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Operation Manual
Nitrachek 404 measures nitrate in
plant
Nitrachek 404
soil
water
The test- strips are pre- tested.
A sticker on the container shows the lot
number that must be
displayed on Nitrachek, before starting
measuring.
Range = 5 à 500 mg/ l NO3 (+/- 10 %)
Accuracy is higher in the middle of the
range (50 – 250 mg/ l)
A plastic checker allows test the meter.
A standard solution, delivered with the
strips, allows training
and testing the whole procedure.
Dipping time = 2 s .
Get rid of a standard solution tube after 10
tests.
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Summary of Contents for Nitrachek 404
- Page 1 Operation Manual Nitrachek 404 measures nitrate in plant Nitrachek 404 soil water The test- strips are pre- tested. A sticker on the container shows the lot number that must be displayed on Nitrachek, before starting measuring. Range = 5 à 500 mg/ l NO3 (+/- 10 %) Accuracy is higher in the middle of the range (50 –...
- Page 2 Nitrachek description Battery Hatch must be closed when battery is changed. Remove the battery, if the meter is not to be used during several months. If battery is changed within 30 seconds , datas are Hatch, finger, strip carrier kept in memory.
- Page 3 Do not clap Clock functions Adjusting the date : Open the hatch and wait for CAL Press round button twice: CLOC is displayed Press square then round button : year flashes Arrow button to change year Round button : day flashes Arrow button to change day and month Press square to complete procedure.
- Page 4 Error message / checker Enter lot number Each strip box wears a sticker Error message showing the lot number to be displayed according to room temperature. To enter or modify the lot number, open the hatch, press an Test is carried on only on lot arrow button, to increase or number 5.
- Page 5 Calibration – Dipping Open the hatch. The display briefly Storage and handling of test strip shows 8 8 8 8, then "CAL" Lot number flashes. Insert test strip in strip carrier Pad downwards and facing the Storage < 1 month : dry, 15 °c towards the meter body.
- Page 6 Results Shake the strip during 3 – 4 seconds to remove any remaining excess solution. If result > 500 mg/ l NO3 If result < 5 mg/ l NO3 Let the strip react . Do not touch, wipe or dab the test strip. 3 measures per sample Calcule the average of 3 measures.
- Page 7 20 last results in memory 3 results on same sample Time Memory Week 9:37 AM Wk 2 Result in mg/ L...
- Page 8 Determination of the correction factor Maintenance - cleaning 1. Choose LOT number 5 2. Make 3 single measurements with calibration solution 100 mg/l NO3 Manipulate this instrument with care. 3. Calculate the average value of the 3 measurements 4. Correction factor KF = 100 : average value Avoid mecanical shocks, high or low temperatures, humidity.