11
FIGURE 2-1
Wiring Setup
SECTION 2.0 QUICK START-UP PROCEDURE
2.1 General. The 2081 pH is shipped from the factory
in a configuration that is acceptable in many applica-
tions. The instrument is set-up as follows:
• Measures from 0-14 pH
• 0 pH will correlate to a 4 mA current output
• 14 pH will correlate to a 20 mA output
• Temperature readings will be in degrees C
• Automatic temp. compensation will be on
• External preamplifier
If this described set-up is compatible with your appli-
cation, you can utilize the following Quick Start-up
instructions, below, to expedite the commissioning
and calibration of your instrument. Otherwise, follow
the detailed instructions in Section 3.0
to set the
desired pH range, Section 4.0 to start-up, and
Section 5.0 to calibrate your instrument.
2.2 Set-up instrument.
Connect a power supply, current meter and an appro-
priate sensor to the 2081 Transmitter, as illustrated in
the figure below.
2.1.1 Connect loop power: -wire
power supply to the 2081 (TB2) -
adjust supply to approx. +24VDC
2.1.2 Connect current meter:
-wire meter to TEST connections to read
mA output (+ to +)
Model 2081 (short cover removed)
View of Interface PCB
* Install JP1 if internal preamplifier is
used. Remove if sensor or junction
box preamplifier is used.
2.1.3 Connect Sensor to 2081:
- wire sensor to TB1 as
illustrated below
2.1.4 Prep Sensor for calibration: (Refer to Sensor Manual)
Examples: - 381 Sensor must have a liquid junction and glass electrode installed
-399 Sensor requires removal of red boot cover, only
– *Black to TB1-1, instead of TB1-2, if unit has
JP1 in place.
12 11 10 9 8 7 6 5 4 3 2
4 3 2
TB2
TB1
SENSOR
mA
Power
Supply
– Loop
+ Loop
Black (mV-in)
Green (+5)
White (RTD IN)
Clear (RTD COM)
Red (RTD SEN)
TEST
+
+
+
MODEL 2081 pH SECTION 2.0
QUICK START-UP PROCEDURE
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