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__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
4.3.4 DENSITY CURRENT CALIBRATION
A.
Temporarily disconnect the wire at terminal 38.
between terminal 38 and the wire you disconnected with the digital voltmeter
set to the ammeter function. You will check the current between terminal
38 and the wire you disconnected. If no wire is connected to terminal 38,
measure between terminal 38 and common (terminal 57).
B.
Determine and note the density full scale output of Read Code 12 and
density zero output of Read Code 13.
C.
Set the measured density value of Read Code 0 to FXD and enter the full
scale density value.
D.
Adjust span trimpot R33 on PC Board No.2 until the meter reads
20.0 mA. See Figure 4-4.
E.
Enter the zero value of the density output into Read Code 0. Adjust zero
trimpot R40 until the meter reads 4.00 mA.
F.
Repeat steps C, D, and E until no further adjustments are required.
G.
Replace wire disconnected in step A and return unit to service.
146
Connect your probes
SECTION 4
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