RKI Instruments GX-2001 Bedienungsanleitung

1. Turning the GX-2001 ON

a. Press and hold the MODE/POWER button for one second to

turn the GX-2001 on.

b. The instrument will go through a brief warm up showing date,

time and battery power.

c. If the battery level is low or the battery icon is ﬂashing and

the unit’s buzzer sounds, recharge the GX-2001 before use.

2. Measuring Mode Screen

a. After warm-up, the GX-2001 will beep and begin to scroll

showing current O2, H2S, CO and HC gas readings.

b. To view a particular gas reading press the DISP button to

scroll to the gas of interest. Reading will be displayed for

about 15 seconds, then begin to scroll again.

c. If the readings are not displaying fresh air values, (0 for H2S,

CO, and HC, and 20.9 for oxygen), it is necessary to perform

a Demand Zero.

3. Performing a Demand Zero

a. Find a fresh-air environment free of toxic or combustible

gases and of normal oxygen content (20.9%).

b. Press and HOLD the AIR button for about three seconds.

The display will indicate “hold”. When “Adj” is displayed,

release the AIR button. The GX-2001 will set the fresh air

values, 0% LEL HC, 20.9% O2, 0.0 ppm H2S and 0 ppm CO.

4. Performing a Breath Test

a. Performing a breath test quickly tests the GX-2001 oxygen

sensor, audible, visual and vibratory alarms for proper

operation. Performing a breath test is not a substitute for

calibration or performing a bump test on all sensors.

b. Turn the GX-2001 ON and allow GX-2001 to warm up.

c. Perform a Demand Zero.

d. Cup hands over sensor opening and gently exhale over the

sensors for 10 - 15 seconds.

e. The oxygen sensor output will drop below the alarm point of

19.5% and activate alarms.

f. Press the MODE POWER button to reset alarms when the

oxygen reading rises above 19.5%.

Quick Reference Guide For Model GX-2001

Turn on and adjust the GX-2001 gas monitor in a known fresh air area.

Quick Reference Guide For Model GX-2001

5. Sensor Failure

a. If the GX-2001 experiences a sensor failure during start up,

the LCD will indicate FAIL in place of the gas reading for

the sensor that has failed. To continue operation press and

release the MODE POWER button to acknowledge the failure.

Gas readings for that sensor will be replaced by dashes.

b. It is necessary to replace sensor and calibrate before the

GX-2001 is used.

6. Displaying Peak Readings

a. With the GX-2001 in measuring mode, press the MODE/

POWER button once to put the GX-2001 in Peak Reading

Mode. A small peak (upside down for O2) symbol is

displayed in the lower left of the LCD.

b. Press the DISP button to cycle through the four target gases.

c. Peak readings with peak symbols are displayed on the LCD

and show the maximum exposure encountered for HC, CO

and H2S plus minimum and maximum exposure for O2

since the GX-2001 has been turned ON.

d. Peak readings are reset once the GX-2001 is turned OFF.

7. Displaying STEL and TWA Readings

a. The STEL stands for short-term exposure limit and shows

the average reading for H2S and CO during the last 15

minutes. TWA stands for time-weighted average and is the

average reading for the last 8 hours.

b. With the GX-2001 in Measuring Mode, press the DISP

button to select either H2S or CO then press the MODE

POWER button twice to display the STEL then once again to

display the TWA.

8. Turning the GX-2001 Off

a. Press and hold the MODE POWER button until the GX-2001

turns off.

9. Consult the operator’s manual for further information

PN 71-0127RK Rev A

RKI Instruments, Inc. 33248 Central Ave, Union City, CA 94587

Phone (510) 441-5656 • (800) 754-5165 • www.rkiinstruments.com

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