Chemical And Biological Safety; Intended Use; Theory Of Operation; Product Overview - Hach NT3100sc Manual Del Usuario

2.1.3 Chemical and Biological Safety

Chemical or biological hazards. If this instrument is used to monitor a treatment process and/or
chemical feed system for which there are regulatory limits and monitoring requirements related to
public health, public safety, food or beverage manufacture or processing, it is the responsibility of the
user of this instrument to know and abide by any applicable regulation and to have sufficient and
appropriate mechanisms in place for compliance with applicable regulations in the event of
malfunction of the instrument.
Normal operation of this device may require the use of chemicals or samples that are biologically
unsafe.
• Observe all cautionary information printed on the original solution containers and safety data
sheets prior to their use.
• Dispose of all consumed solutions in accordance with the local and national regulations and laws.
• Select the type of protective equipment suitable to the concentration and quantity of the dangerous
material being used.
2.2 Icons used in illustrations
Manufacturer supplied parts

2.3 Intended use

The NT3100sc and NT3200sc probes are intended for use by water treatment professionals to make
sure that there is a consistently-low level of nitrate and nitrite in the municipal sewage at treatment
plants, surface water, untreated water and treated drinking water. Low nitrate and nitrite levels
prevent water toxicity exposure and/or make sure of regulatory compliance.

2.4 Theory of operation

Nitrate dissolved in water absorbs UV light with wavelengths below 250 nm. The nitrate and nitrite
absorption of UV light makes it possible to photometrically determine the nitrate and nitrite dissolved
without reagents. The sensor is put directly in the medium. The color of the medium does not have
an effect on the measurement because the measuring principle is based on the analysis of invisible
UV light.

2.5 Product overview

Use the NT3100sc probe to measure nitrate concentrations and the NT3200sc probe to measure
nitrate and nitrite concentrations. Refer to
Use the probe in activated sludge tanks in municipal sewage treatment plants, surface water,
untreated water and treated drinking water, or the outlet of wastewater treatment plants. Pumping
and conditioning are not necessary. Put the probe directly into the medium.
Note: Use the flow through unit when direct measurement in the medium is not possible or it is necessary to
measure a filtered sample (e.g., very high TS content, sewage treatment plant inlet or waste dump leachate).
Connect the probe to an SC Controller for power, operation, data collection, data transmission and
diagnostics. Refer to the SC Controller manual for an overview of the controller.
The probe has a beam absorption photometer with turbidity compensation. A built-in wiper
mechanically cleans the measuring window.
Note: Enable the sludge mode to increase the number of concentration measurements done when the probe
measures in activated sludge. When sludge mode is active, several measurements are done to compensate for the
different sludge compositions.
Dissolved nitrate and nitrite, dissolved organics and particles absorb light, which has an effect on the
measurement absorbance value. The probe adjusts for this turbidity interference. However, there
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D A N G E R
Mandatory action Do not use tools
Figure 1.
Do steps in reverse order