Radiometric Test Station РКС-03 ИК

The radiometric control station is designed to measure the activity of mined uranium ore in a trolley or dump truck body, with the aim of determining the mass fraction of uranium in the ore portion and issuing control signals for sorting, as well as accumulating measurement information in the database and displaying the results on the screen registrar. РКС-03ИК (hereinafter РКС) provides simultaneous and independent operation of two measurement channels. The block diagram of the station is shown in Fig. 1.

Fig. 1. Structural scheme РКС-ИК

 

Composition РКС-03ИК:

  • dual channel recorder РИ-1 ИК.154.00.000;
  • smart type detection units БДЛГ-04ИК ИК.150.00.000 (up to 8 pcs. per channel);
  • discrete input modules БДВ2-485 ИК.152.00.000 (1 pc. for each channel);
  • software that allows you to save and display information about the work РКС to the screen of a personal computer.

 

Terms of Use РКС-03ИК:

For detection units and discrete input modules:

  • ambient temperature - from minus 30 ° С to plus 50 ° С;
  • relative humidity no more than 90% at a temperature of 35 ° C;
  • atmospheric pressure from 86 kPa to 107 kPa.

For registrar РИ-01:

  • ambient temperature - from plus 5 ° С to plus 40 ° С;
  • relative humidity no more than 90% at a temperature of 35 ° C;
  • atmospheric pressure from 86 kPa to 107 kPa.
The operating mode of the RKS is continuous.
 
MTBF - 5000 hours.
 
The average service life is at least 6 years.

 

Operating principle РКС-03ИК

РКС is a system containing one master device (recorder РИ-1) and peripherals. Two types of peripheral devices are used in the РКС: detection unit БДЛГ-04ИК and discrete input block БДВ2-485.

The РИ-01 recorder is designed to control and collect data from peripheral units and performs the following functions:

  • receiving and processing information from discrete input blocks in order to start the measurement process;
  • management of the operation of detection units (generating requests and processing responses from blocks) in accordance with the established operating mode;
  • diagnostics of the health of peripheral units;
  • collecting measurement results for each detection unit and calculating the content of the useful component and determining the grade of ore;
  • accounting of measurement results in a database;
  • display information and keyboard processing.
  • control of discrete outputs of the "dry contact" type to indicate the grade of ore;
  • processing requests from the upper level using the ModBus protocol (ASCII or RTU);
  • control of discrete grade indication signals;
  • search and view data in the database;
  • summing up work per shift or day;
  • background measurement;
  • viewing and changing registrar settings;
  • testing (checking the integrity of the program, parameter block, communication with peripheral blocks, checking the operation of discrete outputs);

The РИ-1 recorder has four main operating modes:

  • measurement of radiation intensity through two independent channels;
  • viewing records;
  • summarizing the shift;
  • background measurement.

The recorder is controlled using a six-button keyboard. Information is displayed on a liquid crystal character indicator (4 lines of 20 characters each). Work with the registrar is arranged in the form of a menu. Additionally, a variety of LED indicators for each channel are installed on the front panel of the recorder.

Fig. 2. The contents of the recorder screen in measurement mode

 

Detection unit БДЛГ-04ИК it is intended for converting the gamma-ray flux into a proportional pulse flux with subsequent processing of this flux by a microcontroller in accordance with the established operating mode of the detection unit. The microcontroller of the detection unit performs the following functions:

  • counting the number of pulses for a certain time interval with subsequent compensation of the background value and conversion using the conversion factor to the required value;
  • formation of the reference value of the threshold of discrimination;
  • monitoring and control of a high-voltage power supply, including voltage stabilization according to a proportional-integral algorithm;
  • processing requests from the master via the RS485 interface;
  • diagnostics of the operation of the nodes of the detection unit.

 

Fig. 3. Photo of detection units БДЛГ-04ИК

Together with the software installed on a personal computer, it is possible to automate the process of calibrating the unit, taking performance data, monitoring the operation of the unit for an extended period of time with saving the taken parameters to a file for further processing. 

 

                               

Fig. 4. Block setup program. Options Panel

Fig. 5. Block setup program. Dashboard

Fig. 6. Block setup program. Plateau removal

Discrete input block БДВ2-485 It is intended for processing discrete signals arriving at its inputs (up to 8 channels). БДВ2-485 performs the following functions:

  • processing of input signals in order to eliminate contact bounce (controlled digital signal filter with parameters for the leading and trailing edges for each channel individually);
  • generating an event along the signal edge specified in the parameters for each channel individually;
  • processing requests from the master via RS485;
  • storage of parameters in non-volatile memory.

To configure the blocks developed appropriate software.

Fig. 7. Block setup program. Discrete Input Block Parameters

 

Distinctive features РКС-03ИК

All peripheral units have an extended supply voltage range (from 9 to 36V) and are galvanically isolated from the mains. The outputs of the RS485 interface also have galvanic isolation and are equipped with protection against impulse noise and short circuit.

The РИ-1 recorder allows you to work with two blocks of discrete inputs and 8 detection blocks per channel (2 independent channels). The РИ-1 recorder software implements the functions of two servers for exchanging information with peripheral units with separate channels at the physical level, that is, one registrar can serve the network via two independent buses. When configuring the recorder for each peripheral unit, the bus address and device address are indicated. Such a network construction allows you to abandon the rigid binding of peripheral units to the measurement channel and, if necessary, to reserve the measurement channels.

A bus cable must use a balanced cable (twisted pair). The need for a shielding in the cable is determined by the level of electromagnetic interference along the cable route. Up to 32 devices with a single typical resistance of the interface circuit can be connected to one bus segment. This cable (additional conductors) also supplies power to peripheral units from a power source, which is installed in the recorder case. Thus, the transfer of information and power to devices on the bus is carried out without intermediate junction boxes and additional power supplies.

The master device and peripheral devices are designed for serial asynchronous data exchange. The system functions correctly at a data exchange rate of 9600 bps.

When using a symmetrical type of cable with a twisted pair of copper wires with a cross-section of 0.2 square mm and a wave impedance of 120 Ohms, the maximum segment length can be 1200 m.

For communication between the РКС and upper-level devices, the ModBus protocol is used (ASCII and RTU implementation is supported) and depending on the physical layer of the network: USB or RS485 interface. If necessary, the РКС can be integrated into SCADA systems through the use of a standard industrial data exchange protocol. The data exchange speed is set in the registrar settings from the standard series (9600, 19200, 38400, 57600 and 115200 bit / s).

We managed to achieve similar results by intelligently combining the modern physical principles of building detectors with the latest circuitry solutions based on the updated elemental base of electronic components. Modern software has been developed for all components of the system.