Blocks of detection are intended to measure the power of the ambient dose equivalent Å*(10) of gamma radiation and are used with free-running devices(BDMG-200UD; BDMG-200SD), and systems monitoring the radiological situation.
Output signal corresponds to the standard interface:
• RS – 485 – detection unit BDMG-200 PD
• RS – 422 – detection unit BDMG-200 DD
• RS – 232 – detection unit BDMG-200 SD
• USB 1.1 – detection unit BDMG-200 UD
The contents and the format of the data are defined in the report of the information exchange DiBUS (www.doza.ru)
- Energy range of detected gamma radiation is from 9,6 to 480 fDzh (from 0,06 to 3,0 MeV)
2. Measuring range of ambient dose equivalent H*(10) of gamma radiation is
from 0.1 mkZv / h to 10 Zv / h:
3. The measuring range is divided into two, automatically switching, sub-ranges:
– Subrange “sensitive” channel – from 0.1 mkZv • h-1 to 2.0 mkZv • h-1;
– Subrange “rough” channel – from 0.5 mkZv • h-1 to 10 Zv • h-1.
4. Sensitivity *: “sensitive” channel – (4,4 ± 0,44) at 1 / Zv • h-1
“Rough” channel – (5,0 ± 2,0) at 1 / mkZv • h-1.
5. Limits of basic relative error of the block – ± 20%.
6. Energy dependence * in the range from 9,6 to 200 fDzh (from 0,06 to 1,25 MeV) – no more than 30%
7. Algorithm for processing measuring data – a method of “moving average”. Integration time is 40 seconds. Exposure – 1.
8. Dimensions of the unit: diameter is 40 mm, length is 250 mm.
9. Weight is not more than 0,5 kg.
* Radiation of radionuclide cesium-137 (106 fDzh).
ELECTRICAL CHARACTERISTICS
Power supply – is DC voltage from 7,0 to 12,6 V (detection unit BDMG-200UD – 5,0 V). Consumed current is not more than 10 mA.
Designation of the connector’s contacts (plug RS-10) block BDMG-200PD (RS-485).
| Contact | Signal designation | Commentary | |
| 1 | + Uп | 7,0 – 12,6 V | |
| 2 | f 1 | Negative pulses from the output of the “rough” channel with an amplitude of about 5.0 V, and duration of 1.5 ms | |
| 3 | f 2 | Negative pulses from the output of the “sensitive” channel with an amplitude of about 5.0 V, and duration of 1.5 ms | |
| 4 | TR+ | Direct data | |
| 5 | TR- | Inverse data | |
| 9 | ┴ | Screen is connected to contact 10 | |
| 10 | ┴ | General is connected to contact 9 |
Designation of the connector’s contacts (plug RS-10) block BDMG-200UD (USB 1.1).
| Contact | Signal designation | Commentary | |
| 2 | D- | Inverse data | |
| 3 | D+ | Direct data | |
| 7 | +Uп | Supply voltage is +5V | |
| 9 | ┴ | Screen is connected to contact 10 | |
| 10 | ┴ | General is connected to contact 9 |
Designation of the connector’s contacts (plug RS-10) block BDMG-200DD (RS-422).
| Contact | Signal designation | Commentary | |
| 1 | + Uп | 7,0 – 12,6 V | |
| 4 | Transfer P | Transferring the direct signal | |
| 5 | Transfer I | Transferring the inversed signal | |
| 6 | Receive P | Receiving the direct signal | |
| 8 | Receive I | Receiving the inversed signal | |
| 9 | ┴ | Screen is connected to contact 10 | |
| 10 | ┴ | General is connected to contact 9 |
Designation of connector’s contacts (plug RS-10) block BDMG-200SD (RS-232).
| Contact | Signal designation | Commentary | |
| 1 | + Uп | 7,0 – 12,6 В | |
| 2 | |||
| 3 | D | Data | |
| 9 | ┴ | Screen is connected to contact 10 | |
| 10 | ┴ | General is connected to contact 9 |
STRUCTURE OF DATA REGISTERS
Structure of DIBAS-data registers is shown in the tables 1.1 – 1.4
Table 1.1 – An array of data that can be written or read to / from BDMG-200
| Index | Designation | Range | Writing/Reading | Type of the code |
| 00 | Measured data | [0;∞] | Reading/- | 13 |
| 01 | Efficiency of registration of the sensitive channel | [0;∞] | Reading/writing | 13 |
| 02 | Efficiency of registration of the rough channel | [0;∞] | Reading/writing | 13 |
| 03 | Threshold set point | [0;∞] | Reading/writing | 13 |
| 00 | Dead time of the sensitive channel | [0;250] | Reading/writing | 1 |
| 01 | Dead time of the rough channel | [0;250] | Reading/writing | 1 |
| 02 | Status | [0;254] | Reading/- | 1 |
| 03 | Network address of the device | [0;254] | -/writing | 1 |
| 05 | Switching the channels | [0;2] | Reading/writing | 1 |
.
