Alphasense OPC-R1 - Page 30

072-0500 Alphasense User Manual
OPC-R1 Optical Particle Counter Issue 1
Alphasense Ltd Page 30 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 - Web: www.alphasense.com
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
0x30 Sample Flow Rate Byte3
0x30 Temperature Byte0 Temperature is unsigned 16bit
integer.
0x30 Temperature Byte1
0x30 Relative humidity Byte0 Relative humidity is unsigned 16bit
integer.
0x30 Relative humidity Byte1
0x30 Sampling Period Byte0 Sampling Period' is a float variable
occupying 4 bytes and is a
0x30 Sampling Period Byte1 measure of the histogram's actual
sampling period in seconds.
0x30 Sampling Period Byte2
0x30 Sampling Period Byte3
0x30 Reject count Glitch 'Reject count Glitch' is unsigned 8bit
integer.
0x30 Reject count Long 'Reject count Long' is unsigned 8bit
integer.
0x30 PM_A Byte0
PM_A is a float variable occupying 4
bytes. Units are ug/m3.
0x30 PM_A Byte1
0x30 PM_A Byte2
0x30 PM_A Byte3
0x30 PM_B Byte0 PM_B is a float
variable occupying 4
bytes. Units are ug/m3.
0x30 PM_B Byte1
0x30 PM_B Byte2
0x30 PM_B Byte3
0x30 PM_C Byte0
PM_C is a float variable occupying 4
bytes. Units are ug/m3.
0x30 PM_C Byte1
0x30 PM_C Byte2
0x30 PM_C Byte3
0x30 Checksum Byte0 Checksum is unsigned 16bit integer.
0x30 Checksum Byte1
Read PM data (and
reset histogram)
0x32
0x32 0x31 Suggest that 10 ms be used as
delay between command byte and
following byte.