XT-Ⅳ chemical oxygen demand (CODCr)online automatic water quality monitor

Technical specifications

• Method: dichromate method(HJ828-2017); chemical oxygen demand (CODCr)online automatic water quality monitortechnical requirements and test method(HJ/T 377-2019 ).
• Measuring range: 0 mg/L-200mg/L, 0 mg/L-1000mg/L, 0 mg/L-1500mg/L, 0 mg/L-3000mg/L, 0 mg/L-5000mg/L, 0 mg/L-10000mg/L, 0 mg/L-15000mg/L(otherrangeexpandable).
• Repeatability: ≤5%.
• 24hconcentrationdrift: ±5mg/l.
• 24hconcentrationdrift: ±5%(15 mg/L–200 mg/L); ±3%(200 mg/L–2000 mg/L).
• indicationerror: ±10%(20%*FS FS=200mg/L); ±8%(50%*FS FS=200mg/L); ±5%(80%*FS FS=200mg/L); ±3%(200 mg/L–2000 mg/L).
• consistency: ≥90%.
• real-sample comparison: COD＜50mg/l, absoluteerror≤5mg/l; COD≥50mg/l, relativeerror≤10%.
• data validity: ≥90%.
• limit of quantitation ≤15 mg/L(indicationerror ±30%).
•  detection limit: 10 mg/L.
• memory effect 80%*FS→20%*FS ±5 mg/L(FS=200mg/L); 20%*→80%* ±5 mg/L(FS=200mg/L) 
• voltage influencetest  ±5%.
• chloride ioninfluence test  ±10%.
• Ambient temperatureinfluence test  ±5%.
• waste-liquid separation Functions.
• standard-solution check Functions.
• spike recovery Functions.
• fault reset and power restoration, the analyzer automatically discharges residual reagents, automatic cleaning, automatically resets to restart the test Functions.
• alarms and power loss do not cause data loss.
• outputretained sample, triggered sampling Functions.
• reagent-low alarm, component-fault alarm, sample-fault, over-limit and other alarms Functions.
• touchscreendisplay and command input.
• sampling cycle: time interval(10 min–9999 minfreely adjustable) and on the hourmeasurementmode.
• calibration interval: 1–99adjustable to any interval and time of day.
• maintenance interval: typically once a month, about 30 min.
• output: 1-channel national-standard 212 RS-232, 1-channel Mod-Bus RS-232(RS-485), 1-channel 4 –20 mA.
• Power supply: AC220±10% V, 50±10% Hz, 5 A.
• dimensions: 1500 mm×500 mm×450mm(×× D).
• environmentrequirements: Ambient temperature: 5℃–40℃; temperatureadjustable indoor, recommendedtemperature25 ℃–28 ℃; humidity≤90% RH(non-condensing).