10-Second Calibration

Calibration Options

CHEMTROL® sensors offer the flexibility of calibration with either a 1, 2, or 3-Point calibration method, which adjusts for origin, slope, and curvature. Our user-friendly menu enables operators to complete a 1-point calibration in as little as 10 seconds. Please note that, for a quick calibration, it is essential not to remove the sensors from the by-pass line assembly.

You can perform sensor calibration using a PC, laptop, or any mobile device. The most convenient approach is to utilize the CHEMTROL® App, available on both Android and Apple devices.

The CALIBRATION menu functions is common to all sensors. This includes pH, PPM, Conductivity/TDS and Temperature.

Calibration Sub-Menu

The CALIBRATION sub-menu is used to select the number of calibration points desired. Most applications require only 1- Point calibration but any number up to three can be selected. If more than 1-point calibration is selected, the operator needs to use calibrated buffer solutions. These sample solutions must be spaced sufficiently from one another to yield meaningful calibration values.

One-Point Calibration

When using 1-Point calibration, the conversion curve for the sensor readings is a straight line using the standard (default) slope built in the program. 1-Point calibration should be satisfactory for most applications. The operator test the water with an appropriate test kit, the value obtained is then entered on the calibration screen as the new display value. The controller uses the calibration value that has been entered by the operator to calculate the origin “a” of the representative linear equation: DISPLAY = a + SLOPE * INPUT.

Two-Point Calibration

With 2-Point calibration, the operator needs to use two different solutions with values that are spaced widely enough to show significant differences in the slope of the calibration curve. The controller uses these values to compute the origin “a” and slope “b” in the equation: DISPLAY = a + b * INPUT.

Three-Point Calibration

With 3-Point calibration, the representative straight line is replaced by a second-degree polynomial curve. The operator needs three different solutions, again with values that are spaced widely enough to show differences in the curvature of the polynomial. The controller uses these values to compute the origin “a”, slope “b” and curvature “c” in the equation: DISPLAY = a + b * INPUT + c * INPUT*INPUT.

* Pressure and Flow have only direct 1- point calibration.