Analytical Industries GPR-1900 Series Trace PPB Oxygen Analyzer - Manual (Page 18)

Advanced Instruments Inc.
18
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
>>>
MANUAL RANGE
25%
1%
1000 ppm
100 ppm
5. Advance the reverse shade cursor using the ARROW keys to highlight the desired MANUAL RANGE.
6. Press the ENTER key to select the highlighted menu option.
7. The following displays appears with the range selected and oxygen concentration of the sample gas:
MANUAL RANGE
25%
1%
1000 ppm
100 ppm
>>>
3.3
PPM
AUTO SAMPLING
100 PPM RANGE
24.5 C
LO1 2 PPM 10 PPM HI2
8. The display will not shift automatically. Instead, when the oxygen reading (actually the sensor’s signal output) exceeds
110% of the upper limit of the current range an OVER RANGE warning will be displayed.
9. Once the OVER RANGE warning appears the user must advance the analyzer to the next higher range via the menu and
keypad Press MENU, select MANUAL SAMPLING, press ENTER, select the appropriate MANUAL RANGE and press ENTER
again.
Alarms
The CONFIG ALARMS features a system that can be configured in the field. Two field adjustable alarm relays with dry contacts
operate independently of one another which means the alarms can be set-up as:
¾ HI and LO
¾ LO and LO, LO,
¾ HI and HI,HI
Additional feature includes delaying the activation of the local audible alarm and relay contacts for up 99 minutes to enable
users to distinguish between transient occurrences and true upset conditions which is particularly useful on remote applications
without affecting the 4-20mA signal output. The local audible alarm can be silenced or disabled as well without affecting the 4-
20mA signal output.
Note: A separate feature, BYPASS ALARMS described below, enables the user to disable the local audible alarm and relay
contacts during calibration or servicing. The alarms are enabled when the alarm condition is corrected.
Set Alarm Values:
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CONFIG ALARMS.
3. Press the ENTER key to select the highlighted menu option.
4. The following displays appears: