4-20mA liquid level display controller

1、 Overview of Intelligent Single Row Four Position Measurement and Control Instrument

This series of products adopts surface packaging modular technology, greatly improving the resistance of instruments. It has functions such as display, control, transmission, communication, and signal input, and is suitable for displaying and controlling various physical quantity detection signals such as temperature, humidity, pressure, liquid level, instantaneous flow rate, and speed. It can also perform high-precision linear correction on various nonlinear input signals. It can be widely used in fields such as electricity, metallurgy, chemical industry, petrochemicals, paper printing and dyeing, brewing, tobacco, aerospace bases, etc.

By adopting jumper free technology, the input port is equipped with * signal input function. By changing the internal parameters, multiple input signals (various thermocouples, thermal resistors, remote pressure, mV, standard voltage/current signals) can be easily switched between. The circuit board has been optimized in design and continuously improved in production process, reducing temperature drift and enhancing anti-interference performance to ensure the stability and reliability of the product during operation. Adopting high brightness LED digital display and high-resolution light column display (proportional display), the display of measurement/control values is clearer and more intuitive.

The output circuit adopts photoelectric isolation, which has strong resistance. It can be equipped with a serial communication interface and can communicate bidirectionally with various devices with serial interfaces to form a network control system. It has multiple standard external dimensions and can be applied to various measurement and control scenarios. The whole machine adopts a snap in structure, which is very easy to install.

Scope of Application

YK-11 intelligent digital display control instrument is an intelligent and high-precision digital display measuring instrument for controlling physical quantities such as temperature, pressure, liquid level, force, torque, displacement, etc. It can be paired with temperature, pressure, liquid level, force, torque, displacement sensors and transmitters to form temperature, pressure, liquid level force, torque, displacement measurement and control systems of various ranges and specifications. It can measure various parameters such as voltage, current, speed, frequency, etc., and can be combined with PLC frequency converters to form various measurement systems. It can have peak and valley values. Please call to explain your order. )

Features

*Input function (signal type can also be inputted by the customer)

Automatic calibration and manual calibration functions.

Multiple protection, isolation design, strong resistance, high reliability, stable acquisition, and a good software platform with secondary development capabilities to meet the modular structure of special functions. Combined with powerful instrument cores, functional combinations and system upgrades are very convenient

2、 Main technical specifications of intelligent single row four position measurement and control instrument：

Basic error: 0.2% FS, 14 bit A/D converter (the largest 18 bit A/D converter, please specify when ordering).

Input signal: Thermocouples: B, S, K, E, J, T, WRe, etc

·热电阻: Pt100、Cu50、Cu53、Cu100、BA1、BA2

·Current: 0-10mA, 4-20mA, etc. (input impedance ≤ 250 Ω)

·Voltage: 0-5V, 1V-5V, mV, etc. (input impedance ≥ 1M Ω)

·Remote pressure resistance: (0-400) Ω

Sampling period: 0.2S (10-200 times/second, user selectable)

Display: Double row four digit LED digital display. Single row 4-digit LED digital display

Alarm output:The instrument can be equipped with multiple relay outputs, with relay contact capacities of AC220V/5A or AC220V/1A. Zui can carry up to 16 relays,Upper and lower limit control can be selected, and the control set value and hysteresis value can be freely set within the full range

Transmission output: 4-20mA, 0-10/20mA (load resistance ≤ 250 Ω, indicate if the load is too large)

1~5V, 0-5V, 0-10V (load resistance ≥ 200K Ω).

adopt12Digital D/A chip with isolated output.

Communication output: Isolated communication interface RS485/RS232 baud rate 1200-9600bps

Print output: RS232 interface, TTL interface.

Feed output: DC24V/30mA, DC12V/30mA

Temperature compensation: 0-50 cold end temperature automatic compensation, error: ± 1 ℃

Power supply: Switching power supply 85-265VAC or DC24V or DC12V

Power consumption: 4W

Environmental temperature:（-20～70)℃ (Start up and run at room temperature)30minutes later,Can gradually withstand extreme temperatures)

(0～50)℃ (thermocouple signal input)

Relative humidity: ≤ 85%. No condensation. Avoid use in corrosive and flammable/explosive gases

Panel dimensions: 160mm × 80mm, 96mm × 96mm, 96mm × 48mm

72mm×72mm、48mm×48mm

(Our company independently develops and produces various types of instruments with complete functions. If users can choose to sample quickly, the fastest one can reach 200 times/second, with high-precision 18 bit and 24A/D acquisition, high-precision 16 bit D/A output, input signal 20 segment curve correction, full 5-digit or 6-digit display, LCD display, special input signals, multiple relay alarm buzzer outputs, high-power feed output, etc. Please specify when ordering.)

3、 Model Description of Intelligent Single Row Four Position Measurement and Control Instrument

Model example: YK-11AJ2O1SV24-4-20

YK-11Series intelligent single channel display regulator, with external dimensions of 160 × 80 × 125mm (opening 150 × 75mm), dual row 4-digit LED display, two relay alarm control outputs, 4-20mA transmission output, with RS485 isolated communication interface, DC24V feeding output, input signal 4-20mA, power supply85~265VAC（110~300VDC）。

4、 Terminal wiring of intelligent single row four position measuring and control instrument

⑴ A, A/D specification instrument with dimensions of 160 × 80 × 125

Note: ⑴ The input signals are thermocouple and voltage signals, with the same wiring method

⑵ The input signals are thermal resistance and remote transmission resistance, which must be connected in a three wire system

For instruments with special requirements, please refer to the random wiring diagram for the wiring method.

5、 Operating instructions

（1） Key function

● - Manual printing key or other special purpose.

■When setting the state, it is used to switch between displaying parameter prompts and corresponding set values.

En- Parameter setting key, used to store the new set value of the parameter and enter the next set parameter when in the setting state.

▲ - Set value increase key, used to increase the numerical value in the set state.

▼ - Set value increase key, used to decrease the value when in the set state.

（2） Power on self-test

Connect the wiring of the instrument according to the terminal diagram, and only turn on the power after it is correct. After the instrument self-test, if it displays -, it indicates that there is no signal received, the input signal exceeds the range, or the input signal type is set incorrectly. The instrument adopts a human-machine dialogue form to input parameters, and various prompts are used to indicate the data that should be input.

（3） Parameter setting

In working mode, the upper row displays the measured values, while the lower row displays them according to the settings. In the set state, the upper row of the instrument displays the parameter prompt, and the lower row displays the set value. If the parameters are not changed for about 20 seconds during the setting process, the instrument will automatically return to operation. After setting a parameter, press the En key to confirm and enter the next parameter setting state.

The parameter settings are as follows:

(1)Press the En key, Loc will appear on the upper display window, and oFF will be displayed on the lower display window. To modify the alarm point setting value, press the ▲ key to change oFF to on. When Loc is set to oFF, the alarm point setting value cannot be modified and can only be browsed.

(2)J1HAJ1 relay alarm point setting value (this item is turned off when J1-H is set to OFF).

(3)J1HFJ1 relay alarm reset value (this item is turned off when J1-H is set to OFF).

(4)J2HAJ2 relay alarm point setting value (this item is turned off when J2-H is set to OFF).

(5) J2HF: J2 relay alarm reset value (this item is turned off when J2-H is set to OFF).

Set the alarm parameters for J3 and J4 in sequence.

After the alarm settings are completed, a password is required to enter the secondary parameter settings.

(6)Cd- Password, use the ▲ or ▼ keys to set 800 to 808, then press the En key to enter the parameter setting state. Other values are invalid to prevent non-technical personnel from operating incorrectly. After setting a parameter, press the En key to proceed to the next parameter setting.

(2) Sn- Type of instrument input signal.

Note: Input signal selection comparison table (free input is automatically completed internally, no hardware adjustment is required, mA signal does not need to be connected to a resistor). )

(3) dot- Decimal point position, range 0-3. If dot=2, the display format is XX.XX. For temperature signals such as thermistors and thermocouples, the maximum setting is 1, which means the display resolution is 0.1 ℃, and the resolution is automatically converted to 1 ℃ above 1000 degrees.

(4) inPLThe lower limit of the linear input corresponds to the displayed value, which is the lower limit of the instrument range, ranging from -1999 to 9999.

(5) inPHThe upper limit of the linear input corresponds to the displayed value, which is the upper limit of the instrument range, ranging from -1999 to 9999.

(6)J1-HJ1 relay alarm mode. Set to - HH - for high measurement value alarm (upper limit alarm), set to - LL - for low measurement value alarm (lower limit alarm), and set to OFF to prohibit alarm at this point. (Alarm reference "Alarm Description")

(7)Set the alarm parameters for J2, J3, and J4 in sequence

(8) bS- Transmission output modes can be selected from 1-5V, 0-5V, 4-20mA, 0-10mA, and 0-20mA.

(9) bS-LThe instrument measurement display value corresponding to * under the transmission output.

(10) bS-HThe instrument measurement display value corresponding to the * on the transmission output. (See the sixth item "Transmission Output" later)

(11) oSEt- Zero point correction coefficient, displayed value after correction=measured value before correction+oSEt, factory value oSEt=0.0

(12) FSEtThe range of the full-scale correction coefficient is 0.500 to 2.000, and the displayed value after correction is FSEt × (measured value before correction+oSEt). The factory value FSEt is 1.000.

(13)Lb- Digital filtering parameters, set within the range of 0-5. The larger Lb, the more stable the measurement value, but the slower the response. Generally, when the measured values are greatly disturbed, the Lb value can be gradually increased and adjusted to make the fluctuation between the measured values less than 2-5 words. When calibrating instruments in the laboratory, Lb should be set to 0 or 1 to improve response speed.

(14) AddrThe communication address of the instrument ranges from 1 to 99.

(15) bAUdThe baud rate for communication ranges from 1200 to 9600.

(16) LdSWhen the instrument is working, the display values in the lower row are J1HA, J2HA, J3HA, J4HA, Addr, OFF. If this item is set to OFF, there will be no display in the lower row when the instrument is working, and only instruments with display functions can choose this method. If set to Addr, the instrument communication address will be displayed in the lower row when the instrument is working.

Parameter setting is complete, display - End, and the instrument automatically enters the running state.

6、 Alarm

This instrument can be equipped with multiple relays, each of which can be set with ultra-high, ultra-low alarm, and prohibition alarm modes, and adopts alarm hysteresis to avoid frequent relay actions. When a relay is in an alarm state, the corresponding relay's normally open contact is closed and the corresponding indicator light is on. Taking J1 alarm point alarm as an example:

If the alarm mode of this alarm point is set to upper limit alarm (i.e. J1-H is set to - HH -), when the measured value is greater than J1HA, the instrument enters the alarm state. When the measured value drops to J1HA value, the instrument does not stop alarming. Only when the measured value is lower than J1HF, the instrument will release the alarm state. When set as the upper limit alarm, the alarm value J1HA should be greater than the alarm reset value J1HF.

If the alarm mode of this alarm point is set to lower limit alarm (i.e. J1-H is set to - LL -), when the measured value is less than J1HA, the instrument enters the alarm state. When the measured value rises to J1HA, the instrument does not stop alarming. Only when the measured value is higher than J1HF, the instrument will release the alarm state. When set as the lower limit alarm, the alarm value J1HA should be less than the alarm reset value J1HF.

7、 Transmission output

The instrument can convert the measured values into standard signals, and the output form is determined by the "bS" parameter. The range of measured value transmission is determined by the "bS-L" and "bS-H" parameters. If measuring temperature signal PT100, it is required to output 4.0mA at 0 ℃ and 20.0mA at 150 ℃, then bS=4-20, bS-L=0.0, bS-H=150.0. So when the instrument displays 75.0 ℃, it outputs 12.0mA.

8、 Communication instructions

(1)This instrument can be equipped with RS232 and RS485 interfaces for direct communication with a computer. The RS485 standard communication distance is 1.5km, and multiple instruments can be attached. The RS232 standard communication distance is 15m, and only one instrument can be attached. The TXD, RXD, and GND of the RS232 interface are respectively connected to the second, third, and fifth pins of the computer serial port. The data format consists of 1 start bit, 8 data bits, no checksum, and 1 stop bit. To avoid communication conflicts, the instruments are all in listening mode. The computer sends a command to a certain instrument at a specified address, and then waits for a period of time for the instrument to respond. After the instrument receives the correct command, it sends out the data. After sending, the instrument is in listening mode again. In the same system, instrument addresses cannot be the same, and the baud rate must be *.

(2)The instrument adopts the standard Modbus rtu communication protocol. When using the configuration software, the device to be selected is a Modicon (* Kang) PLC, Modbus RTU address type, with function numbers of 3X or 4X, and data of integer 16 bits. The Kingview software register starts from 0001 or 0000 (i.e. 4x001, 4x000), while other configuration software may start from 3x001 or 3x000. The communication is an integer, and users need to handle the decimal places according to the actual situation. Communication transmission data is signed integer data, and it is recommended to define signed integer data for user programming. When the data is greater than 0X8000, the actual negative value is obtained by adding 1 in reverse. For example, if the communication transmission data is 0XFFFF, the corresponding data value is -1. For long integer data such as cumulants, the data value is equal to the high-order x 65536+low order. During configuration, users can also choose the data type as long, and the system will automatically calculate the cumulative amount.Register correspondence table (please refer to the setting section of the operating instructions for specific meanings)

(3)The format of the command for reading data and sending it to the upper computer (it is recommended to read no more than 0X10 or 16 data at a time)

Data format returned by the instrument

Format of data writing and sending commands on the upper computer

Data format returned by the instrument

(4)Except for the measured values, all other data can be written.

Example: Read the PV (PV=1000) value of the instrument with address 1

Send data as 01 03 00 00 00 01 84 0A

In the data transmission, 01 is the instrument address, 03 is the function number, 00 and 00 are the starting addresses of the registers, 00 and 01 represent reading a number, and 84 and 0A are check codes

The returned data is 01 03 02 03 E8 B8 FA (including 03 E8-1000)

In the returned data, 01 is the instrument address, 03 is the function number, 02 is the number of data, 03 is the measured value of E8, and B8 FA is the verification code

If you want to read two data, you can send 01 03 00 00 02 C4 0B

Module with * communication address 248

9、 Warranty

If it is a manufacturing quality problem caused by the factory, the instrument will be repaired free of charge from the date of leaving the factory. If the damage is caused by improper storage and use, the repair cost will be charged. The warranty period is twelve months, and the warranty period of 3-5 years must be specified separately.

10、 Ordering Notice

1. Dimensions of external instruments, opening size, insertion depth
2. Input signal type and display format
3. Output type and output method
4. Communication selection
5. Feed current size and voltage, power supply for sensors
6. Instrument power supply
7. Customized according to customer requirements.