Operator`s manual

Page 17
FIELD OPTIONS AUTO ZERO
GENERAL: The BW DEFENDER sensors can be AUTO ZEROED without the use of
calibration gas. In a clean, normal environment free of background gases, initiate the
Calibration procedure (see page 23). All the sensors will be Auto Zeroed.
PASSWORD PROTECTION
GENERAL: Access (to calibration and alarm
setpoints) can be restricted by the user.
“KEY ICON”: The key icon will illuminate and
remain lit when Password is enabled.
1. Turn BW DEFENDER ON. Press and hold the key for 5 seconds. The unit will
beep 4 times, than the word “OFF” will display and the LCD will go blank.
2. DO NOT RELEASE THE KEY - CONTINUE holding button down for an
additional 30 seconds. During this time the BW DEFENDER will do nothing.
NOTE: After 30 seconds, the screen will light, the word “OFF” will appear and two
beeps will sound or
“000” will appear and the audible will beep once.
One Beep (“000”) - Change or Remove the Existing Password:
3. Enter your current 3-digit password with the UP/DOWN Arrow keys. Press
after each digit. If the password is incorrect, the LCD will display “NO” and exit the
password routine. If the unit beeps twice, continue as described below.
Two Beeps (“OFF”) - Enter a New Password: Do not use a password of “000” as
this is the OFF setting and it will disable password protection.
4. Enter your new 3-digit password with the UP/ DOWN Arrow keys. Press
after each digit.
5. The BW DEFENDER will beep three times. Enter the new password again to
verify it is correct. If the two entries match, 4 Beeps will verify BW DEFENDER is
locked. If they are different, the LCD will display “NO” and exit without setting the
password.
6. The calibration lockout is maintained until the password is reset to “000”.
OTHER ALARMS
GENERAL: In addition to the gas hazard alarms, the BW DEFENDER provides a
distinct alarm warning if the battery power is low, and to announce a missing sensor.
LOW BATTERY ALARM
Occurs when the battery voltage falls to a
point where the battery approximately
30 minutes of useful life remaining.
Audible: Low-pitched “chirp” every 7 sec.
LEDs: Blinks in sync with audible
ICONS: “ALARM” word blinks every 2 sec.
“LOW BATTERY” words blink in sync.
The low battery warning persists until the
battery recovers or, if the battery is in danger
of failure, the BW DEFENDER will execute
an Automatic Shutdown (see page 10).
Observe carefully to ensure the battery does
not fail without proper notification to the user.
Caution: Low Battery Alarm is replaced if the
Confidence Beep is activated. (See
“Confidence Beep”.)
MISSING SENSOR ALARM
Advises the detector is not intact and which
sensor is missing.
Twin Toxic Sensor: Activates a Multi-Gas
type alarm and the letters “SE” (Sensor) will
blink on both the CO and the H
2
S displays.
This also applies if the “dummy sensor” is
removed from the 2-gas version.
Combustible Sensor: Activates high alarm
audible and visuals and the letters
“Or” (overrange) blink on the EX display.
Oxygen Sensor: Activates low (Deficiency)
alarm and the numbers “0.0” blink on O
2
display.
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