O & M Manual
19
REV D, 2/2007
Part 6 – Calibration
6.1 General
The transmitter is factory calibrated
in a default range of 0-
10,000 uS/cm. The transmitter must be re-calibrated with
the actual sensor for optimum accuracy using the following
procedure.
6.2 User
Interface
The user interface controls for the transmitter are quite
simple, and they are described below.
6.21
Offset
Adjustment
The offset adjustment sets the 4 mA output current
point for the system. This adjustment is made after
the proper range has been selected, and the sensor is
held in air. Offset adjustments can only be made to
zero-signal conductivity.
6.22
Coarse
Span
Adjustment
The coarse span adjustment sets the initial 20 mA
output current point for the system. This adjustment
is used to make the initial rough adjustment on the
sensor span.
6.23
Fine
Span
Adjustment
The fine span adjustment sets the final 20 mA output
current point for the system. This adjustment is used
to make the final, precise, adjustment on the sensor
span.
6.24
Range
Selection
This dipswitch selects the general range of operation
for the transmitter. Pick the range to be larger than
the maximum operating conductivity value of the
transmitter.
RANGE
CELL DRV
500 uS – 2,500 uS
1-ON, 2-ON
1-ON, 2-OFF
2,500 uS – 15,000 uS
1-ON, 2-OFF
1-ON, 2-OFF
15,000 uS – 100,000 uS
1-OFF, 2-OFF 1-ON, 2-OFF
100,000 uS – 1,000,000 uS
1-OFF, 2-OFF 1-OFF, 2-ON
