GT-521S Manual Rev D
Page 11
4.2.4. Warning / Error Messages
The GT-521S displays warning/error messages on the top line of the Operate Screen.
These messages alternate with the normal header. The following table lists the
warning/error messages:
Display Message
Description
<COUNT ALARM>
Count alarm. The count is
the alarm limit.
LOW BATTERY!
Low battery warning. Less than 15 minutes of normal operation remaining.
SENSOR ERROR!
Particle sensor error.
4.3.
Sample Related Functions
The following sub-sections cover sample related functions.
4.3.1. Starting/Stopping
To start or stop a sample, press the START/STOP key. A sample event can be
manually started or stopped from either the Operate Screen or the menu.
4.3.2. Real-Time Serial Output
GT-521S provides real-time output on the serial port at the end of each sample. The
format of the output is controlled by the report type setting (section 5.8.1).
4.3.3. Samples
The Samples setting controls the number of samples to take. Repeat configures the unit
for continuous sampling. Single configures the unit for a single sample. 2-999
configures the unit for a number of samples. Samples are discussed in section 5.2.
4.3.4. Sample Time
The sample time determines the amount of time that counts are accumulated. The
length of the sample is user settable from 1
– 9999 seconds and is discussed in section
4.3.5. Hold Time
The hold time is used when Samples is set for more than one sample. The hold time
represents the time from the completion of the last sample to the start of the next
sample. The hold time is user settable from 0
– 9999 seconds and is discussed in
section 5.2.
