Basic Water Quality Analyzer
pH Meter

SMR04 series

pH Analyzer

The pH Analyzer is connected directly via RS485 communication interface, providing simple, reliable, cost-saving process data with remote monitoring, calibration, configuration and diagnostics capabilities.
Housing in a robust IP68 proof enclosure, 1500 N tensile strength Kevlar reinforced cable, up to 1.2 km digital data transmission, the pH Meter is ideally used in water/wastewater industry.
  • Robust IP68 Water Submersible Enclosure, Solution Without Cabinet
  • On-line Realtime Measurement
  • Ultra Low Power Consumption, Ideal for Outdoor Applications
  • Temperature Compensation
  • High Reliability, Drift Free
  • Surge Protection for Power and RS485 Communication
  • 1.2 Km RS485 Digital Communication, Minimize Cabling and Engineering Cost
  • Software Configuration Calibration and Data Monitoring
  • Standard Modbus RTU Protocol, Direct Connected with PLC, HMI, Eliminate I/O Module Cost
  • Onboard memory allowing users to easily calibrate and configure sensor at lab and distribute to various fields sites
SMR04 pH Sensor 
Measurement range 0 ~14 pH
Accuracy ±0.1 pH
Resolution 0.01 pH
Operation pressure Max. 10 Kgf/cm
Operating temperature 0 ~ 85 °C
Process flow rate Min. 0.1 m/s
Response time 1 sec
Protection IP68
Temperature sensor Pt1000
Temperature measurement range 0 ~ 60 °C
Temperature accuracy ±0.5 °C; ±0.1 °C (optional)
Process Connection M26x1.5
Sensor Material Glass
Housing Material POM
Dimension Φ 26 Χ 221 mm
Weight analyzer: approx. 150 g 
cable: 80 g/m
Typical Application
Drinking water, surface water, groundwater, industry, water treatment, wastewater
  • Output Signal: RS485 (Modbus RTU protocol), 19,200 bps, 8 data bits, no parity, 1 stop bit; 4~20 mA (optional)
  • Data Resolution: 16 bits (0.001% FS)
  • Surge Protection: 4000 V DC
  • Power: 3.6~12 V DC ±10%, 20 mA
  • Protection: polarity, overload, short circuit
  • Safety: CE, FCC
Measurement Method
The analyzer complies with BS 2586:1979 and BS EN 60746-2: 2003 which consists of a pH electrode, a signal amplifier, and a reference electrode. The pH sensing electrode acts as a transducer that generates and transmits different levels of voltage based on the concentrations of free hydrogen ions in water. The amplifier increases the signal so that it can be measured. The isolated reference electrode produces a baseline signal that is compared to the response from the active plt electrode, generating a pH unit measurement. 

Standard cable length is 3 m, customized length is available upon request