TT-CL
2
Free Chlorine Sensor
21
Appendix F
SENSOR SELECT
IN ORDER TO PERFORM A SPAN OF THE SENSOR IT IS NECESSARY TO HAVE AN INDEPENDENT METHOD OF
DETERMINING THE LEVEL OF THE MEASURAND, E.G. A DPD TEST KIT TO MEASURE FREE CHLORINE IN THE
SAMPLE WATER.
If the instrument is multi-channel a menu will appear to select the channel to calibrate. Scroll through
the menu and highlight the channel / probe. Press OK. If the instrument has only one probe this
menu will be skipped.
A 30 second ‘Collecting calibration data’ countdown will occur, during this time the validity and stability of the probe
signal is tested. During this countdown, it will be necessary to test the water (from the sample line feeding the probe
flow cell), using the necessary test kit. After 30 seconds, the ‘Enter Calibration Value’ screen, will show a fixed value
of the average signal measured. Once the concentration has been determined, use
to adjust the reading on the
display to equal that of the measured value. At this point press OK
0
to set the span for the probe. The statement
‘Calibration successful’ will appear. Note: If it is no longer possible to adjust the span of the probe to the value measured,
perform the probe maintenance procedure.
‘Calibration Failed. Please wait until process is stable for calibration’ would be displayed if calibration fails.
Finish to save and exit to the menu. Cancel or Exit, to exit without calibrating the sensor.
Sensor
Select Settings / Free Chlorine.
Settings
Select Name / Enabled / Auto-Flush / Source.
Then use the
and
to adjust.
OK or Cancel.
Exit.
Name – allows customer to identify signals (eg. Chlorine Probe) 1 to 16 characters.
Enabled – Yes / No. No means sensor is turned off.
Auto-Flush – Yes / No. Yes means enabled (optional extra).
Source – select Auto-Flush.
Free Chlorine
Select Type / Units / Abbreviation / Precision / Offline / Minimum / Maximum.
Then use the
and
to adjust.
OK or Cancel
Type – allows the user to change the type of probe connected.
Do not alter unless fitting a different probe.
Units – ug/l, mg/l, g/l, ppb, ppm, ppt, %.
Abbreviation – allows customer to identify signals (eg. Cl) 1 to 5 characters.
Precision – 0 to 5 characters.
Offline – 0 to 10,000. The display (and outputs) will show the value set when the sensor is in error / warm up / not enabled.
Minimum – range of the sensor.
Maximum – range of the sensor.
Select Averaging.
Then use the
and
to adjust On / Off.
OK or Cancel
If Averaging is On, use Select Delay / Size.
OK or Cancel.
Delay – 0 to 600 seconds. The value is the averaging loop time.
Size – 1 to 60. Window size for the rolling average.
