96
6.2.5 Concentration Out Of Range
An out-of-range condition is indicated by the flashing
Over Range or
Under Range
. It means the sample concentration exceeds the range of the
programmed calibration. Make sure the test procedure is followed
correctly, dilute the sample (for over range samples) and rerun the test.
Each Hach test has an upper concentration value that defines the program
range. Measurements beyond that range are unreliable.
6.2.6 Low Battery
The instrument continuously monitors battery voltage. If the battery
voltage falls to a level indicating less than ten percent battery life remains,
the instrument automatically warns the operator at one minute intervals by
beeping and displaying the following message for two seconds, and then
returns the display to normal operation.
710 NM
LOW BATTERY
When the battery voltage falls below 7.2 volts, the instrument
automatically switches to the momentary mode to conserve battery life. If
the voltage measures less than 7.0 volts when the instrument is turned on,
the instrument beeps, displays
LOW BATTERY and turns off. Replace the
batteries, or, if a rechargeable battery is installed, recharge as soon as
possible (refer to section 4.1 Battery Installation).
Manually check the condition of the battery power source at any time by
pressing
SHIFT BATT. The battery voltage is displayed in the large digits
and a bar graph indication of the battery life is displayed in the text
section of the display.
For example:
710 nm
8.00 ========
indicates a battery voltage of 8.0 volts and a battery life indication bar
(running half the width of the 16-character section) indicates approximately
half its charge remains. The battery check display is momentary, and the
display showing when the
SHIFT BATT keys were pressed is restored.
6.3 Warning Displays
If the instrument encounters a problem with marginal offsets, fails to zero
or experiences other problems during operation, one or more of the
following messages may be displayed:
OFFSET
ZERO
INSTRUMENT
If this occurs, press ENTER to repeat the tests. If the repeat test fails, contact
Hach Service.
To Next Page
Loading...
