Chapter 1—Introduction
3
Type Description
CM-2050 Instrumentation, 1% accuracy
CM-2150 Instrumentation, 0.2% accuracy, data logging, alarm/relay functions
CM-2250 Waveform capture, plus CM-2150 features
CM-2350 Instrumentation, waveform capture, 0.2% accuracy
CM-2450 Programmable for custom applications, plus-2350 features
Table 1-2
Class 3020 Circuit Monitors
Table 1-1
Summary of Circuit Monitor Instrumentation
Table 1-3
Circuit Monitor Feature Comparison
EXPANDED MEMORY New Series G4 (or higher) circuit monitor models CM-2150 and higher now
are factory-equipped with 100 kilobytes (100K) of nonvolatile memory.
(Earlier Series G3 models CM-2150 and CM-2250 shipped with 11K of
memory, models CM-2350 and CM-2450 with 100K of memory.)
Real-Time Readings
• Current (per phase, N, G, 3Ø)
• Voltage (L-L, L-N)
• Real Power (per phase, 3Ø)
• Reactive Power (per phase, 3Ø)
• Apparent Power (per phase, 3Ø)
• Power Factor (per phase, 3Ø)
• Frequency
• Temperature (internal ambient)*
• THD (current and voltage)
• K-Factor (per phase)
Demand Readings
• Demand Current (per-phase present, peak)
• Demand Voltage (per-phase present, peak)*
• Average Power Factor (3Ø total)*
• Demand Real Power (3Ø total)
• Demand Reactive Power (3Ø total)*
• Demand Apparent Power (3Ø total)
• Coincident Readings*
• Predicted Demands*
Energy Readings
• Accumulated Energy, Real
• Accumulated Energy, Reactive
• Accumulated Energy, Apparent*
• Bidirectional Readings*
Power Analysis Values*
• Crest Factor (per phase)
• K-Factor Demand (per phase)
• Displacement Power Factor (per phase, 3Ø)
• Fundamental Voltages (per phase)
• Fundamental Currents (per phase)
• Fundamental Real Power (per phase)
• Fundamental Reactive Power (per phase)
• Harmonic Power
• Unbalance (current and voltage)
• Phase Rotation
•
Harmonic Magnitudes & Angles (per phase)
* Available via communications only.
Feature CM-2050 CM-2150 CM-2250 CM-2350 CM-2450
Full Instrumentation ✘✘✘✘✘
RS-485 Comm Port ✘✘✘✘✘
Front Panel Optical Comm Port ✘✘✘✘✘
1% Accuracy Class ✘
0.2% Accuracy Class ✘✘✘✘
Alarm/Relay Functions ✘✘✘✘
On-board Data Logging ✘✘✘✘
Downloadable Firmware ✘✘✘✘
Date/Time for Each Min/Max ✘✘✘✘
Waveform Capture ✘✘✘
Extended Event Capture ✘✘✘
Extended Memory (up to 1.1 Meg.)* ✘✘✘✘
Sag/Swell Detection ✘✘
Programmable for Custom Applications ✘
* Standard memory: CM-2150, CM-2250, CM-2350, and CM-2450 = 100K; CM-2452 = 356K
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