CT SENSORS

Ecofront energy monitor uses CT sensors to monitor current. The sensors connect to the analog inputs on the energy monitor, of which there are two types:

  • Source (SRC) channels SRC1&2 on the standard unit SRC1,2&3 on the pro unit
  • Sub Circuit channels CH1~8 on the standard unit and CH1~16 on the pro unit.

The SRC channels and the sub circuit channels serve different functions - they measure current in different ways and therefore use different sensor types.

SRC Channel High Current CT Sensor Range

Split core CT sensors used on SRC1~3
Part Number: EFCTSA010075A EFCTSA024250A
Descriptions: 75A Split Core CT 250A Split Core CT
Windings: 3000 3000
Rated input current (Arms): 75 250
Max input current(Arms): 100 275
Rated voltage: 250VAC
Insulation resistance: 100MΩ@500Vdc
Dielectric strength: 2500V (r.m.s)
Nominal linearity error : -1 ± 1%
Case material: Nylon Resin UL94-V0
Case colour: White
Operating temperature: -16~60°C
Dimensions (mm): ID10 L29.4 W26.4 H41.7 ID24 L51.2 W47.0 H70.2
CT Sensors

Sub Channel CT Sensor Range

Closed loop CT sensors used on sub circuits CH1~16
Part Number: EFCT10A/10mA EFCT20A/10mA EFCT40A/10mA EFCT100A/10mA
Descriptions: 10A CT Sensor 20A CT Sensor 40A CT Sensor 100A CT Sensor
Windings: 2000
Rated input current (Arms): 10 20 40 100
Max input current(Arms): 12 24 48 120
Rated voltage: 250VAC
Insulation resistance: 100MΩ@500Vdc
Dielectric strength: 2500V (r.m.s)
Linearity: less than ± 1% at 5%~120% of rated current:
Case material: Plastic resin
Case colour: Black
Operating temperature: -40~85°C
Dimensions (mm): ID7.8 L23.5 W11 H25 ID7.8 L23.5 W11 H25 ID9 L26 W17 H28.5 ID13 L37.5 W14 H38.8
CT Sensors

Split core CT sensors used on sub channels CH1~16
Part number: EFCTSA20A/10mA
Descriptions: 20A Split Core CT
Windings: 2000
Rated input current (Arms): 20
Max input current(Arms): 30
Rated voltage: 250VAC
Insulation resistance: 100MΩ@500Vdc
Dielectric strength: 2500V (r.m.s)
Nominal linearity error : -1 ± 1%
Case material: Nylon Resin UL94-V0
Case colour: White
Operating temperature: -16~60°C
Dimensions (mm): ID10.2 L28.75 W26.4 H41.7
CT Sensors

VOLTAGE SENSOR

The Ecofront energy monitor has up to 3 voltage measuring inputs. These are matched to CT sensor mains measuring channels SRC1~3 and are used to help accurately calculate power consumption and power factor. The energy monitor cannot read high voltages directly and must use the EFPVT-240 voltage sensor.

The EFPVT-240 is a potential transformer that provides a linear output voltage proportional to the input voltage. The output voltage is 2 volt when the input voltage is 250VAC and will work with most standard mains AC circuits up to 380VAC.

EFPVT-240 Voltage Sensor
Part number: EFPVT-240
Input voltage: 100 ~ 380VAC @ 50/60Hz
Output voltage Max 4V @ 50/60Hz
Rated current ratio: 2mA/2mA
Accuracy: 1%
Input leads: 14AWG, double insulated blue and brown pair, 1 meter long
Output leads: 26AWG, double insulated black and red pair, 2 meters long
Operating Temperature: -40~85°C
Case Material: Black ABS, UL94V-0
Dimensions (mm): Body: L79.25 W52.07 H40.13
Input cable: 1000
Output cable: 2000
Voltage Sensor