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Optional device installation
4.
Enter the ambient air temperature (the current reading is displayed for reference)
using the numeric keypad.
5.
Enter the elevation above sea level for the specific location.
6.
Enter the membrane thickness. The operation of the sampler will be affected by the
choice of membrane thickness for the oxygen sensor.
For general purpose applications, the 1 Mil thick membrane is standard. This membrane
allows measurements in the 0 to 20 ppm range of dissolved oxygen and provides the
best general purpose trade-off between response time and durability.
The 2 Mil thick membrane can be used to measure up to 40 ppm dissolved oxygen. Its
increased thickness slows the response time of the sensor, but this membrane has
increased resistance to cuts and tears. For this reason, it is recommended for use in
wastewater aeration basins where solids in the water are in rapid motion.
7.
Enter the chlorinity (salinity) of the flow stream (typical wastewater is zero, sea water
is higher).
8.
Place the D.O. probe in open air and press any key. The sampler will wait for the
reading to stabilize before storing the calibration value. The screen will automatically
return to the calibration menu.
Note: The membrane of a charged sensor must be kept moist. If the membrane is allowed to dry
completely, the electrolyte film between the membrane and the platinum will evaporate, destabilizing
the sensor. If the sensor will be out of water for more than 30 minutes, put a small amount of water in
the silicon soaking cap, and install it over the protective guard. Lift the edge of the cap to break the
seal as it is being removed. This will prevent a vacuum from forming inside the soaking cap while it
is being removed which can result in the membrane becoming stretched.
Calibrating the D.O. temperature
1.
Place the probe and the thermometer in a liquid.
2.
Wait for the temperature reading to stabilize.
3.
Enter the actual temperature of the liquid.
7.5 Conductivity probe
7.5.1 Conductivity probe connection
7.5.2 Conductivity probe 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 (COND.) 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.
Table 11 Conductivity Probe Wiring (J-20)
Pin
Signal Description
Wire Color
A
Probe
Black
B
Probe
Red
C
RTD
White
D
RTD
Green
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
Q-Pulse Id VM373
Active 29/10/2013
Page 86 of 122
