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Nutrients Analyzer

SMR21 series

Nitrate Analyzer

Description

Nitrate Analyzer is connected directly via RS485 communication interface, providing simple, reliable, cost-saving process data with remote monitoring, calibration, configuration and diagnostics capabilities. Nitrate Meter housing in a robust IP68 proof enclosure, 1500 N tensile strength Kevlar reinforced cable, up to 1.2 km digital data transmission, the NO3-N analyzer and NO3-N Meter is ideally used in water/wastewater industry.

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Features

All-in-One Compact Housing, Built-in Transmitter and Sensors
Robust IP68 Water Submersible Protection
Plug & Play, On- line Realtime Measurement
Ultra Low Power Consumption, Ideal for Outdoor Applications
1500 N Tensile Strength Kevlar Reinforced Cable
Surge Protection for Power and RS485 Communication
RS485 Digital Communication, Minimize Cabling and Engineering Cost
Standard Modbus RTU Protocol, Direct Connected with PLC, HMI
Long Term Stable Electrodes, without the Need of Frequent Calibration
Metal Membrane of Electrode to Prevent Scratch
Electrode is over 12 Months Long Period of Life
Auto Cleaning Wiper, Less Maintenance
Onboard Memory Allowing Users Easily Calibrate and Configure Sensor at Lab and Distribute to Various Fields Sites
Software Tool for Data Monitoring, Calibration, Configuration and Diagnosis

Applications

Drinking water, water treatment, wastewater, fishery

Specifications

General

Output Signal: RS485 (Modbus RTU protocol), 19,200 bps, 8 data bits, no parity, 1 stop bit; 4~20 mA
Data Resolution: 16 bits (0.001% FS)
Surge Protection: 4000 V DC
Power:5~12 V DC, 20 mA(SMR21-1); 60 mA(SMR21-2)
Protection: polarity, overload, short circuit
Safety: CE, FCC

Measurement Method
The ion selective electrode continuous measurement of nitrate is carried out with specific membrane that is selective of nitrate. That membrane creates charge seperation between the water surrounded electrode and internal filling solution. The charge is measured as a voltage that changes the concentration in the water adjacent the membrane. Compared with the traditional colorimetric method, there are many advantages such as fast response time, more accurate, easier and no reagents used.

SMR21 Nitrate (NO3-N) Analyzer

Type	Ion selective electrode
Measurement range	0~2,000 mg/L
Accuracy	±5% measured value ±0.5 mg/L
Resolution	0.01 mg/L
Repeatability	±3% measured value ±0.5 mg/L
Operation pH	pH 4~11
Operating pressure	Max. 0.2 Kgf/cm2
Operating Temperature	0 ~ 40 °C
Process flow rate	0.1~10 m/s
Response time	2 min (90%)
Protection	IP68
Temperature
Sensor	NTC 10 K
Measurement range	0~40 °C
Accuracy	±0.5 °CC
Resolution	0.01 °C
Repeatability	0.1 °C
Chlorine
Measurement range	0~1,000 mg/L
Accuracy	±5% measured valie ±0.5 mg/L
Resolution	0.01 °C
Repeatability	±3% measured valie ±0.5 mg/L
Process	M26 x 1.5
Housing	POM
Dimension	Φ 47 x 279 mm
Weight	Nitrate analyzer: approx. 1.5 Kg; Nitrate and chloride analyzer: approx. 1.8 Kg; cable: 80 g/m