RKI Instruments GX-86 - Manual (Page 10)

6 • Operation Model GX-86 Instruction Manual
Normal Operation
The GX-86 continuously monitors the atmosphere and displays the LEL, O
2
, H
2
S, and CO
concentrations present. If the GX-86 is taken into a low-light environment, the display
backlight automatically turns on.
Displaying battery voltage
Press the BATT button. A single tone sounds and the battery voltage displays. New
alkaline batteries will register approximately 3.0V; freshly recharged Ni-Cd batteries will
register approximately 2.7V. The minimum voltage required for the GX-86 is 2.3V.
NOTE: The GX-86 automatically checks battery voltage during start-up. If the
measurement is below 2.3V, the GX-86 will not operate.
During normal operation, when the battery voltage drops to 2.3V, the letter B
flashes on the display to indicate a low battery warning. When the voltage
reaches 2.1V, all four LEDs turn on, a continuous alarm tone sounds, and
LOW BATT displays.
WARNING: The GX-86 does not monitor the atmosphere during the low battery alarm.
When the B indicator flashes on the display, take the GX-86 to a non-
hazardous location to change the batteries. (See Maintenance-Batteries.)
Displaying toxic gas (H
2
S and CO) exposure
Press the DOSE button. A single tone sounds and the GX-86 displays AVG XX M XX XXX .
This display indicates the duration of the measurement in minutes ( XX M ), and the H
2
S
and CO average exposure during that time. The GX-86 returns to normal operation after
five seconds. The duration of the measurement is the time elapsed since the last time the
GX-86 was turned on.
Displaying peak readings
Press the PEAK button. A single tone sounds and the letter P and readings for all four
gases display. The readings are the highest (lowest for O
2
) concentrations detected since
the GX-86 was turned on.
The GX-86 displays the peak readings for five seconds then returns to normal operation.
Peak readings stay in the GX-86’s memory until a higher level is detected or the GX-86 is
turned off.
NOTE: The BATT (battery voltage) and DOSE (toxic exposure) functions do not work
while the GX-86 is in the PEAK display condition.
Auto zero/span
To automatically adjust the zero point for combustibles, H
2
S, and CO, and the span for
oxygen, take the GX-86 to a known fresh air environment. With the GX-86 in normal
operation, press and hold the BATT/AIR and PEAK/AIR buttons at the same time until a
double tone sounds. The GX-86 displays
AUTO ZERO/SPAN , which indicates the GX-86 is
adjusting the detection circuits based upon the fresh air reading. When AUTO ZERO/
SPAN displays, release the BATT/AIR and PEAK/AIR buttons.