4-10 Model 3772/3771 Condensation Particle Counter
Orifice Pressure
Orifice pressure is the differential pressure across the aerosol flow critical
orifice in kPa. Identification of the orifice is found in the flow schematic
Figure 5-1.
Nozzle Pressure
Nozzle pressure is the differential pressure across the nozzle between the
condenser and the optics chamber in kPa. Identification of the nozzle is
found in the flow schematic
Figure 5-1.
Laser Current
Laser power is monitored by an internal detector in the diode laser
package. If laser light energy drops and the laser current is below 35 mA,
an Error is indicated and the Status light is OFF.
Liquid Level
FULL is indicated if adequate butanol is present in the liquid reservoir.
Liquid level is detected by a heated RTD (Resistance Temperature
Detector) level detector. If the liquid level is low, NOT FULL is indicated.
Analog Inputs
Analog Input 1 and 2 display voltages supplied to the BNC connectors at
the back panel of the instrument. These analog data inputs have a range of
0 to 10 volts. Voltages can come from a variety of sources at the operator’s
discretion. Signals should be gained up or down so the outputs fall into the
0-to-B-volt window with maximum resolution. On both 3772 and 3771
CPCs, analog input data is saved along with concentration data through
firmware commands or to a computer running Aerosol Instrument
Manager
®
software. On the 3772 analog input data can also be saved to
the Flash Memory Card when a card is present and data logging is ON.
Flash Status (3772 only)
When a flash memory card is present, READY is indicated. When a flash
memory card is present and data logging is ON, LOGGING is indicated.
When there is not a flash memory card, REMOVED is indicated. See more
details below.
USB Status
When the USB port on the back panel of the 3772/3771 CPC is connected,
the status indicates CONNECTED. The status indicates DISCONNECTED
when there is no connection to the USB port.
To Next Page
Loading...
