Quest Products O2/LEL Uživatelský manuál stáhnout pdf (Strana 7)

Operation

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SafeCheck 200 Operator’s Manual

3. OPERATION

3.1 Turning the Unit ON:

Press the I/O key once to turn on the unit. The unit will then go through an

internal self test and startup routine. During this startup routine the back-

light will illuminate, the LED alarm light will turn on and the audible

alarm will sound. Your unit will determine which sensors are installed,

what their current alarm levels are, and the current battery pack voltage.

After the initialization screens, the main menu automatically appears. The

first highlighted item is ZERO. At this time

you can zero the umt's sensors by simply

pressing the I/O key. We recommend that

you zero the unit at this time

provided that

you are in a non-hazardous clean-air environment. To reduce the

chances of the unit being zeroed in a contaminated environment, only

small automatic adjustments are allowed in this main menu ZERO func-

tion. If the adjustments necessary to zero the sensors are more than the unit

will allow, a message will appear indicating which sensor or sensors

cannot be zeroed followed by a "Zero Failure" message. In this case, the

instrument must be zeroed under the Cal. main menu function. If no main

menu selections are made, the unit automatically will go into the RUN

mode after 30 seconds.

If you turn the unit ON and there are no sensors in place, the unit will not

go into any of the modes that depend on sensors being there (e.g. RUN,

ZERO, or CAL).

3.2 Turning the Unit OFF:

To turn the unit OFF, the unit must be in the main menu. If in the run

mode, exit to the main menu by closing the session. Refer to Section 3.4.1

Run on page 11. Then press and hold down the I/O key. The screen will

display a three second countdown and will beep once per second. When

the screen goes blank and the alarm is on steady, you may release the key.

The unit is now OFF.

3.3 User Modes:

The SafeCheck 200 has two modes: BASIC and PASS/FAIL.

Run Setup

Zero

Cal.

Operation

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SafeCheck 200 Operator’s Manual

You may change your unit's mode at any time while it is in the RUN

mode. To do so, simply press the up arrow key located above the belt clip.

The screen provides you with three options. Pressing the I/O key changes

the unit to the next user mode. Repeat this process until the unit is set for

the desired user mode.

3.3.1 Basic Mode:

In this mode, the screen displays which sensors are installed in your unit.

Under each sensor indicator, its current level is displayed in percentage.

When a gas level reaches or exceeds an alarm level, the alarm light will

flash, the buzzer will sound, and the display will revert to displaying the

reason for the alarm (High or Low). The gas that caused the alarm will

alternately display the value of the gas and "*AL*".

By pressing the I/O key during this mode, you may switch to an additional

screen that displays the unit's battery voltage.

3.3.2 Pass/Fail Mode:

In this mode, the screen displays which gas sensors are installed in your

unit. The word PASS is displayed if none of the alarm levels have been

exceeded. When a gas level reaches or exceeds an alarm level, the alarm

light will flash, the buzzer will sound, and the display will revert to dis-

playing the reason for the alarm (High or Low). It also shows a numerical

display of the gases in percentage and the gas that caused the alarm will

alternately display the value of the gas and "*AL*".

By pressing the I/O key during this mode, you may switch to an additional

screen that displays the unit's battery voltage.

3.4 Main Menu:

When you turn on the unit, the main menu appears on the screen after the

SafeCheck 200 completes its power-up sequence. You may return to this

menu anytime when in RUN by holding down the I/O key for three

seconds. The unit displays a message "Session Stop In x Seconds" with a

countdown. After these three seconds, the unit will display a message

"Session Closing..." You can release the I/O key and when the session

finishes closing, the unit will be in the Main Menu. The item which

appears with a blinking cursor on the first character will be referred to as

the highlighted item (it is underlined in this manual).

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Quest Products O2/LEL Uživatelský manuál Strana 7

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