Frequently asked questions

Browse the topics below to find answers to the questions we’re asked most often.


What are maximum and minimum nitrate and nitrite levels that can be measured?

Analytical Range*

- Nitrate: 0.6 - 500 mg/L as NO3- (0.14 to 113 mg/L as N)
- Nitrite: 0.05 - 100 mg/L NO2- (0.01 to 23 mg/L as N)

*We can supply custom ranges within these broad limits by adjusting the sample loop to suit your analytical needs

Over what temperature range can Aquamonitrix® operate? 

The system can operate over a temperature range of 10°C to 40°C.

Can the system operate on its side or lying down? 

The defined operating orientation is vertically upright, as per the image below:

How frequently can a sample be analysed?

The system can analyser a sample every 15 minutes, which is equivalent to a maximum of 96 samples per day.

Can we alter the sampling frequency during night-time periods relative to day-time?

The sampler can be programmed to vary the sample frequencies. This needs to be done by a service engineer.

Are there any checks that must be performed by the operator during the deployment period?

Yes. A general visual inspection of the unit should be carried out to ensure the inlet filter line and tube are free from blockages. The inlet tube and filter could be rinsed on a regular basis to extend their lifetime.


Sample Matrix

Can the analyser handle darkly coloured effluent or samples with a high suspended solids content? 

Yes, but we need to capture this information in the customer questionnaire prior to provision of the analyser. The unit is not suitable for deployment in aeration tanks or biological reactors.

Is the analyser suitable for handling seawater?

No saline waters are problematic for the analyser. We are currently developing a saline-compatible version.

In wastewater influent, does the equipment suffer from clogging? Do you have to run a supplemented filter?

The sample intake system has been designed to be robust in wastewater, and its performance in septic tanks without clogging or blocking  has been demonstrated in trials by the US EPA.

We are currently trialling performance in aeration basins.  Here,  some low-cost pre-filtration may be required.



What is the maximum head the analyser can lift? 

Up to 3 meters.

What precautions should I take to avoid the in-take tube getting blocked? 

The sample intake line should be positioned in a manner so the intake is suspended in the middle of the water sample. Regular cleaning of the inlet tubing and filter will prolong the life of the sample tubing and keep it free from blockages.



Is the Aquamonitrix® analyser calibrated when it arrives?

The unit will be calibrated in the factory prior to despatch to site.  The service engineer will confirm this calibration on site during installation.

How often do I need to re-calibrate the analyser?

The analyser holds its calibration for the deployment period. In trials, calibration has remained stable over deployments of six months.

Where can I get purchase standards to re-calibrate the analyser?

Standards for re-calibration are available from



How often does the system need to be serviced?

We recommend four services per year.

Who can service the unit? 

Personnel who have received suitable training by Aquamonitrix ltd. This could be internal team, one of our service partners or an agnostics service provider. Service is straightforward and we provide training by video.


Communication via SCADA

Can the unit be connected to a SCADA System? 

Yes. It can also be connected to Datamonitrix, as below.


Communication via Datamonitrix

Can several users access the Datamonitrix data management portal?

Yes - you can add/remove team members and assign access levels.

Can I have more than one analyser on the portal? 


Can the analyser be connected to a SCADA system as well? 

Yes, system can be connected to a SCADA system in parallel.

Can the system alert me if it records a high reading? 

Yes – Datamonitrix can be used to set defaults and configure alarms.

Can the system increase the frequency of testing if it detects a high reading?

Yes, but the analyser would need to be manually adjusted via the IoT interface.

Can data be output in a format and structure needed by an organisation's database?

Yes. The digital output from the analyser is suitable as an input to the customer's choice of environmental data management system.


Power Supply

How long will the battery last?

The battery is a backup feature. Its purpose is to allow the unit to ride through any short duration brown/black outs in the customer’s power supply. If the unit is in the process of a run when the power loss occurs, the sample will complete. From a fully charged state, the battery should hold for several days.

Is it safe to leave the Aquamonitrix® analyser outside in the rain? 

The unit is IP65 rated, so leaving it out in the rain shouldn’t have any negative impact. The only caveat would be that care should be taken with opening the unit to prevent exposing it to the elements.

Where can I buy a replacement power lead
What is the power supply? AC or DC?

15 - 25 V dc input power, 50W max. rated power

Can the instrument be run with a battery/solar panel?

The current commercial model requires a mains power source. However, we are at the advanced stages of commercialising a solar powered unit, being developed for portable and remote monitoring.



How often does the reagent need to be refilled?

The duration before a reagent-re-filled is required depends on the sampling frequency. The analyser holds a maximum of 2 litres of eluent, and each sample consumes 3.3 ml. With a frequency of 6 samples per day, the reagent will last for 100 days – or over 3 months.

Sampling FrequencyNumber of Samples Per DayDuration of Deployment
Every 4 hours6100 days
Every 2 hours1250 days
Hourly2425 days
Every 15 minutes966 days

Is the eluent hazardous?

Yes. The eluent is a potassium hydroxide solution (KOH @ 120mM concentration).  The Safety Data Sheet for the reagent contains the following hazard statements: “May be corrosive to metals. Causes severe skin burns and eye damage.”

Where can I purchase more eluent?


What is the eluent shelf-life? 

6 months