|
|
|
| Threshold of pyrometer sensitivity |
Is it possible (with 3T pyrometers) to give them the condition to register this temperature (after the quench box ) and if it is lower than 200C, to register that it was lower than 200C ? They need to register it for each extruded billet.
In order to go to low temperatures, we are using in this device thermal electrical cooled detector.
So, as per datasheet of our pyrometer – it is able to measure 200C when emissivity≥0.1. For flat bright surface emissivity =0.04-0.05. And accordingly – minimal measured real temperature will be 245C.
For more complicated shape where ε=0.1-0.12 we can reach 200C.
Of course, with very dark object we will be able to measure even 150C, but it’s not our case....
Also very important reflected light, because off low temperature and very low signals.
Pyrometer should be fully aimed into the profile with considering that from 1.5m distance we have measurement spot about 30mm.
Otherwise we will have energy loss and Tmin will be higher as well…. See the sketch below: |
| |
 |
| |
|
| |
| Измеряемая т-ра слишком низкая |
| Пожалуйста, проверьте наличие мешающих факторов и преград между объективом термометра и расположением измерительного пятна на объекте. Центр измерительного пятна лежит на оси, смешенной относительно оси лазера: для Пирометра А3000 на 48мм и для сканера PS3000 - на 25мм. |
|
 |
|
| |
| Сообщение об ошибке "Err 80" на дисплее |
Технический вопрос от пользователя: " Прибор не индицирует измеренную температуру и на панели дисплея высвечивается сообщение об ошибке " Err 80"
Данное сообщение описано в Инструкции по эксплуатации "A3000 Вер.1.5 п. 4.1.4 Сообщение об отсутствии калибровки".
1. Первым шагом проверьте работает ли термометр с группой памяти №1. Если нет, переключите на группу №1. (Смотрите Инструкцию по эксплуатации прикладной программы SD3000_Приложение A" п. 3.3 Выбор группы памяти Термометра)
2. Переключите Термометр в Аналитический режим измерений ("Analytical") - смотрите Инструкцию по эксплуатации "SD3000_Приложение _A" п.3.2 - Переключение режима измерения Термометра)
Мы не реккомендуем использоватьТермометр AE3000 (для стандартного применения в измерениях профилей на выходе из прессав Дискретном( "Discrete") режиме.
Пожалуйста, если есть необходимость в тонкой подстройке отсчета - используйте изменения аналитического коэффициента DY. |
|
| |
| Температура слишком высока |
Comparing with the thermocouple, there is a difference of 50ºC, the Pirometer measures higher temp.
The termocouple was calibrated recently.
What is the thermocouple type? We need it in order to verify response time of thermocouple. (When you have slow response it is impossible to measure real temperature, as at the time thermocouple response profile temperature is all ready lower then real on press mouth.)
580 C is not unique; we have seen many aluminum extrusion presses worldwide where real temperature is 580C.
What is the emissivity? in many some cases high temperature indicate on reflection and that can be sometime analyze from emissivity, kindly send us a table of 3-4 measurement with thermocouple, pyrometer and emissivity data.
From picture sent we think that there is a lamp nearby projected on profile, please turn off while measurement.
Different types of T/C has different features, Please see attached pictures. Here you can see the difference between different heads to ANRITSU. It always has full attachment to profile, even when operator keeps the handle by light angle. Also other types may be too slow for moving profile measurements, and ANRITSU has time constant about 1sec. |
 |
|
| |
|
| Значение измеряемой температуры очень высокое |
ожалуйста, устраните попадание сильного постороннего света (излучения) в зону измерения пирометра.
Если значение излучательной способности для поверхности составляет 0.1-0.2, то её коэффициент отражения 0.9-0.8 соответственно. Это значит, что поверхность со свойствами зеркала отражает излучение от внешних источников прямо в пирометр. И это дополнительное количество энергии влияет на результат измерений. Влияние внешней засветки растет с уменьшением излучательной способности и с уменьшением измеряемой температуры.
Обычно, решению проблемы способствует экранирование зоны измерений от естественных (солнце) и искусственных источников излучения. |
|
| |
| Постоянная времени пирометра |
Response time of the pyrometer is automatically calculated or is there a parameter that we can fine tune?
How is pyrometer parameters setting is influenced by process speed?
Response time is a changeable parameter which you can set via SD3000 application SW (screen “Parameters”, “Tau” –Average number).
Actually you can change it from 0.051sec to 10sec.
Default setting before shipping for specific applications : for example For Press – 0.51Sec, for billets – 0.102Sec.
If the process is not too fast, we set it maximal possible value, because with higher “Tau” instrument is performing more averages.
Another parameter affecting to reaction time – “Moving average”. When process is slow – we set it 6, for fast measurements – working without it (set 1).
|
| |
| Сканер PS3000 не движется |
We are having some problems with your PS 3000 scanner, it does not scan automatically, it goes in maximum position on one side, but wont go back.
Could you suggest me how to handle this, should I send it to you for repair.
When I press scan button it rotates to maximum position on one side, but does not go back, it stays in maximum position. We cann rotate it manualy and find the temperature,everything is working fine except that.
Please follow instruction at user manul chapter 3.5.3 (Scanning range instruction), it may that both left and right virtual limit are set to one point.
|
| |
| Inga Concept |
|
Pyrometer based on Si – means that this pyrometer has Photo detector build with Si, and filters are in the range of 900-1000 nm; Temperature range 450-3200°C.
Pyrometer based on InGaAs has InGaAs detector, working with filters in range of 1300-1600nm and temperature range 300-1000°C (or possible modification 500-1500°C).
Pyrometer with InGaAs Extended detector has filters in range of 2100-2600nm; temperature range 100-1000°C.
In order to give an answer regarding ability to measure temperature in any process we should have any process description, system sketch, layout etc
Because there are too many different accompanying conditions must be taken into consideration:
- Size of target;
- Working distance;
- Kind of object heating, source of heat;
- Surface optical properties behavior;
- Kind of base for deposition
|
| |
| Ingot Thermal difference |
|
1. Infrared pyrometer may measure temperature of the surface which is in field of view;
In case surface of metal is covered by some layer which has another temperature – it is not possible to measure the temperature below this layer.
2. Some dross or foam may appear on the surface of ingot, and this structure has completely different optical properties and due to lower thermal conductivity pyrometer read much lower temperature.
3. Pyrometer measure temperature at particular spot on the surface and it is enough that it will covered even partly by some thin layer for getting readout with error (see picture below).
4. The main condition for successful measurements – surface should be free and open. Thin oxidation layer on aluminium surface will not create problem.
|
| |
| Ingot surface temperature measurement |
|
There shouldn't be a problem in measuring flat surface and shrinkage cavity with same calibration setup.
Main property of our pyrometer allows to use it in industrial process is the ability of self-correction for emissivity changes.
As a sample please sees attached diagram of different extrusion profiles has been measured with the same calibration setup.
As you can see that the differences here are much more significant than in ingots surface.
The main condition – pyrometer should look on the measured surface and not on the dross/foam layer which has completely different temperature than AL and completely different optical properties.
|
| |
| Problems in measuring the temperature of melting aluminum |
|
Following problem may occur during the measurement of melting aluminum with noncontact pyrometer
a) It may measure temperature of slag which is completely different of metal.
b) Optical properties of slag are different from optical properties of molten aluminum surface, so the
pyrometer, being calibrated for aluminum will give wrong result on another object.
c) One more factor may affect the measurements –hot walls surrounding, flames etc. Even in case the AL
surface is clean, it has very high reflection and all hot surrounding may reflect from the surface and influence on
pyrometer reading.
Two wavelength pyrometer which is using special algorithm is suitable for measurement of temperature of melting aluminum.
Under heavy dust conditions in the furnace, our pyrometer may reduce 2% of temperature readout when transmittance of
intermediate will be changed 50%.
|
| |
| Err 3 error |
|
Our pyrometer has wide dynamic range of measured signals. It’s working with automatic gain level setting
in accordance with signal value. The message Err.3 means “Software is unable to set stable gain level“.
The reason of this problem may be any fast changing of external lightening on the measured surface. So user should
check the area of measurements is free from any strong light source
|
| |
| Error -96 in P2001 pyrometer |
|
Error 95-99 are memory check problem detected by old devices. It require standard upgrade of Software version 6.26
and repair of communication PCB.
|
| |
|
