Aquametrix 2300 Multi-Input Controller User Manual - Manual (Page 17)

N116-133 AquaMetrix 2300 Installation and Operation Manual Page 17
Figure 10 - Probe Configuration Wizard, page 2
Whether or not the scaling operation is a calibration depends on the signal provided by the
sensor. If the sensor output comes from a transmitter then it is likely that it has already by
calibrated at the transmitter. In this case the sensor signal coming into the 2300 simply needs
to be scaled to translate current readings to process variable units. If the sensor is a direct
sensor probe, e.g. a pH sensor, then the scaling operation is a true calibration and requires the
use of calibration standards, e.g. pH buffers for a pH probe.
Using these choices is detailed in the following sections, corresponding to page 3 of the
Wizard. After the scaling/calibration page, the user is brought to page 4 and prompted to
select the display digits after the decimal place and the number of significant digits desired.
Then, the Units of Measure is a pull down menu shown that allows the user to select the units
displayed for the probe being configured. Choose from a list of common units, or select Enter
New Unit to customize your selection. Try to keep the name of the units to 5 characters or
less e.g. µS/cm; although more characters are allowed, some screens don’t display long names
well. Page 5 is the description, followed by the monitors, described in Section 4.
3.5. Two-Point Scaling or Calibration
The third page of the wizard, shown in Figure 11 for the linear scaling option, provides for
scaling for both analog and digital inputs. The Linear scaling option allows a two-point
calibration of the probe using actual measurements by the probe in reference solutions.
Putting the probe into a known solution and hitting the Read mAmp Value automatically
inserts that value into the corresponding Low or High mAmp Value field. Input the know
process value (in the case of calibration, the value of the calibration standard) into the Scaled
value fields. The 2300 Controller will use these two values to scale all mAmp readings into
scaled, displayed values with the units chosen on page 4 of this wizard.