Specifications

BT-610 Manual Page 15 BT-610-9800 Rev A
4.3.5. Warnings / Errors
The BT-610 displays warning/error messages on the top line of the Operate Screen.
These messages alternate with the normal date/time 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. Recharge the battery
FLOW ERROR!
The sample flow rate is not within +/- 10% of the nominal 0.1 CFM
flow rate.
SENSOR ERROR! Particle sensor error.
4.4. Sample Related Functions
The following sub-sections cover BT-610 sample related functions.
4.4.1. 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 main menu.
4.4.2. Real-Time Output
BT-610 provides real-time output on the serial port at the end of each sample. The
format of the output is controlled by the Serial Output setting (Section 5.4).
4.4.3. Sample Mode
The sample mode controls single sample or continuous sampling. The Manual setting
configures the unit for a single sample. The Auto setting configures the unit for
continuous sampling.
4.4.4. Sample Time
The sample time determines the amount of time that counts are accumulated. The
length of the sample is user settable from 1 – 999 seconds and is discussed in section
5.2.2.
4.4.5. Hold Time
The hold time is used when the sample mode is set to auto (continuous 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 – 999 seconds and is discussed in
section 5.2.3.