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Alphasense OPC-R1 User Manual

Optical particle counter
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072-0500
1
Quick Start
2
Product Specification
3
Health and Safety and Regulatory Information
4
How the OPC-R1 works
5
PM Measurement
6
Sampling the environment
Connecting and running the OPC
7
Connecting Power and Taking Readings
8
Running the OPC-R1 using the Alphasense software
·
Installation
· Data Display and taking measurements
· Other software functions
9
Running the OPC-R1 using direct API control
10
Revision Control
11
Appendices
A.
FAQs
B.
Installing the device driver
C.
Updating Firmware
D.
Summary of firmware commands
E.
Checksum
Alphasense Ltd
Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. Essex.CM77 7AA. UK
Alphasense User Manual
OPC-R1 Optical Particle Counter
Contents
Windows XP
Windows 7
Windows 8, 8.1 and 10
Page 1 of 33
Tel: +44 (0) 1376 556700
Email: sensors@alphasense.com
February 2019
- Fax: +44 (0) 1376 335899
- Web: www.alphasense.com
Issue 1

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Summary of Contents for Alphasense OPC-R1

  • Page 1 How the OPC-R1 works PM Measurement Sampling the environment Connecting and running the OPC Connecting Power and Taking Readings Running the OPC-R1 using the Alphasense software · Installation · Data Display and taking measurements · Other software functions Running the OPC-R1 using direct API control...
  • Page 2 072-0500 OPC-R1 Optical Particle Counter Issue 1 Quick Start The purpose of this manual is to explain how to set up, install and use the Alphasense Optical Particle Counter OPC-R1 for measuring PM , PM and PM , as well as measuring particle size distributions in real time.
  • Page 3 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 OPC-R1 Specification All dimensions in millimetres (± 0.15 mm) MEASUREMENT Particle range 0.35 to 12.4 (mm) Spherical equivalent size (based on RI of 1.5+i0) Size categorisation (standard) Number of software bins...
  • Page 4 The OPC-R1 uses an embedded diode laser operating at 4-8 mW (max. 11 mW) at a wavelength of 639 nm. The OPC-R1 is a Class 1 laser product, since the user does not have access to the laser source. The OPC-R1 is designed for OEM use, normally mounted in a secondary housing. The user must not open or adjust any parts of the OPC-R1.
  • Page 5 639 nm. The OPC-R1 assumes an average RI value of 1.5 + i0. The OPC-R1 allows a different value to be set for each size bin to correct for particle density variation with particle size. The OPC-R1 has 10 bin weighting indexes, one is adjustable by the end user and 9 are factory set.
  • Page 6 SPI socket. Firmware updates use the SPI connector. Connection to the OPC-R1 for real-time data transfer can be made via the SPI direct to your own circuit’s internal bus using your own or the SPI interface provided by Alphasense. The SPI interface supplied by Alphasense requires a USB A-B lead to connect to the USB port of a computer, this must be ordered separately.
  • Page 7 Connect the USB-SPI interface lead and OPC device to the PC. If you are prompted for device drivers refer to the previous section of the user manual. Double click the OPC-R1.exe icon to start the software application. When the application is first started the main form will be in “start-up mode”...
  • Page 8 Histogram Counts/s vs Particle Size display mode When the Start sampling button is pressed, the OPC-R1 will first ask if the data are to be saved. Once answered, it will begin to display particle size histogram data and if selected it will store data to a specified file.
  • Page 9 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 · Data relating to each acquired histogram, including PM values, is given in the right-hand window of the display. The RollMean_PM10, etc., are the current rolling mean values for PM evaluated over the previous 5 minutes or to the beginning of sampling if that is less time.
  • Page 10 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Histogram Number Concentration vs Particle Size display mode Click the ‘Histogram #/ml’ button on the left-hand side of the screen to show the recorded data in particle number concentration (particles per millilitre of sampled air) format, as below: History Plot of Counts/s display mode Click the ‘History plot #/s’...
  • Page 11 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 History Plot of Mass Concentration display mode Click the ‘Histogram plot mass conc.’ Button on the left-hand side of the screen to show a temporal record of PM , PM and PM values (in µg/m...
  • Page 12 PM values. Please note 4.25 only 3 values in total can be reported. To carry this out connect the OPC-R1 to the Alphasense software as usual. Then: 1. Type Ctrl + R: Read and display all configuration variables. This will display the variables available to the user for edit.
  • Page 13 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Alphasense Ltd Page 13 of 33 February 2019 Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. Essex.CM77 7AA. UK Tel: +44 (0) 1376 556700 - Fax: +44 (0) 1376 335899 Email: sensors@alphasense.com...
  • Page 14 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Explanation of the CSVs (Please note sheets are truncated to save space) Comment Software ver: OPC-R1 Alphasense 1.0.6473.16786 Device SerNo SerNo: 178390116 Unit serial number InfoString OPC-R1 Firm ware version FirmwareVer=2.21........BS...
  • Page 15 Running the OPC R1 using direct SPI control Full details of the SPI commands and connections are available for the OPC-R1. This is should be sufficient for the user to be able to design their own SPI system to control the device and gather data.
  • Page 16 · Raspberry Pi and Arduino · The OPC-R1 is ideally suited to be operated by devices such as Raspberry Pi or Arduino via its SPI interface. While Alphasense does not distribute OPC-R1 control programs to be used on these devices, many of its customers have successfully implemented such control programs following the OPC-R1 SPI commands list.
  • Page 17 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Appendix B: Installing the device driver (drivers unchanged from OPC- Windows XP Copy the folder “OPC Interface Software” to the PC desktop. Connect the USB interface lead to the PC. If the USB interface lead (USB to SPI...
  • Page 18 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Windows 7 Copy the folder “OPC Interface Software” to the PC desktop. Connect the USB interface lead to the PC. If the USB interface lead (USB to SPI converter) is connected to the PC for the first time, Windows will need a device driver.
  • Page 19 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Right click the icon and select “Update Driver Software”. Select the “Browse my computer for driver software” option. Navigate to the folder “OPC Interface Software” copied to your desktop and locate the folder named “USB Driver”, Click Next.
  • Page 20 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Windows 7 will then issue a security warning. This is due to a licence issue and not a concern to the operating system. Select the “Install this driver software anyway” option.
  • Page 21 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Windows 8, 8.1 and 10 This procedure will guide you through the process of disabling the digital device driver verification in Windows 8, 8.1 and 10. The method for 8.0 is different than for 8.1 and 10.
  • Page 22 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Then click on the Recovery option on the left hand side. Once selected, you will see an advanced startup section appear on the right hand side. You will need to click on the “Restart now”...
  • Page 23 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Then Startup Settings. Since we are modifying boot time configuration settings, you will need to restart your Computer one last time. Finally, you will be given a list of startup settings that you can change.
  • Page 24 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 To disable the signature verification it is necessary to get into Troubleshooting options from the boot manager. Select Restart from the power options menu (for Windows 8 this is under Charms on the login screen and on Windows 10 this is on the start Menu.
  • Page 25 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Since we are modifying boot time configuration settings, you will need to restart your Computer one last time. Finally, you will be given a list of startup settings that you can change.
  • Page 26 Please note the method is different than with the OPC-N2. Please record the laser setting and ToF to SFR factor before updating the firmware as this may be reset to default, once updated. To upgrade the firmware on your OPC-R1 device requires: ·...
  • Page 27 EEPROM configuration. Appendix D: Summary of firmware commands OPC-R1 SPI functions (from point of view of SPI Master system) for firmware versions 2.01-2.21. Function Command Byte(s) out Byte(s) in (0xF3 is set as...
  • Page 28 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Read information 0x3F 0x3F 0x31 Suggest that 10 ms be used as string delay between command byte and following byte. 0x3F 0xF3 0x3F InfoStr ascii char00: "O" (=0x4F) SerialStr is a string of 60 characters.
  • Page 29 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Write serial 0x11 0x11 0x31 Suggest that 10 ms be used as number string delay between command byte and following byte. 0x11 0xF3 SerialStr ascii char00 0x11 SerialStr is a string of 60 characters.
  • Page 30 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 0x30 Sample Flow Rate Byte0 'Sample Flow Rate' is a float variable occupying 4 bytes that represents the sample flow rate in ml/s. 0x30 Sample Flow Rate Byte1 0x30 Sample Flow Rate Byte2...
  • Page 31 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 0x32 0xF3 0x32 PM_A Byte0 PM_A is a float variable occupying 4 bytes. Units are ug/m3. 0x32 PM_A Byte1 0x32 PM_A Byte2 0x32 PM_A Byte3 0x32 PM_B Byte0 PM_B is a float variable occupying 4 bytes.
  • Page 32 The command byte value must remain consistent with the original command byte value sent for the command to be validated by the OPC-R1. If it is not, the OPC-R1 will load the SPI buffer with 0x31 (busy) value and return to its normal mode of operation. THE SAMPLING TRIGGER WILL NOT BE ARMED IF THIS OCCURS.
  • Page 33 Alphasense User Manual 072-0500 OPC-R1 Optical Particle Counter Issue 1 Appendix E Checksum A 16-bit CRC checksum is transmitted after each histogram data set, which can be used, if desired, to verify the data sent. If the OPC is configured to only transmit PM data, a checksum will still accompany this data.