13
BATTERY LIFE
The battery life will vary from unit to unit because of different battery types, different ambient tempera-
tures and different applications. The battery change guide below will help you to determine when to
change the batteries until you gain experience in using your flowmeter in your application.
Battery Change Guide
The hours shown in the battery life table are estimates based upon a continuous ON at an ambient
temperature of 72° F (22° C).
Typically the flowmeter is not continuously on and the ambient temperature varies from application to
application. The effect this will have on battery life is as follows.
• Alkaline-battery life will be increased by as much as 30% when cycled on and off.
• At 32° F (0° C) alkaline-battery life will be reduced by 20%.
• At 110° F (40° C) alkaline-battery life is increased by 10%.
Comment:
The power-in-signal-out option is required for charging the NiCad batteries in the battery
compartment. See Caution on Page 14 before using NiCad batteries.
Self Discharge in Storage
Alkaline batteries will lose approximately 5% to 10% of their charge per year. NiCad batteries will lose
about 1% to 2% of their charge per day. Therefore, NiCad batteries should be charged shortly before
use.
Low Battery Flag
A low battery flag is displayed when the battery voltage drops below a certain value. The amount of
time the batteries will last after the flag is displayed can vary from an hour (alkaline) to 15 minutes
(NiCad batteries). The unit will shut itself off if the voltage drops too low.
BATTERY TYPE HOURS OF CONTINUOUS ON
Alkaline 25 - 30
Carbon Zinc 5 (Not Recommended)
NiCad* 10 - 15 (Per Charge)
* Sanyo KR4400-D
Battery Life Table
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