This standard specifies the basic parameters, technical requirements and inspection rules for automatic balancing display instruments for industrial process measurement and control systems. This standard applies to electronic automatic potentiometers, balanced bridge recorders and indicators for analog electrical signals for industrial process measurement and control systems. This standard is only applicable to instruments used under general working conditions. Additional technical requirements for instruments used under special working conditions are not within the scope of this standard. This standard also does not include additional requirements for instruments with additional devices. GB/T 9249-1988 Automatic balancing recorders and indicators for industrial process measurement and control systems GB/T9249-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Self-balance recorders and indicators for use in industrial process measurement and control systems
Self-balance recorders and indicators for use in inclusive-process measurement and control systems1 Subject content and scope of application
UDC 681.2:621-503
GB9249-88
Technical standard specifies the basic parameters, technical requirements and inspection rules of self-balanced display instruments for use in industrial process measurement and control systems.
This standard applies to electronic automatic meters and balanced bridge recorders and indicators (hereinafter referred to as instruments in general and as differential meters and correctors respectively) of analog electrical signals for use in industrial process measurement and control systems. The rated input resistance of the potentiometer is not more than 10000: the rated external resistance of the input bridge is not more than 15000. This standard is only applicable to instruments used under general working conditions. The additional technical requirements of instruments used under special working conditions are not within the scope of this standard. This standard also does not include additional requirements for instruments with additional devices. 2 Reference standards
GB 3386
GB4439
Methods for evaluating the performance of electric and pneumatic analog recorders and indicators for industrial process measurement and control systemsT Industrial automation instruments. Vibration of operating parts
ZB Y 002
Basic environmental conditions and test methods for transportation and storage of instruments and metersZB Y 247
Terminology of industrial automation instruments
73 Y 282
Temperature measurement range of display instruments
JB 1399 Arrangement and marking of wiring terminals of industrial automation instruments 3 Basic parameters
3.1 Working atmospheric conditions
The instrument can work normally under the conditions of ambient temperature of 0~0℃ and relative humidity of 10~-90℃. The ambient temperature range of small meters (scale length less than 10mm) can be 0~~40℃. 3.2 Power supply
The instrument shall be powered by an AC power supply with a nominal voltage of 22CV and a nominal frequency of 501Iz. 3.3: Dimensions
The dimensions of the instrument shall comply with the provisions of relevant standards. 3.4 Measuring range
The temperature measuring range of the instrument used to measure temperature with thermocouples and thermal resistors shall comply with the provisions of ZBY282, and the other measuring ranges of the instrument shall comply with the provisions of the manufacturer. 3.5 Terminals
The terminal of the instrument shall comply with the provisions of JB1399. Approved by the State Machinery Industry Commission on May 12, 1988 and implemented on January 1, 1989
4 Technical requirements
4.1 Technical indicators related to accuracy
GB9249--88
The technical indicators related to accuracy shall not exceed the provisions of Table 1. 1
Indication basic error limit
Recording basic error limit
Input voltage of the instrument
Input voltage of the instrument
Recording hysteresis of the recorder
Terminal consistency error limit
Repeatability error limit
【Root mean square value】
4.2 Technical indicators of influencing quantities
4.2.1 Main power supply change
(+0.5 μV)
Accuracy change level
(+0. 5 μV)
(+iμV)
When the power supply voltage changes to 242V and 187V, and the power supply frequency changes to 45Hz and 51Hz, the change of the lower limit value of the instrument is not greater than the absolute value of the basic error limit.
4.2.2 Electrical Interference
4.2.2.1 Common Mode Interference
When a common mode interference voltage with a frequency of 50Hz and an effective voltage of 100V is applied between the input terminal and the ground of a potentiometer or a DC bridge, the change in the lower limit value and the range of the instrument should not exceed 0.5% of the input range. For a potentiometer or a DC bridge with an input range of less than 5mV or a rated travel time of not more than 1s, when a common mode interference voltage with a frequency of 50Hz and an effective voltage of 50V is applied between the input terminal and the battery, the change in the lower limit value and the range of the instrument should not exceed c.5% of the input range or 5 μV (whichever is greater).
Note: The corresponding electrical range of a DC bridge is the product of the current (mA) flowing through the input side resistor and the input voltage (Ω). 4.2.2.2 Series Mode Interference
When a series mode interference voltage with a rated frequency of 5CH and a voltage effective value of 200% of the input power range is applied between the input terminals of the potential difference meter (the peak-to-peak value of the interference voltage does not exceed 1V), the change of the meter's lower limit value from the range should not exceed 0.5% of the input range. 4.2.3 Grounding
Each input terminal of the meter is connected to the ground in turn, and the change of its lower limit value and the meter range should not exceed one-tenth of the indicated basic error limit.
4.2.4 Input external resistance measurement
When the input side external resistance changes from the minimum value to 100Cα, the lower limit value and the change value of the range of the potentiometer should not be less than half of the absolute value of the indicated basic error limit
4.2.5 External magnetic field
GB 9249
Under the influence of the external magnetic field with a magnetic field strength of 400A/m formed by the alternating current with a frequency of 50Hz, in the most unfavorable field phase upward, the lower limit value and the change value of the range of the instrument should not be greater than the allowable change value specified in Table 2
Instrument input range
Instruments with an input range less than 5mV are not subject to this test. 4.2.6 Installation position
Allowable variation
1.0
input on the dial.5
When the instrument is tilted 10° from the normal working position, the change in its lower limit value and the measuring value should not be greater than half of the absolute value of the basic error of the indication, and the recording device of the recording instrument can still work normally. 4.2.7 Overrange
The instrument shall be able to withstand the test of 100% overrange value of input range for 1 min without damage. After the test, the basic error and hysteresis of the instrument indication shall still comply with the provisions of Articles 4.1.1 and 4.1.3. 4.2.8 Ambient temperature
When the ambient temperature changes by 10, the change of the lower limit value and the range of the instrument shall not be greater than the allowable change value specified in Table 3. The allowable change value of the accuracy grade in Table 3 is 0.3 grade, 0.5 grade
0.3(1:01SR)
0.6:1+0.1SR)
For the temperature measuring potentiometer connected with thermocouple and having temperature compensation resistor, the change of the lower limit value and the range of the instrument caused by the change of 1CC of ambient temperature may be increased by 1℃ on the maximum allowable value. Note: SR is the zero drop ratio, and its value is the lower limit value/range. 4.2.9 Wet heat
In an environment with a temperature of 40-2°C and a relative humidity of 91%~-95%, the change in the lower limit value of the meter/range should not be greater than twice the basic error limit.
After the wet heat test, the basic error and hysteresis of the meter should still comply with the provisions of 4.1.1 and 4.1.3. 4.2.10 Tilting
Each bottom edge of the meter is raised to a height of 100mm (or 30°). Let the meter fall freely. After the test, there should be no mechanical damage, and the basic error and hysteresis of the meter should still comply with the provisions of 1.1.1 and 4.1.3. 4.2.11 Mechanical vibration
When the displacement amplitude of the instrument is 0.035 mm and the frequency is within the range of 10~-6C Hz, it should be able to work normally, and the swing amplitude of the wind indication value should not exceed the indication basic error limit. After the vibration test, the instrument should have no mechanical damage, and its indication basic error and hysteresis should still meet the requirements of Articles 4.1.1 and 4.1.3. Instruments with an input current of less than 5m or a rated travel time of not more than 1 are not suitable for this test. 4.2.12 Starting drift
The starting drift of the instrument should not be greater than one-fifth of the absolute value of the indication basic error limit... 4.2.13 Tracking life (operation)
The instrument is operated under an alternating input signal. After completing 10 cycles, its indication basic error and hysteresis should still meet the requirements of Articles 4.1.1 and 4.1.3.
4.3.1 Technical indicators of meaningful safety
4.3.1.1 Insulation resistance
GB 9249-88
When the ambient temperature is 15-35℃ and the relative humidity is 15%-75%, the insulation resistance between the input terminal and the instrument housing, the power terminal and the instrument housing, and the input terminal and the power terminal shall not be less than 20M. 4.3.1.2 Dielectric strength
When the ambient temperature is 15-35℃ and the relative humidity is 45%-75%, the test voltage applied between the terminals of the instrument shall be: input terminal - instrument housing
input terminal - power terminal
power terminal - instrument housing
4.3.2 Recording quality
15c0 V
The recording instrument shall complete 10 cycles. If the test takes more than 21 days, only 21 days shall be tested. The following provisions shall be met during operation: 4. 3. 2. 1
The line width shall not exceed 0.6mm, and the diameter of the two-shaped printing dots shall not exceed 1mm; the dispersion of the printed dots on the recording paper shall not exceed 0.5 of the length of the recording scale: b.bZxz.net
There shall be no broken lines, missed printing, random printing and unclear printing; there shall be no phenomenon of the recording paper falling out, skewing, wrinkling or tearing; d.
The input signal number marked on the conversion switch and the wiring board shall be consistent with the color, dot type or number of the printed dots on the recording paper. e
4.3.2.2 The recording instrument shall meet the following requirements during the test: The recording paper shall not be damaged, and the ink shall not penetrate into the recording paper table; a.
There shall be no water shortage phenomenon:
e. There shall be no ink drops or stains.
4.3.2.3 For recording instruments with a rated travel time greater than 1s, the recording trace shall not be broken in any case. For recording instruments with a rated travel time of less than 1%, the maximum linear speed shall be specified by the manufacturer. 4.3.3 The rated travel time of the instrument shall be specified by the manufacturer. When a step signal of 80% of the input range is applied, the step response time of the instrument shall not exceed the rated travel time. For instruments with a rated travel time of less than 15%, the step response time of 10% of the input range shall not exceed one-fourth of the rated travel time. The overshoot of the recording instrument shall not exceed the absolute value of the basic error limit of the recorder. 4.3.4 The time per point of the multi-point instrument shall be specified by the manufacturer. 4.3.5 Paper feed speed error The paper feed speed error of the recorder at various paper feed speeds shall not be greater than ±0.5% of the set paper feed speed. 4.3.6 Power consumption The maximum power consumption of the recorder shall be specified by the manufacturer. 4.3.7 Resistance to transport environment
The instrument shall meet the requirements of high temperature (+55°C), low temperature (-40°C) and continuous impact in ZBY002 under the transport packaging conditions. After the test, the basic error and tolerance of the instrument shall still meet the requirements of 4.1.14-1.3. Note: The upper limit of normal working temperature is equal to or higher than 10°C. The instrument that has passed the environmental temperature test specified in Article 12.8 does not need to undergo high temperature test.
4.3.8 Appearance
a. The instrument case and parts have good surface treatment. There shall be no rust and stains; b. The scale and dial of the instrument shall be clear and legible, and shall not be incomplete or contaminated with any stain that may affect the reading. 5. Test method
Should comply with the provisions of GB3386,
Inspection rules
GB9249-88
Each instrument shall be inspected and qualified, and shall be accompanied by a product certificate. 6.1
6.2 Factory inspection shall be carried out according to the following items:
Indication cost error (4.1.1):
Record basic error (4.1.2):
Backlash (1.1.3):
Insulation resistance (4.3.1.1);
Insulation strength (4.3.1.2);
Travel time (4.3.3)
Appearance (4.3.3).
6.3 Type inspection
Type inspection should be carried out when the product has any of the following conditions: new product or old product transferred to the factory for trial production and identification a.
After formal production, if there are major changes in structure, materials, and processes that may affect the product and function: once every three years during normal production
When the product is shut down for a long time and then resumes production;
When the inspection results are significantly different from the last type inspection; When the national quality supervision agency proposes the requirement for type inspection, the type inspection should be carried out in accordance with all the requirements of this standard. 7 Storage
The instrument should be placed in a room with an ambient temperature of 0-40 and a relative humidity of no more than 1%. There should be no corrosive and harmful substances in the air. Additional notes:
This standard was drafted by the Shanghai Industrial Automation Instrumentation Research Institute and the Shanghai Industrial Automation Instrumentation Research Institute.
After formal production, if there are major changes in structure, materials, and processes that may affect the product and performance: During normal production, once every three years
When the product is stopped for a long time and then resumes production;
When the inspection results are significantly different from the last type inspection; When the national quality supervision agency proposes the requirement for type inspection, the type inspection shall be carried out in accordance with all the requirements of this standard. 7 Storage
The instrument should be placed in a room with an ambient temperature of 0-40°C and a relative humidity of no more than 1%. There should be no corrosive and harmful substances in the air. Additional notes:
This standard was drafted by the Shanghai Industrial Automation Instrumentation Research Institute and the Shanghai Industrial Automation Instrumentation Research Institute.
After formal production, if there are major changes in structure, materials, and processes that may affect the product and performance: During normal production, once every three years
When the product is stopped for a long time and then resumed;
When the inspection results are significantly different from the last type inspection; When the national quality supervision agency proposes the requirement for type inspection, the type inspection shall be carried out in accordance with all the requirements of this standard. 7 Storage
The instrument should be placed in a room with an ambient temperature of 0-40°C and a relative humidity of no more than 1%. There should be no corrosive and harmful substances in the air. Additional notes:
This standard was drafted by the Shanghai Industrial Automation Instrumentation Research Institute and the Shanghai Industrial Automation Instrumentation Research Institute.
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