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Kaifeng Instrument LJS-1000 Flow Computer (Digital flow counter)
The main features of the meter are as follows:
Modular hardware structure and configurable application software, can use pulse, 4 ~ 20mA, RS485, HART, etc. as signal receiving field instrument
The collected data of the watch;
Able to detect on-site flow, temperature, and pressure signals, and perform calculations of working condition flow, standard flow and mass flow;
Has a network interface, can execute the standard modbus TCP / IP protocol, and can also be used as an Internet access port for network data exchange;
Has two USB interfaces for reading data and expanding peripheral devices;
With power failure memory function, it can continue to accumulate the total flow after power is restored.
The main technical parameters
Main processor system configuration
CPU: RAM core processor;
Storage space (ROM) 512M;
Memory (RAM) 512M;
SD card expansion supports up to 64G (the SD card must be inserted when the meter is powered on);
100M adaptive Ethernet port (implement Modbus TCP / IP protocol or TCP / IP protocol);
2 USB2.0 ports, can be connected to HUB for expansion;
1 RS232 interface, can be connected to standard embedded thermal printer;
1 RS485 interface, implementing Modbus protocol (can be customized according to user requirements);
Standard 7-inch color capacitive touch screen with a resolution of 800 × 480;
Slave processor system configuration
CPU: 32-bit Cortex-M3, running frequency is 16MHz;
Program memory is 128K FLSH / EE;
Data memory: 8K SRAM;
Analog input: 6 channels, AD conversion resolution is 24 bits (Σ-Δ), and the minimum sampling rate is 5 times / second;
Pulse input: 2 channels (multiplexed with channel 5 and channel 6);
Switch output: 2 channels;
HART input: 1 channel (multiplexed with channel 1, the inspection instrument does not have this function).
Working parameters
Power supply voltage: 220V / AC (variation range: 160 ~ 245V / AC);
Ambient temperature: 5 ~ 40 ℃;
Measurement error: analog quantity≤0.1%
External power supply (transmitter) power: 24V; ≤200mA;
Dimensions: 210 × 170 × 105;
Installation method: panel mounting; opening size: 152 × 152.
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