4210 Flow Meter
Section 2 Programming
2-17
CAUTION
Each 4-20 mA output represents a constant drain on the flow
meter of at least 16 mA whether activated or not. While 4-20
mA applications are generally made in installations with com-
mercial power available, Isco suggests the following for those
who have a 4-20 mA output in a battery-powered installation.
Use with battery powered flow meters only:
• If the battery is continuously on charge (for example
with a Solar Panel Battery Charger)
• If the battery is very large, such as a deep-cycle or
marine type battery, or an Isco 35 Ampere-hour
lead-acid battery.
• Use only one 4 - 20 mA output.
• Keep in mind that programming choices also affect
power consumption. Use “minimum” settings on the flow
meter wherever possible. (See Section 1, Table 1-4.)
Even with these circumstances, you may expect significantly
shorter charge life from your battery. To determine the effect of
this extra current draw on battery life, please refer to the section
How to Make Battery Calculations, at the end of Section 1.
The following menus determine the behavior of the 4-20 mA
current outputs. If you select ANALOG OUTPUT (another name
for the 4-20 mA Output) and the flow meter is equipped with the
optional internal board or the 4-20 mA external accessory has
been turned on, RANGE, SMOOTHING, and MANUAL
CONTROL will appear:
Note
If you know for certain that you have the proper installed hard-
ware for internal 4-20 mA outputs and you do not see the
proper displays, return to the “normal” flow meter display and
press 4 - 2 - 0.
CAUTION
If you do not have the proper hardware installed and you press
4 - 2 - 0 and the number of analog outputs is not zero, the
external 4-20 mA converter will not work properly. If this
occurs, return to the 4 - 2 - 0 option, and at the prompt, enter 0
for the number of outputs activated. This will restore the exter-
nal 4-20 mA converter capability.
ANALOG OUTPUT
• EXTERNAL 4-20 MA • • (RANGE) • • (SMOOTHING) • •
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