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Thermo Scientific Orion Star A113 Benchtop & Star A123 Portable Dissolved Oxygen Meters
Chapter 2 Meter Overview
Connections
1. Power source:
a. Power adapter (included with Orion Star A113 benchtop DO meters, sold separately for Star A123
portable DO meters) – Select the appropriate wall socket plug. Slide off the clear plastic cover, and slide
on the plug plate into the groove on the back of the adapter.
b. Batteries (included with and factory-installed on Star A123 portable DO meters, sold separately for Star
A113 benchtop DO meters) – Select four AA batteries. Confirm that the meter is off and remove the
battery compartment cover. On the Star A123 portable meter, to remove the battery compartment cover:
i. Loosen the screws.
ii. Release the top portion of the battery compartment from the meter (using a coin or your finger.)
iii. Release the bottom portion of the battery compartment (using a coin or your finger). Insert batteries
as shown in the battery compartment housing.
Push down on tab and lift the
battery cover
Orion Star A113 Benchtop
Remove screws
Orion Star A123 Portable
Figure 1
2. Prepare the DO probe according to the probe instructions. In general:
a. Unscrew the membrane cap from the DO probe, fill the membrane cap about ¾ full with polarographic
electrolyte solution and screw the membrane cap onto the DO probe.
b. Connect the DO probe to the meter and allow the probe to polarize for about 30 to 60 minutes.
Note:
A DO reading of zero and no change in temperature indicates that the DO probe is not fully
connected to the meter. Disconnect the DO probe and then firmly reconnect the DO probe to the meter.
3. Connect the appropriate item as labeled on the meter and as shown in figure 1: