Location：
Equipped with RS485 (support MODBUS-RTU communication protocol) optional GPRS communication
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Product nickname
Loop grounding resistance online monitoring, metal loop connection resistance online monitoring, grounding status monitoring; grounding wire, metal cable anti-theft monitoring.
Product 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.
MEWOI3800E is a small-diameter sensor with small size and light weight, suitable for installation in places with limited space. It can be installed and used individually, or it can be used as a wired network system or a wireless network system.
MAIN 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 |
Product Number
| model | CT structure | Range | Difference description |
| MEWOI3800B | closed loop | 0.010Ω～200Ω | The detector has no display screen and indicator light, and needs to be set up to use the network |
| MEWOI3800C | closed loop | 0.010Ω～200Ω | The detector has its own display screen, alarm setting, sound and light alarm indication |
| MEWOI3800LC | Open and close | 0.010Ω～100Ω | There is no need to disconnect the ground wire for installation. The detector has sound and light alarm indication |
| MEWOI3800LD | Open and close | 0.010Ω～100Ω | There is no need to disconnect the ground wire for installation. The detector has display screen, alarm setting, sound and light alarm indication |
| MEWOI3800E | Closed-loop built-in | 0.010Ω～100Ω | Small caliber, no housing, suitable for secondary development |
| MEWOI3800N | Closed-loop built-in | 0.010Ω～100Ω | Flat diameter, no shell, suitable for secondary development |
| MEWOI3800T | Closed loop external | 0.010Ω～100Ω | 304 stainless steel shell, suitable for secondary development, explosion-proof and anti-collision, waterproof and dustproof, high and low temperature resistance |
| MEWOI3800X | Open and close | 0.010Ω～10Ω | Large diameter, no need to disconnect the ground wire for installation, no casing, suitable for secondary development |
| MEWOI3900 | none | 0.01Ω~2000Ω | Need grounding auxiliary pile, communicate directly with computer, have display screen, alarm setting, sound and light alarm indication |
| MEWOI3900B | none | 0.01Ω~2000Ω | Need grounding auxiliary pile, communicate directly with computer, have display screen, alarm setting, sound and ligh |
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～100Ω |
Resolution | 0.001Ω |
Accuracy | ±2%rdg±3dgt (20℃±5℃, below 70%RH) |
LCD size | 47mm×28.5mm |
PCB size | 75mm×54mm×22mm |
sensor size | 76mm×60mm×38mm |
Sensor caliber | Φ17mm |
sensor quality | About 188g; total mass: about 334g (including accessories) |
overflow indication | When the displayed value is greater than 100Ω, the communication sends the "OLΩ" command |
communication method | RS485 (support MODBUS-RTU communication protocol), optional GPRS communication |
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 |
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 |
