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

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

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

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