Gestra NRG19-41

Gestra

产品编号: NRG19-41
生产厂家: Gestra
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Datasheets for Gestra NRG19-41

Description for Gestra NRG19-41

System Description The level electrode operation is based on the conduc-tive measuring principle. The NRG 1...-41 is designed for signalling the max. liquid level in electrically conductive liquids. n One liquid level with one switchpoint The NRG 1...-41 is to be used in conjunction with the switching controller NRS 1-41 and further system components. The NRG 1...-41 in conjunction with its associated control equipment constitutes a water level limiter with periodic self-testing routine (SMART function) in accordance with TRD 604, sheet 1 and 2 and EN regulations. The level data are transferred from the electrode NRG 1...-41 to the control unit via a CAN bus using the CANopen protocol. Function The conductivity of the liquid is used to signal the liquid level. Some liquids are conductive, which means that they allow an electric current to flow through them. For the safe functioning of this device a minimum conductivity of the liquid to be measured is required. The conductivity measurement method can detect two conditions: electrode rod submerged or exposed, meaning switchpoint reached (or exceeded) or not yet reached. Before installation, the length of the electrode rod must be cut to the required switching level, e. g. for “Pump off” or “Control valve closed” or, in case of economiser and air heaters that are installed close to the steam-generating unit and exposed to a risk, “Firing/Burner off”. An additional electrode fully integrated in the system automatically monitors the electrical resistance path between earth and measuring electrode. As soon as the actual value falls below the admissible resistance value the protection circuit is interrupted and cuts off the pump or heat supply to the boiler.

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