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Analog Input
Section 4
4.2 Analog Input
4.2.1 Programming the Analog Inputs
Channels 1 through 7 are analog input channels that can accept a signal from
an external device. This signal may range from -4.5 V dc (min.) to +4.5 V dc
(max.) or from 4 to 20 mA dc depending on the input selected. In some cases,
input signals from certain devices may also fall somewhere within those
ranges. For that reason, each analog input channel must be mapped to the
minimum and maximum signal limits of the external device.
To map an external device to an analog input channel:
Select an analog input channel (1, 2, and 3 are current inputs and 4 through 7
are voltage inputs).
1. Select
DATA LOG from the Advanced Options menu.
2. Highlight
SELECT INPUTS using the up and down arrow soft keys and then
press the
SELECT soft key.
Note: If logging is enabled on any
channel, that channel will have an
arrow in front of the channel name
to signify that the channel is logged.
3. Highlight the analog channel to log using the up and down arrow soft
keys, then press the
SELECT soft key.
4. Press the
CHANGE CHOICE soft key to cycle between “Logged” and “Not
Logged”, then press the
ACCEPT soft key.
5. Enter a Logging Interval.
6. Select Unit of measurement (pH, ft, °C, °F, mV, gal, m
3
, cf, ltr, in., m,
cm,%
02
, 5 H
2
S,%lel, V dc, cfh, ppm, ppb, afd, cfs, cfm, cfd, cms, cmm,
cmh, cmd, gps, gpm, gph, lps, lpm, lph, or mgd).
7. Enter Low Point.
8. Enter High Point.
9. Select another channel to configure, or press the
RETURN soft key to
back up one step, or press the
MAIN MENU function key to return to the
Main Menu.
Example:
A dissolved oxygen meter has an analog output signal that will connect to the
980 Flow Meter analog input channel 4. The DO meter puts out an analog
signal which ranges from +1 V dc to +3 V dc, which is equivalent to 0 to
500 ppm. The DO meter is connected to Channel 4 and logs readings from
the DO meter occur once per minute.
To configure data logging for this example, follow the steps below.
1. Select
DATA LOG from the Advanced Options menu.
2. Highlight
SELECT INPUTS using the up and down arrow soft keys and then
press the
SELECT soft key.
3. Highlight the analog channel to log (Channel 4) using the up and down
arrow soft keys, then press the
SELECT soft key.