Product Details
KCD310 Online COD Sensor No Reagents No Pollution Small Size More
Convenient COD Turbidity And Temperature
1.Principle
Many organic compounds dissolved in water absorb ultraviolet light.
Therefore, the content of dissolved organic pollutants in water can
be accurately measured by measuring the absorption of these organic
compounds to 254 nm wavelength UV light. KCD310 online COD sensor
uses two light sources, one ultraviolet light to measure COD
content in water, the other reference light to measure turbidity of
water, in addition, the optical path attenuation is compensated by
a special algorithm, which can eliminate the interference of
particulate impurities to a certain extent, so as to achieve a more
stable and reliable measurement.
2.Features
- No reagents, no pollution, economic and environmental protection
- Small size, more convenient installation, online continuous water
quality monitoring
- Cod, turbidity and temperature can be measured
- Automatically compensates for turbidity interference
- With a cleaning brush to prevent biological adhesion
- Small drift, fast response, more accurate measurement
- Even long-term monitoring is extremely stable
- Maintenance-free, long service life and low cost
- Digital sensor, RS-485 interface, Modbus/RTU protocol
- Low-power electronics, anti interference design
3.Technical Specifications
Model number | KCD310 |
Measuring principle | Dual wavelength ultraviolet absorption method |
Range of COD | 0-200 mg/L equiv. Khp |
Cod precision | ± 5% F.S. |
COD resolution | 0.1 mg/L |
Turbidity range | 0 ~ 100 NTU |
Turbidity accuracy | ± 5% F.S. |
Turbidity resolution | 0.1 NTU |
Calibration mode | Two-point calibration |
Output mode | RS-485 bus, Modbus/RTU protocol |
Power supply | 12 ~ 24 VDC ± 10% |
Power consumption | < 0.2w@12VDC |
Working conditions | 0ー45 °C, < 0.1 mpa |
Storage temperature | - 5 ~ 65 °C |
Protection level | IP68 |
Installation mode | Immersion mounting |
Cable length | 5 meters, other length can be customized |
Material for sensor housing | POM, 316L stainless steel |
4.Dimensional Drawing
Note: Sensor Connector is M16-5 core waterproof connector
Tips:COD Test Procedures
- Prior to completing the COD test, a series of known standards are
prepared using KHP (potassium hydrogen phthalate). Most wastewater
samples will fall in the high range, so standards of 100, 250, 500
and 1000 mg/L are typically prepared. COD standards can also be
purchased.
- A COD reactor/heating (150°C) block and a colorimeter are turned on
so that both instruments can stabilize.
- Pre-prepared low-range (3-50 ppm) or high-range (20-1500 ppm) vials
are selected for the COD test based on expected results. Both
ranges can be used if expected results are unknown.
- One vial is marked as a “blank,” and three or four vials are marked
with known standard levels. Two vials are then marked for the
wastewater sample to make a duplicate run. Note: If multiple
wastewater samples are being run, at least 10% of samples are
duplicated.
- 2 mL of liquid are added to each vial. In the case of the “blank,”
2 mL of DI water are added. 2 mL of each standard are added to the
corresponding vials. If the wastewater sample is tested at full
strength, then 2 mL is added to the corresponding vial. If dilution
is required, then serial dilutions are performed and 2 mL of the
diluted sample are added to the corresponding vial.
- Each vial is mixed well and placed into the reactor block for two
hours. After two hours, the vials are removed from the block to a
cooling rack for about 15 minutes.
- The colorimeter is set and calibrated per the specific instructions
for that unit (i.e., proper wavelength, blank and standards) and
each vial is placed in the unit and the COD concentration read.
- If the sample was diluted, the corresponding multiplication is
made.
Company Profile
Xi'an Kacise Optronics Co.,Ltd. is a professional manufacturer of
measuring instruments , located in China xi’an City. Since 2008,
Xi'an Kacise focused on the development and production of pressure,
level and flow measuring instruments .

We have been specializing in manufacturing pressure, level and flow measuring instruments and related products for 10 years. Based on experienced technical
and management personnel, through efforts of our entire staff, we
have become a professional measuring instrument manufacturer and
solution provider. And we are continuously trying to improve
product quality.

Xi'an Kacise is qualified with ISO 9001-2008, GJB 9001B-2009, CE,
intrinsic safety explosion-proof and isolated safety
explosion-proof certificates, etc. which ensure that our products
comply with international standards.

Kacise sensors have already been exported to America, Spain,
Australia, Chile and 20 other countries and regions, and received
many favorable feedbacks. Our overseas distributers are also
increasing. We regard “reasonable prices, efficient production time
and good after-sales service” as our tenet, and hope to cooperate
with more customers for mutual development.

Our goal is simple: to sell the best products at the best prices,
and provides industry-leading customer service. We personally get
to know each of our customers, and we know how to discover the most
valuable part of our business , to help others achieve their goals.