Maintenance Menus - Hach CL17 Instrument Manual

2.7.3.1 Changing to 0 to 20 mA Output Range

2.7.4 Maintenance Menus

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Alternatively, the output can be bracketed between 2–4 mg/L to control
chemical feeds, or the signal can be inverted by assigning a higher mg/L
reading for REC LO and a lower mg/L reading to REC HI.
Initially, select an output span that will cover the expected range of chlorine
concentration in the sample. Determine the correct minimum and maximum
values by monitoring chlorine values in your sample over time. Adjust the
minimum and maximum values if necessary, to obtain the best span for your
specific application.
Adjust the recorder output minimum and maximum values using the analyzer
keypad as follows:
1. Press the key.
MENU
2. Use the
DOWN ARROW
The display will show
key again to move to
ARROW
3. Press to change the displayed mg/L reading for
ENTER
. The digit to be changed will flash.
REC HI
4. Press the keys to change the digit or move to another digit.
ARROW
Appropriate values and selections are shown below. When the value is
correct, press
ENTER
• REC LO—0.0 mg/L to 5.0 mg/L limits.
• REC HI— 0.0 mg/L to 5.0 mg/L limits.
• ON SYSTEM ALARM—Select minimum, maximum, or hold to define
the recorder output when a system alarm is initiated.
5. Press to return to the main menu. Press
EXIT
normal operation.
Set the lower end of the output range to 0 mA instead of 4 mA as follows:
1. Press the key then use the
MENU
menu. Press .
ENTER
2. Use the
DOWN ARROW
Note: A large number may be displayed for the minimum value, this number refers to
counts, not milliamps. Proceed with step 4.
3. Use the keys to adjust the displayed value to 0. Press
ARROW
accept the value.
4. Press twice to return to normal operation.
EXIT
The following selections allow the user to perform standard maintenance
tasks. Use the keys to scroll through the menu selections, then press
ARROW
to select the displayed menu option.
ENTER
key to scroll to
RECR DR
and a mg/L reading. Press the
REC LO
or
REC HI ON SYSTEM ALARM
to accept.
EXIT
key to scroll to the
UP ARROW
key to scroll to
REC ADJUST
Section 2
menu and press .
ENTER
DOWN
.
or
REC LO
again to return to
SETUP
and press
ENTER.
to
ENTER
Page 39
Instrument Menu Structure