Analytical Industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter - Manual (Page 22)

Advanced Instruments, Inc
22
Main Menu
To access the MAIN MENU, press the MENU (ESC) key and the following screen will appear.
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
This screen shows various options available. You can use the UP and DOWN arrow key to move the cursor
and highlight the desired function. After moving the cursor to the desired function, press ENTER to access
that function.
Range Selection
The GPR-1800 IS transmitter is equipped with four (5) standard measuring ranges (see specification) and
provides users with a choice of sampling modes. By accessing the MAIN MENU, users may select either the
AUTO SAMPLING (ranging) or MANUAL SAMPLING (to lock on a single range) mode.
Note: For calibration purposes, use of the AUTO SAMPLE mode is recommended. For example, calibration
with ambient air (20.9% oxygen), the analyzer will automatically turn into 0-25% range. However, the user
can also select the MANUAL SAMPLE mode for calibration but the span gas must not exceed the full scale
of the manual range selected – for example, a span gas with an 8% oxygen concentration in nitrogen would
dictate the use of the 0-10% full scale range for calibration.
Auto Sampling
Access the MAIN MENU by pressing the MENU key.
Advance the reverse shade cursor using the ARROW keys to highlight AUTO SAMPLE.
Press the ENTER key to select the highlighted menu option.
The display returns to the sampling mode:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
0.3 %
AUTO SAMPLING
1% RANGE
76 F 100 KPA
The display will shift to the next higher range when the oxygen reading exceeds 99.9% of the upper limit of
the current range. The display will shift to the next lower range when the oxygen reading drops to 85% of the
next lower range.