ENMET OMNI-4000 - Manual (Page 34)

ENMET Corporation OMNI-4000 S/N 6705 and above
28
2.6 Turning the OMNI-4000 Off
To turn the OMNI-4000 off, press the ON/OFF switch for three seconds. The display shows the countdown as
follows before turning off:
Example of Display countdown:
When the device is turned off, the stored values (sensor setting values, alarm thresholds, histograms, etc.) are not lost.
The data can be stored for between 3 and 5 years, depending on the life of the lithium battery.
When the device is returned from the field, the batteries may be recharged and the exposure histograms printed, as
explained below.
2.7 Recharging the Battery
The following applies to both the standard OMNI-4000 instrument and the OMNI-4000 with the
BP-4000 pump. See section 4, table 4-2 for expected battery life.
The battery can be charged either while attached to or removed from the instrument. To remove the battery pack,
release the captive screw; see figure 2-20. Push the pack out; it slides toward the circuit board side, opposite the gas
sensor openings.
Two different chargers are available. One is a standard single rate charger; the other is a dual rate charger.
To charge with the standard single rate charger:
ƒ Plug the charger into 110 V AC .
ƒ Plug the charger into the battery pack. The connectors are polarized.
ƒ The red charge indication lamp lights.
ƒ Leave the battery on charge for 12-14 hours. Never charge longer than 72 hours with the standard charger
Fully charged instruments without BRH Smart blocks should not be left idle longer than one months without recharge;
those with BRH Smart blocks should be recharged every week when not in use, when using the standard charger.
C AUTION : Failure to do so can damage the battery pack
To charge with the dual rate charger:
ƒ Plug the charger into 110 V AC .
ƒ Plug the charger into the battery pack. The connectors are polarized.
ƒ There is a pre-charge interval of from 3 - 23 minutes; the battery is trickle charged while the charger
microprocessor acquires and evaluates the battery. During this time the green charge light is on and may flash.
ƒ The battery is then charged at full rate for 5 to 6 hours
ƒ When the battery is fully charged, the green light flashes. The battery is ready for use.
ƒ Leave the battery on charge when not in use. The green light is on and flashing, indicating a periodic trickle
charge.
When an instrument battery is discharged to the low battery alarm point, discontinue use and charge the battery as
soon as possible. When the instrument is idle for a period, continuously charge the battery with the dual rate charger.
The battery is periodically trickle charged to compensate for leakage and passive use. This is particularly important
with instruments which have BRH Smartblocks aboard.
When a battery is discharged to the low battery condition or beyond, the dual rate charger microprocessor may have
difficulty acquiring the battery, and the full rate charge cycle is not initiated. In this case, the charger indicates a false
full charge, with the green light continuing to flash. After the 23 minute maximum acquisition time, disconnect the
charger from the battery for a minute and then reconnect it.
OFF
HOLD for 3 sec 3
OFF
HOLD for 3 sec 2
OFF
HOLD for 3 sec 1