Casella CEL Airborne particulate monitoring system - Manual (Page 51)

HB3256-03 Page 49
S
PECIFICATION
.
Concentration measurement ranges:
0-2000
µgm/m³ (resolution 1µgm/m³)
Concentration display averaging/updating interval:
1 second update.
Average over recording interval.
24 hour average.
1 hour average.
10 minute average.
Accuracy: Typically ±15% of reading following gravimetric calibration to given dust
composition.
Particle size range of maximum response: 0.1 to 10 µm.
Sampling flow rate: 16.7 litres/minute mass (or optional temperature corrected volumetric).
Logging Capacity: 32K internal memory providing a logging capacity of 13,650 readings which
may be expanded to over 170,000 readings when using the optional PCMCIA memory card.
Each reading represents a single data value ie; Date, Time, 24 hour average, Temperature etc.
One additional data point is used by the system as a marker for each set of data. For example
if 6 measurement parameters are to be recorded (7 readings used per record) and these are
being logged every 30 minutes, 13650/7= 1950 complete data sets over a period of 1950*10
minutes (13.5 days).
Logging interval: From 1 to 65535 minutes.
Real time and date data: Seconds, minutes, hours, day of month, month and year.
Clock accuracy: ±1 minute/month, or better.
Readout display: 2 line 16character L.C.D.
Backup battery: rechargeable lead acid, 6v nominal, 1.2Ah.
Digital output: RS232C, 9600 baud rate, 8 data bits, 1 stop bit, parity: none.