- 描述
- 評價 (0)
描述
描述
不少場合,需要電氣隔離,才能保證感測器模組的可靠運行。有些感測器,比如pH感測器與電導率感測器,如果共用一個電源,在同一種容器中測量,就會相互干擾,不能正常工作。為保證感測器模組穩定可靠的運行,需要把信號與電源都隔離起來。
我們推出的這款Arduino相容的類比量隔離模組,能夠隔離類比信號,有效防止感測器之間的相互干擾;板載5V隔離電源,可直接提供給感測器模組使用,無需額外的電源,簡單實用。連線介面專為DFRobot 3Pin模擬感測器設計,隨插即用,無需焊接。模擬量變送比為1:1,因此把該模組串到電路中後,對感測器輸出模擬量的影響非常小,所以主控板上的代碼無需更改,簡單方便。
使用這款類比量隔離模組,可輕鬆解決感測器之間的相互干擾。如用於多合一水質檢測系統,不用擔心水質感測器之間相互干擾。本產品幾乎相容DFRobot所有的模擬輸出型感測器,加上DFRobot具有種類豐富的感測器,因此本產品可用於多種需要隔離的應用場合,滿足您的多種需求。
注意事項:
1.本模組的MCU端(非隔離端),儘量提供5.0±0.1V的精確電壓。輸入電壓精度越高,輸出模擬量精度越高。
2.本模組工作時消耗電流較大,因此建議Arduino主控板外接電源,以提供足夠的電源功率,也能保證電源電壓精度,不至於電源電壓明顯降低。
3.SEN端(隔離端)最大輸出電流不得超過170mA,請注意負載的工作電流!
4.MCU端(非隔離端)的GND與SEN端(隔離端)的GND是相互隔離的,嚴禁將其短接!
5.工作過程中,隔離電源模組會發熱,屬正常現象。
技術規格
- 工作電壓:5.0V
- 回應時間:4秒(typ)
- 兩端模擬量誤差:<±20mV(typ)
- 介面類別型:PH2.0-3P
- 空載電流:75mA(typ)
- 產品尺寸:42*32mm
- 非隔離端(接主控板)
供電電壓:5.0±0.1V
模擬輸出:0~5.0V - 隔離端(接感測器)
輸出電壓:5.0±0.2V
模擬輸入:0~5.0V
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如下圖所示,這款模擬量隔離模塊有左邊和右邊兩個接口。
左邊接口,名稱為SEN,和傳感器模塊連接;右邊接口,名稱為MCU,和主控板連接。
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使用教程
本教程以電導率傳感器為例,演示如何把這個模擬量隔離模塊接入電路中,對傳感器模塊進行電氣隔離。
電導率傳感器會向液體裡釋放高頻電信號,因此,如果同一容器裡的溶液中還有其他水質傳感器,如pH傳感器,就會受到嚴重干擾。因此需要將這個電導率傳感器進行電氣隔離。
準備
- 硬件
- 1 x Arduino UNO控制板(或類似的主控板)
- 1 x 傳感器模塊(本教程以電導率傳感器模塊為例)
- 1 x PH2.0-3P模擬線
- 1 x 雙頭PH2.0排線
- 1 x 模擬量隔離模塊
接線圖
如下圖所示,將傳感器模塊連接到隔離模塊的SEN端(實際連接時請使用雙頭PH2.0排線,該排線隨產品附贈)。然後將隔離模塊的MCU端連接到Arduino主控板。這就完成了電導率傳感器的電氣隔離。
Gravity: Analog Signal Isolator
INTRODUCTION
In many cases, electrical isolation is required to ensure reliable operation of the sensors. Some sensors, such as pH sensors and conductivity sensors,they will interfere with each other and do not measure properly in the same container when they connect to the same power .To ensure stable and reliable operation of the sensors with no interference,it is necessary to isolate the signal and the power.
Gravity: Analog Signal Isolator is efficient in preventing the electrical interference between sensors. This module has an onboard 5V isolation power which could directly supply to the sensor. Therefore, you do not need to prepare the external power, such an easy and practical! The connector of wires are special designed for DFRobot 3Pin analog sensor, plug and play, no need for soldering. The analog signal transmission ratio is 1:1, which contributes to a very small impact on output signals of sensors when this module connect into the circuit. Futher more, you do not need to change the code of the mainboard.
This anlaog signal isolator is applicable to prevent interferences between sensors, such as multi-parameter water quality monitoring system that need to prevent interferences between water sensors.

Gravity: Analog Signal Isolator Interface
This product is almost compatible with all analog sensors produced by DFRobot. It could satisfy varied demands in situations which require electrical isolation.
- The MCU terminal (non-isolation terminal) should be provided with precise voltage of 5.0±0.1V. The higher the precision of input voltage, the higher the precision of analog output signal.
- This module consumes relatively large current during operation, so you’d better to provide external power supply to Arduino board to guarantee enough power and voltage precision.
- Please pay attention to the operating current of your sensor or module, the maximum output current from SEN terminal is 170mA.
- The GND of the MCU terminal(non-isolation terminal) and the GND of SEN terminal (isolation terminal) are isolated from each other. Do not short circuit them.
- It is normal for the isolator generates heat while working.
SPECIFICATION
- Operating Voltage: 5.0V
- Response Time: 4 seconds (Typ)
- Analog Error between Two Terminals: <± 20mV (Typ)
- Conector Type: PH2.0-3P
- No-load Current: 75mA
- Dimension: 42 * 32mm / 1.65 * 1.26 inch
- Non-isolation Terminal (MCU Terminal)
Supply Voltage: 5.0 ± 0.1V
Analog Output: 0 ~ 5.0V - Isolation Terminal (SEN Terminal)
Output Voltage: 5.0 ± 0.2V
Analog Input: 0 ~ 5.0V
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