Operator Quick Guide
ORBISPHERE 3658
Revision A - 28/04/2008
CAUTION
General 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.
To avoid damaging the sensor, never remove the
flow chamber during normal operation. The flow
chamber should only be removed during service
procedures.
Operating Controls
The front panel of the instrument has a three-digit
liquid crystal display (LCD). The LCD includes a
right-side marker to distinguish between gas
concentration and temperature display. This
marker also indicates the measurement display
units (g/kg, V/V, etc.) depending on the
instrument configuration. To the LCD's right is a
label showing the measurement units configured
at the factory for your application.
The button in the bottom right corner backlights
the LCD for approximately three minutes. The
other push-button controls are:
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• POWER turns instrument power on or
places it in standby. The instrument
performs a series of start-up tests before
switching to measurement mode
• MEAS places the instrument in
measurement mode
• CAL calibrates the analyzer against a
reference sample. This button can be
locked out from the Hach Ultra 3658 PC
program
• STO stores a measurement value into
memory
• The × Ø keys toggle between gas
concentration and temperature
measurement displays in measurement
mode, increases or decreases the
storage number during storage or
memory view, or sets a calibration value
during calibration
• POWER + CAL selects dissolved or
gaseous measurement phase
• POWER + STO starts automatic data
acquisition.
• POWER + × starts memory storage view
• POWER + Ø starts continuous purge
mode
There is also a pressure relief valve on top of the
instrument. This button need only be pressed if
pressure builds up inside the instrument due to
large temperature changes.
Startup
To start the instrument, press the keyboard
POWER switch. When you turn power on, the
instrument displays the software version number
briefly, and then starts a series of start-up tests.
This process should take only a few minutes,
during which time a [tSt] message is displayed
on the LCD. Once the tests are completed, a
clearing message [---] is displayed for a further
sixty seconds before the instrument switches
automatically to measurement mode.
The analyzer can be operated independently,
making measurements as a portable carbon
dioxide gas analyzer.
You may store these measurement values for
later analysis via the Hach Ultra 3658 program
(on your personal computer) or the memory view
mode (on the instrument).
Measurement
Taking Measurements
Measurement updates are displayed every 20
seconds. For accurate measurements, the
sensor's membrane must be at the same
temperature as the sample to be analyzed. If this
not the case, allow some sample to pass through
the flow chamber for about 3 minutes before
taking any measurements.
The LCD includes a right-side marker to
distinguish between gas concentration
measurements and temperature. To switch
between gas measurement and temperature
measurement, press the × Ø buttons.
The analyzer will store up to 500 gas
measurement values, labeled by numbers 0
through 499, along with the current date and time
of each measurement. You have the choice of
acquiring this information manually or
automatically, as described below.
Automatic Data Acquisition
Before starting automatic measurement storage,
first select the sampling rate desired using the
Sampling Rate menu of the Hach Ultra 3658
program.
Gas concentration measurements are displayed
for about two minutes. After two minutes the
instrument displays the sample number (starting
at 000), then the gas concentration measurement
value followed by [---] to indicate the
measurement is being stored.
This storage sequence repeats automatically, at
the rate specified.
To end automatic storage, put the instrument into
standby (by pressing the POWER key) while it is
in normal measurement mode. Switching ON
again without holding down the STO button
returns the instrument to measurement mode.
Manual Data Acquisition
Put the instrument into standby (by pressing the
POWER key). Then hold down the STO button
while switching the instrument back ON. The LCD
displays the message Sto for about one second.
For the first measurement you wish to store, press
the STO button once to display a sample number.
The default sample number is 000 (for first time
access), or the last used memory position where
data was stored, incremented by a value of 1.
You can increase or decrease this number by
pressing the × Ø buttons within three seconds.
Press STO a second time, within five seconds of
the first. The instrument then displays the gas
concentration measurement value for about three
seconds, followed by a clearing message as the
value is stored. Repeat to store additional
measurements.
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Measurement (cont)
Viewing Stored Measurements
Put the instrument into standby (by pressing the
POWER key). Hold down the × button while
switching the instrument back ON. The LCD
displays a sample location number.
Scroll through the numbered sample locations of
all the stored values using the × Ø buttons.
To view the actual gas concentration
measurement value at a particular sample
number, press the STO button. The LCD now
displays the stored value for that sample number.
Press STO a second time to return to the next
numbered location display, to continue scrolling
or view another stored value.
To return to the measurement mode, put the
instrument into standby and then turn back ON
again without holding down any additional
buttons.
Downloading Stored Values
If you have made measurements and stored them
in the analyzer, you should be ready to bring them
into the Hach Ultra 3658 program for viewing,
copying, saving and printing.
To download stored data from the analyzer to the
PC, choose the DownLoad data command from
the Logger menu.
The window displays the stored measurements
from the instrument showing the sample number,
gas concentration, a date and time stamp, and a
sample description.
Altering Sample Point Description
For help in identifying the locations of various
sampling points that are stored, you may choose
the Sampling Point Description command from
the Logger menu.
The measurement values to be placed in
positions 0 through 499 can be described
however you wish. Double-click on a particular
position (or click Modify), then type a description
in the box.
Copying Values
To copy the results to the Windows Clipboard, so
that the data can be pasted into a spreadsheet,
word processor or other Windows program that
accepts tabular text information, choose the
Clipboard command from the Export menu.
Saving Values
To save this list of measurements as a text file,
capable of being recalled by the Hach Ultra 3658
program or imported as a file into other Windows
programs, choose the Save As command from
the File menu and enter the device and file name.
Print Data
To place this list of measurements into a tabular
format and send it to the printer, choose the Print
command from the File menu.
Clearing Stored Values
To clear all the values stored in the instrument,
choose the Clear Data command from the
Logger menu. Since this action will clear the
storage memory of the instrument, a warning
appears which you must confirm. Choose Clear
to start the memory clear operation.
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Measurement (cont)
Timebase Updating Rate Max.
Samples
30 Seconds/Division 5 Secs/Sample 60
1 Minute/Division 5 Secs/Sample 120
10 Minutes/Division 5 Secs/Sample 1,200
30 Minutes/Division 9 Secs/Sample 2,000
1 Hour/Division 18 Secs/Sample 2,000
2.5 Hours/Division 45 Secs/Sample 2,000
Monitor Measurements in Real-Time
You may wish to analyze a particular sampling point via the Hach Ultra 3658 program's Monitoring
menu. To use this Monitoring chart, the analyzer must be connected to your PC.
Choose Monitoring from
the Hach Ultra 3658 menu
to bring up a chart display.
The chart shows the gas concentration (in blue), temperature (in red), and pressure (in green) as the sample is being measured by the 3658 instrument. The chart is updated directly from instrument measurements, at a rate determined by the time scale set in the TIMEBASE box at the lower right corner of the chart.
Click the TIMEBASE up/
down pointers to change
divisions of the chart. Each division mark along the baseline (1, 2, ...10) can be made to represent from
30 seconds to 2½ hours, providing from 5 minutes to 25 hours of continuously displayed samples (as
illustrated in the table).
Click on the Continuous box to enable or
disable continuous charting. When this box is
checked, the chart scrolls continuously after
reaching the 10 division, and the oldest
samples are lost off the left of the chart.
When Continuous is not checked, the chart
stops displaying new results after reaching
the 10 division, and all subsequent
measurements are lost.
Click the up/down pointers for each
measurement variable (GAS,
TEMPERATURE and PRESSURE) to
change the scaling of that value on the chart. The display of each measurement variable may be turned
on or off by choosing the appropriate On or Off switch.
A running display of latest sample Gas, Temperature and Pressure is also shown in the bottom-right
corner of the chart.
Use the buttons at the bottom of the chart to control real-time monitoring. Choose Go to clear the chart
and start real-time monitoring, Stop to stop monitoring and Copy to copy the data from the chart as text
information to the Windows Clipboard. This information can be pasted from the clipboard into any
Windows application, such as a spreadsheet or word processor.
Choose Close to close the Monitoring window.
the time scale of the
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Instrument Configuration
The following commands are all available from
the Configuration menu in the Hach Ultra 3658
software installed on your PC.
The instrument must be connected to your PC in
order to change its configuration.
ANALYZER - PC CONNECTION
The Serial port menu lets you choose one of four
serial communication ports. Usually, COM1 is
used to connect to a mouse, so try COM2 first.
GAS MEASUREMENT PHASE
The instrument can measure CO
in either a liquid
2
or a gaseous sample, but you must select which
gas phase to use.
MEMBRANE SELECTION
Membrane 29561A is the only membrane valid for
CO
gas measurement with this analyzer.
2
To ensure the analyzer is correctly configured,
choose Membrane to bring up the box which
reveals the membrane models available.
Membrane 29561A should be the only membrane
available for selection.
SETTING SAMPLING INTERVALS
The analyzer can perform as a standalone data
acquisition device, automatically recording gas
measurements with the date and time, and storing
up to 500 of these values.
Choosing the Hach Ultra 3658 program's Gas
Phase option lets you select the gas
measurement phase.
MEASUREMENT UNITS
Choose the Units option to select gas
measurement units, temperature measurement
units, and the liquid medium in which you are
measuring.
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Choosing Sampling Rate lets you select time
intervals (acquisition rate) for this storage
capability.
CALIBRATION MEDIUM
Use the Calibration medium command to select
how the sensor is to be calibrated.
Choose either in pure CO
gas at atmospheric
2
pressure or in a liquid or gaseous solution at a
known concentration of gas.
ROLLING AVERAGE
Choose Rolling Average Status to enable or
disable the averaging of gas concentration
measurements. To enable averaging on three
successive gas measurements, choose Enable.
Choose Disable to disable rolling average.
Instrument Configuration (cont)
WINE PARAMETERS
Choose Wine Parameters from the
Configuration menu to provide a correction for
the alcohol and sugar content of the wine.
This sets two parameters that influence the
solubility of CO
Alcohol in the wine, and the concentration of
Sugar, in °Brix.
LOCKING THE CALIBRATION BUTTON
You can use the Sensor Calibration Status
menu to prevent an accidental sensor recalibration from the instrument keyboard.
Enable or Disable the instrument front panel
CAL button. Disabling the button will prevent
accidental sensor re-calibration.
INSTRUMENT CONFIGURATION REVIEW
To review if the analyzer is set up as expected, choose the Configuration view command.
in wine. This is the degrees of
2
AUTOMATIC SHUTDOWN
Choose Automatic Shutdown Status from the
Configuration menu to activate the Automatic
Shutdown feature.
If you select Enable, the instrument switches off
automatically after 10 minutes of inactivity,
thereby economizing battery power.
MEASUREMENT MODE
Choose Measurement Mode to enable maximum
measurement mode for sampling in bottles and
cans.
In Maximum measurement mode, the
instrument searches for two consecutive
measurements with less than a 2% difference.
When this occurs, the display is frozen and you
may store the data. The instrument remains in this
mode until you select Normal measurement
mode.
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Note :
Calibration
BAROMETRIC PRESSURE SENSOR
The instrument internal barometric pressure
sensor is calibrated at the factory, and normally
requires no further attention. However, you may
wish to calibrate it against your own
instrumentation, or simply check the instrument
for accuracy.
Select Troubleshooting, Pressure Calibration
from the Hach Ultra 3658 program, and enter the
current atmospheric pressure, in mbars, in the
calibration pressure entry box.
GAS SENSOR
The sensor can be calibrated in a liquid solution
with a known concentration of CO
recommend using the ORBISPHERE High
Precision Calibration Kit), or in pure CO
atmospheric or elevated pressure.
Before calibrating check that the sensor
membrane surface is tight, smooth and wrinkle
free. Select the calibration medium using the
Hach Ultra 3658 program.
Ensure that normal measurement mode is
selected in the Measurement Mode menu of the
Hach Ultra 3658 program
Calibration must only be carried out once the TC
sensor is giving a stable measurement. Expose
the membrane to the calibration sample until this
stable reading is obtained. This usually takes
about 5 minutes.
For calibration it is important that the sensor's
membrane is at the same temperature as the
calibration sample. Therefore, allow some sample
to pass through the flow chamber for 3 minutes
before calibrating.
If calibrating in gas, ensure that the flow chamber
and sensor components are completely dry.
Remove and blow dry the flow chamber, and dry
the sensor head surface with a clean soft tissue.
Ensure that the purge cycle is running correctly by
placing the purge gas exit tubing into water. This
rate should be more than four bubbles during the
purge which lasts for 4 seconds. This purge cycle
is repeated every 20 seconds.
(we
2
gas at
2
When press the CAL button, remember that this
button may have been locked out by the Hach
Ultra 3658 program to prevent an accidental
reset.
In all calibration methods, calibration is successful
or in error, as per the following definitions:
• If the instrument makes two consecutive
measurements with less than 1%
difference, it calibrates against this
stabilized value. The LCD then displays
the message [CAL] to indicate
calibration has been successfully
completed
• If the calibration does not complete, the
LCD displays the message [Err]. The
reason for this calibration error is either
that the measured gas partial pressure is
under 5 mbar, or that a wrong instrument
key was pressed during the calibration
steps.
Calibration in a Liquid Solution
The sensor can be calibrated in a liquid solution
that has a known concentration of CO
.
2
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Calibration (cont)
Set the gas measurement phase to Dissolved
and set the calibration medium to In a liquid or a
gaseous sample at known concentration.
Press the CAL button. A brief clearing [---]
message appears. Press CAL again within a 3
second period. The instrument then displays the
concentration of gas, based on the last value of
the calibration coefficient.
Modify this reading using the × Ø keys until the
displayed concentration agrees with that of the
calibration solution. Press CAL again.
Start the flow of the standard (calibration) solution
through the flow chamber. Adjust the flow until the
liquid is foam-free. The flow rate should be a
minimum of 150 mL/min. (50% on the 32311 Flow
Meter) and stable. Calibration is successful or in
error, as defined earlier.
Calibration in CO
The sensor can be calibrated in pure CO
at Atmospheric Pressure
2
gas at
2
atmospheric pressure. Set the gas measurement
phase to Gaseous and set the calibration
medium to In measured pure gas at
atmospheric pressure.
Connect a source of pure CO
gas to the inlet of
2
the flow chamber, and adjust the gas flow to one
bubble per second when the exit tube is
immersed in water.
Calibration in CO
at Elevated Pressure
2
This method requires an accurate pressure gauge
connected to the exit of the flow chamber.
Set the gas measurement phase to Gaseous and
set the calibration medium to In a liquid or a
gaseous sample at known concentration.
Connect a source of pure CO
gas to the inlet of
2
the flow chamber, and adjust the gas flow exiting
from the flow chamber to be in the range of 1 to 5
bar (it is best to use a pressure close to the
application conditions).
Press the CAL button. A brief clearing message
[---] appears. Press CAL again within a 3
second period. Calibration is successful or in
error, as defined earlier.
Press the CAL button. A brief clearing message
[---] appears. Press CAL again within a 3
second period. The instrument then displays the
absolute pressure of calibration gas (i.e. gauge
pressure plus atmospheric pressure).
Modify this reading using the × Ø keys until the
displayed pressure agrees with that of the gauge
plus atmospheric pressure. Press CAL again.
Calibration is successful or in error, as defined
earlier.
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Troubleshooting
You may wish to use the Troubleshooting menu
to make sure that the instrument is configured
correctly for your application, and is in good
working order.
The instrument must be connected to your PC to
perform these tests.
SERIAL LINK TEST
Normally, the instrument will inform you of a
disconnected RS-232 (serial) link when
appropriate. However, you can confirm a good
connection using the Serial Link Test option, and
echoing a test message via the instrument.
Enter text characters in the Text to be sent box,
then click Send. If the serial link is operating
correctly, the exact same text will be displayed
back from the instrument in the Echo box.
KEYBOARD TEST
The Keyboard Test option will reveal whether all
the instrument buttons are functioning correctly.
Type a number in the Number box (you may also
select one of three units positions for the LCD's
rightmost indicator bar as well). Then choose
Send. The number and indicator bar placement
should appear on your instrument LCD.
CLOCK SETTINGS
Choose the Clock settings option to set the date
and time in the instrument.
ANALOG VOLTAGES VIEW
The Analog Voltage View option gives a realtime look at voltages used by the system to
transmit information about sensor current,
temperature and pressure. This is useful when
trying to identify an instrument problem with an
Orbisphere service representative either on-site
or over the phone.
Press any one of the instrument's buttons (except
the on/off button) for a full second or more. The
appropriate square on-screen should darken.
DISPLAY TEST
Choosing the Display Test option lets you
perform a one-way communication between
computer and instrument.
Page 10
The voltage limits for normal operation are:
• Current channel: 0.1 V to +4 V
• Temperature channel: +10 mV to +4 V
• Pressure channel: -100 mV to +100 mV
MEASUREMENTS VIEW
The Measurements View option confirms, on
your PC monitor, what your instrument should be
displaying on the LCD for gas concentration and
sample temperature.
Troubleshooting (cont)
The following table lists possible measurement errors.
Symptom Cause Possible Solution
Degassing Adjust sample flow rate
Flow chamber and/or membrane not clean Clean system
Unstable
measurement
Low readings
High readings
Sensor’s membrane not tight smooth and
wrinkle free
Leaking solenoid valve
An external power supply is used but the
power supply is not clean
Sample flow rate too low Check flow rate
Degassing Adjust forcing gas and/or sample flow rate
Membrane is not at sample temperature
Membrane not clean Clean system
Incorrect solubility curve Change solubility
Incorrect calibration Recalibrate
Membrane is not at sample temperature
Incorrect solubility curve Change solubility
Incorrect calibration Recalibrate
Replace membrane and recalibrate
No gas bubbles should escape from the purge gas
outlet during measurement. If the solenoid leaks
(more than 1 bubble in 15 seconds) contact your Orbisphere representative.
Switch to battery power
Allow sample to flow past the membrane to make sure
the membrane is at sample temperature before making measurements
Allow sample to flow past the membrane to make sure
the membrane is at sample temperature before making measurements
The following are warning messages that may appear on the instrument LCD in place of the gas
concentration measurement.
Message Meaning
This message appears on the LCD if the purge gas supply fails. To detect this condition, the voltage
signal from the TC sensor is measured. This is normally between 1-3 volts, depending which gas is
Pur
being measured.
If the flow of purge gas stops, the sensor voltage wanders outside the permitted range of 100mV to 4 V.
This message appears if the sensor is unplugged from its correct position, or if the temperature is
Out
outside the range -5°C to 100°C.
During start-up, this message indicates the instrument cannot complete the start-up tests successfully.
If the problem persists, contact your local Orbisphere service representative for assistance.
Err
During calibration, this message indicates that the partial pressure of gas is below the acceptable range
(<5 mbar), or that you have pressed a wrong key.
Page 11
CAUTION
Sensor Maintenance
CAUTION
CAUTION
Sensor maintenance includes membrane
replacement and external cleaning to restore the
original sensor sensitivity. This means low
running costs and down time reduced to a
minimum.
The membrane needs to be replaced once or
twice a year depending on application conditions.
This can be tailored accordingly.
Periodically, visually inspect the sensor head for
any deposits. Rinse it under clean tap water, and
dry with a clean tissue.
It is recommended to leave the sensor in place in the instrument when changing the membrane.
To remove the membrane, follow the steps below:
To avoid any liquid coming into contact with the TC sensor chip via the purge path, check that
the flow chamber is completely empty of any liquid sample.
Then remove the flow chamber from the sensor by turning the flow chamber locking nut counterclockwise and gently lifting it off the sensor.
A thermistor at the top of the sensor (position No 1 in the
illustration) is used to measure the sample temperature, and
an air duct (position No 2 in the illustration) is used for the
purge gas inlet. Do not bend or damage either of these
components by trying to twist the flow chamber off the sensor.
To verify if the membrane needs to be replaced,
check sensor measurements against a known
standard sample value. If the deviation exceeds
10% of the original value, replace the membrane.
Carry out any maintenance in a clean dry place in
order to avoid damaging the sensor's precision
components, and also to prevent water or
humidity from getting into the sensor.
Page 12
Unscrew the protection cap, using the tool provided in the
maintenance kit.
Never remove the protection cap, unless you plan to replace
the membrane.
Pull up the membrane holding ring with the tool provided in the
maintenance kit.
Remove membrane.
Sensor Maintenance (cont)
Note :
Note :
Note :
CAUTION
The membrane mounting surface must be clean and even (on
top of the sensor, where the membrane and sensor have
contact).
Replace the membrane O-ring on the sensor head with a new
one.
The 29039.0 Nitril O-ring can be reused if it is still in good
condition. Membrane O-rings are part of the protection cap kit.
In the maintenance kit, pick up the two part membrane
mounting tool.
Install the sleeve over the sensor head (end with shoulder
downwards).
Take a few membranes out of the storage box. Using tweezers
included in the kit, pick up one membrane from the stack, and
gently place it on the sensor tip.
Make sure it is centered. If a sensor mask is used, place it
directly on top of the membrane.
Distinguish the membrane from the protection paper:
- The membrane is transparent (translucent)
- The protection paper is opaque
The membrane diameter is larger than the sensor head
diameter. This is normal, as the membrane will fold over the
sensor tip.
Place the membrane holding ring on the installation tool tip.
To avoid damaging the membrane, make sure that the tool tip
is totally clean and its surface is even.
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Sensor Maintenance (cont)
Note :
Note :
Insert the installation tool inside the guiding sleeve.
Push the installation tool firmly downwards. This clasps the
mounting ring onto the sensor head, folding the membrane
over the sensor tip.
Remove the installation tool and guiding sleeve.
Visually check for correct ring placement, try to push it down
with your fingers.
Check that the membrane is tight, with no wrinkles.
Once installed, a membrane cannot be reused. Avoid touching
membranes with bare fingers, as this may affect its sensitivity.
Clean and dry the protection cap ready for installation.
Replace the O-ring inside the protection cap with a new one.
Tighten the protection cap finger tight.
Then, complete the process using the tool provided in the
maintenance kit. Insert into each of the four holes in turn, and
tighten as far as possible. Tighten each hole only once.
The grille inside the protection cap should be free to move
during tightening. Therefore, and to avoid damage to the
membrane, do not touch the grille during the tightening
process.
Finally replace the flow chamber, by gently lowering it onto the
sensor and guiding the thermistor and purge gas air duct on the
sensor into the two holes in the flow chamber base. Turn the
flow chamber locking nut clockwise to secure it in place.
Check that the membrane has not been damaged. The alarm
message [Err] will be displayed on your analyzer if the
membrane leaks in any way.
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