Wholesale Sensor Chlorine Supplier & Pricelist

Bare-electrode constant-voltage chlorine sensors utilize exposed noble metal (Gold or Platinum) pins directly touching the process water, which eliminates the recurring cost of replacing delicate polymer membranes and gel electrolytes. They rely on constant hydrodynamic flow velocity or hydrodynamic mechanical scrubbing beads to prevent polarization. Membrane-covered sensors pass chlorine through a microporous gas-permeable PTFE membrane into an internal electrolyte buffer, isolating the cathode from ionic interference and surfactants, making them ideal for complex, oily, or variable conductivity wastewater streams.

When chlorine gas or hypochlorite dissolves in water, it forms Hypochlorous Acid (HOCl) and Hypochlorite Ions (OCl⁻). Amperometric sensors directly measure only the electrically neutral HOCl molecule, which has up to 80-100 times stronger biocidal efficacy than OCl⁻. However, as process water pH rises from 6.5 to 8.5, HOCl dissociates rapidly into OCl⁻. Without simultaneous inline pH sensing and dynamic micro-algorithmic calculation, a standard chlorine sensor will mistakenly report a massive drop in free chlorine even when total chemical disinfectant concentration remains identical.

Standard OEM/ODM production batches have a low baseline Minimum Order Quantity (typically 5 to 10 units for complete transmitter systems and 20 to 50 units for replacement electrochemical cartridges). Standard models dispatch within 3 to 7 business days from our Shanghai warehouse. Custom engineering orders (special communication registers, proprietary branded housings, or multi-parameter skid panels) typically ship within 14 to 21 business days via DHL, FedEx, or consolidated sea freight.

Yes. Every sensor module and controller supports standardized industrial communication protocols. Our digital IoT sensors output direct RS485 Modbus RTU (standard 9600 baud, 8-N-1), enabling direct daisy-chain connection to Siemens, Allen-Bradley, Schneider Electric, or Mitsubishi PLCs without needing auxiliary signal converters. Additionally, our wall-mounted controllers feature isolated 4-20mA analog loops and programmable SPDT mechanical relays for direct dosing pump pacing.

Amperometric sensors require an initial zero-point check (using chlorine-free dechlorinated water or activated carbon filtered water) followed by a slope span calibration using a validated DPD photometer or portable colorimeter test kit. In standard municipal potable water, calibration drift is typically less than 2% per month, requiring span recalibration once every 30 to 60 days. Membrane modules and internal electrolytes generally require inspection and renewal once every 6 to 12 months, depending on organic fouling loads.