Converter LB-470 is used for changing the standard of a digital
so called S300), used in the meters
of LAB-EL production, to a standard of the analogue signals 4..20mA,
often in the industrial automatic systems. The converter is produced in
various versions, depending on a type of a LAB-EL meter with which it
is supposed to cooperate. As an example, it can be: a hytherograph
LB-710, an anemometer
a sun radiation meter
LB-900 or other
according to the orders.
It is possible to realize additional special functions through the converter LB-470 (i.e. calculating programmed for an individual order). As an example to a converter version cooperating with a hytherograph LB-710, it is possible to calculate in a converter a dew point temperature which result controls one of the converter’s outputs 4..20mA.
The converters LB-470 can be connected in series where from one meter it is possible to receive any number of various (in a general case) the output signals 4..20mA. All of the outputs 4..20mA are isolated galvanically and work with an outside power supply (current sources).
The converter LB-470 cooperates with a device equipped with an
S300. The measurement data received
by the converter are changed to a current interface in the scope
4..20mA with 16 bit resolution. A current value is proportional to
currently received value sent from an attached measurement device. The
converter stores in its non-volatile memory data concerning the scope
of .. so called values fro which the output current gets a value 4 i 20
mA adequately. The scope of processing is programmed by the producer
based on a specification of a person ordering a device. The scope of
processing can be in the future changed upon a user’s request.
is made in two versions with one or two transmitter channels 4..20mA.
The converter is equipped with an output in standard S300 used for
retransmission of the received data. Because of such output the
converter can be switched on in series in a system based on the
interface S300. The converter is equipped with a lighting diode
informing a user about a status in which the converter actually is. The
converter is powered from a network 230V/50..60Hz.
The converter LB-470 is also a source of power supply for a
cooperating with it device (a meter) with an interface S300. The
current analogue converter outputs (4..20mA) as well as digital S300
are isolated galvanically between itself and the converter. The
converter is locked in a casing adjusted for assembly on a bus rail
The producer in accordance with a specification of an ordering person stores to an internal non-volatile converter memory the values specifying the scope of such operation can be performed many times. For each analogue channel two values are introduced (MIN and MAX). If the actual value of a given value received by the interface S300 is smaller than the introduced MIN then the energy consumption forced in an analogue channel amounts to 4mA. For a value which exceeds MAX the current value is set for 20mA. If an input value stays between MIN and MAX then the current adopts a value: 4 + 16*(X-MIN)/(MAX-MIN) [mA] (where X it is a received number value from a meter).
In case of lack of reception of the input data (a device with an interface S300 is not attached) and in case of shortage in .. power supply a current of value 3,5 mA is forced, signaling incorrect system work.
|Output S300||Accepted voltage||7...30V|
|Energy consumption (for 12V of output power supply)||1mA (stand by status), 25mA (active status)|
|Outputs 4..20mA||Accepted voltage||7...30V DC|
|Processing error (maximum)||+/- 0,02 mA|
|RECOMMENDED CONSTANT WORK CONDITIONS *)|
|Scope of temperatures
|Scope of humidity||20..80%|
|Level of environment corrosion aggressiveness accord. PN-71/H-04651||B|
|Scope of voltage||230V / 50Hz (possibility of ordering in a version with power supply voltage 12 V DC/AC)|
|Energy consumption||2 V|