1. Features

• Pipeline pressure testing, widely used in major oil and gas fields and other industrial pressure testing fields nationwide;
• Explosion-proof, fully sealed waterproof design;
• Signal synchronous output 4～20mA, RS485, optional on-site;
• Adjustable installation direction: The direction can be adjusted by connecting to the on-site pipeline valve via a union or adapter.

2. Technical Specifications

• Operating environment: Temperature, －40℃≤Tamb≤＋65℃; Atmospheric pressure: 80KPa～110kPa; Humidity: 5%RH～95%RH
• Power supply: 24VDC
• Measurement principle: Piezoresistive
• Output signal: 4～20mA & RS485 optional; 4 1/2 digit LCD display.
• Housing material: Cast aluminum, protection level: IP67
• Contact medium material: 316L
• Electrical connection: NPT1/2″(F)、M20*1.5
• Process connection: NPT1/2″(M) 、 R1/2″(M) 、M20*1.5(M) , Adapter: NPT(F) 1/2″-R1/2″(M)
• Range: 0～ 0.16、0.4、0.6、1.0 、1.6、2.5、4、6、10、16、25、40、60MPa, etc. (Customizable), Accuracy grade: 0.5.
• Dimensions: Height 165 × Width 106 × Depth 130; Weight: 1kg
• Explosion-proof certification: Explosion-proof certificate number: CE18.1519 Explosion-proof mark: EXd IIC T6 Gb

3. Dimensional Drawing

3. Installation and Debugging Instructions and Wiring Definition

3.1. All transmitters have undergone digital calibration, and different transmitters have complete consistency and interchangeability;

3.2. For on-site installation of pressure transmitters, open the meter head cover, connect the cable to the electrical interface, and connect the wires correctly according to the wiring definition. After wiring is complete, tighten the rear cover to ensure waterproofing.

3.3. For pipeline installation of pressure transmitters, first close the corresponding valve, then there are two installation methods: (1). Screw the transmitter directly into the valve port; (2) Screw the union or adapter into the valve port, then screw the transmitter into the union or adapter port. This method increases the adjustability of the direction with the union or adapter. After installation, open the needle valve to confirm that there is no leakage, indicating successful installation;

3.4.   8 Core wiring green terminal definition. (1) 1, 5 pins - 24V power supply +, 2, 6 pins - 0V power supply -, 3, 7 pins - 485_A, 4, 8 pins - 485_B.

For on-site 485 communication, pins 1234 need to be connected, 1-2 for power supply, 3-4 for communication A-B.

For on-site 4-20mA communication, only pins 1-2 need to be connected.

(2) The main signal is a two-wire 4-20mA, RS485 interface. Note that when using RS485 and 4-20mA simultaneously, the number of digital communication networks cannot exceed 10. The RS485 interface cannot add a termination resistor, otherwise it will cause the 4-20mA current to jump, damaging the 4-20mA current signal. If only the RS485 signal is used, there is no limit to the number of parallel connections, and up to 255 units can be connected in parallel.

     Note:

     1. Currently available passive RS485 converters have limited drive capability, so when the number of parallel connections is large, please select an active isolated RS485 interface.

     2. Due to the parallel connection, the board does not have a bus matching resistor and no pull-up/pull-down resistors on the RS485 bus. If the customer's RS485 interface also does not have pull-up/pull-down resistors, it may cause the bus static level to be uncertain, and errors may occur on the RS485 bus. Therefore, customers or system integrators should add matching resistors and pull-up/pull-down resistors to the bus to set the bus static state.

3.5 Display Panel Indication Definition

3.6 On-site Setting of Instrument Communication Basic Information

   Instrument The protocol is also built-in. Supports MODBUS_RTU protocol. The software uses green, self-extracting technology. When used, it will automatically decompress the required dynamic link libraries, so please set this software as a whitelist in your computer's antivirus software to prevent the security software from preventing the normal operation of this software.

     The software supports serial ports 1-15. If using a USB-to-serial port converter, please change the port number to within 1-15.

In addition, after testing, the most commonly used is the USB/RS485 converter. The USB conversion chips used in it are numerous. It has been found that the converter using the FDT232 chip needs to set the driver, otherwise the software will not be able to read the data from the transmitter. The setting page is as follows:
FDT232 Advanced settings of the software driver. Open it in the device manager, you can see a BM option. This setting should be changed to 1. The software usually defaults to 15, so this setting must be modified to use the serial port normally. Other USB converters with different chips have not found this problem.

1. Find Port:

     The software will automatically search for available ports on the computer when it starts. Please select the correct port number, select the baud rate that matches the transmitter, and click the search button to search for online transmitters. The software has a search result prompt at the bottom. Lists all available port numbers on this computer. If there are dynamically plugged and unplugged USB virtual ports, you can click "Find Serial Port" to update the listed information.

     2. "Search Transmitter:"

     This is to search for online transmitters. The search address range is 1-255. A prompt will appear in the status bar when found. To end the search early, click again. Note the selection of the baud rate range. The search only targets the currently set baud rate range.

     3. "Read All:"

     After the search stops, the software will automatically read all parameters of the first transmitter and continuously read the alarm status bit, real-time measured value, instrument status, and ADC value. Clicking the "Read All" button will also update the current data.

     4. "Write All:"

     After all data modifications are complete, click "Write All" to save to the transmitter.

     Note: The cyan text boxes on the software allow customers to modify the content, while the red boxes represent the default data of the transmitter.

Supplementary explanation:

     The software, according to the protocol provided by the customer, has been represented using a separate address representation method. The data type after the data box indicates the type of this data.

DEC represents decimal data. HEX represents hexadecimal data, and characters represent text characters, which are ASCII codes. For detailed protocol and data meaning, please refer to the protocol text provided by the customer.  

3.7 Panel button configuration

     This circuit has three buttons and an LCD display window:

7.1 Panel buttons:

M The main function of the key is the mode key, which switches between data and menu. When the transmitter is not in the setting mode, long pressing the mode button will perform the main variable zeroing function. Whether to execute needs to be selected through the S and Z keys.

S The main function of the key is data addition. In non-setting mode, long pressing the S key will enter the active transmitter upper limit setting mode. At this time, pay attention to the meaningful pressure.

Z The main function of the key is data shift and subtraction. In non-setting mode, long pressing the Z key will enter the active zero point setting mode.

     In measurement mode, clicking the M key will enter the password setting mode, and a password needs to be set to enter the setting mode. If the password is incorrect, the transmitter will exit to the measurement mode.

     The circuit board has active range migration scaling and passive range migration scaling functions. Passive setting requires the user to enter the configuration setting mode.

     The following conventions are used for button states:

S Single click of the key is referred to as: S Z key single click is: S M key single press is: M

M Long press is ML

S Long press is: SL Z key long press is ZL

7.2 The following is the passive configuration panel button setting process ：

     Panel layout diagram:

Setting menu flowchart:

In the END menu, press the M key to exit the setting mode and save the data. In other menus, long pressing the M key will exit the setting mode, but will not save the data.

     There are two OUT menus in the figure, one is the FIX menu and the other is output linearization.

The corresponding menu data meanings in the above setting menu:

2. Active migration and main variable zeroing

     To enter the active migration and main variable zeroing state, it must be in normal working mode.

     When setting active migration, ensure that the pressure is valid. Otherwise, the transmitter's output will be abnormal.

   Main variable zeroing has range limitations. General values need to be around the value 0 or near the zero pressure, with a limit range of 10%. Exceeding this range will not perform the zeroing operation.

3. Switch display

a、 The main screen and auxiliary screen display areas of the screen have multiple display functions. The main screen displays pressure value, percentage, and current displays.

b、The auxiliary screen has two options: temperature display and slave address display. The temperature value comes from the temperature sensor on the circuit board.

The display can be switched at any time. The display mode after each power-on depends on the mode value saved last time by the software. The display mode set on the panel buttons will be cleared after the next power failure.

     The upper right corner of the LCD screen has a battery power display function. The battery power has a total of 5 progress bars. The more bars, the more sufficient the battery power. When the battery voltage is below 3.0V, the battery will automatically cut off the output.

     This transmitter uses a dual power supply system. In addition to normal power supply, there is also a built-in battery power supply mode. By turning on the transmitter's battery power supply with the SW switch, the transmitter will operate in battery power supply mode. For example, when the built-in battery capacity is 2000mA/h, the longest working time of this machine's battery power supply can reach 300 hours, which is about 12.5 days. Whether it is a built-in battery or not, if the external power supply is connected, the instrument will automatically prioritize the use of the external power supply and output a 4-20mA current signal.