Over 60% of aquaculture losses are triggered by acute ammonia and nitrite poisoning, yet single-parameter testing cannot warn of synergistic toxicity. The Erun Environmental multi-parameter aquaculture water tester integrates five key indicators – ammonia, nitrite, dissolved oxygen, conductivity, and sulfate – and has passed CE, ISO 9001, and RoHS certifications. One instrument meets all the needs of an export-oriented farm for fast, compliant, and precise water quality management.
Why must ammonia, nitrite, and dissolved oxygen be monitored simultaneously?
Answer first: Low dissolved oxygen significantly intensifies the toxicity of ammonia and nitrite; the three must be measured simultaneously to truly assess the immediate risk posed by the water to cultured animals.
When dissolved oxygen falls below 4 mg/L, fish and shrimp tolerance to nitrite drops by over 50%; rising pH, in turn, sharply increases the proportion of free ammonia within total ammonia nitrogen. Measuring only one parameter hides potentially fatal combined effects. The Erun multi-parameter instrument reads all three sets of data at once, automatically flags the risk level, and ensures intervention always outpaces losses.
What certifications and parameters must a compliant export-grade tester possess?
Answer first: An export aquaculture water tester must obtain CE EMC and safety directives, RoHS hazardous substance restriction, and ISO 9001 quality system certification, and the testing parameters must cover nitrite, ammonia, dissolved oxygen, conductivity, and sulfate.
The Erun Environmental ERUN-SP series has fully passed the above certifications and comes with an SGS third-party test report. The instrument is calibrated against NIST-traceable standards, so it can directly serve as technical compliance proof during customs clearance, helping to avoid port rejection risks in destination countries.
Testing parameter | Method | Range | Accuracy / Detection limit |
|---|
Nitrite | Spectrophotometry | 0–1.0 mg/L | 0.001 mg/L |
Ammonia | Salicylate spectrophotometry | 0–10.0 mg/L | ±5% |
Dissolved Oxygen | Fluorescence quenching | 0–20.0 mg/L | ±0.1 mg/L |
Conductivity | Four-pole electrode | 0–200 mS/cm | ±1% F.S. |
Sulfate | Turbidimetric method | 0–200 mg/L | 0.1 mg/L |
How does the Erun Environmental multi-parameter aquaculture water tester improve farming performance?
Answer first: The Erun ERUN-SP aquaculture water tester switches wavelengths with one button, delivering all five readings from a single sample in just three minutes, with a nitrite detection limit as low as 0.001 mg/L – helping you reduce the risk of ammonia exposure by 60%.
The instrument features built-in GPS and data logging, capable of generating traceable reports that meet GAP aquaculture certification requirements. In field tests on shrimp farms in Thailand and Indonesia, after adopting this instrument, the feed conversion ratio dropped by 9% due to reduced water quality fluctuations, and the survival rate of adult shrimp rose to over 87%.
How can multi-parameter data be used to predict sudden water quality deterioration?
Answer first: A sudden simultaneous jump in conductivity and sulfate can serve as an early signal of groundwater contamination or saltwater intrusion, and when combined with the ammonia trend line, it enables 24-hour risk early warning.
When conductivity rises by more than 500 μS/cm within 6 hours and sulfate concentration increases abnormally at the same time, it often signals external pollution or salinity shock. The Erun tester features threshold setting and audible/visual alarms, helping operators initiate water exchange or aeration measures before fish or shrimp show stress responses.
What special requirements apply when exporting to European, American, and Southeast Asian markets?
Answer first: The EU requires instruments to pass CE-EMC immunity testing and comply with the EN 61326 laboratory equipment standard; many Southeast Asian countries require a copy of an ISO 17025 calibration certificate, and the instrument interface is advised to support English and local languages.
The Erun Environmental ERUN-SP series is shipped with multilingual operating systems including English and Chinese as standard, and comes with an editable COC declaration template. All sensors and reagents are accompanied by RoHS declarations, preventing the whole batch from being rejected due to a single non-compliant part.
answer FAQ
Q: Can the multi-parameter tester measure both seawater and freshwater?
A: Yes. The instrument has a built-in conductivity compensation algorithm that automatically corrects the influence of ionic strength on ammonia and nitrite test results, making it suitable for both freshwater and mariculture.
Q: Do the ammonia and nitrite reagents need to be refrigerated?
A: Unopened reagents can be stored at room temperature for 12 months. They are packaged in individual aluminum foil pouches to avoid cross-contamination, meeting transportation and maritime export conditions.
Q: Does the instrument support on-site mobile testing?
A: Yes. The main unit weighs only 1.2 kg, and the built-in lithium battery supports 8 hours of continuous operation. In the field without a power supply, it can complete more than 200 full-parameter tests.
Q: Is sulfate testing affected by turbidity interference?
A: The turbidimetric method automatically deducts the sample’s background turbidity. When the water sample turbidity is below 50 NTU, the deviation is less than 3%; high-turbidity samples can be pre-filtered.
Q: Can one instrument satisfy audits for international certifications such as BAP and ASC?
A: Yes. The device generates tamper-proof records with timestamps, GPS coordinates, and operator IDs, which can be used directly for BAP, ASC, and other Best Aquaculture Practices audits.
Erun Environmental – 15 years of focus on water quality analysis instruments, delivering trusted, compliant data for every gram of aquaculture water worldwide.
