer is required, the ratio entered for PT P and PT S is 1 (1:1).

Sturdy Construction
The POWER SERIES Plus is enclosed in a rugged steel case treated with zinc chromate to resist corrosion. The cover assembly and faceplate are constructed of high temperature polycarbonate material and have several gaskets which seal out dust and moisture from the front cover. The 26 position terminal board is a glass-filled polycarbonate material with #8 nickel-plated brass terminals inserted.
 

Power Series Plus - General Specifications
Display Type 4 digit red LED (9999 counts) for 2493 readouts (3 displays)
4 1/2 digit red LED for 2491, 2492
Digit Height 0.56 inch or 14mm
Response Time 200ms min. update time for 2491, 2492
160ms min. update time for V/V/V, A/A/A, Watt/VAR/PF 2493
320ms min. update time for V/A/Hz 2493
Auxiliary Power 2491 Choice of 120V or 240V AC (±15%), 45-65 Hz, 4.5VA max.
2942 Select either 120V or 240V AC (±15%), 45-65Hz, 4.5VA max.
2943 1
Input Rating Current 0 to 1A AC; 0 to 5A AC
Voltage 0-120V AC, 0-240V AC (W/VAR/PF/PA)
0-150V AC, 0-300V AC (Volt/Freq)
Frequency 50/60 Hz and 400 Hz
Input Range Rated Current A/W/VAR: 0-200%; PF/PA : 20-200%
Rated Voltage V/W/VAR: 0-120%; PF/PA: 50-120%; Frequency: 20-120%
Input Frequency Range Volts, Amps, Hertz 45-65Hz up to the 9th harmonic measuring capability
±2% of Specified Accuracy
Sustained Input Rated Current A/W/VAR/PF/PA: 200% continuous; 10x rating for 5 seconds
Rated Voltage V/W/VAR/FREQ : 120% continuous; PF/PA : 150% continuous
Burden Current <0.2 VA per element
Voltage 120V: <0.2VA per element; 240V: <0.4VA per element
Accuracy Reference condition: 25°C, 45-74%RH, at rated input 60Hz sine wave, 30 min. warm-up Voltage ±0.2% of reading ±0.1% of full scale
Current
Watt/Var
Power Factor ±0.05 Power factor
Phase Angle ±0.5°Phase Angle
Frequency 2491,2942 ±0.01 Hz @ 40-70Hz, ±0.1Hz @ 300-500 Hz
2493 ±0.1Hz @ 40-70 Hz and ±0.5Hz @ 300-500Hz
Analog Output and Response Time 0 to 1mA, 0 to ±1mA 10VDC compliance into 10k ohm load maximum
4 to 20mA, 12 ±8mA 15VDC compliance into 750 ohm maximum
1 second maximum response time within ±1% of final value
Output Ripple 0.5% peak-to-peak maximum of output span
Communications Optional RS-485 half duplex interface with networking up to 32 units, Selectable Baud Rate
Isolation Voltage and Insulation Resistance Input to output/case 2500V AC for 1 minute / more than 10 Megohm @ 500V DC
Aux. power to case AC 2000V AC for 1 minute / more than 10 Megohm @ 500V DC
DC 500V DC minimum / 10 Megohm minimum @ 100V DC
Aux. power to output AC 2000V AC for 1 minute / more than 10 Megohm @ 500V DC
DC 500V DC minimum / 10 Megohm minimum @ 100V DC
Output to case 1000V AC for 1 minute / more than 10 Megohm @ 500V DC
Temperature Range Operating -20 to +60°C at 90% RH maximum (non-condensing)
Storage -40 + 85°C
Temperature Coefficient Display and Comm: ±150 PPM/°C maximum of full scale
Analog Output ±250 PPM/°C maximum of full scale
Influence of Magnetic Field 0.5% maximum at 400 ampere turns/meter
Input Voltage <0.05 Power Factor (10-120% of rated voltage)
Shock/Vibration per ANSI C39.1
Unbalanced Current <0.2% of full scale
Input Frequency <0.05 Power Factor (45-65Hz)
Load Resistance (Analog Input) 0 to 1mA, 0 to ±1mA : 0 - 10K ohm within ±0.05% of full scale
4 to 20mA, 12 ±8mA : 0-750 ohm within ±0.05% of full scale
Dimension W x D x H = 4.33 x 6.54 x 4.33 inches
Weights 2491 1000g (2.2 lbs)
2492  1100g (2.4 lbs)
2493 1250g (2.75 lbs)
 
Power Series Plus - Model Types
Specifications  
Single Function
(2491)
AC Amps/AC Volts/ Frequency HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
AC Watts and Vars HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
Power Factor and Phase Angle HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
Dual Function
(2492)
AC Volt + Amp HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
AC Volt + Frequency HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
AC Watt + Var HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
AC Watt + Power Factor HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
Triple Display
(2493)
AC Watt + AC Var + Power Factor HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
3 in 1 AC Volt or Amp HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
3 in 1 AC Volt / Amp/Hertz HOME > YOKOGAWA > POWER-SERIES > INDEX yokogawa logo
 
Ordering Information
Model Description Price
2941 Yokogawa 2940 Power Series Plus Digital Switchboards, Single Please Call
2942 Yokogawa 2940 Power Series Plus Digital Switchboards, Double Please Call
2943 Yokogawa 2940 Power Series Plus Digital Switchboards, Triple Please Call