Yokogawa 2493 Power Series Plus Digital Switchboard Meter 3 in 1 AC Watt/Var/Power Factor Triple Function

  •  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.

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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
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
Watt/Var/PF Triple Function Measuring Capabilities Available Connection 1P2W
3P4W (2 1/2 Element)
3P4W (3 element)
Maximum Input Rating 120 Volt/1 Amp
240 Volt/1 Amp
120 Volt/5 Amp
240 Volt/5 Amp
Electrical Legend Watts/Vars
Power Factor
Lag Lead
Display Type 4 digit red LED (9999 counts)
Response Time 160ms min. update time for V/V/V, A/A/A, Watt/VAR/PF
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
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
Frequency ±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
Temperature Coefficient Display and Comm: ±150 PPM/°C maximum of full scale
Analog Output ±250 PPM/°C maximum of full scale
Influence of Input Voltage <0.05 Power Factor (10-120% of rated voltage)
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
How to Order

2493 Triple Function Digital Switchboard

-# -# -# -# -# -#
Watt / Var / Power Factor 1P2W 34          
Watt / Var / Power Factor 1P3W 35
Watt / Var / Power Factor 3p3w 36
Watt / Var / Power Factor 3p4W (2 1/2 Element) 37
Watt / Var / Power Factor 3p4w (3 element) 38
Volt/Amp Rating 120 V/ 1A AC 1
120V/ 5A AC 2
240V/ 1A AC 3
240V/ 5A AC 4
Frequency 50/60 Hz 5
400 Hz 6
Analog Output No Output AAA
0 to 1 mA AFA
0 to ±1 mA AFB
4 to 20 mA AHD
Communication None 0
RS-485 1
Aux. Power Supply 120V AC 1
240V AC 2
24V DC 3
48V DC 4
125V DC 5
Notes 1)  120V or 240V AC Auxiliary power is Standard. Contact factory for availability of DC Power Options
2) NIST Calibration Certificate: Specify and add $50.00 each per unit.
3) NIST Calibration Certificate with Test Data: Specify and add $100.00 each per unit.
4) Certificate of Conformance: No charge, but specify with order.
Example Product
  Base Model Functions/
Volt/Amp Input Rating Frequency Analog Output Communication Aux. Power Supply
Triple Function Digital Switchboard
Watt / Var/ Power Factor 1P2W
240V/ 5A AC
400 Hz
4 to 20 mA
125V DC
2493 34 4 6 AHD 2 5
Ordering Information
Model Description Price
2493 Yokogawa 2493 Power Series Plus Digital Switchboard Meter;
3 in 1 AC Watt/Var/Power Factor Triple Function
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