DFRobot
Gravity: Analog Signal Isolator
The Analog Signal Isolator can isolate analog signal and provide isolated power to sensors. It can effectively prevent sensor signal interference and apply ...
The Analog Signal Isolator can isolate analog signal and provide isolated power to sensors. It can effectively prevent sensor signal interference and apply to multi-parameter water quality monitoring sensors. Because usually sensors will be interfered by the other sensors during the measurement, especially those sensors in water quality monitoring system. For example, pH sensor (pH meter) will be affected by the electrical conductivity sensor (EC meter).
The common solution is to isolate the power supply. Once you put them into the same container and share the same power supply, their value won’t be interfered by each other.This analog signal isolator is designed for this situation, it will isolate the analog signal and provide isolated power to the sensors. It has an on-board 5V isolated power IC, and compatible with Gravity-3Pin interface, plug and play, no need for soldering. The transform rate is 1:1, which means analog values in two sides should remain the same.
Gravity: Analog Signal Isolator Interface
Caution:
1.MCU should provide 5.0±0.1V power supply and it decides the finial output precision.
2.The module will consume a large current when it is working, you’d better to use an external power supply.
3.The MAX output current of SEN terminal is 170mA.
4.The GNDs of SEN and MCU are isolated, please DO NOT connect them together.
5.It will be a little warm when it is working.
SPECIFICATION
- Operating Voltage: 5.0V
- Response Time: 4 seconds (Typ)
- Analog Error (both ends): <± 20mV (Typ)
- Interface Type: PH2.0-3P
- No load Current: 75mA
- Dimension: 42 * 32mm / 1.65 * 1.26 inch
-
Non-isolated Terminal (Arduino Side)
Supply Voltage: 5.0 ± 0.1V
Analog Output: 0 ~ 5.0V -
Isolated Terminal (Sensor Side)
Output Voltage: 5.0 ± 0.2V
Analog Input: 0 ~ 5.0V
DOCUMENTS
Jargon buster
Plain-language definitions for the technical terms used above.
- Analog signal isolator
- A circuit module that passes an analog reading while electrically separating the sensor side from the microcontroller side. This can matter in water monitoring because probes in the same liquid can interfere with each other or create ground-loop errors.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
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Analog Signal Isolator Schematic
Schematic · 91.5 KB · Click any page to view full size
Analog Signal Isolator PCB Layout
Mechanical Drawings · 189.1 KB · Click any page to view full size
Supplier page — dfrobot.com
Supplier Description · 691.9 KB · Click any page to view full size
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