Manual Chapter 5

9-16 System Maintenance and Troubleshooting
Charging the Sensor Heads with the Model 8211
Place the sensor heads over the posts so that the heads face outward as
shown in “Charging the Sensor Heads and Analyzer with Model 8211
Charger” on page 9-15. Heads can be charged individually or together.
For maximum safety, the battery charger has a “Pending” status LED,
which lights momentarily when the head is first placed on the charger. If a
battery is very low, or is out of a specific temperature range, it cannot be
safely charged. When this condition occurs the “Pending” indicator
remains light. While “Pending,” the charger is actually charging the bat-
teries at a very low rate. This brings the low battery into acceptable voltage
range. Once the battery temperature and voltage are suitable for charging,
the charger automatically begins trickle charging and the “Trickle” indi-
cator light turns on.
To fast charge or discharge the battery the “Fast” button or “Discharge”
button must be pressed. If the “Fast” button or “Discharge” button is
pressed while the battery voltage is too low or temperature is not suitable
for “Fast” or “Discharge” operation, the indicator light will flash on and off.
This response acknowledges the request but indicates that the charger
cannot follow the request at that time. Once voltage and temperature con-
ditions are suitable, the requested “Fast” or “Discharge” operation will
begin and the indicator light will change to a steady light.
Indicator Light Charging Status
Pending Waiting for safe voltage and
temperature
Discharge (steady) Batteries discharging
Discharge (flashing Discharge requested, waiting
for safe voltage or temperature
Fast (steady) Batteries in fast charge
Fast (flashing) Fast charge requested, waiting
for safe voltage or temperature
Trickle Batteries in trickle charge,
topping-off, or charge complete