Zellweger Lumidor MicroMAX+, User And Maintenance Manual

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4. OPERATING INSTRUCTIONS
4.7 CLEARING MEMORY
Memory is automatically cleared after each calibration.
To clear memory manually:
1) Depress the MODE button repeatedly until “USER SETUP” is displayed.
2) Depress the ON/OFF button to enter the user setup mode.
3) Depress the MODE button 4 times until “CLEAR MEMORY” is displayed.
4) Depress the ON/OFF button once to simultaneously clear memory and return to
normal operating mode.
4.8 TURN OFF
To turn the Mi off, depress and hold the ON/OFF button, and instrument
will beep 4 times. After the fourth beep, release the button, and instrument will indicate
“POWER OFF” and automatically turn itself off.
If ON/OFF button is released during countdown, instrument will resume normal
operation.
5. CALIBRATION
5.1 CALIBRATION FREQUENCY
It is important to verify accuracy on a regular basis to guard against any unexpected loss
of sensitivity due to mechanical damage, immersion, aging, or exposure of the sensors to
poison (such as high concentration of combustible gas, tetra-ethel-lead, sulfides or silicone
containing lubricants) present in the atmosphere being monitored.
The safest possible course of action is to expose the sensors to a known concentration test
gas before each day’s use. This “bump” test takes only a few seconds to accomplish. It is
not necessary to make a calibration adjustment unless readings are off by more than 15%
of the applied gas concentration. If this procedure is followed, the calibration interval can
be up to 90 days.
If your calibration procedures do not permit daily checking of the sensors, Zellweger
Analytics recommends the following procedure to establish a safe and prudent check
schedule. Initially, over a period of a few days, check the response daily to be sure there is
nothing in your atmosphere that is poisoning the sensors. If the instrument displays correct
concentration levels after 2 weeks on this schedule, the calibration interval may be
extended to two weeks. If the instrument does not require calibration, after 2 months on
this schedule, the calibration interval may be extended to 30 days.
M U L T I G A S D E T E C T I O N
WARNING
This does not preclude testing with gas on a regular basis.
Always observe your employer’s calibration and testing schedules.