YSI 6500 Environmental Process Monitor - Manual (Page 6)

YSI Incorporated 6500 Field Guide 6
SET AND CHECK RELAYS AND
4-20 CURRENT LOOPS
There are 4 relays resident in the 6500
for which parameter limits may be set.
From Main menu highlight Relays and
press Enter. Choose Configure Relays
in the next screen to display the Relay,
set, hys menu shown to the left. For each of the 4 relays press En-
ter to activate the next display which
allows you to assign parameter, con-
dition and set point. Note, hysteresis
(hys) or “dead band” allows you to
manage relay “chatter” at the set
point.
For each relay press Enter to activate
the setup screen. For example, Relay 1
is set to close if the temperature rises
above 18
o C. Use the left and right
arrow keys to move to other relays
and set additional conditions for additional parameters. The display
to the left shows all 4 relays set for 4
different parameters.
To test relays press Esc to view the
previous screen, then highlight Test
Relays and press Enter. As shown to the left when you highlight
and press Enter, the relay energizes
(you may hear the click) and the relay
icon begins spinning. In addition to
this local relay test, you should also
confirm that the relay signal is prop-
erly transmitted to the alarm or dialing device.
There are eight 4-20 mA current loop
channels resident in the 6500 to
which parameters may be assigned.
From Main menu highlight 4-20mA
and press Enter. Choose Configure
4-20mA in the next screen to display
the 4-20 channels.
Next highlight a particular channel
and press Enter, to view the setup
screen for that channel. See the example for Channel 1 shown to
the left. Choose the parameter by
highlighting Para, and then use the
arrow keys and Enter key to assign the
parameter. In a similar manner set the
4 and 20 mA levels for the low and
high temperatures.
Use the left/right arrow keys to assign
additional channels. Press Esc to view
a list of all 4-20 channels. See the
display to the left.
To test 4-20 mA current loop outputs return to the 4-20 menu using
Esc. Highlight Test 4-20 mA and press Enter. The values for each
channel represent what the sonde
sensors are reading based on the con-
figuration range that was assigned.
Alternatively, press Enter and then
use the arrow keys to enter a known
mA value, e.g., 12 mA. This should equal 15 o C based on the range
assigned. Check your SCADA or recorder for accurate conversion.