GO SYSTEMELEKTRONIK BlueTrace Modbus Sensors User Manual

BlueTrace Modbus Sensors
User Manual

BlueTrace Modbus Sensors

Creation date: 2.12.2022
File name: DOC BlueTrace-E-2.1-BDA.pdf
© GO Systemelektronik GmbH

Introduction

This manual describes the BlueTrace Modbus Sensors of GO Systemelektronik.
At the completion of this manual, the following types of design were available:

The type of version is indicated on the laser engraved type label on the sensor body.

The products of GO Systemelektronik are constantly being developed, therefore deviations between this manual and the delivered product can result. Please understand that no legal claims can be derived from the contents of this manual.
The documentations of GO Systemelektronik products can be found at www.go- sys.de/downloads.
The symbol **** indicates a useful additional information.
The symbol   indicates a note to avoid incorrect operation.
The symbol indicates an instruction, the non-fulfilment of which may affect the measuring operation.

2 Safety Instructions BlueTrace Oil in Water Sensor and BlueTrace Crude Oil in Water Sensor

Danger: The device emits dangerous UV radiation. Use eye protection.

Description of the Sensors

The BlueTrace Modbus Sensors are compact measuring probes. All sensor electronics are located in the sensor electronics unit in the sensor body. All settings are stored in the memory of the sensor electronics unit. The resistant design of the BlueTrace Sensors allows the usage under harsh conditions, such as in corrosive media and under high pressure.
The configuration of the sensors is done with the configuration program Modbus Tool.exe.
> see Manual Modbus Tool.exe for GO Modbus Sensors
Modbus Tool.exe is included with the BlueTrace sensors. With Modbus Tool.exe you can, for example, readout sensor information, assign a Modbus address, determine the internal amplification of the input signal, calibrate the sensor and display measurement values.

3.1 Technical Data

Parameter| Oil in Water | BTEX | PAH
---|---
Measuring principle| Fluorescence measurement
Evaluation at 300 – 400 nm
Light source < 300 nm
Measuring ranges| | 0 – 30 ppm | 0 – 100 ppm | 0 – 300 ppm |
Measuring accuracy| typical 3 % FS
Measuring interval| ≥ 1 s
Parameter| Crude Oil in Water
---|---
Measuring principle| Fluorescence measurement
Evaluation at 410 nm – 600 nm
Light source < 365 nm
Measuring ranges| | 0 – 30 ppm | 0 – 100 ppm | 0 – 300 ppm |
Measuring accuracy| typical 3 % FS
Measuring interval|
Parameter| Turbidity| Temperature| TSS
---|---|---|---
Measuring principle| Scattered light measurement; Light source 860 nm| Semiconductor; Bandgap Voltage Reference| Model
Measuring ranges [ FNU]| | 0 – 50 | 0 – 100 | 0 – 1000 | 0 – 4000 || 0 – 60 °C| 0 – 5 g/ l
Measuring accuracy| typical 3 % FS| 3 % FS| 3 % FS
Measuring interval| ≥ 1 s| ≥ 1 s|
Voltage supply| 10 – 32 VDC
---|---
Power consumption| typical 0 . 5 W
Weight| 0 . 6 kg
Dimensions| see 3 . 2 Device Setup
Cable lengths| | 5 m | 10 m | 20 m |
Ambient temperature range| – 5 to + 55 °C
Ambient pressure| max. 6 bar
Body material| High- grade steel 1 . 4404 ; optional Titanium
Interface| Modbus [ RTU]

3.2 Device Setup

3.3 Connection Assignment
Assignment at the board of the BlueConnect Module
Slot X3

Assignment at the BlueSense Transducer
Slot X1/X2

Pin assignment serial interface on the BlueBox T4

! Here there is the BlueBox version with a 4-pin M8 panel plug and a 12 VDC power supply.  For versions with 3-pin M8 panel plug without 12 VDC power supply, an adapter or similar must be used.
Assignment at the motherboard of the BlueBox R1 > see Manual BlueBox R1 and Panel

Notes on Calibration

4.1 Calibration Oil in Water
If necessary, the sensor should be cleaned before calibration. see 5.3 Cleaning the Sensor
The calibration is done with the configuration programme Modbus Tool.exe from GO Systemelektronik. see Manual Modbus Tool.exe for GO Modbus Sensors
Exemplary setup:

! Distance of the sensor from the bottom of the sample container: ≥ 8 cm
Distance of the sensor from the sides of the sample container: ≥ 4 cm
Avoid ambient light, especially sunlight.

4.1.1 Specifics Calibration Oil in Water
Since the fluorescence spectrum is extremely dependent on the properties of the refined oil to be measured, the sensor functions optimally with a specific calibration to this oil. The absorption of the water also has an influence on the measurement, so that the oil should be mixed with the expected water for calibration. In low concentrations a linear behaviour can be expected, here a two-point calibration can be sufficient – however, at least a three-point calibration is recommended.

The sensor successively measures the prepared samples; then a multi-point calibration is performed with the measurement and reference values. The measurement and reference values are entered into the BlueTrace Configuration Program. With this specific calibration, the reliable measurement of the desired oil in the expected concentrations can be guaranteed.
4.1.2 Specifics Calibration Crude Oil in Water
Wenden Sie sich bitte an GO Systemelektronik.

4.2 Calibration Turbidity and TSS

• The BlueTrace Turbidity Sensor is already calibrated for turbidity measurement in FNU on delivery. If you want to perform your own calibration, contact GO Systemelektronik.
• The calibration of the TSS measurement is customer-specific with two calculation coefficients. see Manual Modbus Tool.exe for GO Modbus Sensors there 3.3 The Parameter Window there Blue Trace Turbidity>Parameter

! Distance of the sensor from the bottom of the sample container: ≥ 20 cm
Distance of the sensor from the sides of the sample container: ≥ 4 cm
Avoid ambient light, especially sunlight.

Notes on Operation

5.1 Operation Oil in Water
! Distance of the sensor from the bottom of the sample container: ≥ 8 cm
Distance of the sensor from the sides of the sample container: ≥ 4 cm
Avoid ambient light, especially sunlight.
5.2 Operation Crude Oil in Water
! Distance of the sensor from the bottom of the sample container: ≥ 8 cm
Distance of the sensor from the sides of the sample container: ≥ 4 cm
Avoid direct sunlight.

5.3 Operation Turbidity
! Distance of the sensor from the bottom of the sample container: ≥ 20 cm
Distance of the sensor from the sides of the sample container: ≥ 4 cm
Avoid ambient light, especially sunlight.

Maintenance

5.1 Maintenance Notes
Prerequisite for a trouble-free operation is a proper installation of the sensor in the measuring location, as well as regular checking of the installation conditions. The sensor must be cleaned as part of the inspection. This cleaning must be carried out at sufficiently short intervals, depending on the external influences.

6.2 Maintenance Recommendations
Although the BlueTrace Oil in Water Sensor is very easy to maintain, the following points must be noted, so that the sensor is always ready to use and gives reliable results:
▶ Regular manual cleaning of the sapphire glass pane of the sensor
▶ see 5.3 Cleaning the Sensor
▶ Yearly or half-yearly inspection of the system by GO Systemelektronik authorizedservice personnel
▶ Ensure that the sapphire glass pane of the sensor is always in fluid. A drying out of the sapphire glass pane will lead to a build up of film (depending on the type of fluid) and then a cleaning is necessary.
Blue Trace Oil in Water: BlueTrace Crude Oil in Water
Danger: The device emits dangerous UV radiation during operation.
Before maintenance, the unit must be disconnected from the power supply!
6.3 Cleaning the Sensor
The necessary cleaning interval may vary significantly depending upon location and given dirt level(1 week to 3 months). Note: If you want to prolong the manual cleaning interval, ask GO Systemelektronik foraccessories for automated cleaning
A slow, continuous change of the measurement value is an indicator of increasing impurity of the sapphireglass pane.
Caution: Never use strong organic solvents (e.g. acetone), strong acids and bases or abrasive cloths, brushes and steel wool!
Please note:
Each unauthorized disassembling of the sensor head will void your warranty.
When cleaning, pay attention to any particles that may be adhering. Remove them with compressed air before using a brush or cloth so that the sapphire glass panes are not scratched during cleaning.

6.3.1 Work Flow of the Cleaning

1. Immerse the sensor in household cleaner in tap water for about 5 minutes. Then remove heavy dirt with a soft brush or a household cloth.
2. Rinse the sensor with warm tap water. 3
3. Prepare a warm (approx. 50 °C) citric acid solution (concentration 2 – 3 %) with tap water. Immerse the sensor in this solution for 10 – 15 minutes. Then clean the sensor in this solution. Then clean the sapphire glass pane in this solution with a soft brush or household cloth.
4. Use a grease-free alkaline laboratory glass cleaner to prepare a warm (approx. 50 °C) solution (concentration 2 – 3 %) with tap water. Immerse the sensor head and spacers in this solution for 10 – 15 minutes.
5. Rinse the sensor with tap water.

Appendix A – Calibration of a BlueTrace Oil in Water Sensor

Principal method
Multi-point calibration with a blank sample and up to 9 different standard concentrations – The number of standards depends on your measurement range. It is recommended to use at least three standards.
Chemicals:

1.  Isopropanol
2. Oil that should be detected

Calibration instruments:

1. Dosing pipettes 1000 µl with pipette tips
2. 2-litre glass beakers; at least two
3. Volumetric flasks 10 ml
4. Measuring cylinders 1000 ml; at least two
5. Magnetic stirrer
6. Lint-free cloth
7. Measuring cylinder stopper
8. Laboratory stand

Preparation of the Samples

Base sample (1 % concentration):
100 µl of the oil is dissolved in 10 ml Isopropanol (use the volumetric flask).
At first pipette 100 µl of the oil into the volumetric flask. Then fill the flask up to mark.
The surface of the liquid has a concave meniscus, the lower part of the meniscus has to beon the mark.
The resulting base sample has a concentration of 10,000 ppm (1 %).
Blank-Sample
The blank sample is the water in which the oil is to be detected. If there is no oil-free water available, tap water can be used instead. Note! You can also use DI-Water but the used water should have a composition / matrix similar as possible to the water at the measuring point.

Standard-Sample
For a concentration of 10 ppm, mix 800 µl of the base sample with 800 ml Blank Sample. Other concentrations can be generated by mixing the appropriate ratios (see table below).

:
:| :
:| :
:

BlueTrace Modbus Sensors
Variant 1 (for a concentration of 10 ppm): Fill up the measuring cylinder to 800 ml with the same water you used for your Blank Sample and transfer it into the 2-litre glass beaker. Withdraw 800 µl with the 1000 µl pipette of the 2-litre glass beaker. Pipette 800 µl of the Base Sample into the 2-litre glass beaker.

Variant 2 (for a concentration of 10 ppm): Pipette 800 µl of the Base Sample into the measuring cylinder. Fill up the measuring cylinder to 800 ml. Put a stopper on top of the measuring cylinder and shake the solution, so no oil will be attached to the wall of the measuring cylinder. Immediately transfer the solution into the 2-litre glass beaker.

ATTENTION! If you use the same measuring cylinder for all your standard samples, be sure you make your standards from the lowest to the highest oil concentration, to avoid contamination of old residuals. Additional clean the measuring cylinder before you prepare the next standard sample.

Calibration procedure
On the BlueSense / BlueBox Transducer, the calibration option is selected.
Firstly, the blank sample (concentration 0 ppm) is set. To do this, you put 800 ml of the blank sample in a 2litre glass beaker and place it on the magnetic stirrer.

You must ensure that the distance between the sensor and the inside beaker wall in all directions is at least 5 cm. The beaker should also be resting on a dark surface. If there are air bubbles on the sensor, they need to be removed by dipping the sensor carefully in and out of the solution. Sometimes it can help to start the magnetic stirrer, dip in the sensor near the beaker wall, and position the sensor afterwards in the middle of the beaker.

Turn the stirrer on to 500 rpm. The sensor uses an internal averaging, on that account it takes a few seconds until a mV-value can be assigned to the concentration. Additionally the oil needs to be homogeneously distributed, therefore wait for at least 90 seconds until you start the calibration After the blank sample, the standard sample (e.g. concentration 10pmm) should be set. For this, the sensor should be placed like described before in a 2-litre glass beaker with the standard sample. Repeat the prior instructions including the cleaning process of the sensor. After the calibration, the sensor should once again be placed in the blank sample and the standard samples to check if the correct values are displayed on the BlueSense / BlueBox.
If you have questions:
service@go-sys.de
+49(0)431-58080-17
GO Systemelektronik GmbH

Appendix B – EU Declaration of Conformity BlueTrace Oil in Water

Appendix C – EU Declaration of Conformity BlueTrace Crude Oil in Water

Appendix C – EU Declaration of Conformity BlueTrace Turbidity

GO Systemelektronik GmbH
Faluner Weg 1
www.go-sys.de
24109 Kiel Germany
Tel.: +49 431 58080-0
Fax: -58080-11
info@go-sys.de

References

• sys.de - This website is for sale! - sys Resources and Information.
• GO-Systemelektronik GmbH
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