GT-324 Manual
Page 11
GT-324-9800 Rev B
A sensor error is reported when the GT-324 detects a failure in the optical sensor.
Figure 9 shows a sensor error.
0.5u 6,735 CF
Sensor Error!
Figure 9
–Sensor Error
4.3.
Sampling
The following sub-sections cover sample related functions.
4.3.1. Starting/Stopping
Press the START/STOP key to start or stop a sample from the Sample Screen.
Depending on the sample mode, the unit will either run a single sample or continuous
samples. Sample modes are discussed in Section 4.3.2.
4.3.2. Sample Mode
The sample mode controls single or continuous sampling. The Manual setting
configures the unit for a single sample. The Continuous setting configures the unit for
nonstop sampling.
4.3.3. Count Units
The GT-324 supports total counts (TC), particles per cubic foot (CF), particles per cubic
meter (M3) and particles per liter (/L). Concentration values (CF, /L, M3) are time
dependent. These values may fluctuate early in the sample; however, after several
seconds the measurement will stabilize. Longer samples (e.g. 60 seconds) will improve
concentration measurement accuracy.
4.3.4. Sample Time
Sample time determines the sample duration. Sample time is user settable from 3 to 60
seconds and is discussed in Sample Timing below.
4.3.5. Sample Timing
The following figures depict the sample timing sequence for both manual and
continuous sampling. Figure 10 shows the timing for manual sample mode. Figure 11
shows the timing for continuous sample mode. The Start section includes a 3 second
purge time.
Start
Stop
Sample Time
Figure 10
– Manual Sample Mode
Start
Stop
Sample Time
Sample Time
//
Figure 11
– Continuous Sample Mode
