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INTRODUCTION
MEWOI3800 non-contact grounding resistance online tester is specially designed and manufactured for online monitoring of the connection status of grounding down conductors, loop grounding resistance, and metal loop connection resistance. On-line test, non-contact measurement, grounding wire through the heart, no need for self-test, real-time detection. Provide RS485 (support MODBUS-RTU communication protocol). The detector is composed of sensors and circuit board modules, which is suitable for secondary development and integration by users. It is suitable for grounding of transmission line towers; underground mine equipment grounding; meteorological lightning protection grounding; petrochemical grounding; communication grounding; substation grounding; railway facilities grounding; building warehouse grounding; It can also be used for anti-theft monitoring of grounding wires and metal cables.
MEWOI3800X is a split-type large-diameter sensor, which is suitable for 130mm wide flat steel ground wire. It is convenient and quick to install without disconnecting the grounding down-conductor.
MEWOI3800 non-contact grounding resistance online detector can be installed and used individually, or can be used as a wired network system or a wireless network system.
Features
POWER indicator light | Working power indicator, it will be displayed when the power is turned on |
ALARM indicator | Alarm indicator light, flashes when the tested value is greater than the set critical value |
SET key | enter settings |
up and down arrow keys | After pressing the SET key to enter the alarm setting, press the up and down arrow keys to change the size of the number |
ENTER key | After the alarm threshold is set, press ENTER to save |
Technical Parameter
Function | Loop grounding resistance online monitoring, metal loop connection resistance online monitoring, grounding status monitoring; grounding wire, metal cable anti-theft monitoring |
power supply | 6VDC～12VDC, 50mA Max. (external power supply) |
Resistance range | 0.01Ω～10Ω |
Resolution | 0.001Ω |
Accuracy | ±2%rdg±3dgt (20℃±5℃, below 70%RH) |
communication method | RS485 (support MODBUS-RTU communication protocol), optional GPRS communication |
LCD size | 47mm×28.5mm |
PCB size | 75mm×54mm×22mm |
sensor size | 245mm×115mm×56mm |
Sensor caliber | 130mm×20mm |
sensor quality | About 1762g; total mass: about 1950g (including accessories) |
PCB interface | J1: signal output, power input interface J2: Sensor and PCB connection port |
J1 logo | P+: power input positive P-: power input ground GND: signal ground, short circuit with power input ground (P-) R+: signal output positive R-: signal output negative |
J2 logo | I+, I- current coil interface U+, U- voltage coil interface GND: common ground |
cable | 1 piece, 0.5m long (5 cores) |
signal line | 1 piece, 1 meter long (5 cores) |
Connecting line identification | Red --- power input is positive; Black --- power input ground; (power input ground and shield ground can be short-circuited) Green --- RS485 signal is positive; Yellow-green --- RS485 signal negative; White --- shielding ground; |
Working temperature and humidity | -20℃～55℃；20％RH～90％RH |
overflow indication | When the displayed value is greater than 100Ω, the communication sends the "OLΩ" command |
shift gear | fully automatic shift |
Ground interference current | should be avoided |
external magnetic field | ＜40A/m |
external electric field | ＜1V/m |
single measurement time | about 0.5 seconds |
Working current | 50mA Max. |
Install | The ground wire passes through the center hole of the sensor |
installation requirements | The circuit board needs to be placed in another protective box |
Network Structure
Wired Network System (Self -Development Software)
Wired network system through RS485 communication protocol to transmit data, build up by the detector, 【communicator, monitoring software, power adapter, computer (above equipment need the user provide and secondary development) 】and so on, suitable for short-distance 1500 meters grounding resistance monitoring.
Wireless Network System (Self -Development Software)
Wireless network system through GPRS communication protocol to transmit data ,build up by the detector(built-in GPRS transceiver module), 【SIM communication card, monitoring software, power adapter, computer(above equipment need the user provide and secondary development)】 and other components for long-distance ground resistance monitoring., distance is not limited.
