RKI Instruments GP-01 with self resetting alarms - Manual (Page 13)

Model GP-01 Operator’s Manual Start Up • 13
Start Up
This section explains how to start up the Model GP-01 and to get it ready
for operation.
CAUTION: Before each day’s usage sensitivity must be tested on a known
concentration of the combustible target gas, typically methane,
equivalent to 25 - 50% of full scale. Accuracy must be within -0 - +
20% of concentration. Accuracy may be corrected by following the
calibration instructions in the calibration section on p. 22.
Start-up Procedure
1. Press and hold the POWER/MODE button for three seconds to turn on
the Model GP-01.
For several seconds, all elements of the LCD display and the LCD
backlight turn on. The vibrator activates briefly, and it then shuts off. The
alarm lights flash on and the buzzer sounds, and then they both turn off.
2. The Model GP-01 then displays “HC” before displaying the battery
voltage. The buzzer sounds again after the battery voltage is displayed.
CAUTION: If the unit gives a low battery warning or dead battery alarm,
change the alkaline batteries or charge the Ni-cad battery pack
before using the unit.
3. The combustible sensor inside the Model GP-01 begins operating and
the concentration of the target gas is displayed on the LCD. The Model
GP-01 is now in Measuring Mode. The target gas is displayed as a
percentage of LEL (lower explosive limit). The LEL is the lowest
concentration of gas in air that will ignite upon contact with a source of
ignition (e.g., a spark). The backlight turns off after 20 seconds.
Performing a Fresh Air Adjustment
Before using the Model GP-01, set the fresh air reading. Performing this
adjustment ensures accurate gas readings in the monitoring environment.
1. Find a fresh air environment of normal oxygen content (20.9%) that is
free of toxic or combustible gasses.
2. With the unit on and in Measuring Mode, press and hold the AIR button.
The LCD displays “hold” prompting you to hold the AIR button.
3. Release the AIR button when the LDC displays “AdJ”. The unit will set
the reading to 0% LEL and return to Measuring Mode.