11
2.3.10 Battery Power
The instrument is powered by a Lithium Thionyl Chloride (Li/SOCl2) AA size battery which is
non-rechargeable. When operating under average conditions the instrument is expected to
have approximately 5 years of battery life; average conditions are considered to be a reed
switch input from a FLOMEC flowmeter with no outputs used. High input frequencies (~1kHz
and higher) from a turbine flowmeter will reduce battery life by around 20%, and operation of
a battery powered scaled pulse output will reduce battery life by approximately 50%. When
the NPN transistor is used for an alarm with infrequent operation the reduction of battery life
may be negligible.
A low battery is indicated by the battery symbol on the lower right hand side of the LCD;
illumination of this indicator shows that the battery should be replaced as soon as possible.
Generally the remaining battery life after low battery indication is several days however this is
not guaranteed. Replacement batteries are available from the instrument manufacturer or
they may be purchased independently by the user. For user replacement it is recommended
that one of the following batteries be used:
Use of a battery which is not a 3.6V Lithium Thionyl Chloride type will void the instrument
warranty.
2.3.11 External DC Power
External DC power may be connected to the instrument in the range of 12-30V DC; this will
activate the LCD backlight, the sensor supply, and will increase the update frequency of the
LCD. When external DC power is provided the instrument will no longer draw any power from
the battery – the battery will then only be used as a backup power source. With the battery in
backup mode the life is expected to be approximately 8-10years.
2.3.12 Sensor Supply
The instrument is equipped with a 12V regulated sensor supply terminal which is suitable for
powering hall-effect sensors in FLOMEC flowmeters. The sensor supply is only available when
the instrument is connected to an external 12-30V DC supply.
To Next Page
Loading...
