How can we help?
< All Topics

Wellmon 750 user manual

Wellmon 750 User manual


The Polar Monitoring Wellmon 750 is a remote monitoring telemetry device for water wells & boreholes.

It was designed to give owners more information about their borehole. It monitors the ground water level inside of the well as well as if the pump is running.

The 750 controllers comes with the ability to monitoring the pumps run state remotely via the web portal. As well as integration with VSD’s for remote diagnostics and control.

Remote Monitoring

The heart of the Wellmon range is the ability to be able to remotely monitor your site using the Polar Monitoring online portal.

Polar Monitoring provides the following facilities on its web-based portal:

  • Visualizations of collected data
  • Logging & history of data points
  • SMS & Email Alerts
  • Reports & CSV Downloads

The Polar Monitoring portal is located at: https://portal.polarmonitoring.com


You will need a valid user account in order to make use of the online portal.

Ask your subscription administrator to create an account for you. Or if you are the subscription admin you can add additional users via the “Users” Tab.

You are able to add unlimited number of users to access the device.

Wellmon 750 installation

Physical Installation

Mount the unit at a convenient place close to the pump’s controller box & the well. The unit is IP66 water & dust resistant, so it can be mounted outdoors.

Keep in mind that the unit uses GSM connectivity, so it should not be mounted close to any large transformers or electrical machinery as this could affect the GSM signal.

Make sure that the unit is mounted vertically, with the cable glands positioned at the bottom.

Electrical Installation

  • Remove the four screws on the front of the unit and remove the front cover
  • The wiring connections are all done on the din rail mounted terminals on the inside of the enclosure.


The electrical connections are shown below:

Group Name




 Power In







Positive (+) 12V DC

Level Sensor

4-20mA 2 wire (12V DC)






Positive (+)

Pulse Counter

Water Meter Reed Switch





Run Sense

Through Relay 1 of VSD






Positive (not used)


Rs485 Modbus for VSD
(Set VSD Address to 2)


A (+)


B (-)




There are 4 steps to correctly wiring the unit:

  1. Connecting AC power to the unit
  2. Connecting the pump / contactor
  3. Connecting the pump run sense
  4. Connecting the sensor probe


1.     Connecting AC power to the unit

This step involves connecting power to the Wellmon unit. This will be used to power the telemetry as well as the pump control circuitry.

NB: Please note that Wellmon 750 controller operates on 12V DC power.

Connect terminal 1, 2, and 3 up to the corresponding mains power source.


2.     Connecting the Pump

In order to be able to remotely monitor the pump from the web portal, one needs to connect the VSD Relay 1. The Wellmon 750 controller has a dedicate input for monitoring the pump.

Relay 1 needs to be wired into the monitoring terminals of the 750 unit. This will be done by running a 2 core wire from terminal 11 to the common of the VSD and then N/O from the relay to Terminal 10 of the Wellmon 750 Unit

The VSD will have to be programmed such that when the pump is on that it triggers relay 1 to the closed position.


Connecting the Level Sensor probe

Installing the Level sensor into the tank

The Level probe needs to be place inside the tank, such that the pressure probe lies flat on the floor of the tank, this probe will be fully submerged by the water in the tank, and the cable must be secured. A junction box must then be used to do a cable connection to run the sensor to the Wellmon 750 device. Caution must be taken to not damage the vent tube of the sensor as this will cause incorrect readings to occur.

Connecting the sensor to the controller

Bring the sensor cable through cable gland at the bottom of the Wellmon controller.

The sensor cable has 2 wires and the Vent tube, Red wire is to be wired into Terminal 7 And the yellow wire into
Terminal 6.

If the sensor has an earth shielding this can be connected to Terminal 5

Connecting the water meter pulse counter.

Connect a wire to the reed switch output on the water meter.  Connect to Yellow (common) and one of the green or red wires. (You only need two)

Bring this into the controller box. Connect it up to terminal 8 & 9.


Connecting the RS485 Modbus

The cable from the Modbus should run from the RS485 outputs of the VSD to Terminal 13 & 14 on the Wellmon 750 controller. It is important in this application that the cables are a 2 core shielded and twisted pair as without this noise can affect the system.

Please ensure that a ground wire is attached to the setup from the VSD DC ground to Terminal 15 on the Wellmon. The shielding sleeve must also be connected to this ground wire on the Wellmon Control box side




Power Input Voltage

12V DC

Power usage

20W Max


300mm (Width)

400mm (Height)

180mm (Depth)

Weight – PVC Enclosure

3 Kg

Weight – Steel Enclosure

6 Kg

Table of Contents
Copyright © 2023 Polar Monitoring