Model CL420, Clamp-on Process Meter,
Measure 4 to 20mA DC signals without breaking the loop!

Clamp-on meters capable of measuring up to 120mAdc
(for conductors up to 6 mm in diameter)
Yokogawa CL420 Clamp-on Meters
  • 0.2% Accuracy and 0.01 mA Resolution from 0-20 mA DC
  • mA Measurement and % of Span for 4-20 mA
  • Dual LCD Numeric Display.
  • LED Torch Light
  • Data Hold Function
  • 6mm Clamp Diameter
  • Analog Output Available
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  • Preventative maintenance
  • Testing for current leakage on branch circuits
  • Measuring current draw of motors and motor control circuits


This device allows the user to make safe current checks of 4 to 20mA without breaking the loop. In addition, the output function provides a simple way to log and monitor the data. The CL420 Clamp-on Process Meter will safely measure 0-120 mA DC process control signals without breaking the loop. Typical application examples include distributed control systems, programmable logic controllers, pressure and temperature transmitters, and loop powered isolators and indicators.
  • Literature
  • Specifications
Literature and Technical Information
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Clamp-on Meters – Portable Test Instruments

++ CL420 Clamp-on Meters| Specification sheet
Model: Yokogawa CL420 Clamp-on Meters
Display 4-digit LCD Numeric display
Specific Accuracies
DC Current
Range: 20.00 mA [0.00 to±21.49mA]
Resolution: 100.0 mA [±21.0 to ±126.0mA]
Accuracy: ±(0.2%rdg+5dgt)
Accuracy (20mA): ±(1.0%rdg+5dgt)
DC Voltage Output
20.00 mA [0.0 to±214.9mV] (DCA Accuracy)+(±0.5mV)
100.0 mA [±210 to±1260mV] (DCA Accuracy)+(±3mV)
General specifications
Response Time Approx. 1.5 seconds (2.5 seconds when across the range)
Range Switching Auto range
Data Hold On all range
Safety Standard EN61010-1, EN61010-2-030, EN61010-2-032
Withstanding Voltage 2.21kV AC for 5 seconds (between the core and the case)
Diameter of measurable
6 mm at maximum
Operating temperature: -10˚C to +50˚C 80% RH or less (no condensation)
Relative Humidity: 80% RH or less (no condensation)
Dimensions 61 (W) x 111 (H) x 40 (D) mm
Weight Approx. 290g (including batteries)
Accessories User’s Manual, Batteries, Soft case (93045)
Power Supply Four AA-size alkaline batteries (1.5V LR6)
Battery Life Approx. 60hrs (continuous) backlight off and LED light off