General Details

Water Level Control Module
Type “WLC”

The “WLC” module is designed for conductive liquids (water) level control in pump systems. An example diagram of a typical water level pump control system in well installation is shown on Fig. 1.

Shema - Water Level Control Module - Ver.31 – Submersible motor
2 – Pump
3 – Common probe (electrode)
4 – Low level probe (electrode)
5 – High level probe (electrode)
6 – Submersible pipe column
7 – Base plate
8 – Solar power drive system with “WLC” module
9 – Pump motor power supply cable
10 – High level
11 – Low level

H – Positive suction head

The working principle of the “WLC” module is based on the resistance between the “HIGH” to “COMMON” and “LOW” to “COMMON” electrodes. The distance between the “HIGH” and “LOW” probes, forms the level hysteresis. The distance between the “LOW” and “COMMON” electrodes, forms the dry run protection level.

Recommended sensors (electrodes) are “Lovato” 11SN13 – Kit of 3 level electrodes, or similar types.


Techical Info
Control System Side (CON1)
Digital Output 0 (DO0)Active “High” (24Vdc). Reaction from sensor set 1.
Digital Output 1 (DO1)Active “High” (24Vdc). Reaction from sensor set 2.
Communication Serial Port (RX, TX)For “SPCS” units internal use only
Power Supply (+24V_IN, D_GND)+24Vdc / 100mA
Sensor Side (CON2)
HIGH1 level (HI1)Sensor Set 1 – high level sensor (electrode)
LOW1 level (LO1)Sensor Set 1 – low level sensor (electrode)
HIGH2 level (HI2)Sensor Set 2 – high level sensor (electrode)
LOW2 level (LO2)Sensor Set 2 – low level sensor (electrode)
COMMON (COM)Common (ground) electrodes
General Data
Reaction time≤1 s
Level electrodes voltage frequency50 Hz
SensitivityResistance between level electrodes ≤ 30 kΩ
Isolation Voltage1kVdc (min) for 1 sec. (optional 2kVdc (min) for 1 sec.)
Degree of ProtectionIP 20
Operation Temperature-10ºC / + 50ºC
IndicationRed LED
Operation Mode1 Sensor Set / 2 Sensor Sets
CommunicationSystem Internal Serial Port *
* – used for internal communication in “SPCS” units only

Table 2 – “WLC” module LED Indication and Digital Output States

DO0 StateDO1 StateWater Level Indication LED StateComment
102 sec. lit “ON” → 2 sec. extinct;Winking uniformly with period 4 seconds.
010,2 sec. lit “ON” → 3,8 sec. extinct;1 short wink, long dark pause.
110,2 sec. lit “ON” → 0,2 sec. extinct → 0,2 sec. lit “ON” → → 3,4 sec. extinct;2 short winks, long dark pause.
000,2 sec. lit “ON” → 0,2 sec. extinct → 0,2 sec. lit “ON” → → 0,2 sec. extinct → 0,2 sec. lit “ON” → 3,0 sec. extinct;3 short winks, long dark pause.


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