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| 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: |
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| Measured Temperature Low |
| Please check for all possible interference between camera lens and spot measurement, A3000 pyrometers measurement spot center is parallel to laser pointer with 48 mm span and 25mm span for PS3000. |
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| Err 80” from display |
Technical question from our customer, sensor can't show the temperature and we got message “ Err 80” from display.
Please advise us why we got this message and how to solve this problem, thank you
This error is described in the "A3000 V1.5 item 4.1.4 No Calibration Indication".
1. First check if the sensor works with group No1. If it doesn't, switch to group No1 (see "SD3000_App_A" item 3.3 Camera Group Selection)
2. Switch the sensor to "Analytical" mode (see "SD3000_App_A" item 3.2 Camera Mode Switch)
We don't recommend using AE3000 (standard "press exit" application) in the "Discrete" mode.
Please, adjust DY analytical coefficients if needed. |
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| Temperature Too High |
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. |
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| Measured Temperature Too High |
Please avoid strong light illumination in the area of pyrometers' measurements.
When emissivity is 0.1-0.2, the reflectivity is 0.9 - 0.8. It means that we “mirror” surface and a lot of external light coming to pyrometer through the surface. And additional amount of energy influence to results of measurements. This influence could rise with emissivity dropping down.
Shielding measurement spot from all source of external light, (sun light and artificial light) will normally solve the problem |
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| Pyrometer Response time |
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).
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| PS 3000 scanner does not scan |
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.
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