KWS-200 Online NH4-N Ammonia Nitrogen Sensor
Application Environment
Kacise introduces an online ammonia nitrogen sensor that requires
no reagents, is green and non-polluting, and can be monitored
online in real time. Integrated ammonium, potassium (optional), pH
and reference electrodes automatically compensate for potassium
(optional), pH and temperature in water. It can be directly put
into installation, which is more economical, environmentally
friendly and convenient than traditional ammonia nitrogen analyzer.
The sensor has a self-cleaning brush that prevents microbial
adhesion, resulting in longer maintenance intervals and excellent
reliability. It adopts RS485 output and supports Modbus for easy
integration.
Feature
- Digital sensor, RS-485 output, support MODBUS
- No reagents, no pollution, more economical and environmentally
friendly
- Automatically compensates for pH and temperature in water
- Self-cleaning brush to prevent microbial adhesion and longer
maintenance intervals
Technical Specifications
| Model | KWS-200 |
| Measuring Range | 0-1000mg/L NH4-N |
| Accuracy | 5% |
| NH4-N Resolution | 0.1 mg/L |
| Ph Range | 4-10 |
| Ph Accurate | ±0.1 |
| Ph Resolution | 0.01 |
| Protection Grade | IP68 |
| Deepest Depth | underwater 10 m |
| Temperature Range | 0 ~ 50℃ |
| Output | RS-485, MODBUS protocol |
| Power Supply | DC 8~26V, current <50mA |
| Size | Φ26*177.5 mm |
| Cable Length | 5 m, customizable |
| Material | POM |
Dimensional Drawing
Installation and Electrical Connection
1. Installation
Note: The sensor should not be installed upside down or
horizontally when installed, at least at an angle of 15 degrees or
more.
2. Electrical Connection
a) Red line - power cord (12 ~ 24V)
b) Black line - ground (GND)
c) Blue line - 485 A
d) White line - 485 B
e) Bare wire - shielded wire
After wiring is completed, it should be carefully checked to avoid
incorrect connections before powering up.
Cable specification: Considering that the cable is immersed in
water (including sea water) for a long time or exposed to the air,
the cable has certain corrosion resistance. The outer diameter of
the cable is Φ6 mm and all interfaces are waterproof.
Maintenance
1. Use and Maintenance
Rinse the electrode in distilled water (or deionized water), blot
dry, and do not dry. Place the electrode on the electrode holder.
Prior to use, the tip of the electrode was immersed in distilled
water (or deionized water) for 10 minutes and then immersed in the
diluted ammonium ion solution for 2 hours.
Keep the electrode dry before use. The sensing element of the
electrode should be placed in the protective bottle. The electrode
should be immersed in the activation solution for 24 hours before
testing. If stored overnight or longer, clean the electrode tip
with deionized water, wipe dry, and place in the original
packaging.
Check if the terminal is dry. If it is stained, wipe it with
absolute alcohol and dry it. Avoid long-term immersion in distilled
water or protein solution and prevent contact with silicone grease.
With longer electrodes, its PVC film may become translucent or with
deposits, which can be rinsed with distilled water (or deionized
water). The electrode is used for a long time. When a measurement
error occurs, it must be calibrated with the meter.
When the calibration and measurement cannot be performed while
maintaining and maintaining the electrode in the above manner, the
electrode has failed. Please replace the electrode.
The main interference ions are shown in the table below:
Interference ion concentration that produces 10% error at different
ammonium ion concentrations
| Interferences (moles/liter) | 10-4 M Ammonium | 10-3 M Ammonium | 10-2 M Ammonium |
| H+ | < 2 | < 1 | < 1 |
| Li+ | 0.2 | 0.5 | 0.5 |
| Na+ | 0.005 | 0.08 | 0.8 |
| K+ | 7*10-5 | 6*10-4 | 6*10-3 |
| Cs+ | 0.003 | 0.05 | 0.5 |
| Mg3+ | > 0.5 | > 1 | > 1 |
| Ca2+ | > 0.2 | > 1 | > 1 |
| Sr2+ | > 0.2 | > 1 | > 1 |
| Ba2+ | > 0.1 | > 0.5 | > 0.5 |
| Zn2+ | 0.001 | 0.01 | 0.1 |
| N2H5+ | > 0.1 | > 0.1 | >0.1 |
| Bu4N+ | 1*10-5 | 1*10-4 | 1*10-3 |
2. Sensor Calibration
Note: The sensor has been calibrated before leaving the factory. If
it is not beyond the measurement error, it should not be
arbitrarily calibrated.
a) Zero calibration
Place the sensor in a vial containing the zero standard solution
and wait for 5 minutes. After the value is stable, see if the
displayed value is within the error range. If not, perform a zero
calibration. Refer to the appendix for calibration instructions.
b) Slope calibration
Place the sensor in a vial containing the standard solution of the
slope and wait for 5 minutes. After the value is stable, see if the
displayed value is within the error range. If not, the slope
calibration is required. Refer to the appendix for calibration
instructions.
Quality and Service
1. Quality Assurance
- The quality inspection department has standardized inspection
procedures, advanced and perfect testing equipment and means, and
strictly in accordance with the regulations, to do 72-hour aging
test and stability test on the product, and not to allow one
unqualified product to leave the factory.
- The receiving party directly returns the product batch with a
failure rate of 2%, and all the costs incurred are borne by the
supplier. The reference standard refers to the product description
provided by the supplier.
- Guarantee the quantity of goods and the speed of shipment.
2. Accessories and Spare Parts
This product includes:
- 1 sensor
- 1 copy of the manual
- 1 certificate
- 1 ml/L and 10 mg/L calibration solution each 100 ml
- Pre-activation solution 100 ml
3. After –sales Service Commitment
The company provides local after-sales service within one year from
the date of sale, but does not include damage caused by improper
use. If repair or adjustment is required, please return it, but the
shipping cost must be conceited. Damaged on the way, the company
will repair the damage of the instrument for free.
Contact Us
Website www.kacise.com
Phone +86-17719566736
Email sales@kacise.com
Location Tangyan South Road, High-tech Zone, Xi'an City, Shaanxi
Province, China
