BOQU BH-485-NH Manuel utilisateur

Operating Manual of Ammonia Nitrogen Sensor

BH-485-NH

Ammonia Nitrogen Sensor

User Manual

Shanghai BOQU Instrument Co.,Ltd

Operating Manual of Ammonia Nitrogen Sensor

Table of Contents

Chapter 1 Product Overview...................................................................................................................... 1

1.1 Product Information........................................................................................................................1

1.2 Safety Information..........................................................................................................................2

1.2.1 Use of Danger Information................................................................................................ 3

1.2.2 Warning and Prevention Labels......................................................................................... 3

1.3 Pressure Limit.................................................................................................................................3

1.4 Temperature Limit.......................................................................................................................... 4

1.5 Minimum Requirement for the Depth............................................................................................ 4

Chapter 2 Introduction to the Probe..........................................................................................................4

2.1 Temperature Sensor........................................................................................................................ 4

2.2 pH Sensor....................................................................................................................................... 5

2.3 Ammonia Nitrogen Sensor............................................................................................................. 6

2.4 Potassium Ion Sensor..................................................................................................................... 7

Chapter 3 Installation..................................................................................................................................8

3.1Sensor connection............................................................................................................................8

3.1.1 Specific steps for instrument connection.....................................................................................8

3.2 Installation of Sensors.................................................................................................................... 9

3.2.1 Quick Dismantling pool side fixed installation..................................................................9

3.2.2 Classic pool side fixed installation...................................................................................10

3.2.3 Railing fixed installation.................................................................................................. 11

Chapter 4 Software Installation and Use.................................................................................................12

4.1 Software Installation.....................................................................................................................12

4.2 Software use................................................................................................................................. 13

4.2.1 Online data....................................................................................................................... 13

4.2.2 Calibration........................................................................................................................14

4.2.3 Historical data.................................................................................................................. 14

4.2.4 System Settings................................................................................................................ 15

4.2.4.1 Device Settings......................................................................................................15

Operating Manual of Ammonia Nitrogen Sensor

4.2.4.2 Software Settings.................................................................................................. 16

4.2.4.3 Program upgrade................................................................................................... 17

4.2.5 System Information..........................................................................................................17

Chapter 5 Calibration of Sensors............................................................................................................. 18

5.1 Probe Settings...............................................................................................................................18

5.2 Basic Process of Calibration.........................................................................................................19

5.3 Temperature sensor calibration.....................................................................................................20

5.4 pH sensor calibration....................................................................................................................20

5.5 Ammonia Nitrogen Sensor Calibration........................................................................................ 22

5.6 Potassium Ion Sensor Calibration................................................................................................ 24

Chapter 6 Maintenance............................................................................................................................. 26

6.1 Sensor Maintenance......................................................................................................................26

6.1.1 Temperature Sensor Maintenance.................................................................................... 27

6.1.2 pH Sensor Maintenance................................................................................................... 27

6.1.3 Ammonia Nitrogen Sensor Maintenance......................................................................... 27

6.1.4 Potassium Ion Sensor Maintenance................................................................................. 29

6.2 Storage of Sensor..........................................................................................................................29

6.2.1 Short Term Storage...........................................................................................................29

6.2.2 Long Term Storage...........................................................................................................30

6.3 Maintenance of Cable...................................................................................................................30

6.4 Inspection on the Damage of Sensor............................................................................................ 30

Chapter 7 Communication Protocol........................................................................................................ 31

Chapter 8 Errors and Warnings.............................................................................................................. 37

Chapter 9 Problems and Solutions...........................................................................................................38

Chapter 10 After-sales Service................................................................................................................. 39

Operating Manual of Ammonia Nitrogen Sensor

Chapter 1 Product Overview

1.1 Product Information

The ammonia nitrogen concentration was measured by an ion selective electrode method. The ammonium

ion selective electrode directly detects the ammonium ion in the water environment to determine the

concentration of ammonia nitrogen. Use a pH electrode as a reference electrode for better stability. The

concentration of ammonia nitrogen in the measurement process is easily interfered by potassium ions, so

potassium ion compensation is required.

The ammonia nitrogen probe is an integrated sensor that is composed of ammonium ion selective

electrode, potassium ion (optional), pH electrode and temperature electrode. These parameters can

mutually correct and compensate the measured value of ammonia nitrogen, and meanwhile achieve the

measurement for multiple parameters.

It is widely used to measure the value of ammonia nitrogen in the nitrification treatment and aeration

tanks of the sewage treatment plants, industrial engineering as well as river water. The technical

parameters are shown in Table 1.

Specification

Details

Measurement Range

NH4N：0.1-1000 mg/L

K+：0.5-1000 mg/L （Optional）

pH：5-10

Temperature：0-40℃

Resolution

NH4N：0.01 mg/l

K+：0.01 mg/l（Optional）

Temperature：0.1℃

pH：0.01

Measurement

Accuracy

NH4N：±5 % of the measured value or ± 0.2 mg/L, take the

greater one.

K+：±5 % of the measured value or ±0.2 mg/L （Optional）

Temperature：±0.1℃

pH：±0.1 pH

Operating Manual of Ammonia Nitrogen Sensor

Response Time

≤2 minutes

Minimum Detection

Limit

0.2mg/L

Communication

Protocol

MODBUS RS485

Storage Temperature

-15 to 50℃ (Non-frozen)

Working

Temperature

0 to 45℃(Non-frozen)

Size

55mm×340mm（Diameter*Length）

Weight

<1KG；

Level of Protection

IP68/NEMA6P；

Length of Cable

Standard 10-meter long cable, which can be extended to 100

meters

Outer Dimension：

Table 1 Technical specification of Ammonia Nitrogen Probe

Note: Product specifications are subject to change without notice.

1.2 Safety Information

Please read this manual thoroughly before unpacking, setting up or operating the instrument.

Pay special attention to all hazard and warning statements. In the event of mishandling, it may cause

serious injury to the operator or damage to the equipment.

This equipment must be used and installed only in accordance with the detailed instructions in this

manual.

Operating Manual of Ammonia Nitrogen Sensor

1.2.1 Use of Danger Information

For all the hazards occurred, this manual will use signal specific term (Danger, Caution, Note) that

correspond to the degree of danger.

Danger

Refers to a potentially or imminently dangerous state that, if not prevented, could be

life-threatening or cause serious injury.

Caution

Refers to a potentially dangerous state that may cause mild or moderate injury.

Important Note: Information that requires special emphasis.

Tip: Information in the text that supplements the points

1.2.2 Warning and Prevention Labels

Please read all the labels and identifiers attached to the instrument carefully, otherwise it may cause

personal injury or damage to the instrument.

1.3 Pressure Limit

The maximum pressure for the immersion of the probe is less than or equal to 10 meters. When the

pressure for the underwater probe is greater than 10 meters, it will be mechanically damaged and

deformed.

If the label is marked on the instrument, refer to the instrument manual for operation

and/or safety information.

If the label is marked on the product, it indicates that there is a fuse or current limiting

device.

If the label is marked on the product, it indicates that the device is susceptible to static

electricity leakage and protective measures should be taken to prevent damage.

If the label is marked on the product, it indicates the location of the ground wire.

Operating Manual of Ammonia Nitrogen Sensor

1.4 Temperature Limit

The storage temperature for the probe should be non-frozen, ranging from 0 to 45 ° C, while its working

temperature should be non-frozen ranging from 0 to 40 ° C; Otherwise, exposing the probe outside of the

above temperature range may result in mechanical damage and electric failure.

To prevent the probe from freezing, please store the probe in a place where it will not freeze.

1.5 Minimum Requirement for the Depth

In order to prevent the sun exposure sensor, the sensor body must be completely submerged by water

when in use.

Chapter 2 Introduction to the Probe

The ammonia nitrogen probe is composed of four sensors: temperature, pH, ammonia nitrogen, and

potassium ion (optional), which can be used to monitor the wide range of physical, biological and

chemical properties of natural waters.

Figure 1 Structure Diagram of Ammonia Nitrogen Probe

2.1 Temperature Sensor

Principle：

Operating Manual of Ammonia Nitrogen Sensor

Temperature is a measurement of the amount of heat existing in a certain body of water, and it is

considered to be a very important single parameter, for it affects the other parameters of the water quality

and controls the metabolism of aquatic animals and plants.

The temperature sensor uses the thermistor to measure the temperature of the water. The resistance value

of the thermistor changes with temperature, and the measured resistance value can be converted into a

temperature value using a corresponding calculation formula. This formula has been programmed into the

host software, and users can directly view the real-time Celsius temperature through the software. The

temperature sensor is shown in Figure 2.

Figure 2 Temperature Sensor

Technical Specification of the Temperature Sensor

Principle

Thermistor Method

Range

0~40 °C

Resolution

0.1 °C

Accuracy

± 0.1 °C

2.2 pH Sensor

Principle：

pH describes the pH value and basic properties of a water body. It is acidic when pH<7.0, neutral when

pH=7.0, and alkaline when pH>7.0.

The pH sensor measures the pH value of the water in the glass electrode method. It is composed of two

parts, including a glass bubble with a glass film that selectively responds to H+, inside of which it is filled

with a 0.1 mol/L HCl internal reference solution, and an internal reference electrode Ag- AgCl. When the

electrode is immersed in the solution, the difference between the stable electric potential of the reference

electrode and the electric potential generated by the glass bubble is proportional to the H+ concentration

in the solution.

The pH sensor measures data with stability, reliable performance and easy installation. Its appearance is

Operating Manual of Ammonia Nitrogen Sensor

shown in Figure 3.

Important Tip1: When using a new pH electrode, the electrode should be immersed in distilled

water for a period of time, usually 24 hours or more, in order to form a good hydration layer. There

should be no air bubbles between the bulbs of the inner electrodes of the glass electrodes, and if

there are bubbles, the bubbles can escape easily.

Important Tip 2: Provided the pH is used in high sulfur ion environments, which is easy damaged

and with short life time.

Figure 3 pH Sensor

Technical Specification of pH Sensor

Principle

Glass Electrode Method

Range

5-10 pH

Resolution

0.01 pH

Accuracy

±0.1 pH

2.3 Ammonia Nitrogen Sensor

The NH4 ion selective electrode is a grid film electrode ，the material of which mainly uses a special

organic ion exchange membrane that dissolves in the organic solution and penetrates with the PVC mesh.

The fields it is widely used include: drinking water, fertilizer, and refrigerant. To use the electrode

requires the reference electrode, it has good repeatability and faster response time, but its accuracy is no

better than the colorimetric method. The outer appearance of the ammonia nitrogen sensor is shown in

Figure 4.

Figure 4 Ammonia Nitrogen Sensor

Operating Manual of Ammonia Nitrogen Sensor

Technical Specification of Ammonia Nitrogen Sensor

Principle

Ion Selective Electrode Method

Range

0.1~1000mg/L

Resolution

0.01 mg/L

Accuracy

±5 % of the measured value or ± 0.2 mg/L, take the greater one.

Important Tip: Ammonia nitrogen must be set to no compensation if potassium ions are not

purchased and installed.

2.4 Potassium Ion Sensor

The K+ selective electrode is a grid film electrode，the material of which mainly uses a special organic

ion exchange membrane. It dissolves in the organic solution and interpenetrates with the PVC mesh, as

the potassium ions are similar to ammonium ions in such properties (for example, size and electric

charge), and some potassium ions can also penetrate the ion selective membrane of the ammonium ion

selective sensor. As a result, the presence of potassium in the sample will result in getting a higher value

of the concentration of ammonium measured by the ammonium ion selective sensor. Therefore, with

measuring potassium, the effect of potassium can be compensated for in the ammonium concentration

measurement. The appearance of the potassium ion sensor is shown in Figure 5.

Figure 5 Potassium Ion Sensor

Technical Specification of Potassium Ion Sensor

Principle

Ion Selective Electrode Method

Range

0.5~1000mg/L（Optional）

Resolution

0.01 mg/L（Optional）

Accuracy

±5 % or ±0.2 mg/L (Optional)

Table des matières

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