Calibration
Setting ZERO Control
1. Send an unchlorinated water sample to the sample flow cell of the FX-1000p Amperometric
Analyzer. Make sure that the unchlorinated water sample is the only sample going to the sample
flow cell and being measured by the FX-1000p.
If turning off the chlorination system is not possible to obtain an unchlorinated water sample, a carbon
filter should be used. See page 13 for suggested plumbing. Do not use distilled or deionized water,
use unchlorinated process water.
2. Wait 15 minutes for the cell unit to stabilize.
3. Check the unchlorinated sample with an accurate chlorine residual test instrument such as the FX-
1200 Chlorine Test Kit.
4. Locate the ZERO control (VR-1; see
Figure 37
, page 29). Adjust the ZERO
control until the FX-1000p display reads 0.00 ppm (+/- 0.01 ppm).
5. Wait 10 minutes and recheck the ZERO setting. If necessary re-adjust the
ZERO control to 0.00 ppm reading (+/- 0.01 ppm).
Establishing a proper ZERO set is the key to accurate measurement.
Setting Standard Control (Std.)
1. Divert the sample flow cell back to receiving the chlorinated water sample. Wait 10 minutes for the
sample flow cell to stabilize.
2. Use an accurate chlorine residual test instrument (such as the FX-1200) to determine the residual
chlorine of the water sample.
3. See
Figure 37
(page 29) to locate the Std. control (VR-2), and adjust it until the FX-1000p display
reads the known, ppm value.
If the Std. control is out of adjustment refer to “Coarse Adjustment”
on page 27.
4. Wait 10 minutes and recheck the residual chlorine value of the water sample.
5. Wait 30 minutes and repeat the ZERO control and Std. control adjustment
procedures, if necessary, to minimize interaction between the controls.
Figure 34
Figure 35
26
