Tank-side display instrument

Abstract

The utility model relates to a display instrument beside a tank, which comprises a numerical control meter, a cover and a mounting base, the numerical control meter comprises a display meter head and a wiring board, the back surface of the display meter head is provided with three plugs which are plugged with the wiring board, two of the three plugs are used as a current input port and a current output port, and the other plug is connected with 0V of 24VDC. An alarm control line terminal socket is further arranged in the middle of the back face of the display meter head and connected with a wiring board through an alarm control line, and wiring terminals are further arranged on the wiring board and used for being connected with a transmitter, an external power source and an actuator. Through operation of two keys, setting of a zero point, a full scale, a decimal point, a unit symbol and the like and reference calibration are realized without potentiometers and other adjustments, external power supply is not needed, and quantity information corresponding to different electric signals in a measured loop can be accurately displayed only by being connected in series in the measured loop.

Description

Technical Field

[0001] The utility model belongs to the technical field of display instruments, in particular to a tank-side display instrument. Background Art

[0002] The tank-side display is a device used to monitor and display the liquid level or other parameters in the tank. It is usually connected to a radar level meter, a material level meter, or a liquid level meter to obtain the data in the tank and convert it into a visual form for accurate display on the display. The operator can observe the numbers on the display to understand the situation inside the tank so as to make corresponding operations or decisions. The lack of an alarm function makes the monitoring work inflexible, and it is easy for the staff to miss inspections and fail to perform maintenance on the tank in a timely manner. Utility Model Content

[0003] The utility model proposes a tank-side display instrument, aiming to provide a tank-side display instrument with an alarm function, which can solve the problem of inflexible monitoring work.

[0004] The specific technical solutions are as follows:

[0005] A tank-side display instrument comprises a numerical control meter, a cover and a mounting base. The numerical control meter uses an LCD liquid crystal display screen to display information and is arranged between the cover and the mounting base. The numerical control meter comprises a display head and a wiring board. Three plugs are arranged on the back of the display head to be plugged into the wiring board, two of which are used as current input ports and current output ports, and the other plug is connected to 0V of 24VDC. An alarm control line terminal socket is also arranged in the middle position on the back of the display head, which is connected to the wiring board using an alarm control line. The wiring board is also provided with wiring terminals for connecting to a transmitter, an external power supply and an actuator.

[0006] Preferably, the mounting base is provided with three limiting mechanisms, and the angle between two adjacent limiting mechanisms is 120°.

[0007] Preferably, limiting holes are respectively arranged on the limiting mechanism, and the diameter of the circle formed by connecting the limiting holes is 136 mm; the straight-line distance between the centers of any two limiting holes is 117.8 mm, and the distance between the extended line of the connecting line of the centers of any two limiting holes and the two intersection points of the boundary of the limiting mechanism is 138 mm.

[0008] Preferably, the length from the bottom of the mounting base to the top of the limiting mechanism at the top of the mounting base is 122 mm.

[0009] Preferably, the numerical control table is provided with two function keys, an "o" key as a selection key, and the other "M" key as a modification key.

[0010] The utility model provides a tank-side display instrument, which has the following beneficial effects: the display meter is suitable for all two-wire transmitters, does not require external power supply, and only needs to be connected in series in the measured circuit to accurately display the quantity information corresponding to different electrical signals in the measured circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of the appearance structure diagram of a tank-side display device of the utility model;

[0012] Figure 2 This is a side view of the appearance structure of a tank-side display device of the utility model;

[0013] Figure 3 This is a two-wire 4-20mA external measurement connection method of a tank-side display instrument of the utility model;

[0014] Figure 4 This is a two-wire 4-20mA connection method for a tank-side display device of the utility model, which does not require external measurement;

[0015] Figure 5 This is a three-wire 4-20mA external measurement connection method of a tank-side display instrument of the utility model;

[0016] Figure 6 This is a three-wire 4-20mA connection method of a tank-side display instrument of the utility model, which does not require external measurement;

[0017] Figure 7 This is a method of connecting the alarm N polarity of a tank-side display device of the utility model;

[0018] Figure 8 The utility model discloses an alarm P polarity connection method of a tank-side display instrument.

[0019] In the figure: 1. CNC table; 2. Cover; 3. Mounting base; 4. Limiting mechanism. DETAILED DESCRIPTION

[0020] The present embodiment will be further described in detail below with reference to the accompanying drawings.

[0021] As shown in the accompanying drawings, the utility model provides a tank-side display, including a numerical control meter 1, a cover 2 and a mounting base 3. The numerical control meter 1 uses an LCD liquid crystal display screen to display information and is arranged between the cover 2 and the mounting base 3. The numerical control meter 1 includes a display head and a wiring board. Three plugs are provided on the back of the display head to connect with the wiring board, two of which are used as current input ports and current output ports, and the other plug is connected to 0V of 24VDC. An alarm control line terminal socket is also provided in the middle position on the back of the display head, which is connected to the wiring board using an alarm control line, and the wiring board is also provided with wiring terminals for connecting to a transmitter, an external power supply and an actuator.

[0022] Exemplarily, the collector of the optocoupler output amplifier is connected to the power supply E+ through the relay coil, and the emitter is connected to E-, forming an effective amplification circuit. When an alarm signal is input to the optocoupler input end, the light signal generated inside the optocoupler acts on the photoelectric amplifier, generating an amplified current in the output circuit that passes through the relay coil. The relay is energized, closing the normally open contacts and connecting the power supply circuit from the power supply E to the actuator, and the actuator starts working. When the alarm signal disappears, the currents in the above two circuits disappear at the same time, and the actuator stops working.

[0023] Exemplarily, the mounting base 3 is provided with three limiting mechanisms 4, and the angle between two adjacent limiting mechanisms 4 is 120°; limiting holes are respectively provided on the limiting mechanisms 4, and the diameter of the circle formed by connecting the limiting holes is 136 mm; the straight-line distance between the centers of any two limiting holes is 117.8 mm, and the distance between the extended line of the connecting line of the centers of any two limiting holes and the two intersection points of the boundaries of the limiting mechanisms 4 is 138 mm; the length from the bottom of the mounting base 3 to the top of the limiting mechanism 4 at the top of the mounting base is 122 mm.

[0024] For example, the use conditions of CNC meter 1 must meet the following requirements: the measurement range of the current is 3 to 22 mA, while the limit range of the current is less than 100 mA; the rated use range of the temperature of CNC meter 1 is -20°C to 60°C, and the limit storage range of the temperature is -40°C to 70°C; the relative humidity is within the range of 20% to 90% RH; and the impact and vibration must comply with the requirements of the instruments of Group II of the environmental experiment of the Ministry of Electronics Industry.

[0025] Exemplarily, the display content of the numerical control meter 1 is black digits, decimal points and unit symbols, with a character height of 14.2 mm; and the symbol display includes kPa, MPa, %, m, ℃, Bar, PSI, and the analog bar display is 10 segments (21 states) 0~100%.

[0026] Exemplarily, the sampling rate of the numerical control table 1 is 5 times / second.

[0027] Exemplarily, there are two situations of voltage drop in normal use of the CNC meter 1. When the voltage drop is less than or equal to 3.2V, the current is 20mA, and the CNC meter 1 has no overcurrent protection; when the voltage drop is less than or equal to 4V, the current is 20mA, and the CNC meter 1 has overcurrent protection.

[0028] For example, the digital display setting range of the numerical control table 1 is -1999 to 9999, and the setting error is ±2 characters.

[0029] For example, the negative signal of the numerical control meter 1 automatically displays "-", the positive signal is displayed without a sign, and the full-scale linear deviation is ≦±2 characters.

[0030] For example, the temperature influence error of the numerical control meter 1 within the rated temperature range is full scale ≦ 50 ppm / °C, and the zero drift is ≦ 5 words.

[0031] Exemplarily, the over-range indication of the numerical control meter 1 is "-HI-" or "-LO-".

[0032] Exemplarily, the CNC table 1 is provided with two function keys, one "o" key is used as a selection key to switch menus and move the flashing position in the menu setting; the other "M" key is used as a modification key to enter the menu, modify the flashing position, execute, modify the setting, etc. in the menu setting; in any menu except the advanced setting, long press the "o" key for 3 seconds to save the current setting and exit, and in any setting menu, the measuring state will be automatically restored if no key operation is performed for 10 seconds. In the measuring state, press "o" once, the display will switch to the current current value for 3 seconds, and the measuring state will be automatically restored after 3 seconds.

[0033] Menu 1: Measurement setting menu, password 0011; in the measurement state, press "o" and "M" simultaneously for three seconds to enter the password state, press the "o" key to shift, and the "M" key to add numbers to enter the password. After setting the value to 0011, press and hold the "o" key to enter the measurement setting menu. In this menu, press "o" to scroll through the menus, and press "M" to enter the submenu settings:

[0034] (SE-1): 4mA display value setting. After entering this menu, press "o" to switch the flashing digit, and press M to add the number to the flashing digit. If the number is exceeded, continue to press to the next cycle. After setting, press and hold "o" for three seconds to save and exit.

[0035] (SE-2): 20mA display value setting, refer to (SE-1) for setting after entering.

[0036] (SE-3): Decimal point setting. After entering this menu, press "M" to move the decimal point. After setting, press and hold "o" for three seconds to save and exit.

[0037] (SE-4): Unit symbol setting. After entering this menu, press "M" to move the unit symbol position. After setting, press and hold "o" for 3 seconds to save and exit.

[0038] Menu 2: Alarm setting menu, password 0022; similar to the password input method of menu 1, enter the password 0022 and long press the "o" key to enter:

[0039] (AL-1): Alarm point 1 critical value setting. After entering this menu, press "o" to switch the flashing digit, press "M" to add the number to change the flashing digit. After setting, press and hold "o" for three seconds to save and exit.

[0040] (AL-2): Alarm point 2 critical value setting. After entering, refer to (AL-1) for setting.

[0041] (AL-3): Alarm delay setting. After entering this menu, press "o" to switch the flashing position, press "M" to change the flashing position by increments. After setting, press and hold "o" for three seconds to save and exit. The maximum setting is 0 to 99 seconds. Setting it to 0 means no delay. After setting the delay, when the alarm condition is met, the alarm will not be triggered immediately. Instead, the displayed value will continue to meet the alarm condition for several seconds before entering the alarm state. When the display returns to the non-alarm value, it also needs to continue for several seconds before the alarm state is lifted.

[0042] (AL-4): Alarm hysteresis value setting. After entering this menu, press "o" to switch the flashing digit, press "M" to add the flashing digit, and press "o" for three seconds to save and exit after setting. Setting 0 means no hysteresis. For example, if Alarm 1 is set to 3000↑ and AL-4 is set to 200, the alarm state will be entered when the value exceeds 3000. The alarm state will not be lifted when the value displays 2999 until the value displays less than 2800.

[0043] (AL-5): Alarm point status setting. After entering this menu, press "o" to switch the flashing position, and press "M" to change the flashing position. The first flashing position corresponds to alarm point 1, and the second flashing position corresponds to alarm point 2. The flashing position has three states, namely "——" (no alarm), LO (alarm below the critical value), and HI (alarm above the critical value).

[0044] Menu 3: Advanced settings menu, password 0033; similar to the password input method of menu 1, enter the password 0033 and long press the "o" key to enter:

[0045] (SP-1): 4mA standard sampling calibration. After entering this menu, the table displays 0.004. Input the standard 4mA current signal. Press "M" and it will automatically return to "Menu 3" after one second. At this time, the currently input 4mA current signal sampling has been saved as the standard.

[0046] (SP-2): 20mA standard sampling calibration. After entering this menu, the table displays 0.020. Input the standard 20mA current signal. Press "M" and it will automatically return to "Menu 3" after one second. At this time, the currently input 20mA current signal sampling has been saved as the standard.

[0047] (SP-3): Initialization settings. After entering, press "M" to reset all settings of CNC table 1. This function is only used when the function of CNC table 1 is disordered due to unknown circumstances and cannot be restored through normal settings. After use, the settings of (SP-1), (SP-2), and (SE-1~4) will be lost and need to be reset.

[0048] The above are only preferred embodiments of the present invention and do not limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tank-side display instrument, comprising a numerical control meter (1), a cover (2) and a mounting base (3), characterized in that: The numerical control meter (1) is arranged between the cover (2) and the mounting base (3), and the numerical control meter (1) comprises a display meter head and a wiring board, and three plugs are arranged on the back of the display meter head for plugging into the wiring board, two of which are used as current input ports and current output ports, and the other plug is connected to 0V of 24VDC, and an alarm control line terminal socket is also arranged in the middle position of the back of the display meter head, which is connected to the wiring board by an alarm control line, and the wiring board is also provided with wiring terminals for connecting to a transmitter, an external power supply and an actuator.

2. A tank-side display according to claim 1, characterized in that: The mounting base (3) is provided with three limiting mechanisms (4), and the angle between two adjacent limiting mechanisms (4) is 120°.

3. A tank-side display according to claim 2, characterized in that: The limiting mechanism (4) is respectively provided with limiting holes, and the diameter of the circle formed by connecting the limiting holes is 136 mm; the straight-line distance between the centers of any two limiting holes is 117.8 mm, and the distance between the extended line of the connecting line of the centers of any two limiting holes and the two intersection points of the boundary of the limiting mechanism (4) is 138 mm.

4. The tank-side display according to claim 1, characterized in that: The length from the bottom of the mounting base (3) to the top of the limiting mechanism (4) at the top of the mounting base is 122 mm.

5. The tank-side display according to claim 1, characterized in that: The numerical control table (1) is provided with two function keys, an "o" key as a selection key, and the other "M" key as a modification key.

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