AW Gear Meters PROSCAN - Manual (Page 13)

ProScan In-Line Process Sensor
User Manual
12
When the sensor is operating within the current calibration range, the Green LED on the sensor’s
electronics board blinks alone. When over-range, the Red and Green LEDs blink, and when below range,
the Green and Yellow LEDs blink.
The resulting profile corresponds to the outputs from the unit at each of the various products. Use these
values as the reference for programming a receiver or to verify calibration of the ProScan sensor.
Changes in product properties (solids content) are a common cause for discrepancy. If observed, follow
the Calibration Procedure below.
Calibration Procedure
If you want to adjust the calibration, follow this procedure:
1. Obtain samples of all products that will be processed in this system. If using liquid sample, you
need sufficient volume of each to fill the tee. C
alibrate them in increasing order of
concentration. ProScan allows you to choose a variety of calibrations, from a 2-point calibration
to a 9-point calibration.
2. Be sure you wire the unit to either the receiver or to a Multi-meter so you are able to view the
corresponding signal output from the unit.
3. Remove the ProScan lid by turning it counterclockwise.
4. Remove the screw cap on sensor and turn the lid counterclockwise. This allows access to the
electronics board. Refer to Figure 3 on page 15 to locate the Calibration Switch, Entry Key and
Offset Adjustment Keys.
Be careful not to damage the rubber o-ring.
5. As shown in Figure 6 on page 14, fill the tee with clean water, or another fluid that you desire to
be the 4 mA reference (if a value other than 4 mA is desired for the base value, please see
SENSOR OFFSET and SPAN CALIBRATION section below).
6. Observe the mA reading that ProScan produces with the 4 mA reference sample. If the output is
4 mA, there is no need to adjust. If you desire to change the zero point, turn the calibration
switch to position “0”, and press and hold the ENTRY key for approximately two seconds. This
stores the new value as 4mA.
7. Remove the water, or optional base product, and fill the tee with the next highest solids
content.
Notice
Caution