LS/T 1809-2017Grain and oil storage. Monitoring and control system of stored-grain condition General Requirements (English PDF)

4.1 Compilation principles

It is compiled according to system signature, communication method, manufacturer code and product serial number.

4.2 Preparation method

4.2.1 Format

System signature

way of communication Manufacturer code Product serial number

4.2.2 System Feature Code

It is represented by the initials LQ of the Chinese alphabet of food.

4.2.3 Communication method

"1"---wired mode; "2"---wireless mode; "9"---other communication methods.

4.2.4 Manufacturer Code

Expressed in Chinese Pinyin, as defined by the manufacturer of the product.

4.2.5 Product serial number

Expressed in Arabic numerals and defined by the manufacturer of the product.

5.1 System composition

The system consists of two parts. hardware and software. The hardware generally includes the host computer, transmission interface, extension, grain sensor, actuator, and controlled Equipment, temperature measuring cables and other necessary components. The software includes system software and special software for grain monitoring and control. The typical structure is shown in Figure 1.

Figure 1 Typical structure of the system

5.2 Requirements of each part

5.2.1 Communication method

Communication can be done in wired or wireless mode.

5.2.2 Host computer

Computers that comply with relevant national standards are equipped according to system and user requirements.

5.2.3 Transmission Interface

It has two-way communication and display functions and lightning protection functions between the upper computer and the extension, and the communication protocol conforms to LS/T 1812 (information exchange) Port protocol) requirements.

5.2.4 Extension

Should meet the requirements of LS/T 1810 (extension).

5.2.5 Software

Should meet the requirements of LS/T 1811 (software).

5.2.6 Sensor arrangement

5.2.6.1 Grain temperature sensor

According to different warehouse types, the grain temperature sensor can be arranged as follows.

a) The distance between the horizontal and vertical temperature measuring cables of the flat warehouse is not more than 5m, and the distance between the vertical grain temperature sensors is not more than 2m.

Surface, warehouse bottom, warehouse wall 0.3m~0.5m.

b) The shallow round silo and the vertical silo temperature measuring cable are arranged in a ring shape, and the adjacent cable spacing in the horizontal direction is not more than 5m, and the vertical spacing is not large.

At 3m, from the grain surface, the bottom of the warehouse, the wall of the cylinder is 0.3m~0.5m.

c) At least one temperature measuring cable is arranged in the oil tank. The vertical distance between the temperature sensors is not more than 3m, and the oil level and the bottom of the tank are 0.3m~ 0.5m.

d) Other warehouse types are arranged according to the above principles.

5.2.6.2 Warehouse temperature and warehouse wet sensor

According to different warehouse types, the warehouse temperature and moisture sensor can be arranged as follows.

a) One temperature and humidity sensor is installed in each compartment of the flat warehouse, which is placed in the center of the space above the grain surface (designed grain surface).

b) 1 separate temperature and humidity sensor in each independent single warehouse and star warehouse, which should be arranged on the upper surface of the grain surface (designed grain surface) Central location.

c) One small temperature and humidity sensor in each independent single warehouse, which should be placed in the center of the space above the grain surface (designed grain surface) position.

d) Other warehouse types are arranged according to the above principles.

5.2.6.3 Temperature and humidity sensor

A louver box is installed in the open area of the reservoir area, and a built-in temperature and humidity sensor is arranged at 1.5 m from the ground.

5.2.6.4 Gas concentration detection point

The gas storage warehouse should use the piping system to pump the gas in the warehouse to the outside of the warehouse and use a gas analyzer for testing. The gas concentration detection point can be as follows Request layout.

a) A total of 10 inspection points are arranged in the upper, middle and lower layers of the inner food compartment of each compartment and the space. On the diagonal of the warehouse the detection points are arranged at 7 m, 3 m from the two corners and 3 positions in the middle of the warehouse, and 3 inspections are arranged for different grain depths in each position.

Point. the upper layer of the grain pile (3/4 heap height), the middle layer (1/2 of the pile height), and the lower layer (1/4 of the pile height). 1 check in the airbag or space the measuring point is located in the airbag or 1m above the center of the grain surface.

b) Shallow round warehouses Each independent single warehouse inner grain heap is divided into upper and lower layers and a total of 10 inspection points are arranged in space.

5 points are arranged at 1m, 4 points are laid at the deepest point of the sample, and 1 point is arranged in the space. Grain surface location. East (out of the warehouse wall 1m~2m), south (middle point of radius), west (1m~2m from warehouse wall), north (midpoint of radius), middle (center) A detection point is arranged. The location of the lower layer. East (the midpoint of the radius), South (1m~2m from the wall), West (the midpoint of the radius), Four north (outside the warehouse wall 1m~2m). The space concentration detection point is set at 1m above the center of the grain surface.

c) Other warehouse types are arranged according to the above principles.

d) Using the detection of carbon dioxide concentration for the prediction of the grainworm, it is possible to increase the detection point reasonably based on the above-mentioned principle.

5.2.6.5 Other grain detection sensors

The layout principles of other grain detection sensors such as moisture, stored grain pests, and phosphine are reasonably arranged according to needs.

5.2.6.6 Grain sensor sequencing method

Should meet the requirements of LS/T 1811 (software).

5.2.7 Temperature measuring cable

Should meet the requirements of LS/T 1813 (digital temperature measurement cable).

6.1 General requirements

The grain condition monitoring and control system and various equipment shall comply with the provisions of this standard and related standards, and shall be approved in accordance with the prescribed procedures.

manufacture.

6.2 Operating environment

6.2.1 Equipment used in the control room or machine room in the system shall work normally under the following conditions.

a) Ambient temperature. -10 ° C ~ 45 ° C;

b) Ambient humidity. relative humidity 40%~90%, and no condensation;

c) atmospheric pressure. 80kPa~106kPa;

d) Relevant provisions of GB/T 2887.

6.2.2 Equipment used inside and outside the granary shall work normally under the following conditions.

a) Ambient temperature. -40 ° C ~ 60 ° C;

b) relative humidity. no more than 95%;

c) atmospheric pressure. 80kPa~106kPa;

d) Phosphine gas concentration. no more than 2500mL/m3 (only for equipment that must be placed in the granary during fumigation, such as temperature measuring cable, Intermediate devices, interconnects, connectors, etc.).

6.3 Power supply

6.3.1 AC power for control room and room equipment.

a) Rated voltage. 220V/380V, tolerance ±10%;

b) Harmonic. no more than 5%;

c) Frequency. 50 Hz, tolerance ± 5%.

6.3.2 AC power supply for equipment inside and outside the warehouse.

a) Rated voltage. 36V/127V/220V/380V, tolerance ±16%;

b) Harmonics. no more than 10%;

c) Frequency. 50 Hz, tolerance ± 5%.

6.3.3 DC power supply.

a) Remote power supply voltage. 9V~36V, voltage tolerance. ±15%;

b) Local supply voltage. standard DC safety voltage, tolerance. ±15%.

6.4 Basic functions

6.4.1 Grain condition detection

--- Features to detect temperature, humidity, other parameters and the status of the controlled device.

--- With timing detection, real-time detection.

6.4.2 Analysis of food situation

--- It has the functions of automatic analysis, judgment of grain storage status, indication of abnormal parts of grain and abnormal values.

--- Have different date and different warehouse grain comparison function.

--- Have the ability to predict trends in food conditions.

6.4.3 Data storage and retrieval

It has the functions of grain data storage, historical data query and network sharing.

6.4.4 Data display

It has the function of displaying the food data table and graphics.

6.4.5 Data Printing

Print function with grain data table and graphics.

6.4.6 Alarm

6.4.6.1 It has manual setting temperature, humidity alarm limit and over limit alarm function.

6.4.6.2 It has automatic alarm function based on the technical requirements of GB/T 29890 and LS/T 1202.

6.4.7 Grain control

With the technical requirements of grain storage such as GB/T 29890 and LS/T 1202 and the corresponding analysis results, the system controlled equipment is suitable Time control function.

6.4.8 Troubleshooting

It has the function of self-diagnosis of the system itself.

6.4.9 Network function

With network operation function, it can detect, analyze and control grain situation through user local area network, private network or internet.

6.4.10 Expansion function

It has the function of detecting the expansion of water, stored grain pests, phosphine, oxygen, carbon dioxide and other parameters.

6.5 Main technical indicators

6.5.1 System Capacity

6.5.1.1 Number of grain temperature detection points. >= 10000 points.

6.5.1.2 Number of humidity detection points. >=500 points.

6.5.1.3 Number of moisture detection points. >=.2000 points.

6.5.1.4 Number of worm detection points. >=.2000 points.

6.5.1.5 Number of phosphine concentration detection points. >=500 points.

6.5.1.6 Number of oxygen concentration detection points. >=500 points.

6.5.1.7 Number of carbon dioxide concentration detection points. >=500 points.

6.5.1.8 The number of extensions should be reasonably set according to the actual situation of the distribution of warehouses and the warehouse area in the warehouse. It should be selected in 4, 8, 16, 32.

6.5.1.9 The number of controlled devices should be selected in 8, 16, 32, 64, 128; in a system separated by repeaters and other devices into multiple segments, each segment is allowed the number of accesses should be selected from 8, 16, 32, 64, and 128.

6.5.2 Detection range

See Table 1 for the detection range and error requirements of the grain condition measurement indicators.

Table 1 System detection range, error requirements

Test Index Temperature/°C Relative Humidity /% Moisture /% Burmese/Head Phosphine/(mL/m3) Oxygen /% Carbon Dioxide /% Detection range -40~ 60 10~99 5~30 0~500 0~2500 0~25 0~100 Error <=±0.5 <=±3 <=±0.8 <=±10% <=±5 <=±0.5 <=±0.5 Note. The user can also determine the detection range and detection error requirements of the grain condition measurement and control system according to the actual situation in the local area.

6.5.3 Detection speed

The speed from the issuance of the detection command to the output of the display result should be no less than 50 points/s.

6.5.4 Control response time

The time from the issuance of the control command to the response of the controlled device shall be no more than 10 s.

6.5.5 Communication distance

The maximum transmission distance between the host computer (transport interface) and the extension is not less than 3km; the transmission between the extension to the sensor or the controlled device the distance should be no less than 0.2km.

6.6 Power fluctuation adaptability

When the supply voltage changes within the specified voltage fluctuation range, the basic functions and main technical indicators of the system are not lower than the requirements of this standard.

6.7 Working stability

The system power-on test time is not less than 7d, and the basic functions and main technical indicators of the system are not lower than the requirements of this standard.

6.8 Reliability

The average trouble-free operation should be no less than 5000h.

6.9 Anti-interference

6.9.1 The test shall be carried out in accordance with the conditions specified in the electrostatic discharge immunity test of the severity class 2 (contact discharge) in GB/T 17626.2.

The basic functions and main technical indicators of the system are not lower than the requirements of this standard.

6.9.2 The test shall be carried out in accordance with the conditions specified in the radio frequency electromagnetic field immunity test of Class 3 in GB/T 17626.3.

The basic functions and main technical indicators of the system are not lower than the requirements of this standard.

6.9.3 The test shall be carried out in accordance with the conditions specified in GB/T 17626.4 for the fast transient burst immunity test of class 3 the basic functions and main technical indicators of the system are not lower than the requirements of this standard.

6.9.4 The test shall be carried out in accordance with the conditions specified in the pulse (impact) immunity test of the severity class 3 in GB/T 17626.5.

The basic functions and main technical indicators are not lower than the requirements of this standard.

6.9.5 The equipment in the warehouse should be able to pass the relative humidity of 60%~95%, the temperature of 20 °C~35 °C, and the dosage of the dosage is 12g/m3 (space) Under the condition of 56% aluminum phosphide tablet or pellet, the anti-fumigation corrosion test of closed fumigation for 7 days, the basic functions of the equipment and the main technical indicators the standard is not lower than the requirements of this standard.

6.10 Explosion-proof

The measuring and controlled devices installed in the dusty area of shallow round silos and vertical silos shall meet the requirements of GB 17440.

7.1 Experimental conditions

7.1.1 Environmental conditions

a) Ambient temperature. 5 ° C ~ 45 ° C.

b) Ambient humidity. relative humidity 45%~85%.

c) Atmospheric pressure. 86kPa~106kPa.

7.1.2 Power conditions

7.1.2.1 AC power supply

a) Rated voltage. ±10% tolerance.

b) Harmonics. no more than 5%.

c) Frequency. 50 Hz, tolerance ± 5%.

7.1.2.2 DC power supply

a) Rated voltage. allowable deviation -10%~ 10%.

b) Voltage ripple. no more than 0.1%.

7.2 Equipment requirements

7.2.1 At the time of factory inspection and type inspection, the system test shall have at least the following equipment.

a) A set of upper computer, including various transmission interfaces;

b) if there are multiple types of extensions or equipment with extension functions, at least one of each;

c) each extension shall be connected to various sensors and other equipment of maximum load;

d) Other necessary equipment that constitutes the system.

7.2.2 System Connection.

--- Use the specified transmission line (or simulation line) to connect according to system design requirements.

--- The simulation line of the upper computer and extension, and sensor and actuator needs to simulate the maximum transmission distance and power supply distance of the system.