HARTSmart boardKey operation instructions

• Zero point and range migration

Zero point migration: Press the S key and Z key (S key on the left and Z key on the right) simultaneously for 6 seconds, and the display screen will show "Hart", indicating that the zero point and range adjustment status has been activated at this time; Press the Z key again for 5 seconds, and the "Hart" character on the display screen will disappear. The zero point migration will be successful and the activation state will be exited.

Range migration: Press the S and Z keys (S on the left and Z on the right) simultaneously for 6 seconds, and the display screen will show "Hart", indicating that the zero and range adjustment states have been activated; After confirming that the pressure of the device at this time is the range pressure, press the S key for 6 seconds. At this time, the "Hart" character on the display screen disappears, the range migration is successful, and the activation state is exited.

Note: After entering the active state, if you do not want to make adjustments, you can press the S and Z keys simultaneously. After releasing the keys, the "Hart" character on the display screen disappears, indicating that you have exited the active state. Alternatively, it can be powered on again.

• Parameter Settings

2.1 Key Description: Pressing the S key and Z key simultaneously is the exit key; The exit key is only effective when the key is released. Pressing the Z key for 4 seconds is the shift key.

2.2 Parameter Description

After pressing the S key for 6 seconds, the display screen will show "PASS". Press the Z key again, the display screen will show the value and the cursor will flash. The flashing bit is the modification bit. Press the Z key to add 1 to the number in that bit but do not carry it. Press and hold the Z key for 4 seconds to shift the cursor. Modify this value to 160 according to the above operation method, and then press the S key to enter the next parameter adjustment program. The meanings of each parameter are as follows:

Parameter prompt	Numerical value	significance
	XXXXX	Password verification, password is 160
	XXXX. X	Process quantity corresponding to 20mA (full-scale value)
	XXXX. X	Process quantity corresponding to 4mA (zero point value)
	XXXXX	Transmission function,=0 represents linearity,=1 represents square root
	XXXXX	Display units: 1=inH2O (header not displayed), 2=mHg (header not displayed), 3=ftH2O (header not displayed), 4=mm, 5=mmHg (header not displayed), 6=Psi, 7=bar, 8=mbar (header not displayed), 9=KPa (header not displayed), 10=KPa (header not displayed), 11=Pa, 12=Kpa, 13=KPa (header not displayed), 14=KPa (header not displayed), 15=MPa, 16=mA, 17=%, 18=℃, 19=S, 20=m3/h, 21=t/h
	XXXX. X	Damping time, with a maximum limit of 30 seconds during program execution
	XXXXX	Low point adjustment. Adjust the process quantity to the current input value. Press the Z key to modify the low point fine adjustment pressure value; Do not press the Z key when making no adjustments, press the S key directly to enter the next parameter.
	XXXXX	Fine tune the high point. Adjust the process quantity to the current input value. Press the Z key to modify the low point fine adjustment pressure value; Do not press the Z key when making no adjustments, press the S key directly to enter the next parameter.
	yES/no	Hart three-point linearization and fine-tuning data initialization

Shortcut key: Press the Z key for 6 seconds to obtain the zero adjustment command.

If the on-site data is scrambled by the user. After turning off the power, press and hold the "S" key to power it back on. Once the startup is complete, release the "S" key. Can restore manufacturer settings.

HARTMulti functional circleBoard usage instructions

Our company's HART multifunctional circular plate can be used with various sensors, such as capacitive film pressure sensors, diffused silicon pressure sensors, and ceramic capacitive pressure sensors. Integrated high-precision 5-digit digital LCD display with backlight, * following the HART fieldbus protocol. Multi point linear correction and precise digital temperature compensation. The two buttons on the panel not only allow for zero and range migration, but also add parameter setting functions. When there is no communicator on site, the device can still be adjusted. The transmitter manufactured using this circuit board can be linearized using only the HART three-point linearization command and sensor fine-tuning command during user maintenance to meet usage requirements.

Figure (1) Main board+signal conditioning small board

• Hardware usage instructions

1. Power supply：12~36VDC， The HART Foundation has the following requirements for the power supply of HART devices:

Figure (2)HARTPower parameters of the circuit

2. High load resistance: RL=(VS–12V)/0.023A

Where:RL——High load resistance, unit: Ω; During communication,RLFor:200Ω~1000Ω)

VS——Power supply voltage, unit:V

3. Working temperature range:-40~+85℃

4. Start time：<3 seconds

5. Damping：032 seconds

6. Output signal: Two line system 4~Overlay on 20mA DC signalFSK(Shift frequency keying) digital signal (andHARTCompatible). Users can choose between linear output or square root output.

7. Wiring method：

• Wiring method of capacitive film box pressure sensor

When using a capacitive film box type pressure sensor, the entire circuit is composed of a HART multifunctional motherboard and a signal conditioning module

Board composition. The sensor output line is connected to the signal conditioning board, which is installed in the reserved cavity of the sensor.

There is already a temperature sensing diode soldered on the small board. If the sensor has a built-in temperature sensing diode and the output line is connected to the temperature sensing diode on the small board

Please remove this diode when the+- poles of the diode are connected. The power input terminal on the motherboard has integrated an LC π - shaped filter, which has been modified

Filters do not need to be installed inside the terminal box of the transmitter. The wiring terminals are shown in Figure (2):

Figure (2)

2)Wiring method of diffusion silicon pressure sensor

When using a diffused silicon pressure sensor, only the HART multifunctional motherboard is used for the entire circuit. Sensor connection

Connect the wire to the corresponding pad J2 on the motherboard according to the sensor output terminal name. Constant current source power supply, JP1 and JP6 are short circuited, and the rest are open circuited. Connect according to J2 instructions. The wiring terminals are shown in Figure (3):

The sensor ground shielding wire is connected to the copper pillar of the motherboard housing. The connection end between the sensor and the motherboard integrates an LC filter, effectively blocking interference signals introduced by the sensor. At the same time, the power input terminal on the motherboard is also integrated with LC π - shaped

Figure (3)

Filter to block interference signals introduced by power lines.

Little tip:When using a gauge pressure sensor to make a 0~- XX Kpa vacuum transmitter, swap the OUT+and OUT - wires and do more

A few linearization points (because the sensor manufacturer only linearizes in the forward direction, the linearization is poor in the reverse direction, but more linearization points can be achieved)

To meet the requirements of high precision.

3)Wiring method of ceramic capacitive pressure sensor

When using ceramic capacitive pressure sensors, only the HART multifunctional motherboard is used for the entire circuit. JP1 and JP5 are short circuited. If a high constant voltage is required, they can be directly connected to a 3V constant voltage. The rest are open. Connect the wiring according to J2 instructions, short-circuit the OUT - and IN - on the motherboard, and connect the COM (IN -) lead of the sensor.

2、 Communication connection method

This product * follows the HART communication specification and communicates with on-site devices through upper computer communication software and handheld communicator. The upper computer software supports WIN9X/ME, WIN2000, XP, and supports USB-RS232 converters; When using the upper computer software, it is necessary to use HARTMODEM. The handheld communicator uses two No. 5 high-energy alkaline batteries and can work continuously3More than ten days (when there is no LCD backlight). The specific wiring is shown in the following figure, including HART_MODEMThe two signal terminals of the handheld communicator can also be connected to both ends of a 250 Ω resistor.

• Installation and use of upper computer software

3-1. Software Installation

Open the software package and run SETUP within it.EXEThe software will automatically install to:\\\\Programe\\Hart3351\\Hart3351under the directoryDuring the installation process, if prompted to enter the serial number, please enter any number. After installation, run H in the above directoryart3351.exeJust follow the prompts to apply for a running password. This software supports USB to RS232 converters on WIN9X/ME, WIN2000, and laptops. When the software needs to be upgraded for other reasons, simply update the new version of Hart3351.exeCovering the original Hart3351.exeJust enough.

3-2. Serial port settings

Double click Hart3351.exeFile, the running interface shown in Figure (6) appears, according to your PC and HART_MODEMFor the connection status, click on the serial port number in the "Serial Port Selection" selection box. If the device is connected normally, the commonly used buttons in the interface will change from gray to black and the corresponding parameter values will appear. Otherwise, it will indicate "Instrument not responding!", as shown in Figure (7).Note: In future software versions, the interface may differ, but the functionality and usage methods will remain the same.

When the message 'Instrument not responding!' appears, please check if the instrument wiring is normal and if the circuit current is normal. If the above situation is normal, press the "Cancel" button to close the dialog box as shown in Figure (7), and then click the "Short Frame Address" button to open the dialog box(Click the "Short Frame Address Search" button in Figure 8), and the program will automatically search for on-site devices with short frame addresses ranging from 0 to 15. After searching, click the "Return" button. When this software starts running, it uses the default short frame address 0. If the short frame address of the on-site device is not 0, please follow the above steps.

Due to the lack of RS232 port on the laptop, a USB to RS232 converter needs to be purchased separately. After connecting the converter, please install the driver program on the CD that comes with the converter, and then find the serial port number of the converter.The search method is briefly described as follows: right-click on the desktop“My Computer”Icon, click in the menu“attribute”In the appearance“System Properties”Select in the settings dialog box“Equipment Management”Tabs (for WIN2000)“Hardware Device Manager”Double click on the installed converter device in the dialog box that appears, and then search for the device used in the dialog box that appearscom口。Run Hart3351.exeAfter the file, click on the corresponding serial port number in the "Serial Port Selection" selection box.

3-11. Production operation process:

current calibrationtoMulti-point linearizationto temperature compensationtoChange the range, damping, display unit, etc. as neededtobackuptoend

Data initialization

When making a new board, this step can be skipped. If the circuit board has already been calibrated in conjunction with the sensor, data initialization can be used to clear the data and perform a new calibration.Enter 5567 in the "Enter Password" value box and click the "Unlock" button; Then click the "Data Initialization" button, and the "Sensor Working Mode" dialog box will appear. After selecting the corresponding working mode and sensor code (as shown in Figure 11), the "Download" button changes from gray to black entity. Click the "Download" button and wait for the "Data is being downloaded" box to display in the "Information" box. Please wait…”After the information disappears, click the "Next" button and follow the prompts to proceed.Attention: During this operation, if the program deadlocks and the dialog box cannot be closed, please press the "Ctrl+Alt+Del" key to end the currently running program in the "Close Program" dialog box that appears.

3-6. Multi point linearization

Click the "Multi point Linearization" button, select the appropriate number in the "Sensor Working Mode" dialog box, and then click the "Download" button (as shown in Figure 11). After downloading, click "Next" to bring up the dialog box shown in Figure (12). If the dialog box covers the "AD value" value box of the original dialog box, please move the mouse to the top of the "multi-point linearization" dialog box, hold down the left mouse button, move the dialog box to the appropriate position, release the left mouse button, and then fill in the actual measurement value according to the content of the dialog box. After completing all measurement points, click the "Download" button. After downloading, click the 'Return' button. If there is some deviation between the displayed pressure and the standard source, it may be due to the zero point tracking function being in operation Just click again click”Read parameters”Read the parameters for downloading

Tip: Multi point linearization data can be added to the dialog box by pressing the AD value button, and returned after downloading.

Figure (12)

current calibration

Click the "Current Calibration" button, and the "4mA Current Calibration" dialog box as shown in Figure (13) will appear. At this time, compare with the standard ammeter, enter the current value shown on the ammeter, fill in the mA space as shown in the figure, click the "DA Adjustment" button, and the ammeter should display 4mA. If it is not adjusted properly, you can enter the actual current value of the ammeter again and adjust it once. After completion, click "Next" to enter the 20mA adjustment interface, as shown in Figure (14). Follow the 4mA calibration method to adjust the current to the correct position.

Figure (13)

Figure 14

3-7. Temperature compensation

Click the "Temperature Compensation" button, and a dialog box as shown in Figure (13) will appear. At room temperature, first download the temperature compensation data to the circuit board. Place the cursor in the corresponding box of the room temperature line and click to take the "AD value". In the "Pressure Full" box, after filling up the range pressure, click to take the "AD value". If pressure full compensation is not performed, fill in 65525 in the "Pressure Full" box. After filling in as shown in Figure (13), click the download button for this line. Download the temperature compensation data at room temperature to the circuit board. Similarly, the pressure compensation data for low and high temperatures can also be downloaded as described above. When there is pressure compensation data for high temperature, it will automatically compensate after downloading and check the compensation effect click”Read parameters”Read the parameters for downloading

thirteen

Performance parameter settings

The "Performance Parameters" dialog box is mainly used to set damping time, output type, and unit. Click the 'Download' button to proceed. After being set correctly, the small signal cutoff function refers to the 4mAThe current value of the upper and lower cuts Cut off the numerical value as a percentage of the range Click Read, enter the cut ratio to download

data backup

Enter in the password box”5567”, then”data backup”The button turns black and becomes available Click to bring up the dialog box as shown in the figure, then click 'Yes'. If the on-site data is scrambled by the user. After turning off the power, press and hold the "S" key to power it back on. Once the startup is complete, release the "S" key. Can restore manufacturer settings.

3-3、 HART three-point linearization (not required for manufacturer calibration)

Click the "Instrument Characterization" button, a dialog box as shown in Figure (9) will appear, and then follow the prompts step by step to operate.

Attention: Please follow the prompts to apply the appropriate pressure to the transmitter, otherwise the device will not function properly and may need to be re initialized with data.

3-4. Sensor fine-tuning (not required for manufacturer calibration)

Click the "Sensor Fine Adjustment" button, a dialog box as shown in Figure (10) will appear, and then follow the prompts step by step to operate.

3-8. Three point linearization and fine-tuning data initialization (not required for manufacturer calibration)

Enter 8888 in the "Enter Password" value box and click the "Unlock" button; At this point, press the 'User Data Reset' button

Button activation. Click the "Yes" button in the dialog box that appears, and the HART three-point linearization and fine-tuning data will be reset.

Figure (20)

3-7Sensor type and amplifier gain settings

Click the "Multi point Linearization" button, select the working mode option in the displayed sensor working mode dialog box (as shown in the figure below), and click on the corresponding sensor type. Click on the sensor code option and select the appropriate sensor code. For capacitive film pressure sensors, codes from 0 to 9 represent different working ranges; At this time, other sensors should select the corresponding gain. When selecting "default gain", the gain will be set according to the program default value. Users only need to select the 'default gain', and can choose the appropriate gain value for special applications.

Figure 18 and Figure 19

HARTSmart boardthreeKey operation instructions

• Zero point and range migration

Zero point migration: Press the S key and Z key (S key on the left and Z key on the right) simultaneously for 6 seconds, and the display screen will show "Hart", indicating that the zero point and range adjustment status has been activated at this time; Press the Z key again for 5 seconds, and the "Hart" character on the display screen will disappear. The zero point migration will be successful and the activation state will be exited.

Range migration: Press the S and Z keys (S on the left and Z on the right) simultaneously for 6 seconds, and the display screen will show "Hart", indicating that the zero and range adjustment states have been activated; After confirming that the pressure of the device at this time is the range pressure, press the S key for 6 seconds. At this time, the "Hart" character on the display screen disappears, the range migration is successful, and the activation state is exited.

Note: After entering the active state, if you do not want to make adjustments, you can press the S and Z keys simultaneously. After releasing the keys, the "Hart" character on the display screen disappears, indicating that you have exited the active state. Alternatively, it can be powered on again.

• Parameter Settings

2.1 Key Description: The M key is the menu key; Press the S key to shift, and press the Z key to add 1 to the current digit; Simultaneously press the S key and Z key to exit; The exit key is only effective when the key is released.

2.2 Parameter Description: Press the M key for 4 seconds to enter the password entrance of the secondary menu. The display screen will show "PASS". Press the Z key again, and the display screen will show the value 168 with the cursor flashing. The flashing bit is the modification bit. Press the Z key to add 1 to the number in that bit but do not carry it. Press the S key to shift. Modify this value to 160 according to the above operation method, and then press the M key to enter the next parameter adjustment program. The meanings of each parameter are as follows:

Parameter prompt	Numerical value	significance
	XXXXX	Password verification, password is 160
	XXXX. X	Process quantity corresponding to 20mA (full-scale value)
	XXXX. X	Process quantity corresponding to 4mA (zero point value)
	XXXXX	Transmission function,=0 represents linearity,=1 represents square root
	XXXXX	Display units: 1=inH2O, 2=mHg, 3=ftH2O, 4=mm, 5=mmHg, 6=Psi, 7=bar, 8=mbar, 9=g/cm2，10= kg/cm2，11=Pa，12=Kpa，13=torr，14=rtm， 15=MPa，16=mA，17=％，18=℃，19=S，20=m3/h
	XXXX. X	Damping time, with a maximum limit of 30 seconds during program execution
	XXXXX	Low point adjustment. Adjust the process quantity to the current input value. Press the Z key to modify the low point fine adjustment pressure value; Do not press the Z key when making no adjustments, press the M key directly to enter the next parameter.
	XXXXX	Fine tune the high point. Adjust the process quantity to the current input value. Press the Z key to modify the low point fine adjustment pressure value; Do not press the Z key when making no adjustments, press the M key directly to enter the next parameter.
	yES/no	Hart three-point linearization and fine-tuning data initialization
		K value. When used as a flow unit, the displayed value on the LCD screen can correspond to the required value for full-scale display of the measurement range.
		Data recovery. When the value is 0, it is not tracked, and when the value is 1, zero point tracking takes effect

Shortcut key: Press the Z key for 6 seconds to obtain the zero adjustment command.

If there is data misoperation and disorder on site. After turning off the power, press and hold the "S" key to power it back on. Once the startup is complete, release the "S" key. Can restore manufacturer settings.