Quest Products O2/LEL Manuel d'utilisateur télécharger pdf (Page 10)

Operation

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SafeCheck 200 Operator’s Manual

The other option in the DISPLAY OPTIONS menu is LEL. This allows

you to select the way that the gas reading from the LEL (Combustible)

sensor will be displayed. With LEL highlighted, pressing I/O will change

between % of LEL or % of CH

by volume. As % of LEL it will display as

a percentage of the Lower Explosive Limit from 0 to 100%. As % of CH

it will display as a percentage of the volume of CH

(methane) that is

present in the environment from 0.0 to 5.0%. Note: 5,0% by volume of

is also 100% LEL for CH

. Press the ▲ arrow key to return to the

setup menu.

• Password:

This menu item allows you to set or change your unit's password. The

password is necessary to enter the setup mode and change any of the unit's

setup parameters.

Use the ▼ arrow key to move through the setup menu until PASSWORD

is highlighted, then press I/O. Enter the new

password using the ▼ arrow key to change the

digits and the I/O key to set them. After the last

digit is entered, you will be asked to re-enter the

same password as a check. If they match, the display will show

PASSWORD ACCEPTED and then return to the setup menu. If the re-

entered password does not match the initial one, you will be asked to begin

again. Pressing the ▲ arrow key at any time will return to the main setup

menu.

3.4.4 Calibration:

This should be done for each installed sensor prior to entering your work

area. An uncalibrated unit can be as dangerous as no unit at all. Failure to

calibrate can result in inaccurate sensor readings.

From the main menu, press the I/O key while CAL. is highlighted The

following items, will be found in the CAL.

menu: INDIVIDUAL CAL, ALL CAL, and

SPAN ADJUST. Press the ▼ arrow key to cycle

through them. Press the I/O key to select the highlighted item.

Enter New

Password: ■---

Individual Cal

All Cal

Operation

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SafeCheck 200 Operator’s Manual

• Individual Cal: The unit first waits to do a CALIBRATION ZERO. This

is automatically done before any calibration to

adjust for drift in the sensor's sensitivity, which

occurs over time and after use.

Note

: Fresh uncontaminated air is necessary for the proper outcome of

this procedure. (Zero the unit away from heavy traffic, excessive

cigarette smoke, and industrial fumes.) If such an atmosphere is

difficult to reach, zero air cylinders are available.

Press the I/O key when you are sure that you are in a clean air environ-

ment. The unit goes through and automatically zeros all the installed sen-

sors.

The installed sensor list now appears in the top line of the display. The

second line gives you the date of the last cali-

bration for the highlighted sensor. Use the ▼

arrow key to scroll through the sensors. Press I/O

to access the highlighted gas calibration menu.

At this point the unit takes over and runs the calibration. On the display,

the unit asks you to apply the concentration of

calibration gas that was specified in Span

Adjust on page 19. The second line displays

the message "Waiting......" along with the current concentration.

Place the calibration cup over the unit's sensors on the SafeCheck 200.

Screw the regulator onto the calibration gas cylinder.

Connect tubing between the regulator on the gas cylinder and the calibra-

tion cup on the SafeCheck 200. Open the regulator as far as it will turn and

gas should begin flowing over the sensors. Once the level of gas begins to

rise, the second line of the display will change to "Detected" and the

number next to it will begin to rise. Once the rise in the gas level starts to

slow down and reach a stable level, the unit displays the message

"Stabilizing". When the unit determines that the gas level has stabilized

and no longer rising, the unit will do a calibration. It will display a mes-

sage "Calibrating" and if successful "Calibrated". If calibration is not suc-

cessful, the unit will indicate "Cal Failure". Check your calibration setup

and calibration gas and then attempt another calibration. If the unit still

cannot calibrate, either replace the sensor or have the unit serviced.

Calibration Zero

Ready? ■

O2 LEL

Apply O2 @ 20.9

Waiting …. 18.0

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Quest Products O2/LEL Manuel d'utilisateur Page 10

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