TCSMA Conductivity System
Part 6 - Calibration
O & M Manual
23
REV G, 7/2009
6. While still in solution, adjust the
FINE SPAN
to dial
in the final value to
20.00 mA
.
7.
Pull sensor back into air, rinse, and gently shake
off solution. Re-adjust 4 mA point with
OFFSET
control if necessary. Repeat steps 6-7 with
FINE
SPAN
and
OFFSET
, going back into solution and
back out, until no additional adjustment is
necessary. Do not re-adjust the
ROUGH SPAN
during this final process.
6.4 Reverse
Operation
If reverse operation is desired (output current falls to 4
mA as conductivity increases), complete the following
procedure after calibration steps are performed from
6.3.
1.
Place
the
REV/DIR
switch in the
REV
position.
2. Hold sensor in air away from any nearby objects.
Sensor should be clean and dry. Adjust the
OFFSET
control until the output current from the
transmitter is
exactly 20.00 mA
.
3. Place the sensor in solution and allow the sensor
to temperature equilibrate. To minimize error, it is
best if solution is as close to possible to room
temperature. Allow the system to operate
undisturbed for 15-30 minutes. The sensor must
sit in the center of the beaker containing the
conductivity reference solution, without touching
the sides or bottom. Maintain at least 2” clearance
on all sides of the round sensing portion of the
sensor to prevent errors.
4.
Adjust
FINE SPAN
until output current is exactly
4.00 mA. Repeat steps 2-4 until no additional
adjustment is necessary.
