Dual channel digital display instrument, liquid level display instrument, temperature gauge

Intelligent dual channel display alarm device, capable of displaying two parameters, with four relay outputs, two transmitter outputs, RS485 communication, and dual channel addition and subtraction operations.

Dual channel digital display instrumentTechnical Specifications

Accuracy of measurement/transmission system: ± 0.2% × F · S

Number display: Four digit display, floating point decimal.

Sampling speed: ≤ 100ms/time

Display resolution: Last 1 word.

Temperature drift:<100ppm

Cold end temperature compensation accuracy: ± 1 ℃ (preheating for 30 minutes)

Allowable lead resistance for measuring thermal resistance: ≤ 30 Ω

Working temperature: Industrial standard -10~+55 ℃

Input impedance: Current: 100 Ω; Voltage: 500 K Ω

Output impedance: 0~550 Ω when outputting 4-20mA; 0-10mA output, 0-1K Ω

Transmission output ripple: ≤ 50mVp-p

Alarm relay contact capacity: AC220V, 1A; DC24V, 2A (resistive load)

Communication interface: RS232 or RS485

Communication protocol: Standard MODBUS-RTU protocol

Communication distance: RS485: Node count ≤ 256 (without relay), distance ≤ 1000 meters (at baud rate 9600)

Distribution output voltage: DC24 ± 1V 50mA, overcurrent automatic protection

Insulation strength (between input/output/communication/power supply): not less than 1500V.AC per minute

Insulation impedance (between power supply/input/output/communication): not less than 100M Ω

Allowable atmospheric pressure at work: 80-106kPa

Allowable relative humidity at work: 10-90% RH (at 40 ℃)

Allowable ambient temperature during storage and transportation: -40-+80 ℃

Power supply: AC: AC220V (allowable range 95-265V)

DC: DC24V (allowable range 16-28V)

Intelligent dual channel display alarm device, capable of displaying two parameters, with four relay outputs, two transmitter outputs, RS485 communication, and dual channel addition and subtraction operations. The dual circuit display controller can perform mathematical operations (addition, subtraction) between two signals, expanding the application field of the instrument.