Water Quality Calcium Sensor, 0.2~40000 ppm

This practical, high-quality calcium sensor for water quality measures 0.2–40,000 ppm , covering a pH range of 3–10 to suit diverse aquatic environments. The calcium ion sensor supports RS-485 MODBUS communication for seamless integration into monitoring systems. Automatic temperature compensation ensures reliable data, while the built-in high-sensitivity electrode achieves a detection limit as low as 1 ppm, meeting both laboratory and engineering requirements.

Feature

• RS485 transmission interface, MODBUS-RTU communication protocol, bidirectional communication. The communication protocol is simple and user-friendly, capable of outputting more electrode diagnostic information for enhanced intelligence.
• The SUCH calcium ion sensor features isolated power supply and output design to ensure electrical safety. Built-in protection circuits enhance interference resistance for operation in complex environments.
• Low-power design accommodates diverse applications, while internal memory retains calibration and settings during power loss.
• The PPS housing of the water quality ion sensor offers superior corrosion resistance, and the 3/4" male/female thread facilitates user installation.

Dimension (unit: mm)

Note: This ion sensor is not suitable for pipeline installation and must not be used in seawater.

Communication Protocol

The water quality chloride ion sensor employs the RS-485 Modbus communication protocol in RTU mode. Serial port parameters are (N, 8, 1) indicating no parity, 8 data bits, address 01 (modifiable), 1 stop bit, with a default baud rate of 9600 (modifiable).

Protocol Specifications

• In this protocol, data followed by the letter “H” indicates hexadecimal representation.
• Negative integers are stored in two's complement format. All registers are double-byte, transmitted with the high byte preceding the low byte.
  For example, -1 is represented as FFFFH, and -2 as FFFEH.
• All host computer commands received by the sensor are 8 bytes long. Any data beyond the first 8 bytes is invalid, but the initial 8-byte command remains valid. If a 0.1-second pause occurs before the full 8-byte command is received, the command is considered invalid.
• Refer to the CRC worksheet for CRC checksum calculation. When transmitting, the high byte precedes the low byte. When the checksum is 2A2AH, the instrument passes without verification.

Wiring Diagram