Page 5-2
IsoAir 310P Aerosol Particle Sensor Operations Manual
Chapter 5 4-20 mA Output Option
Configuring 4-20 mA Output
4-20 mA Out Status Channel (Optional)
Only applicable if Option Board 1 is detected. All 4-20 mA outputs are set to 4 mA at
start-up.
Status output settings
04
Off/default/initialize
06
Idle/StartPump
08
PreSample
10
Tare
12
Sampling - Flow OK Laser OK
14
Sampling - Flow OK Laser Bad
16
Sampling - Flow Bad Laser OK
18
Sampling - Flow Bad Laser Bad
20
CapOff/FlowCalibrate
The Status output (representing flow and laser of the current sample) will be held-over
from the last sample to allow time for the "delayed" flow error indication to be
processed. This will prevent the status 4-20 mA value from jumping between Bad Flow
and Good Flow when the counter transitions from one sample to the next.
2 Channel Mode
The command "
set instrument 2ch
I
" will set the instrument into 2-channel mode if
I
=1, or put the instrument into its default 4-channel mode if not.
When in 2-channel mode:
• 4-20 mA outputs will be 2nd and 4th channels - fixed
• PMS TCP Interface will present 2nd and 4th channels only
• Serial output will present 2nd and 4th channels only
OPC and Modbus maps will retain the original mapping.
