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Alarm Group
Pools can be divided in Alarm Groups so that staff knows in which pool or area there is an incident. In the Sentag system all alarm inputs such as Sensors and push buttons, and outputs such as SIrens, Wall Units and aux putputs, can be configured freely.

An establishment is divided in to one or several zones. Receivers are configured to belong to a zone and alarms are configured and activated per zone.

Alarm parameters
Parameters for depth and time to be exceeded for the Sentag to trigger an alarm.

The Sentag (wristband) continuously monitor the depth and when the preset threshold (@80cm) is passed a timer starts. If the time exceed a preset value (@30 sec) the Sentag treat the situation as possible drowning and activates the alarm and send a signal in the pool be be detected by the Sensor Unit.

There can be areas in a pool where the Sentag signal is hard to detect by the Sentag Sensors, we call them blindspots. By planning the layout of Sensors, and adding more Sensors, the blindpsots can be kept to a minimum.

If someone has difficulty breathing as a result of being underwater, then they have drowned.

Definition according to WHO

Drowning is the process of experiencing respiratory impairment from submersion/immersion in liquid; outcomes are classified as death, morbidity and no morbidity.

Drowning is the 3rd leading cause of unintentional injury death worldwide, accounting for 7% of all injury-related deaths.
There are an estimated 372 000 annual drowning deaths worldwide.
Global estimates may significantly underestimate the actual public health problem related to drowning.
Children, males and individuals with increased access to water are most at risk of drowning.
Source: WHO

A microphone made to pick up sound in water.

The alarm signal from the wristband can be interfered by air bubbles, sound in the water and electrical installations. By increasing the numbers of sensors the problem can be minimised.

In communications and electronics, especially in telecommunications, interference is anything which modifies, or disrupts a signal as it travels along a channel between a source and a receiver. The term typically refers to the addition of unwanted signals to a useful signal. In our case the signal from the Sentag Wristband can be interfered from noise in the water but also from electrical interference from modern LED lamps, pumps and other electrical installations.

Lamp niche
A pot mounted in the pool walls to house pool lights.

Sentag uses standard pool lightning niches to fit the sensors into the poolwalls. The sensor is protected by a grid that allows for the wristband signal to reach the sensor but still protect it from abuse and ingress. The sensor cable is then pulled through the poolwall and connected to the receiver electronic outside of the pool, in a dry area.

Staff trained to supervise the safety and rescue swimmers in a swimming pool or water park. Lifeguards are strong swimmers and trained in CPR/AED first aid, certified in water rescue using a variety of aids and equipment depending on requirements of their particular venue.

Manual Alarm button
Pushbutton to manually activate an alarm, for instance placed by a water slide or in the sauna.

Manual pushbuttons allows visitors or staff to manually call for attention within a facility and have the alarm transferred and dispalyed in the Sentag system and in all, to Sentag connected, external alarmsystems like walkie-talkies, sirens, displays etc.

Sound created by water, engines, people and more that effects the underwater accoustic levels.

A small “coin like” tag that can store information and identify users.

Sentag wristbands can be equipped with various types of RFID chip which allow the operators to integrate towards an existing or a coming RFID access control system. When integrated this allows for functions such as; access control, automatic ticket handling, automatic issuing of wristbands, cashless payment, exit control with automatic retention of wristband and more.

The Sensor is a hydrophone, a sensitive microphone, that receives signals from the pool. It is connected to the Sensor Unit by a cable.

Sensor Unit
Electronics outside of the pool, connected to the Sensor (hydrophone) in the pool.

The Sensor Unit electronics monitors signal information from the pool via the Sensor, i.e. a hydrophone. After analysis it will determine if there is an alarm from a Sentag Wristband. In that case the information is sent to the Control Init for further handling.

Wall Unit
A wall mounted display and keypad to operate the Sentag system by Lifeguards.

Wearable technology
Body-worn electronic device with technology developed for a specific or general purpose or application.

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