Product - Process pH Sensor - Analog vs. Digital

What is the difference between analog and digital sensors?  

Analog sensor    pHD sc Online

The primary difference between Hach analog and digital pH sensors is in how the sensor sends information to the Hach sc controller. Hach digital pH sensors convert a continuous stream of analog voltage and/or current signals from the sensor into discrete, “quantized” values within the sensor itself, whereas analog pH sensors require a separate digital gateway to make this conversion from analog to digital information.

What are the benefits of digital sensors?  

Hach digital pH sensors use an innovative “plug and play” design, making it very easy for customers to setup and run the pH system right out of the box.  Digital sensors connect directly to the Hach sc controllers, whereas analog pH sensors require a gateway, imbedded in the system loop either between the sensor and controller, or within the controller itself. 

Digital signals are less susceptible to potential interference leading to higher quality, more reliable measurement values. Analog signals by contrast can be affected by electrical interference or “noise”, which can potentially degrade the quality and reliability of the measurement.

How do I know if my sensor is digital or analog?  

All LCP Product Family and Low-Cost Combination sensors are analog sensors and will require a separate gateway to be used in conjunction with Hach sc controllers.

The pHD Product Family is available as either analog or digital pH sensors, the most common being the digital sensor version.  All digital pHD products have part numbers that begin with “DP” (eg. DPD1P1), whereas the analog pHD product part numbers start with a “P” (eg. PD1P1).  Another distinguishing feature is that digital sensors come equipped with an M12 cable connection to easily connect the sensor to a Hach sc controller, while the analog sensors will have exposed wires which must be connected to the digital gateway.

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