Water management


1. Overview

Nethix wireless remote control products based on the use of GSM and SMS technology offer various opportunities of application in the management of aqueducts and water resources.

WE120 is an easy and economical device that is very effective in the resolution of small automation and remote control problems with modest investments.

This documents shows a use case of WE120 devices for control of aqueduct systems.

WE120 detects the water level present in a tank and sends SMS messages to another WE120 to control the remote actuation of the lifting pumps.

The system is easily extended to more tanks, even later and without laying cables thanks to wireless communication.

It is also able to operate autonomosly and to notify by SMS the teams of technicians available at the occurrence of anomalies.

../_images/we120_water_management_schema.png

2. Connections

2.1. Connection scheme of the WE120 #1

../_images/we120_water_schema_1.png
1 Level probe
2 Power supply

2.2. Connection scheme of the WE120 #2

../_images/we120_water_schema_2.png
1 Level probe
2 Power supply
3 PUMP

3. Configuration via Genesys 3

Nethix recommends using Genesys 3 to configure the two WE120.

3.1. WE120 #1

  • Start the Genesys and connect to the WE120 #1 device as explained in the chapter: Initialization of communication.
  • Configure the Service center present in the basic section.
  • Add an user with the WE120 #2’s number (refer to the section: Users)
    • Name: WE120_2
    • Phone: the number of the SIM card that is inserted in the WE120 #2
    • Alarms: Only SMS alarms
    • Privileges: Only read
  • Repeat the operation for any other users.
  • Configure the Analog Input 1 (refer to any section: Analog Input)
    • Name: LEVEL
    • Min: 0
    • Max: 8
    • Unit: M
    • Decimals: 1
  • Configure the A alarm of the Analog Input 1:
    • Threshold: 7
    • Condition: High
    • Delay: 0
    • Messagge: ON PUMP1
  • Configure the B alarm of the Analog Input 2:
    • Threshold: 1
    • Condition: Low
    • Delay: 0
    • Messagge: OFF PUMP1

In this way an SMS containing the text N PUMP1 is sent to the WE120 #2 device when the level probe value exceeding the 7 meters.

When the WE120 #2 receives that message, it activates the output called PUMP1 (this has been programmed as described in the next paragraph).

The shutdown of PUMP1 has also been programmed at the moment when the level drops below 1 meter.

3.2. WE120 #2

  • Start the Genesys and connect to the WE120 #2 device as explained in the chapter: Initialization of communication.
  • Configure the Service center present in the basic section.
  • Add an user with the WE120 #1’s number (refer to the section: Users)
    • Name: WE120_1
    • Phone: the number of the SIM card that is insert in the WE120 #1
    • Allarms: Only SMS alarms
    • Privileges: Admin
  • Repeat the operation for any other users.
  • Configure the Digital Output 2 (refer to any section: Digital Output)
    • Nome: PUMP1
    • Mode: Open
    • Open label: OFF
    • Close label: ON
    • Delay: 0

4. System operation

At this point the two devices are ready for use.

The device WE120 #1 continuously checks the value of the water level in the tank through the level sensor connected to an Analog Input. If the programmed thresholds are exceeded, WE120 #1 sends a command SMS to the device WE120 #2:

  • When the maximum level threshold is exceeded, the message ON PUMP1 is sent to the WE120 #2 that will activate the remote pump and will start the emptying operation
  • When the tank level has dropped below the minimum threshold level, the message OFF PUMP1 is sent to the WE120 #2 that will turns off the remote pump

The status of the system can be consulted remotely, at any time, with the use of the:ref:APP <we120_manual_setup_configuration_modes> or by sending a SMS message of STAT from a mobile phone. For this is necessary to register in both devices an authorized user to carry out this operation (for example the technician available and/or the plant manager), as described in the previous paragraphs.

The WE120 will reply to the STAT message with the status of the related inputs and outputs. In this specific case, the user will receive in real time the level measurement after sending the STAT message to the WE120 #1. Similarly, the user can know the current status of the pump (ON/OFF) by sending the STAT message to the WE120 #2 .

By sending the SMS ON PUMP1 or OFF PUMP1 message, the user can also manually control the start or stop of the PUMP at any time regardless of the tank level.


5. System scalability

Although the simplicity of the WE120, the described remote control and remote alarm system can be further expanded thanks to WE120 flexibility and the provision of inputs and outputs.

WE120 devices can be programmed, for example, to:

  • Measure other analog measurements – room temperature, pump temperature, flows, pressure, etc… – using appropriate sensors connected to the analogue inputs available
  • Receive alarm messages via SMS in certain conditions – exceeding critical temperatures, alarm detection on analog or digital inputs, snap thermal protectors, pump block, filter clogging, lack of network, intrusion, etc… –
  • Command manual remote operation of auxiliary devices or activation of any lock/unlock/reset mechanisms.