YSI Pro20 Quick Start Guide

probe solution according to the

2

Pro20

Pocket Guide

membrane from the sensor.

bubbles from later developing under the membrane.

SETTING SENSOR & MEMBRANE TYPE

4. Fill a new membrane cap with probe solution. Avoid

3. Thoroughly rinse the sensor tip with distilled or

2. Remove, and discard the red protective cap or used

6. Screw the probe sensor guard on moderately tight.

5. Thread the membrane cap onto the sensor, moderately

The instrument’s Sensor Type must be configured for the sensor

installed. Failure to do this may result in damage not covered

under warranty.

The instrument will step you through an initial configuration

when powered on for the first time. This allows you to set the

language, sensor, and membrane options. Use the up or

calibrating and operating the Pro20. It is not intended to

replace the information found in the Users Manual.

INSTALLING THE DO MEMBRANE

1. Prepare the O

instructions on the bottle. After mixing, allow the

solution to sit for 1 hour. This will help prevent air

tight. A small amount of electrolyte will overflow.

touching the membrane portion of the cap.

deionized water.

SALINITY COMPENSATION CALIBRATION

The Pro20 uses an inputted salinity value in ppt (parts per

thousand) to compensate dissolved oxygen mg/L values.

To adjust the salinity compensation value: This Pocket Guide is meant to serve as a quick reference in

1. Use the up or down arrow keys to highlight the salinity

compensation value to the salinity of the water you are

testing.

box on the run screen, then press enter.

2. Use the up or down arrow keys to adjust the salinity

compensation value.

1. Turn the instrument on and wait 5-15 minutes if using a

3. Press enter to confirm and to save the new salinity

TAKING MEASUREMENTS

Revision A

May 2008

instrument will confirm that the reading was successfully

the probe in the sample at a rate of at least 6 inches per

polarographic sensor.

second until the readings stabilize.

2. To take readings, insert the probe into the sample. Move

saved.

CONTACT INFORMATION

3. Highlight Save and press enter to store the reading. The

YSI

1700/1725 Brannum Lane

Yellow Springs, OH 45387

Tel: [phone] (937-767-7241) Item # 605645

Website: www.ysi.com

Fax: [phone] Drawing # A605645

E-Mail: [e-mail]

calibrated with the press of one key when One Touch Cal is

enabled in the System Setup menu.

key for three seconds.

small amount of water and install it on the probe. The

cal/transport sleeve ensures venting to the atmosphere.

Make sure the DO and temperature sensors are not

The following procedure outlines the % saturation calibration

option with and without One Touch Cal enabled.

1. Moisten the sponge in the cal/transport sleeve with a

wait 10 minutes for the DO sensor to stabilize. Galvanic

immersed in the water.

2. Turn the instrument on. If using a polarographic sensor,

values along the bottom of the screen are accurate.

sensors do not require a warm up time.

3. Ensure the barometer reading and salinity correction

4. Press and hold the Cal

Calibrating %DO on the display and automatically

calibrate the sensor to the barometer reading and salinity

correction value.

5. If One Touch Cal is enabled, the instrument will indicate

DO% and temperature readings along with the %

calibration value. Wait at least 3 seconds, then, once the

DO% and temperature readings are stable, press enter to

and press enter. The Pro20 will display the current

6. If One Touch Cal is not enabled, highlight % or %Local

complete the calibration.

7. Calibration Successful will display for a few seconds to

display on the screen. Press the Cal key to exit the error

indicate a successful calibration and then the instrument

will return to the run screen.

message and return to the run screen.

8. If the calibration is unsuccessful, an error message will

down arrow keys to highlight the appropriate language,

sensor, and membrane, then press enter to confirm. To

change the sensor or membrane type after the initial

configuration, press the Menu key.

BAROMETER CALIBRATION

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:

The barometer reading must be accurate to ensure accurate

DO % calibrations and DO readings.

If your barometer requires an adjustment:

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

in feet/100)}

True BP = (Corrected BP in mmHG) – {2.5 * (Local Altitude

reading to the local, true barometric pressure.

highlight the barometer box then press enter.

4. Press enter to confirm and save the barometer

3. Use the up or down arrow keys to adjust the barometer

2. From the run screen, use the up or down arrow keys to

adjustment.

DO CALIBRATION

The Pro20 can be calibrated in % saturation, mg/L, or ppm.

Calibration of any option (%, mg/L, or ppm) will

automatically calibrate the others. The Pro20 can be