YSI 556 MPS Quick Start Guide

This Quick-Start Guide is meant to serve as a quick reference in operating the YSI
Model 556. It is not intended to replace the information found in the Operations
Manual. For your convenience, included in parenthesis for each section, are the section
numbers from the full-length manual where additional information may be found.

Model 556
Quick-Start Guide

INSTALLING THE DO MEMBRANE (3.4)

Note: The DO sensor is shipped with a dry shipping membrane to protect the
electrode. A new membrane cap must be installed before the first use.

1. Prepare the O

mixing, allow the solution to sit for 1 hour. This will help prevent air bubbles
from later developing under the membrane.

2. Unscrew and remove the probe sensor guard.

3. Unscrew, remove, and discard the old membrane cap.

4. Thoroughly rinse the sensor tip with distilled or deionized water.

5. Fill a new membrane cap with O2 probe solution. Be very careful not to touch

the membrane surface.

6. Thread the membrane cap onto the sensor, moderately tight. A small amount

of electrolyte should overflow.

7. Screw the probe sensor guard on moderately tight.

probe solution according to the instructions on the bottle. After

2

MENU FUNCTIONS (2.9 – 2.11)

The Model 556 is set up with a menu-based interface. To navigate through the menus,
use the up and down arrow keys to highlight a desired menu option, then press the
Enter key to open the menu feature. Press the Esc key to return to a previous screen.
The 556 will automatically power on to the Run screen. Press the Esc key to display
the main menu screen.

SETTING THE DATE AND TIME (10.2)

1. Select System Setup from the main menu and then select Date & Time.

2. Highlight Date and press Enter.

3. Use the keypad to enter the correct date and press Enter.

4. Highlight Time and press Enter.

5. Use the keypad to enter the correct military time and press Enter.

6. Press Esc several times to return to the main menu.

SETTING UP SENSORS & REPORTING PARAMETERS (4 - 5)

Although a sensor may be installed on the probe of the 556, it must be enabled in the
Sensor menu for it to operate. Once a sensor is enabled, the parameters and units to
display for that sensor must then be selected in the Report menu.

1. From the main menu, select Sensor.

2. Sensors which are enabled will appear with a black dot. If a sensor is

disabled, it will appear with an empty circle. Use the arrow keys to highlight
the sensor you want to change. Press the Enter key to enable or disable it.

3. When Dissolved Oxygen is selected, a submenu will appear with a selection of

membranes. Each membrane type is also identified by the color of the
membrane cap. Highlight the desired membrane choice and press Enter to
activate the selection. Press Esc to return to the Sensor menu.

4. Once changes to the Sensor menu have been completed, press Esc to return to

the main menu.

5. Select the Report menu option.

6. Parameters which are enabled will appear with a black dot. If a parameter is

disabled, it will appear with an empty circle. Use the arrow keys to highlight
the parameter you want to change. Press the Enter key to enable or disable it.

7. For some parameters, a new submenu will appear to allow a selection of units

for the parameter. Make a selection from the submenu and then press Esc to
return to the Report menu.

8. Once all changes are complete, press Esc to return to the main menu.

BAROMETER CALIBRATION (10.9 – 10.10)

Note: The following information is only for 556 Instruments equipped with the
optional internal barometer.

1. Determine your local barometric pressure (BP) in mmHg from a mercury

barometer, an independent laboratory or from a local weather service. If the
BP reading has been corrected to sea level, use the following equation to
determine the true BP in mmHg for your altitude:

True BP = (Corrected BP) – {2.5 * (Local Altitude/100)}

2. Select System Setup from the main menu and then select Calibrate

Barometer.

3. Use the keypad to input the known barometric pressure as determined in steps

1 and 2. Press Enter to confirm the value.

4. Press Esc to return to the main menu.