Pro
20 /
Pro
20i
Quick Start Guide
Item #605645
This Pocket Guide is meant to serve as a quick reference in calibrating and operating the
Pro20/Pro20i. It is not intended to replace the information found in the User Manual.
Installing the DO Membrane
1.
Prepare the O
2
probe solution according to the instructions on the bottle. After
mixing, allow the solution to sit for 1 hour. This will help prevent air bubbles
from later developing under the membrane.
2.
Remove, and discard the red protective cap or used membrane from the sensor.
3.
Thoroughly rinse the sensor tip with distilled or deionized water.
4.
Fill a new membrane cap with probe solution. Avoid touching the membrane
portion of the cap.
5.
Thread the membrane cap onto the sensor, moderately tight. A small amount of
electrolyte will overflow.
6.
Screw the probe sensor guard on moderately tight.
Setting Sensor & Membrane Type
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 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.
The instrument’s Sensor Type must be configured for the sensor installed.
Failure to do this may result in damage not covered under warranty.
Barometer Calibration
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 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 in mmHg) – {2.5 * (Local Altitude in feet/100)}
