Uniform regulations are established for the content elements, dimensions, and colors of identifiers on commonly used instruments

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In this post, CHANGHUI Instruments provides in-depth technical information on common instrument labels, electrical labels, and equipment labels, including their content elements, placement locations, sizes, and colors. This information helps instrument technicians use these labels correctly and in a standardized manner in industrial settings. Instrument labels are used to facilitate the identification of instruments; among common instrument labels, only the tag number is typically indicated ； All information must be labeled for all product storage devices ； For interlocks and control warning instrument labels, the principles of visibility and intuitiveness should be applied. The gauge identifier is available at yunrun.com.cn/tech/2272.html. The elements included in the gauge identifier are information such as the device area code, tag number, medium temperature, and pressure; the Chinese characters are displayed in black SimSun font, while the text itself is in red ； English codes and chemical symbols are in regular uppercase letters, colored black with red text; the size, coloring, and labeling of the instrument signs are uniform, aesthetically pleasing, and well-coordinated. The location of instrument markings should be chosen in such a way that they are visible and easy to see, and they must be displayed horizontally. Proper instrument labeling not only facilitates daily management but also enhances the overall safety management of the facility. Changhui Instruments highlights more than twenty common types of instrument labels and provides examples to help those responsible for instrument management to improve the oversight of such equipment and thus ensure safety. 1. Installation of instrument labels on field instruments: For instruments with smaller sizes, such as local indication instruments and transmitters, the label plates are installed by hanging them ； Instrument nameplates should be mounted using clamps; they must not be fixed with wire. Examples are as follows: http://yunrun.com.cn/upload/201811/29/201811292104124389.png 2. Instrument labeling in the control loop: The instrument transmitters and control valve identification tags in the control loop use a blue background with red text; the size of these tags is rectangular, at 100mm×50mm, while the size of the main text is 10mm×10mm. The size of the subsidiary characters is 5mm×5mm, and they are made of 304 stainless steel. http://yunrun.com.cn/upload/201811/29/201811292110327157.png 3. Analysis of sampling points and combustible gas alarm labels: The text is in red on a white background; the label is rectangular in shape, measuring 100mm×50mm. The size of the main text is 10mm×10mm, while the size of the secondary text is 5mm×5mm. Made of 304 stainless steel. http://yunrun.com.cn/upload/201811/29/201811292114505527.png 4. Label for toxic gas detectors: It features a yellow background with black text; the label is rectangular in shape, measuring 100mm×50mm. The main text is 10mm×10mm in size, while the secondary text is 5mm×5mm in size. Made of 304 stainless steel. Background color code: ral 1023 (if not feasible, a stainless steel plate without a background color can be used). http://yunrun.com.cn/upload/201811/29/201811292120245632.png 5. Identification labels for control analysis instruments: The size of the label is rectangular, at 100mm×50mm; the size of the main text is 10mm×10mm, while the size of the secondary text is 5mm×5mm. Made of 304 stainless steel. Background color code RAL 5015 (if not feasible, a stainless steel plate without a background color can be used). http://yunrun.com.cn/upload/201811/29/201811292126271553.png 6. The identification of valves and transmitters in the SIS interlock circuit is done using yellow background with black text; the labels are rectangular in shape, measuring 100mm×50mm, with the text size being 10mm×10mm and the secondary text size being 5mm×5mm. Made of 304 stainless steel. Background color code: ral 1023 (if not feasible, a stainless steel plaque without a background color can be used). http://yunrun.com.cn/upload/201811/29/201811292129502605.png 7. Cable markings: These are in black font and made of 304 stainless steel; the markers are oval-shaped with dimensions of 60mm×30×2mm. See http://yunrun.com.cn/upload/201811/29/201811292137326935.png for more details. 8. Markings for the ground wire connection point: The mark for the ground wire connection point is in the shape of an equilateral triangle, with a black border and black bold text. The drawing standards and parameters are specified at http://yunrun.com.cn/upload/201811/29/201811292145563101.png. 9. Interlock warning markers: To prevent errors by operators and personnel on site, interlock warning signs are installed to remind them to be careful during operations. An example is as follows: font color code ral3020 ； The size is 100mm×50mm, with a font size of 20mm. http://yunrun.com.cn/upload/201811/29/201811292156365633.png 10. Label for the instrument protection box: For those with instrument thermostatic boxes, a label can be placed on the upper part of the front surface of the box, with dimensions of 100mm×50mm. Examples are as follows: http://yunrun.com.cn/upload/201811/29/201811292201020332.png 11. Nameplate markings on control cabinets: For control cabinets in the control room with dimensions of 60mm×38mm, the example is as follows: http://yunrun.com.cn/upload/201811/29/201811292204149797.png 12. Cable markings: ① Indicate the name and number of the equipment ； ②The manually operated isolating switch is installed and fixed 100 mm above the isolating switch operating mechanism ； ③The electric-operated isolating switch is installed and fixed in a prominent position on the door of the operating mechanism box ； ④For operators. 13. Labels for current transformers, voltage transformers, surge arresters, coupling capacitors, etc. ① Indicate the device name and number ； ②For equipment installed on a single bracket, the sign should also indicate the phase; it should be mounted at a height of 1.5 meters above the ground, facing the lines to be inspected ； ③Three-phase equipment mounted on the support frame, placed in a prominent position on the frame’s crossbeam, facing the lines to be inspected during routine checks ； ④For equipment installed on the ground with separate enclosures (such as arresters, reactors, capacitors, transformers, etc.), the signboard shall be installed in the middle of the equipment enclosure, at a height of 1.5 m above the ground, facing the lines to be inspected. 14. Identification of control boxes and terminal boxes: ① Indicate the bay or device name and number ； ②Installed in a prominent position above the control box door and the terminal box door. 15. Grounding switch identification: ① Indicate the equipment name and number ； ②Installed 100 mm above the operating mechanism of the grounding switch ； ③The sign should be facing the operator. 16. Valve identification: ① Indicate the valve name, number, and the direction in which it should be opened or closed ； ②For circular handwheels with a diameter greater than 400 mm, circular signs can be used and installed fixedly in the middle of the handwheel ； ③For handwheels with a diameter of less than 400 mm or non-circular control handles, circular sign plates can be used. The rotation direction of the handwheel is fixed at its middle section ； ④A rectangular sign with a triangular top is used, and it is fixed to the screw on the left side of the valve body gasket ； ⑤There are two ways to label rectangular signs with a triangular top: ◆ The unit number is indicated in the triangular section, while the valve name and number are indicated within the rectangular box ； ◆The triangular area is colored with the medium color to indicate the pipeline system in which the valve is located, while the valve name and number are indicated within the rectangular box. ⑥Rectangular signs are used for sampling and instrument piping groups, which are fixed to the pipe wall beneath the valves using screw tube clamps ； ⑦When there are 10 or fewer instrument tube bundles, the nameplates are arranged horizontally or diagonally. When 10 instrument tubes are loaded, the sign plates are arranged in a V shape. http://yunrun.com.cn/upload/201811/29/201811292217292304.png 17. Equipment identification: ① For large-scale transfer equipment, the width of the outer surface of the equipment is used as a reference; it is required that the size of the identification labels for devices within the same system be standardized, except in cases where there is a significant difference in device sizes, in which case separate specifications should be applied. These labels should be installed on the surface of the equipment’s motor, facing the area to be inspected during routine checks. ②A small transfer device, with the label mounted on its surface and facing the route to be inspected. 18. Valve identification: ① For thermal instruments and chemical sampling valves, the labels are rectangular in shape with dimensions of 70mm * 45mm, and they are fixed to the pipes using screw tube clamps. When the number of thermal instruments and chemical sampling tubes is 10 or less, the nameplates are arranged horizontally or at an angle ； When there are 10 or more thermal instruments and chemical sampling tube arrays, the nameplates are arranged in a V shape. ②The valve labels for other systems are rectangular labels with a triangular top, measuring 100mm in length and 60mm in width, and they are mounted and fixed to the screw on the left side of the valve body’s packing. ③The top of the triangle is colored with the medium color to indicate the pipeline system to which the valve belongs; the equipment name and number are indicated within the rectangular box ； ④The information indicated on the valve must be accurate and positioned centrally within the label. http://yunrun.com.cn/upload/201811/29/201811292217292304.png 19. Direction indicator for gear changes – marked on the housing of rotating equipment ； Marked on the protective cover of the idler wheel of the rotating equipment. 20. Pressure gauge markings: Color zones are defined based on the range of the pressure gauge on the equipment and the pressure range during its normal operation. For example: if the range of the pressure gauge is 0-1.6 MPa, and this gauge is used on a sugar boiling vessel, then during normal operation of the vessel, the pressure level will be between 0.4-0.8 MPa (i.e., 4-8 kilograms of pressure). So, the range of 0–0.4 MPa is the yellow zone, indicating low pressure ； 0.4-0.8 MPa is the green zone, indicating normal pressure ； The range of 0.8–1.6 MPa is the red zone, indicating that the pressure is too high ； After determining the range, cut the labels to an appropriate length based on the color zones, and attach them to the corresponding ranges on the pressure gauge, as shown in the following image: http://yunrun.com.cn/upload/201811/29/201811292226151439.png 21. Grounding label: http://yunrun.com.cn/upload/201811/29/201811292231087443.png http://yunrun.com.cn/upload/201811/29/201811292234106062.png 22. High-voltage warning label: http://yunrun.com.cn/upload/201811/29/201811292240040527.png 23. Directional labels for operations: http://yunrun.com.cn/upload/201811/29/201811292242437260.png These guidelines for instrument labeling are applicable to all instruments and equipment labels within the production areas of Yunnan Petrochemical’s 10-million-ton Anning refinery, and they can serve as a reference for others in the instrumentation industry.