Turning Unit On And Off; Viewing And Changing Settings; User Id; Date And Time - 3M 740 Serie Instrucciones De Uso

Turning Unit On and Off

To turn the unit on, hold down the POWER/SELECT button for  seconds and watch the LCD display countdown (Fig. ). Release the button at the conclusion of the 
second countdown.
When turned on the unit will first perform a self-test – buzzer sounds, LEDs flash, vibrator actuates, LCD segments are turned on, firmware version is displayed and self-
test of sensors and electronics is performed. The unit will then go through a warm-up phase displaying a series of settings that can be changed or adjusted (see Viewing
and Changing Settings). At the end of the warm-up, the sensor readings are displayed along with the date and time. The unit is now ready for use.
If a self-test fails, the LCD will display "Err." Press button to clear. Do not use the detector until the reason for the "Err" message has been determined and corrected.
To turn the unit off, hold down the POWER/SELECT button for  seconds and watch the LCD display countdown (Fig. ). Release the button when the countdown is concluded.

Viewing and Changing Settings

All of the instruments' settings will be displayed as part of the warm-up sequence. Any of the settings can be changed during the warm-up sequence, after the unit is
turned on. It will first display the following information:
1. LCD test/alarm actuators test
. Battery type and firmware version
. Serial number
. Sensor pack status
The rest of the settings listed in this section will then be displayed in the order shown below. To change any of these settings, press the PEAKS/NO button while the setting
is being displayed. To skip any of the settings, press the POWER/SELECT button. Unless the password protection has been disabled, you will be required to enter the
password to make any changes (see Password Setting section).

User ID

The User ID can be set by pressing the PEAKS/NO button while the User ID is being displayed during warm-up (Fig. ). To skip this step, either press the POWER/SELECT
button or wait 5 seconds. Use the arrow buttons to change the highlighted digit and the POWER/SELECT button to advance to the next digit. If the password protection has
been set, you will be required to enter the password in order to change the User ID.

Date and Time

The date and time can be set by pressing the PEAKS/NO button while the Date and Time is being displayed during warm-up (Fig. 5). To skip this step, either press the
POWER/SELECT button or wait 5 seconds. Use the arrow buttons to adjust the highlighted portion of the Date and Time and the POWER/SELECT button to accept the
highlighted selection. If the password protection has been set, you will be required to enter the password in order to change the Date and Time.

Explosive Gas Selection

The Explosive Gas Type can be set by pressing the PEAKS/NO button while the Explosive Gas Type is being displayed during warm-up (Fig. 6). To skip this step, either press
the POWER/SELECT button or wait 5 seconds. The choices for Explosive Gas are: methane (% LEL), pentane (% LEL), hexane (% LEL) or methane (% VOL). Use the arrow
buttons to change the desired selection and the POWER/SELECT button to confirm the selection. If the password protection has been set, you will be required to enter the
password in order to change the Explosive Gas Type.
Fig. 

Turning On the Unit

Immediately exit any environment that causes an alarm condition on the monitor. Failure to do so may result in sickness or death.

Oxygen Low Alarm Set Point

The Oxygen Low Alarm Set Point can be set by pressing the PEAKS/NO button while the Oxygen Low Alarm Set Point is being displayed
during warm-up (Fig. 7). To skip this step, either press the POWER/SELECT button or wait 5 seconds. This sets the alarm point to trigger
an Oxygen Low Alarm if the oxygen reading drops below this point. To set the Oxygen Low Alarm Set Point, use the arrow buttons to
change the highlighted digit and use the POWER/SELECT button to advance to the next digit. The allowable range is from 5.0 % v/v
to 0.8 % v/v. If the password protection has been set, you will be required to enter the password in order to change the Oxygen Low
Alarm Set point.
Note: For personal exposures, OSHA considers any environment with oxygen levels below 19.5% to be oxygen deficient.
Fig. 

Turning Off the Unit

WARNING
Fig. 
User ID
8
Fig. 5
Date and Time Explosive Gas Selection
Oxygen Low Alarm set Point
Fig. 6
Fig. 7