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Click to Download:MEWOI3900 Online Earth Resistance Tester User Manual
INTRODUCTION
MEWOI3900C Earth Resistance Online Detector is high-tech product that our company has devoted to "grounding resistance detection technology research" for more than ten years, Using precision 3-wire or simple 2-wire measurement method to test the grounding resistance. Adopt average value rectification method to test grounding voltage, online detection, real-time monitoring. User can select RS232 or RS485 communication, according the protocol MODBUS to secondary development, build network, realize remote multipoint online monitoring etc. MEWOI3900C Earth Resistance Online Detector displayed by super large LCD, very clear and obvious. The alarm critical value can be set via the button, and with the sound and light alarm indication. Ensure the high accuracy, high stability and high reliability of real-time online monitoring of grounding resistance value in various place. MEWOI3900C Earth Resistance Online Detector Tester suitable for transmission line tower grounding, underground mine equipment grounding , weather lightning protection grounding, petrochemical grounding ,communication base station grounding, power substation grounding , railway grounding , building warehouse grounding , electrical equipment grounding, etc. |
MAIN FEATURES
| 1,Using precision 3-wire or simple 2-wire measurement method to test the grounding resistance. Adopt average value rectification method to test grounding voltage, online detection, real-time monitoring. |
| 2,User can select RS485 or GPRS communication, according the protocol MODBUS to secondary development, build network, realize remote multipoint online monitoring etc. |
| 3,With LCD screen, can observe the grounding resistance value at any time. Audible and visible alarm, setting the alarm thresholds. Setting the automatic monitoring record interval time |
| 4,Tester equip with guide rail structure, convenient to installation. |
TECHNICAL SPECIFICATION
Function | On-line monitoring ground resistance, ground voltage, equipotential connection resistance, low resistance. | ||
Power Supply | Standard: 12V±1VDC, 400mA Max. | ||
| Range | Accuracy | Resolution | |
Resistance | 0.01Ω~20Ω | ±2%rdg±3dgt (auxiliary ground resistance 100Ω±5%, voltage to ground<10V) | 0.01Ω |
| 0.1Ω~200Ω | 0.1Ω | ||
| 1Ω~2000Ω | 1Ω | ||
Voltage | 0~600V AC | ±2%rdg±3dgt | 1V |
Measure Mode | Precise 3-wire measurement, simple 2-wire measurement. | ||
Measure Method | Ground resistance: rated current change-pole method, measured current 11mA Max, 128Hz; Voltage to ground: average value rectification method. | ||
Data Mode | Mean. | ||
Display Mode | 4-digital super-large LCD. | ||
Measuring Indicator | During measurement, LCD count down display. | ||
LCD Size | 128mm×75mm; Display field: 124mm×67mm. | ||
Dimension | L×W×H: 130mm×90mm×54mm. | ||
Measure Rate | Voltage to ground: about 2 times/second; ground resistance: about 30 seconds/time. | ||
Measure Times | Over 10000 times(Measuring 10Ω for one time and take a pause for 30s). | ||
Monitoring Interval Time | Setting range of automatic monitoring interval time :1-999 h | ||
Instrument Interface | Pluggable terminal blocks: 9 pin connector. | ||
Communication Method | RS485 or GPRS | ||
Communication Line | USB to RS485 communication line( or optionalUSB to RS232 communication line). | ||
Range Shift | Automatically. | ||
Data Storage | 99 groups, flash display 99 icon to indicate storage is full. | ||
Interval Time | Range of automatic monitoring interval time: 1-999 h. | ||
Data Access | Data read function: READ icon display. | ||
Overflow Display | Exceeding measuring range overflow function: OL icon display. | ||
Alarm | Audible and visible alarm. | ||
Power supply Voltage | When power supply voltage decreases to about 10V, power supply low symbol will display, reminding to replace the power. | ||
Weight | Detector: 380g. | ||
Working Humiture | -10℃~40℃; below 80%rh. | ||
Storage Humiture | - -20℃~60℃; below 70%rh. | ||
Overload Protection | Measurement ground resistance: E-P, E-C between each interfaces AC 280V/3 sec. | ||
Electromagnetism | IEC61010-4-3,Radio frequency electromagnetic field≤1V/m. | ||
| Line Voltage | Measuring the voltage to ground: Below AC 600V | ||
| Accessories | Meter*1,Power and Communication Cable*1,Aluminum Mounting Parts, Manual | ||