How To Measure Nitrates In Water

We manufacture Nitrate parameter electrodes for measuring and monitoring nitrates in water.

Aquaread’s nitrate testing equipment is primarily designed for use in the field, ideal for short term testing, as well as long term deployment. Our equipment can be used for commercial and industrial applications, for example in discharged factory wastewater and treated wastewater that is about to be released into a river. It also has very beneficial environmental monitoring uses.

This page will give you an insight into how to measure nitrates in water with Aquaread’s dedicated equipment.

Our nitrate electrodes are scientifically precise, measuring between 0 – 1,000 mg/L and is accurate to +/- 10%.

Nitrate Range 0 – 30,000mg/L (ppm)
Resolution 2 Auto-range scales: 0.00 – 99.99 mg/L, 100.0 – 30,000 mg/L
Accuracy ± 10% of reading

Our AP-2000 and AP-5000 Aquaprobe packages are completely portable and come in a carry case for easy transport between monitoring sites. Our ISE sensors are well suited to portable applications as they require regular calibrations to achieve the best results.

The GPS aquameterThe aquaprobe AP5000


Our Ion Selective Electrodes Last Longer

Our ISE sensors last longer as we use a solid state sensor. This has the ionifer cast into a PVC membrane. This is a unique technology and means that all the time the sensor is dry, it is not ageing. Our sensor can last up to five years out of water and has a minimum life of 6000 wet hours.

All of our competitors have a liquid filling behind the membrane, which means that as soon as they are made, they start to age whether they are in water or not.

Our ISE sensors do require regular calibration every 2-3 weeks to achieve the best results, calibration solutions can be purchased directly from us to make things easy for you.

How To Calibrate the probe

    1. When an Nitrate ISE electrode is first installed, it must be calibrated at three points. In order to achieve this, three batches of Nitrate calibration solution must be prepared. Consult the product manual for a full guide to the Three-point Calibration necessary for the measurement of nitrate in water.

    2. Remove the Probe Sleeve and the Wiper. Remove the storage cap from the electrode, wash the Probe in distilled water, dry the probe thoroughly then gently lower the Probe in to the solution.

    3. Switch the Aquameter on and stir the probe until the temperature and NO3 readings are completely stable. A minimum of five minutes is recommended. Ensure the temperature of the solution is correct for whatever point you are calibrating.

    4. Press the MENU key then select Calibration. Select Full Cal, then click Aux Electrodes. The Nitrate (NO3) electrode should have been assigned to an AUX socket when it was fitted. Move the pointer to NO3 then press the OK or right arrow key to select.

    5. Calibration point 1 (Pt-1) is the warm 10ppm point. Calibration point 2 (Pt-2) is the warm 100ppm point. Calibration point 3 (Pt-3) is the cool 10ppm point. The dates shown to the right of each point are the dates of the last successful calibration.

    6. Select the calibration point required. The Meter will wait until the readings are stable, then it will send the calibration command to the Probe, where the calibration takes place. During calibration, the Calibrating screen is displayed and the progress counter counts up. If the calibration is successful, the counter will reach 100%.

    7. The Calibration Report on the top line displays the voltage output from the ISE electrode in millivolts (mV). This value is not stored in memory so should be noted down in a calibration record book for the probe along with the temperature.

Logging options

All of our Aquaprobe packages are supplied with a GPS Aquameter for remote data collection. We manufacture and supply different data logging devices to match your logistical data needs. Find out more about these on our Logging Options page.

Get in touch with Aquaread today

To find out more about how to measure nitrates in water, get a quote or get further support, get in touch with us via our contact form on this page or giving us a call on +44 8442 221 206. More details are available on our contact page.

Why not download one of our comprehensive product manuals for more instructions and information on our nitrate measuring equipment?

Comments are closed.

Aquaread® - Community Trade Mark Registration No. 011713815
Aquaread® - Australia Trade Mark Registration No. 1436803
LeveLine® - Community Trade Mark Registration No. 011713823
Aquaprobe® - UK Trade Mark Registration No. 00003000628
Aquameter® - UK Trade Mark Registration No. 00003000627
LoggerLink® - UK Trade Mark Registration No. 3081814
Leveline-CTD® - Community Trade Mark Registration No. 016187338
Aquaread Aquasonde® - UK Trade Mark Registration No. 00003332243

View Aquaread's Privacy Policy
Download Aquaread's Terms & Conditions
Download Aquaread's Environmental Policy
Download Aquaread's Green Procurement Policy
Download Aquaread's Quality Policy

ISO certification for ISO 9001 and 14001