4210 Flow Meter
Section 2 Programming
2-13
The LEVEL READING INTERVAL option is a way to conserve
power in battery-powered installations. If your installation is
AC-powered, you can simply select CONTINUOUS.
The 4210 expends considerable power generating the
ultrasonic pulses.
With this unit, select the longest acceptable interval between
readings, if you are operating on battery power. If you need a
faster response time, select one of the shorter intervals. If you
are operating on battery power, you may have to seek a com-
promise between short reading intervals and battery life
expectancy.
Select VARIABLE BLANKING and the following will appear:
You can determine this distance approximately by measuring
from the face of the (installed) ultrasonic level sensor to the sur-
faces of the channel just above the maximum expected liquid
level. This value tells the flow meter to ignore any echo reflected
from this distance or less.
The purpose of this selection is to let you fine-tune the reflection
cone beneath the ultrasonic level sensor. If the level sensor is
mounted too high above the flow stream, there is a good chance
echoes will be reflected from the channel walls, tops, sides, or
other solid surfaces, that have nothing to do with the actual
liquid level. Proper selection of a value here will ensure that
echoes selected by the flow meter as valid will only come from the
surface of the flow stream, not the walls of the channel.
If you select DO/PH READING INTERVAL, the following will
appear:
Again, this selection is offered as a means of saving battery
power. After selecting the appropriate parameter reading
interval, press Enter.
This time, select YSI 600 READING INTERVAL from the menu.
The following display will appear:
YSI 600 READING INTERVAL refers to the YSI 600 Sonde. The
flow meter can measure several different aspects of the stream at
the same time, including pH, D.O., temperature, plus conduc-
tivity.
Note
If you are using the Isco D.O. sensor or are sensing D.O. with
the YSI 600 Sonde, select as long a measurement interval as
is practical for your application. The reasoning is that the D.O.
sensor is turned off between measurement intervals and this
turned-off period prolongs the life of the sensor.
VARIABLE BLANKING
DISTANCE = XX.XX FT (or meters)
DO/PH READING INTERVAL
•CONTINUOUS• •15 SEC• •30 SEC• •1 MIN• •2 MIN• •5 MIN•
YSI 600 READING INTERVAL
•CONTINUOUS••15 SEC••30 SEC••1 MIN••2 MIN••5 MIN•
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