Efento 4–20 mA loggers are designed to measure the output of 4–20 mA sensor probes and transmit data over NB-IoT networks to Efento Cloud or any other server. Each logger can support up to three analog channels, compatible with 2-wire probes, 3-wire PNP/NPN probes, and 4-wire probes.
The loggers can supply power (up to 16 V) to connected passive probes (2-wire, 3-wire PNP/NPN, and 4-wire). Alternatively, 2-wire, 3-wire PNP, and 4-wire probes may be powered by an external source (active mode). 3-wire NPN probes cannot be powered externally.
Efento 4–20 mA loggers measure currents within the −24 to 24 mA range, with a resolution of 0.001 mA. The shunt resistance (Rs) is 3 Ω.
Channel Configuration
Each channel can be configured for the required probe type using jumpers on the PCB:
Channel 1: Jumpers J1, J2
Channel 2: Jumpers J5, J6
Channel 3: Jumpers J3, J4
Jumper Settings
Warning! Always power off the device before changing jumper settings or wiring sensor probes.
Probe Type
Channel 1 (J1/J2)
Channel 2 (J5/J6)
Channel 3 (J3/J4)
2-wire, passive
open / closed
open / closed
open / closed
2-wire, active
open / open
open / open
open / open
3-wire PNP, passive
open / closed
open / closed
open / closed
3-wire PNP, active
open / closed
open / closed
open / closed
3-wire NPN, passive
closed / open
closed / open
closed / open
4-wire, passive
open / open
open / open
open / open
Warning: Never set the jumpers to the closed/closed position (J1 & J2 closed, J3 & J4 closed, or J5 & J6 closed). This configuration may damage the device.
Wiring
Efento 4–20 mA loggers include a 12-input terminal block. Each terminal is labeled on the PCB (V1–V3, I1–I3, O1–O3, G1–G3), indicating both the channel number and input type. Wiring varies depending on the probe type:
2-wire probe powered by Efento logger (passive)
2-wire probe with external power supply (active)
3-wire PNP probe powered by Efento logger (passive)
3-wire PNP probe with external power supply (active)
3-wire NPN probe powered by Efento logger (passive)
