Description
LED Ohm Meter High-Precision Digital Resistance Meter RS485 Resistance Measuring Ohmmeter with Upper and Lower Alarm
Product Description
The digital display resistance meter is an intelligent instrument with functions such as programmable measurement, display, alarm, digital communication and analog quantity transmission and output. High precision and good stability. 4-digit high-brightness red LED display; one or two relay alarm outputs can be selected to realize the alarm function of upper and lower limit, upper limit and lower limit; RS485 digital interface communication is optional, and the international standard MODBUS-RTU communication protocol is adopted. PLC, HMI, configuration software realize networking; optional analog quantity (DC0~20mA, DC4~20mA, DC0~5V, DC1~5V, DC0~10V, etc.) transmission output, input resistance signal and analog output signal isolation , Into a linear relationship.
Specification
item
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value
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Range
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0~1KΩ、0~5KΩ、0~10KΩ、0~20KΩ
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Auxiliary power
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Linear power supply: AC220V±5%; power consumption<3VA default
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Relay output
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One or two outputs, contact capacity: 1A/220VAC; 1A/24VDC
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Analog output
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DC0~20mA, DC4~20mA, DC0~5V, DC1~5V, DC0~10V, etc.
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RS485 communication
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RS485 communication interface, physical layer isolation, in line with the international standard
MODBUS-RTU protocol Communication baud rate 2400~9600, data format N81, E81, O81, N82
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Accuracy class
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0.2 level, 0.5 level
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Display method
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Digital display: 4-digit high-brightness LED digital tube
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Environment
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Working temperature: -10-55℃; Storage temperature: -20-75℃
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Safety
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Insulation: signal, power, output terminal to the shell resistance> 5MΩ
Withstand voltage: signal input, power supply, output between> AC2KV
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Dimensions
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96*48*85mm
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Note: Choose one of analog output and RS485 communication, and the two functions cannot be selected at the same time.
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Installation Instructions
Relay alarm output
Relay contact capacity: 1A/250VAC, 1A/24VDC. The relay works in the upper and lower limit alarm mode, and there are 4 alarm parameter settings: upper limit alarm value UP, lower limit alarm value douu, return difference value noop, alarm delay time value dly (unit: second); upper limit alarm description: when the measured value exceeds the upper limit After the alarm value and the alarm delay value are maintained for the time, the upper limit alarm relay will act. When the upper limit alarm relay is activated, only when the measured value is less than (upper limit alarm value-return difference), the upper limit alarm relay will reset. Lower limit alarm description: When the measured value is lower than the lower limit alarm value and the alarm delay value continues for the time, the lower limit alarm relay will act. When the lower limit alarm relay is activated, only when the measured value is greater than (lower limit alarm value + hysteresis value) When, the lower limit alarm relay is reset. When the relay works in the upper limit alarm or the lower limit alarm mode, both relays are used as the upper limit alarm relay or the lower limit relay, and the action mode is the same as that of the upper limit or the lower limit.
Analog quantity transmission output
Analog quantity transmission output is optional: DC0~20mA, DC4~20mA, DC0~5V, DC1~5V, DC0~10V, etc. The analog quantity transmission output is isolated from the input signal and has a linear corresponding relationship. It is widely used in PLC, DCS and other acquisitions. The accuracy is 0.5 grade; when the current is output, the load resistance is less than 500Ω, and when the voltage is output, the load resistance is more than 100KΩ.
Details Images