1、 Overview
This instrument is based on a microprocessor, fully functional, has communication capabilities, and can be used in conjunction with various flow transmitters and sensors. The XSJ-300 model does not have temperature and pressure compensation function, while the XSJ-600 model has temperature and pressure compensation function.
The LCD display adopts a dot matrix LCD screen (128 x 64), which makes the Chinese display interface more convenient; Due to careful reliability design, the instrument has good electromagnetic compatibility and reliability.
The instrument can perform accurate online calculations on the following fluids
Steam, general gas, natural gas, liquid
2、 Functional Features
Can accept the following types of input signals
(1) Measure the flow input signal
Analog flow signal (AI1): Differential pressure or linear flow signal (4-20mA. DC, 0-10mA. DC, or 0-20mA) DC）
Frequency flow signal (f): 1-10000Hz
(2) Measure pressure/density input signal (AI2)
Pressure or density transmitter analog signal (4-20mA. DC, 0-10mA. DC, or 0-20mA) DC）
(3) Measure temperature input signal
Thermal resistance Pt100 or K, E, T indexing thermocouple signal
Temperature transmitter analog signal (AI3): (4-20mA. DC, 0-10mA. DC or 0-20mA DC）
The input signals for flow, temperature, or pressure can all be 0-5V DC or 1-5V DC， Please specify when placing an order
● Can provide transmitter+24V DC,+12V. DC power supply (with short-circuit protection function) can provide upper and lower limit alarm functions for cumulative quantity, instantaneous quantity, temperature, pressure, etc. to simplify the system and save investment, as well as cumulative quantity pulse output function
● Simple fault-tolerant function: When temperature, pressure/density compensation measurement signals are abnormal, use the corresponding manual set values for compensation calculation
The instrument clock and paperless recording function bring convenience to measurement management
Rich self diagnostic functions make the instrument easier to use and maintain
Password setting can prevent unauthorized personnel from changing the set data
There are no adjustable devices such as potentiometers or toggle switches inside the instrument, thereby improving its vibration resistance, stability, and reliability
The specially designed WDT circuit and power on reset circuit ensure the normal operation of the instrument when powered on, using reliable ferroelectric data storage to prevent data loss when powered off, with a protection time of 10 years
In addition to conventional temperature compensation, pressure compensation, density compensation, and temperature pressure compensation, this table can also be used for:
Compensate for the 'compressibility coefficient' (Z) of general gases
Compensate for the 'over compression coefficient' (Fpv) of natural gas
Compensation for non-linear flow coefficient and upper and lower limits of protocol flow
Compensate for the expansion coefficient of the flow beam in the differential pressure flowmeter
Especially in terms of steam flow measurement and wet gas flow measurement, this table is very comprehensive
Using configuration mode, a flow integrator has all the above functions. For users, this table can be used to solve various flow measurement problems without knowing the operating parameters or sensor parameters
3、 Main technical indicators
● Measure input signal
(1) Measure the flow input signal
Simulated Traffic Signal (AI1)
4～20mA . DC, 0-10mA. DC or 0-20mA DC， Keyboard setting selection
Provide+24V DC external power supply, used for two-wire 4-20mA DC transmitter power supply, load capacity of 30mA, with overcurrent protection
Frequency flow signal (f)
Waveform: rectangular, sine, triangular waveform
Amplitude: Low level 0-2V, high level 5-24V (can be customized according to user requirements)
Frequency: 1-10000Hz
Input resistance: 5K Ω
Provide+24V DC and 12V DC independent external power supply, used for supplying power to frequency flow transmitters. The frequency flow signal input is isolated from the host, and one of the two is chosen to ensure a load capacity of 100mA with overcurrent protection
(2) Measure pressure/density input signal (AI2)
4～20mA . DC, 0-10mA. DC or 0-20mA DC， Keyboard setting selection
Provide+24V DC external power supply, used for two-wire 4-20mA DC transmitter power supply, load capacity of 30mA, with overcurrent protection
(3) Measure temperature input signal (-200-560 ℃)
Thermal resistance; Pt100 divided three wire input, single wire resistance ≤ 10 Ω
Thermocouples: K, E, T divisions, etc
Analog temperature signal (AI3): 4-20mA. DC, 0-10mA. DC, or 0-20mA DC， Keyboard setting selection
Provide+24V DC external power supply, used for two-wire 4-20mA DC transmitter power supply, load capacity of 30mA, with overcurrent protection
● Analog transmission output signal
4～20mA . DC, 0-10mA. DC or 0-20mA DC， Keyboard setting selection
You can choose to transmit and output signals such as flow rate, pressure, or temperature
Load resistance: 0-500 Ω (4-20mA. DC or 0-20mA DC）
0-1000Ω（0～10mA .DC）
Data update cycle: ≤ 0.3S
● Alarm relay contact capacity: AC 220V 3A or DC 24V 5A (resistive load)
● Basic error
Frequency signal input: 0.1% of reading
Resistance thermocouple input: ± 0.3 ℃ (when t ≤ 300 ℃)
0.1% of the reading (when t>300 ℃)
Voltage and current input: ± 0.1% of full range
Current output: ± 0.2% of full scale
Compensated flow display; ± 0.2% of full range
Compensation scope
Steam: pressure 0.1-22MPa abs
Temperature: 0-374 ℃ (saturated steam) 100-560 ℃ (superheated steam)
General gas: arbitrary pressure
Temperature:- 200-560 ℃
Natural gas: pressure 0-14MPa G
Temperature:- 40-115 ℃
Density: 0.554-0.750 kg/m
N2 and CO2 content (%) 0-15%
Liquid: Temperature -200-560 ℃
● Communication interface: EIA RS-485 serial interface (optoelectronic isolation), safe lightning protection circuit design
EIA RS-232 serial interface (optoelectronic isolation)
It can have two serial interfaces at the same time, and can be selected as RS-485 or RS-232 at will. (Please specify when placing an order)
Communication speed: optional (19200, 9600, 4800, 1200 baud rates)
Transmission medium; Twisted pair cable
Power outage data protection time: 10 years
● AC power supply: 220V+10% -15%, 50Hz ± 5% Power consumption: less than 8W
DC power supply: 24V+10% -15% Power consumption: less than 8W
4、 Selection List
