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8.6 DISPLAY UNITS
8.6.1 Purpose
This section describes how to do the following:
1. switch the process display units between pH and ORP (millivolts),
2. select °C or °F for the temperature display,
3. select percent of full scale or milliamps for the output display,
4. program a security code.
8.6.2 Definitions
1. DISPLAY UNITS. Select pH if the transmitter is being used to measure pH. Select
ORP if the transmitter is being used to measure ORP. ORP is oxidation-reduction
potential. ORP has units of millivolts and is usually measured with an inert metal elec-
trode, such as a platinum electrode. The units selected are shown in the main display
next to the measured value.
2. OUTPUT CURRENT DISPLAY. The transmitter generates a 4 to 20 mA output signal
directly proportional to the pH of the sample. The output signal appears on the same
line with the temperature. The output signal can be displayed as current (in mA) or as
percent of full scale.
3. SECURITY CODE. The security code unlocks the transmitter and allows complete
access to all menus. The transmitter is shipped with the security code disabled.
8.6.3 Procedure
1. Press PROG on the infrared remote controller (IRC).
2. Press NEXT until the dISPLAY sub-menu appears. Press ENTER .
3. The screen displays the tYPE prompt. Press Ï or
Ð
to toggle between pH and OrP.
Press ENTER to save.
4. The screen displays the tEMP prompt. Press Ï or
Ð
to toggle between C and F.
Press ENTER to save.
5. The screen displays the OUtPUt prompt. Press Ï or
Ð
to toggle between % and
CUR. Press ENTER to save.
6. The screen displays the COdE prompt. Use the editing keys to enter a security code
between 001 and 999. Entering 000 disables the security feature. Press ENTER to
save. The security code does not become effective until about two minutes after the
last keystroke.
7. Press EXIT to return to the process display.
PROGRAM
OUtPUt
EXIT ENTER
CUR
PROGRAM
CODE
EXIT ENTER
000
PROGRAM
tYPE
EXIT ENTER
PH
PROGRAM
tEMP
EXIT ENTER
C
PROGRAM
dISPLAY
EXIT NEXT ENTER
MODEL 3081 pH/ORP SECTION 8.0
PROGRAMMING FOR pH MEASUREMENTS