The trend ‘Smart Metering’ did not go unnoticed at Lingg & Jahnke, Radolfzell. This KNX manufacturer has recently added a home electricity meter with KNX interface to its product offer. The calibrated three phase meter EZ382A-FW respectively EZ382-FW-REG and the alternating current meter EZ162A-FW are intended for larger installations as the intermediate meter or – with the approval of the relevant utility – as the main meter. Via an internal data logger, consumption data can be recorded during an entire year and can be transferred via network or KNX. The Basis for this is the ‘FTP over KNX’ standard and the Facility Web technology as designed by the company.
By using the network coupler NF-FW as interface, one can directly access the memory of the bus coupling unit in the KNX device via the web. Especially advantageous is the fact that no special software is needed during this certified and standardized communication with a KNX device. Thus the building operator can check the operating status and meter values of a device from any location via a network connection. The focus of the communication lies on accessing the data stored in the Facility Web bus coupling unit. In this way, all available consumption data of the meters is displayed, and the most important data over the period of one year is stored in the device itself. For an exact evaluation of consumption data, the operating hours of, for instance, dimmers, switching actuators and the temperature evolution of temperature sensors can play an important role. Long time recording of meter values and temperature evaluation, operating hours, data display in browsers, energy supply billing, remote diagnostics, …are only a couple of examples of the multiple applications with KNX for the intelligent recording and evaluation of energy values.
With the help of the meter interface ZS/S 1.1 of ABB Stotz Kontakt, consumption and measuring value of electrical energy consumption meters can be recorded and transmitted across KNX. The device is equipped with an infrared interface allowing reading out ABB energy Delta plus, Delta single oder Odin consumption meters. The read out information and data can be used for cost center billing, energy optimization, visualization or surveillance of an installation. The device is also able to transmit current voltage, current values, power or Cos phi values.
Bus Compatible Meter
Siemens has two types of electricity meters equipped with KNX bus coupling units in its product portfolio. They can be used in single or three phase networks and are delivered as directly connectable devices (type N162) or for connection to transformer (type N165), suitable for admission by the German national metrology institute (PTB). The LCD displays amongst others active energy, price per kWh, total costs, reactive energy and active volt-amperes. Data can be read out by KNX via the IR data interface. Devices which count operating hours and switching times are also available, which can be used to observe and record consumption data as part of an energy management concept.
Heat Metering (WMF)
The Arcus-EDS Heat Meter is a „Dialog WZ-CD“ Heat Con-sumption Counter (calibration optional) from the company NZR, with an integrated KNX Bus Interface for remote reading and monitoring. The electronic counter is operated by a lithium battery with a five year lifespan and one year additional reserve. The KNX bus interface is built into the counter and is connected non-reactively with the external terminal block. The meter with the integrated bus interface is authorized by the Physikalisch Technischen Bundesanstalt (PTB) (Federal Institute of Physical Engineering).
Metering consumption Impulse counter IMPZ
For an all-purpose consump-tion data logging for the KNX- Bus, arcus-eds has developed an impulse counter module with back-up data storage unit and KNX Bus Interface for remote reading and monitoring. The module in a IP65-Box is operated by a lithium battery with a five year lifespan and one year additional reserve. Meters including a pulse output (S0 Interface, relay contact) irrespective of the medium are possible to connect to the KNX Bus. The metering principle also allows an easy retrofit in existing installations. Appropriate meters for this application are the PTB-authorized meters for water, electricity and gas from the company NZR.
Tank probe KNX SO250
The tank probe KNX SO250 from Elsner Elektronik can be used to measure distances and check volumes in containers. It consists of an output device and an ultra sonic probe, with a range of 12 to 250 cm. The KNX S0250 has a connection to KNX and two additional outputs that can be switched when exceeding or dropping below a specified volume or distance. For this, the tank geometry, the number of tanks and the measuring interval can be set at the output device.
The display shows the current distance respectively volume. Via the integrated bus coupling, information on the current distance and volume can be applied in a flexible way.