Monitoring and remote operation of devices installed in sewer networks are an inseparable element of modern water and sewage systems that enable economic and easy operation management. It stems mainly from the need to:
- limit operation costs through minimising the need for local facility monitoring and more detailed maintenance scheduling;
- increase the ecological safety by reducing the reaction time of maintenance teams in case of a failure.
Data obtained through monitoring systems not only supports daily system operation but can also be used to plan future development and operation. Monitoring and remote control installations delivered with devices produced by Ecol-Unicon can cooperate with other devices within the same sewage network. The monitoring and remote control systems are flexible and are selected according to Client's expectations.
EU-AL ALARM SYSTEMS
EU-AL alarm systems are based on indicators, which by means of sensors enable constant monitoring of selected parameters of water and sewage devices. They are used in single-standing as well as network devices. Particular components and accessories the alarm system is composed of should be selected individually:
- choosing an indicator – type of power supply and GSM module option
- sensors configuration – according to the monitored parameter.
The indicator processing the signal coming from the sensors placed inside water and sewage devices and enabling control and visualisation of its parameters through:
- diodes on the main panel
- PC software – connection: a computer unit–indicator via a USB cable
- a text message (indicator with a GSM module)
THE MAIN ADVANTAGES OF THIS SYSTEMS ARE:
- monitoring of almost infinite number of devices
- giving custom names to the devices
- event log register for all devices
- remote turning off of the acoustic alarm in the device.
Reading and transmitting the data is carried out by means of sensors installed inside water and sewage devices. All sensors used by Ecol-Unicon are resistant to aggressive effects of wastewater. They can be installed in explosion hazard zones with intrinsically safe circuits.
- Overflow sensor informs about exceeding the level of wastewater table determined by the operator, which may result in wastewater flowing out of the device. It is most commonly used in separators, settling tanks and non-tidal chambers.
- Petroleum derivative/grease level sensor informs about exceeding the level of oil/grease inside separators determined by the operator
- Sediment level sensor informs about exceeding the level of sediments inside a chamber determined by the operator
- Limit switch informs about opening of a manhole or closing a sluice (a text message).
Optionally, a separate installation equipped with its own indicator and a gas detection sensor can be used to inform about the high level of hazardous gases (methane, hydrogen sulfide and other) inside the device.
Available types of sensors
EU-AL alarm systems can be fitted with two types of electronic sensors:
EU-L (level) - used to monitor one of two levels: sediment or overflow. Note: Two EU-L sensors can be fitted in one system - one for recording a high level of sludge, the other for overflow level control.
EU-O (oil) – used to detect the appearance of an oil or grease layer in the monitored device.
EU-L and EU-O sensors have EC type-approval certificate OBAC 17 ATEX 0004X.
Group, equipment category, class of equipment, explosion protection type, explosivity group, temperature class, equipment protection level:
The signalling unit enables simultaneous connection of three electronic sensors. Alarm levels of oil (EU-O), sludge (EU-L) and overflow (EU-L) can be monitored at the same time.
In addition, two contact sensors can be connected to the unit.
The most commonly used contact sensors include:
- Float, allowing to monitor additional levels of rainwater or sewage in the device, e.g. at emergency level.
- Limit switch installed in a cabinet (where signalling unit is installed) or hatch, informing the operator about opening the cabinet or lifting the hatch.
The use of additional sensors further increases operational safety of the alarm system and the monitored devices.
Power supply options
There are two ways to power EU-AL alarms. The basic version is an AC signalling unit powered with 230V voltage The device can be fitted with a GSM modem. As an alternative, the EU-ALB-GSM is a battery-operated signalling unit with a GSM modem as standard. This device is perfect for places situated away from the mains power supply. In addition, the EU-AL and EU-AL-GSM (powered with 230VAC) can be connected to a solar power supply and an emergency power supply (UPS). If a solar power kit is used, it is not required connect 230VAC power supply to ensure continuous operation.
Features of the GSM module and device configuration
With the GSM modem it is possible to send information about the alarm statuses occurring in the monitored device to the operator and additionally enables to perform the configuration of the signalling unit. The user of the system can also setup the device using PC software, which, together with other elements of the system, is supplied on CD, in three language versions (Polish, English and Russian).
At the configuration stage, the following data needs to be entered:
- location and type of the monitored device,
- installation date,
- the date of the planned inspection,
- telephone numbers to which SMS messages with user-defined information will be sent in emergency situations,
- Assignment of sensors to the corresponding potential-free outputs (when using external signalling).
Using the GSM modem offers the best chance to keep the object in an operational condition.
Optional additional equipment for the alarm system
Optional accessories (to be specified at the design stage) for alarm installations are as follows:
- additional wires allowing to install the signalling unit at a distance of up to 250 m from the monitored device (maximum distance depends on the type of cable used),
- connection couplings (intrinsically safe) for connecting sensor wires when the signalling unit is away from the monitored device,
- hermetic casing with a set of cable glands, which enables mounting the signalling unit on the external wall of the building,
- EU-UPS back-up battery supply, which allows the device to work for hours, even during mains power failure. This feature can be added to an already
existing EU-AL alarm device.
Installation of alarm systems
The necessary sensor mounting elements (cable clamps, wire thimbles, pins, etc.) are included according to the number of sensors ordered. Basic tools such as a drill and a set of keys are required for the installation of the alarm system.
Sensor mounting levels depend on the type of the monitored device and are specified in the installation manual included with the technical documentation. In case the signalling unit is located away from the monitored device, it is necessary to use a dedicated connection socket and intrinsically safe cables for the sensors used. The signalling unit can be installed both inside and outside of the building. In case of installation outside of the building it is necessary to order an optional casing.