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MODEL 3081 pH/ORP SECTION 10.0
PROGRAMMING FOR ORP MEASUREMENTS
PROGRAM
rEF
EXIT ENTER
LO
PROGRAM
IM PtC
EXIT NEXT ENTER
ON
PROGRAM
rOFFSt
EXIT ENTER
PROGRAM
dIAGnOS TIC
EXIT NEXT ENTER
060
PROGRAM
d I A G
EXIT ENTER
OFF
10.4.3 Procedure
1. Press PROG on the infrared remote controller (IRC).
2. Press NEXT until the diAGnOStIC sub-menu appears. Press ENTER .
3. The screen displays the rOFFSt prompt. Use the editing keys to change the flashing
display to the desired standardization (reference) offset (in millivolts). The range is 0 to
1000 mV. Press ENTER to save.
4. The dIAG prompt appears. Use the Ï or
Ð
keys to enable (On) or disable (OFF) the
sensor diagnostics. Press ENTER to save.
5. The IMPtC prompt appears. Use the Ï or
Ð
keys to enable (On) or disable (OFF) glass
impedance temperature compensation. Because glass impedance is a strong function of
temperature, correcting glass impedance for temperature is recommended. A third set-
ting (SPC) appears in addition to On and OFF. Do not select SPC; the setting is intend-
ed for factory use. Press ENTER to save.
6. The rEF prompt appears. Press Ï or
Ð
until the desired setting appears. LO identifies
a low impedance reference electrode, and HI identifies a high impedance reference
electrode. Press ENTER to save. Selecting LO disables the low impedance warning
and failure limits for the reference electrode.
NOTE
Be sure the jumpers on the analog board are set to match the reference
electrode impedance. See Section 2.2, Pre-Installation Set Up.
7. The rFH prompt appears. Use the editing keys to change the display to the desired ref-
erence electrode high impedance fault value. The allowed ranges are
Type of reference electrode Allowed range
Low impedance (LO in step 6) 0 - 2000 kilohms
High impedance (HI in step 6) 0 - 2000 megohms
Entering 0000 disables the feature. When the reference electrode impedance goes
above the fault value, the transmitter displays the diagnostic message rEFFAIL and sets
a fault condition. Press ENTER to save.
PROGRAM
rFH
EXIT ENTER
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