VCM-EE in Explosion-Proof Enclosure


MPS’ most popular model in a protected explosion-proof enclosure. Applicable for Explosion-Proof Environments.

For the most complete protection on large, or critical machines, the VCM-E is ideal due to its higher shaft current measurement capacity, uninterrupted grounding, continuous monitoring via 4-20mA signals and alarms for alerting operators to dangerous conditions such as grounding device failure or increase in shaft voltage. VCM-E’s continuously monitor shaft voltage and/or grounding/earthing current providing three 4‑20 mA output signals (per VCM-E) for remote monitoring and trending.

Key Benefits

  • Explosion Proof
  • Prevent Shaft Current Damage
  • Shaft Current Sparking Confined or Controlled
  • Train Performance Tracking, Aiding Operation
  • Continuous Train Performance Sensing and Tracking
  • Continuous Train Trending Aiding in Maintenance Scheduling
    • Alarms when shaft grounding devices have lost contact with the shaft.
    • Alarms on high and low grounding current and/or high shaft voltage.


  Operating Range: -10°C to 50°C (14°F to 122°F)
  Relative Humidity:     0% to 95%, non-condensing
  Storage Range: -23°C to 60°C (-10°F to 140°F)
POWER REQUIREMENTS: 100-240 Vac, 50/60Hz input into the MPS supplied power supply.
     Current:100mV  (use shunt with 100mV/ full scale rating)
  (Max. input voltage equals +/-10V)
     Voltage:   +/- 1V    (Max. input voltage equals +/-5V)
  +/- 10V  (Max. input voltage equals +/-50V)
  +/- 100V(Max. input voltage equals +/-300V)
     Frequency                     Response:   30 Hz to 10 KHz
           Local: 3½ digit LCD display, indicating Average Current, Peak Current,                                                                                         Peak Voltage, and Power/Alarm Check, selectable with                                                                                                                                          rotary switch.
          Remote: 4 to 20 mA (Load impedance not to exceed 500 ohm) signal                                                                                                     representative of Peak Current.*
  4 to 20 mA (Load impedance not to exceed 500 ohm) signal                                                                                                     representative of Average Current.*
  4 to 20 mA (Load impedance not to exceed 500 ohm) signal                                                                                                     representative of Peak Shaft Voltage.*
  Optional latching available.  
          Local: LED’s for high and low current and high voltage.*
          Remote: Unified, single relay opening (10 watts, 0.5 A, and 100 Vdc)                                                                                           (100Ω minimum load) for high & low current and high voltage.*
NOTE:   Maximum shaft current is equal to shunt rating.                                                                                                                                                     Maximum shaft voltage is 1, 10, or 100 V (selectable).
Length: 7.6 inches (193 mm)   
Width: 7.8 inches (198 mm)  
Height: 7.6 inches (193 mm)  
 Weight: 15.0 pounds (6.8 kg)  
*  For shaft current monitoring and alarm, a 100 mV current shunt                                                                                                                                                for 1, 2, 5, 10, 20, 50, or 100 A is required.  
   For shaft voltage monitoring and alarm, a shaft voltage sensing device is required.
RATINGS: Class I Groups C & D and Class II Groups E,F,G.  
Order Code: VCM-EE    


  • "We were experiencing persistent and numerous intermittent generator field ground alarms for 3 months. Had we not installed the MPS VCM-E, the failure would have forced an outage. Thank you MPS!"

    - Generator Maintenance Supervisor, U.S.