87
Optional device installation
6.
Press
CHANGE CHOICE
to select the appropriate units (ms,
μ
s). Press
ACCEPT
to
continue.
7.
Select another channel to configure or press
RETURN
to back up one step or press
MAIN MENU
to return to the Main Menu display.
7.5.3 Conductivity temperature programming
1.
From the Main Menu, select
OPTIONS, ADVANCED OPTIONS, DATALOG.
2.
Highlight Select Inputs using the
up
and
down
keys, then press
SELECT
.
3.
Highlight Conductivity Temperature (COND. TEMP.) using the
up
and
down
keys,
then press
SELECT
.
4.
Press
CHANGE CHOICE
to cycle between Logged and Not Logged, then press
ACCEPT
.
5.
Enter a logging interval, then press
ACCEPT
. Valid logging intervals are shown on the
status bar along the bottom edge of the display.
6.
Press
CHANGE CHOICE
to select temperature units (°C, °F). Press
ACCEPT
.
7.5.4 Conductivity probe calibration
1.
From the Main Menu, select
OPTIONS, ADVANCED OPTIONS, CALIBRATION,
CONDUCTIVITY.
2.
Clean and dry the probe.
3.
Place the sensor and thermometer in the calibration solution
(Cat. No. 3230).
4.
Allow the sensor to stabilize in the solution about 10 minutes to ensure that the probe
and the solution are the same temperature.
5.
Enter the temperature correction factor or enter zero (0) for no correction factor.
Note: The temperature correction factor is used to compensate for the effects of temperature on the
conductivity readings at the point of installation. The conductivity of a solution is temperature
sensitive. Therefore the actual conductivity of the solution will change with the temperature. Each
site may have a different correction factor depending on the major constituent of the flow stream.
This is not used for calibration and has no effect on the calibration of the sensor. Below are some
examples of compensation factors of various liquids.
•
0.96%/°C 5% Sulfuric Acid
•
1.88%/°C Dilute Ammonia
•
1.91%/°C ‘Typical’ Wastewater
•
1.97%/°C Potassium Chloride
•
2.12%/°C Salt (Sodium Chloride)
•
2.84%/°C 98% Sulfuric Acid
•
4.55%/°C Ultra-pure Water
6.
With the sensor still in the calibration solution, press any key. Wait for the sensor to
stabilize. Calculate the actual conductivity of the calibration solution. If using the KCl
solution provided by the manufacturer, make your selection from the calibration (refer
to Table 12on page<$pagenum>). If using a solution other than 1.0 mS @ 25 °C KCl
available from the manufacturer, you must calculate the conductivity of the solution
using temperature correction factors. Refer to the following example.
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
Q-Pulse Id VM373
Active 29/10/2013
Page 87 of 122
