Hach 3625 User Manual

Operator Quick Guide

ORBISPHERE 3625

Revision F - 04/04/2008

Operating Information

About this Guide

The information in this guide has been carefully
checked and is believed to be accurate. However,
Hach Ultra assumes no responsibility for any
inaccuracies that may be contained in this guide.
In no event will Hach Ultra be liable for direct,
indirect, special, incidental, or consequential
damages resulting from any defect or omission in
this guide, even if advised of the possibility of
such damages. In the interest of continued
product development, Hach Ultra reserves the
right to make improvements in this guide and the
products it describes at any time, without notice or
obligation.

Instrument Controls

Delivered with the 29976 package piercer, is the
3625 indicating instrument. The front panel of the
instrument has several displays and controls.

The Key Switch should be turned to the
horizontal unlocked position to start the
instrument in measurement mode. The function
keys are only active if the key switch is in the
unlocked position. Use the vertical locked position
to avoid accidental modifications.

The Display has a two-line liquid crystal display
(LCD), having 16 characters per line.

A Light Button, when pressed, provides
illumination to the LCD for three minutes.

Four Function Keys provide simple operator
control over the instrument functions:

• ESC back one step.

•  or  move through the loop of
available data (selection blinks).

• ENTER confirm selection.

Main Menu

The main menu is reached by pressing ESC as
many times as needed:

• MEASURE: Measurement

• OPTIONS: Set up the instrument

• CALIBRATE: Calibration procedures

Entering Values

When entering numbers, several digits are
displayed. The caret symbol ^ represents the
cursor. After entering the last digit, the new value
is saved.

•   increase or decrease the number
value

• ENTER move cursor one digit to right

• ESC move cursor one digit to left

• ENTER confirm last value entered

•   move decimal point (when
applicable)

• ENTER confirm and exit

OrbiPack PC Software

The Beverage Package Analyzer system works
with the OrbiPack software. Ensure that:

• An RS232 cable is connected from your
PC to the instrument

• The PC is turned on

• The software is running

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Measurement Menu

The flow chart below gives an overview of the MEASURE menu and sequence.

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Measurement Process

Start the Instrument

The key switch on the instrument must remain in
the vertical position to perform measurements.

A configuration screen is displayed for a few
seconds, and then the message prompts you to
start the measurement sequence.

This message remains on for a few seconds, and
then the display shows the atmospheric pressure
(P1) and temperature (T1) in the analyzer
manifold. The pressure and temperature screen
alternates with the preceding message until you
either pierce a package (or press ESC to return to
the main menu).

Package Pressure Equalization

In order to perform an accurate analysis, partial
pressure in the package must be balanced
between the gas phase (headspace) and the
liquid phase (beverage). The packages to be
tested must be gently agitated in a longitudinal
direction for at least three minutes, using a
reciprocating shaker.

Prepare for Piercing

First, make sure the piercing knife used is correct
for the application (metal or plastic).

Check that the sampling tube is fully retracted
inside the piercing knife, and that the rubber seal
is in good condition and extends slightly below the
piercing knife tip.

To clamp a package into position, tilt the piercing
lever backward, install a package on the mat, and
bring the lever to the vertical position. The
package must be vertical on the base mat, and
centered in the upper positioning plate. During the
analysis, the package must remain firmly
clamped; if not check the positioning device
height adjustment.

Following instructions given by the system, pierce
the package where the surface is smooth and flat,
to get a good seal.

Pierce the Package

When prompted, pull the piercing lever down all
the way in a uninterrupted move.

During analysis, any pressure leak past the
rubber seal will alter results. Do not release the
piercing lever until it is all the way down.

Headspace analysis is automatically triggered.
When complete, the display will prompt you to
lower the sampling tube.

Holding the piercing lever:

• Lower the sampling tube until all the way.
The product sampling and analysis is
then automatically triggered.

• Adjust the flow meter to 150 ml/min.

Visually check that the liquid in the tubing and flow
chambers is not foaming. Increase the forcing gas
pressure if necessary.

When analysis sequences are over, the display
will ask you to remove package.

• Raise the sampling tube to its upper
position, holding it only by the handle bar

• Lift the piercing lever all the way (past the
2 step device, if applicable)

• Remove the empty package

The instrument should display the Pierce
package message, saying that the equipment is
now ready for a new package sampling.

Daily Cleaning (user maintenance)

Every 8 hours of use or when a measurement
session is over, whichever comes first, the
sampling circuit must be flushed to remove any
product deposit in the sampling lines and
chambers.

Perform a measurement routine, using a package
filled with clean water and some non aggressive
liquid detergent (do not use caustic soda). Use
either:

• 0.5% bleach (sodium hypo chlorite) at
room temperature

• 5% Contrad (dilute caustic detergent) at
40° C

The measuring instrument waits for the evidence
of piercing to continue, so press ENTER to
bypass this step. Repeat this operation with two
packages filled with water low in dissolved
oxygen.

Let the system purge run for 5 minutes to purge
liquid out and dry the system.

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