The online ammonia nitrogen monitor is a device for detecting ammonia nitrogen in water（NH4+-N）Content based online devices are suitable for various water bodies, including lakes, streams, groundwater, and wastewater. This sensor measures the ammonia nitrogen value through electrode method.NH4+The electrode provides the main measurement and measures ammonia ions（NH4+）.
The waterproof level of the sensor isIP68, supportMODBUSProtocol with temperature andpHAutomatic compensation function, environmentally friendly design. Higher accuracy, wider measurement range, and stronger stability.
lAdvantages and Characteristics
lWith temperature andpHAutomatic compensation function;
The sample does not require pre-treatment and is suitable for 24/7 uninterrupted online monitoring;
lOutput standardRS485（ModbusProtocol) digital signal;
Parameter settings are more convenient and efficient;
Real time data transmission allows you to obtain timely and accurate data on monitored water bodies.
order goods:
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describe
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PN
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pH NH4-N2-in-1 sensor
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VS-620910
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PURWaterproof cable
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VS-810003-xx
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Parameter information:
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name
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Parameters
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interface
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Waterproof connector, supportsRS-485，MODBUSagreement
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range
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0.1-1000mg/LandpH 2-10
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resolution
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0.01mg/Land0.01pH
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temperature range
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0 ~ 50℃
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casingIPprotection grade
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IP68
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accuracy
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5% FS
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detection limit
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0.05mg/L
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Linearity
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NA
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Waterproof grade
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IP68
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power supply
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5V 5%
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material
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Titanium alloy,POM，PPO
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size
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Φ34x170.5mm
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support
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Water leakage alarm, automatic temperature compensation
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Cable information:
red--Vcc
white--RS485-B
bare wire- Shielded wire
green--RS485-A
black--GND
Dimensional drawing:
Calibration:
1，pHcalibration
pHOnly supported3Point calibration and standard solution are respectively4.01、6.86and9.18.
For specific calculation methods, please refer tomodbusInterface documentation.
2，NH4+calibration
First, restoreK、BThe value is the default value,K=1，B=0
a.support100mlDeionized water poured in150mlIn the beaker, add2ml ISA,Stir thoroughly and evenly.
b.Rinse the electrode with deionized water, absorb the water with a cleaning tissue, and place the electrode inaIn the solution prepared during the process.
c.Transfer1ml 1000ppmPut the ammonium ion standard solution into the beaker mentioned above and stir thoroughly. After displaying a stable reading, record the value（E1）.
d.Transfer10mlPut the same ammonium ion standard solution into the same beaker and stir thoroughly until uniform. After displaying a stable reading, record the value（E2）.
e.according tomodbusInterface documentation andE1，E2Value calculationK,BWrite the value to the sensor.
3，NH4-Ncalibration
pHandNH4+After calibration, the sensor automatically adjusts based on temperature,pH，NH4+（K+Optional) CalculationNH4-NNumerical value.
