ALAT UJI OMEGA DOH-SD1 User manual

DOH-SD1
Disolved Oxygen Meter
With Data Logging SD Card

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TABLE OF CONTENTS
Introduction .................................................................................................................................... 2
Key Features .................................................................................................................................. 2
Operating Instructions .................................................................................................................... 3
What’s in the case ............................................................................................................... 3
Setup .................................................................................................................................... 4
Calibrating the oxygen probe ............................................................................................ 6
Normal operation ............................................................................................................... 8
Holding and storing measurements .................................................................................... 9
Automatic vs. manual datalogging ..................................................................................... 9
Transferring data from the SD card to a computer .......................................................... 10
Specifications ............................................................................................................................... 12
Maintenance & troubleshooting tips ............................................................................................ 13
Replacement parts & accessories ................................................................................................. 14
1. FEATURES
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]

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INTRODUCTION
Thank you for purchasing DOH-SD1 Dissolved Oxygen Meter with Datalogging SD Card.
Please read this user’s manual carefully and thoroughly before using the instrument.
Many commercial and industrial processes carefully monitor the concentration of oxygen
contained in water because dissolved oxygen (DO) level is an excellent indicator of water
quality. For example, if the DO level of a body of water remains too high or too low for too long,
fish and other aquatic organisms will die or become more susceptible to disease. For quality
control purposes, many industries other than fish farming and water pollution control routinely
measure and keep track of the DO levels of their process streams in real time. Among them are
food processing, photography, pulp and paper manufacturing, power generation, electroplating
and facilities management.
The DOH-SD1 has all of the features needed by an instrument suitable for precision
measurement of DO levels in a wide range of applications. Its 7.5-inch-long, polarographic,
electrolyte-filled oxygen probe measures not only the DO concentration of a liquid, but the
liquid’s water temperature as well. The meter uses a single custom microcontroller to display
readings from 0 to 20 milligrams/liter (mg/L) with a resolution of 0.1 mg/L and an accuracy of ±
0.4 mg/L.
Because it is microprocessor-based, the DOH-SD1 can make full use of the portability, reliability
and large storage capacities that SD memory cards offer. Measurements can be made
automatically at any sampling rate between one second and nine hours. After the instrument
time-stamps and stores the measurements on an SD card plugged into it (a process called
datalogging), the user can remove the card and plug it into a laptop or desktop computer either
directly or via a USB card reader. The data logs are stored on the card as files with the .xls
extension that can be opened by Microsoft’s Excel application.
The DOH-SD1 has a backlit 1.5 x 2.0-inch display and is powered by six AA Alkaline batteries
or an optional 9-VDC AC adapter.
KEY FEATURES
•Uses heavy-duty polargraphic oxygen probe
•Precisely measures DO from 0 to 20 mg/L, as well as liquid temperature
•Easy to calibrate
•Supports automatic and manual datalogging
•Time-stamps and stores measurements on SD memory cards
•Sampling time settable from 1 second to 9 hours
•Automatically compensates for altitude and salt content of liquids
•1.5 x 2.0-inch backlit liquid crystal display
•Powered by six AA batteries or optional 9-VDC adapter
•Readings switchable between degrees F and C
2. SPECIFICATIONS

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OPERATING INSTRUCTIONS
What’s in the case
The DOH-SD1 comes fully assembled in a hard carrying case along with the following
accessories:
•An oxygen probe
•Electrolyte to fill the probe
•Two spare probe heads with diaphragm set
•A 2 GB SD memory card
•This user’s manual
Fig. 1 shows all of the controls and indicators on the front, back, top, bottom and side of the
DOH-SD1. Familiarize yourself with their position and function before moving on to the
setup/calibration procedure.
1. The controls and indicators and other physical features of the DOH-SD1

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[CALLOUTS FOR FIG. 1]
1-1 Liquid-crystal display
1-2 POWER button (also controls backlight)
1-3 HOLD/ESC button
1-4 REC/ENTER button
1-5 ▲button
1-6 ▼button
1-7 TIME button
1-8 LOGGER SET button
1-9 Kickstand
1-10 Battery compartment cover
1-11 Battery compartment cover screws
1-12 Tripod attachment nut
1-13 Socket for DO probe
1-14 Socket for 9V AC/DC adapter
1-15 RESET button
1-16 RS-232 output jack
1-17 SD card socket
Setup
1. Choose the power source. Before using the DOH-SD1, be sure it is powered by fresh
batteries or an optional 9VDC AC adapter plugged into the bottom jack on its right side
(callout 1-14).
To remove the battery compartment cover, remove the two screws holding it in place (callout
1-11). Then install six AA batteries in the correct orientation, using the polarity marks on the
inside of the compartment as a guide. Replace the cover by replacing the two screws.
2. Install an SD card. To prepare for setup, also install the supplied 2 GB SD memory card
or another card with a capacity from 1 GB to 16 GB in the socket on the bottom of the
DOH-SD1 (callout 3-17). When installing the card, make sure its gold contacts are facing
front and push the card into the socket until you hear a click. To remove the card, push it
in until you hear a click and the card pops out.
Now power on the instrument by pressing the POWER button (callout 1-2) to generate a short
beep. (To power off the DOH-SD1, press the POWER button and hold it until the instrument
responds with a long beep.)
When the meter powers on, a series of transient startup screens will briefly appear. Once the
display has stabilized, perform the following ten setup steps in the order presented.
3. Format the SD card. Press the LOGGER SET button (callout 1-8) and hold it for at least
five seconds, until “Sd-F” appears in the lower half of the display. Quickly (within three
seconds) press the REC/ENTER button.

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(If you press buttons too slowly in setup mode, the screen will revert to the normal display. To
return to the setup sequence, press and hold the LOGGER SET button again. To move ahead to
the next field in the sequence or to the next parameter, press the HOLD/ESC button.)
Pressing the REC/ENTER button causes the word “no” or “yES” to appear over the term
“Sd-F”. Press the ▼button to make a selection. Choose “yES” whenever a new SD card
is being used, or when a used card is being repurposed (from use with another SD card
instrument or a camera, for example) and all data on it is to be erased. Choose “no” to
preserve any data on a card previously used with this instrument.
If you choose “yES”, after you press the REC/ENTER button the instrument will prompt
you to confirm that decision by displaying the term “Ent” below “yES” and sounding
three beeps. To confirm that you want to begin the erasure/formatting procedure, press
the REC/ENTER. “Ent” will then flash several times and the instrument will sound
another three beeps to confirm that the SD card has been erased and formatted.
4. Set the date and time. Once the SD card has been set up, the word “dAtE” will appear in
the center of the display, along with the flashing value “00.00.00” at the lower left, above
“yy.mm.dd”. Set the current year by pressing the ▼or ▲button repeatedly until the
correct value appears above “yy”. Press the REC/ENTER button to store the setting. The
next screen that appears will have the value above “mm” flashing. Use the ▼or ▲button
to navigate to the current month and press the REC/ENTER button to store the setting.
When the next screen flashes the value above “dd”, again use the ▼or ▲button to
navigate to the current day and press the REC/ENTER button to store the setting.
Once you have set the date, the display will prompt you to set the hour, minute and second of
the current time. Again use the ▼or ▲buttons to navigate to the correct values, and the
REC/ENTER button to store the settings.
5. Set the datalogging sampling time. Once the date and time have been set and stored, the
display will show a value below the letters “SP-t”. Press the ▼or ▲button to decrease or
increase the flashing hour value until the desired number appears below “SP-t”. Press the
REC/ENTER button to store that setting. The minutes value will then flash. Press the ▼
or ▲button to decrease or increase the value and then press the REC/ENTER button to
store that setting. Finally, press the ▼or ▲button to decrease or increase the flashing
seconds value and then press the REC/ENTER button to store that setting.
6. Enable or disable auto power off. Once the sampling time has been set and stored, the
display will show the word “yES’ over the term “PoFF”. Press the ▼button until the
desired automatic power off management scheme (“yES” for enable; “no” for disable) is
displayed. Press the REC/ENTER button to store the selection. If enabled, the power off
function shuts off the DOH-SD1 after a period of inactivity of ten minutes.
7. Enable or disable the beeper. Once the auto power off function has been enabled or
disabled, the display will show the word “yES” over the word “bEEP”. Press the ▼
button until the desired setting (“yES” or “no”) is displayed, and then press the
REC/ENTER button to store the selection.

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8. Choose a decimal point or comma to represent the decimal division between integers
and fractions (for example, American-style 20.88 vs. European-style 20,88). Once the
beeper has been enabled or disabled, the display will show the word “bASIC” above the
phrase “dEC”. Press the ▼button to make “bASIC” (American style) or “Euro” appear
in the upper display, as desired. Press the REC/ENTER button to store the selection.
9. Select the temperature unit. Once the format of decimal divisions has been set and
stored, the display will show the term “t-CF”. Press the ▲or ▼button until your
preferred unit—degrees Fahrenheit (oF) or degrees Celsius (oF)—is displayed. Then press
the REC/ENTER button to store the setting as the default.
10. Compensate DO measurements for the presence of salt in the liquid. Once the
temperature unit has been selected and stored, the term “SaLt” will appear in the lower
portion of the display. Press the ▲or ▼button repeatedly until the reading in the upper
portion of the display matches the known percentage of salt in a liquid sample. Then
press the REC/ENTER button to store this value as the temporary default (until the
instrument is powered off).
11. Compensate DO measurements for altitude in meters. Once DO measurements have
been compensated for salt, the term “High-” will appear in the lower portion of the
display. Press the ▲or ▼button repeatedly until the reading on the upper portion of the
display matches your altitude in meters. Then press the REC/ENTER button to store this
value as the temporary default.
12. Compensate DO measurements for altitude in feet. Once DO measurements have been
compensated for salt, the term “Highf” will appear in the lower portion of the display.
Press the ▲or ▼button repeatedly until the reading on the upper portion of the display
matches your altitude in feet. Then press the REC/ENTER button to store this value as
the temporary default.
Once the altitude compensation in feet has been set and stored, the display will then either return
to the first of the ten steps in the setup sequence--choosing whether or not to format the SD
memory card—or show the term “ESC”. If “ESC” appears, press the HOLD/ESC button to exit
the setup procedure and enter normal operating mode. In this mode, the display will show
“mg/L” units by default.
Calibrating the oxygen probe
The DOH-SD1’s oxygen probe must be calibrated before you use it for the first time, and again
before each use after a long period (weeks or months) of sitting idle. Omega also recommends
calibrating the probe before making any measurements that must be extremely precise.
Before calibrating the probe, make sure that it is full of fresh electrolyte. Use the following
procedure—while referring to Fig. 2—either to fill the probe with electrolyte or to replace old
electrolyte with fresh electrolyte.
1. Unscrew the probe head from the probe handle.
2. Empty and dispose of any residual electrolyte from the probe head’s reservoir.
3. Pour fresh electrolyte into the reservoir.

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4. Screw the probe head back into the probe body.
2. How to fill the probe head with electrolyte
To calibrate the DOH-SD1, use the following procedure while referring to Figures 1 and 3:
[CALLOUTS FOR FIG. 3]
3-1 Probe Plug
3-2 Probe Handle
3-3 Temperature-sensing Metal
3-4 Probe Cap
3-5 Probe Head Protective Cover
3. The probe’s main components

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5. Plug the probe plug into the DO probe socket at the top of the DOH-SD1.
6. Power on the instrument by pressing the POWER button on the front panel once.
(Powering the unit through a 9V AC/DC adapter—an optional accessory—disables the
POWER button.)
7. Press the ▼button (which has the word “Function” stenciled above it) once; the display
will then show “%O2” instead of “mg/L”.
8. Wait at least five minutes until the display readings stabilize.
9. Use two fingers to press the REC/ENTER and HOLD/ESC buttons at the same time.
Release your fingers once the display shows the following (indicating that air typically
has an oxygen content of 20.9%):
20.9
CAL
10. Press the REC/ENTER button. The display will then count down from 30 seconds to 0.
When the countdown is complete, press the Function ▼button once to return to the
normal display of “mg/L”
Normal operation
1. To measure the percentage of oxygen dissolved in a liquid:
•Make sure that the probe is full fresh electrolyte and has been calibrated recently.
•Remove the protective cover from the probe head.
•Plug the probe plug into the DO probe socket at the top of the instrument.
•Power on the DOH-SD1 by pressing the POWER button on the front panel once.
•Insert the probe at least 4 inches (10 cm) into the liquid to be measured.
•Wait a few minutes for the instrument to automatically compensate for any difference
in temperature between the probe and the liquid.
•Read the DO content of the liquid in mg/L on the upper display and its temperature
on the lower display.
•Rinse the probe head with tap water after each measurement.
•Replace the probe head protection cover.
2. To measure the oxygen content of a volume of air, first make sure that the oxygen
probe is full of fresh electrolyte, calibrated and correctly inserted, and that the meter is
powered on. Then press the ▼button (which has the word “Function” stenciled above it)
to make the display show “%O2” instead of “mg/L”. Wait at least five minutes until the
readings stabilize. To return to “mg/L” readings, press the ▼button again.
Whenever the DOH-SD1 is in measurement mode, you can turn off the backlight (which is on by
default) by briefly pressing (but not holding) the POWER/ESC button. To reactivate the
backlight, briefly press the button again.
A DO measurement tip
Agitating the liquid reduces the effect and measurement errors caused by oxygen
diffusing into the liquid from ambient air. At a minimum, this can be done by
shaking the probe while it is immersed. To minimize measurement errors of this
type, Omega recommends using a magnetic agitator, especially in laboratory
settings.

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Whenever the instrument is in measurement mode, you also can check the current date and time
by briefly pressing the TIME button. Doing so causes both values to appear briefly at the lower
left of the display.
Holding and storing measurements
1. To hold a measured value, press the HOLD/ESC button during the measurement. Doing
so will cause the word “HOLD” to appear at the top of the display. Pressing the
HOLD/ESC button again releases the hold.
2. To record and recall readings, press the REC/ENTER button while making
measurements. This will make the term “REC” appear at the top of the display. Pressing
the REC/ENTER button again, briefly, will make the term “MAX” appear to the right of
“REC” and switch the display to the maximum value stored in memory during the last
recording session. Pressing the REC/ENTER button again, briefly, will make the term
“MIN” appear to the right of “REC” and switch the display to the minimum value stored
during the last session.
3. To exit recording mode, press and hold the REC/ENTER button for at least three
seconds, until the term “REC” disappears from the top line of the display. The display
will then revert to showing the current reading.
Automatic vs. manual datalogging
The DOH-SD1 can automatically log data at a user-selected sampling period from 1 second to 9
hours. To view the sampling time for which the instrument was set up, press the LOGGER SET
button (which has the words “Sampling check” stenciled below it) once. To change the sampling
time, perform Step 5 of the setup procedure.
1. To start automatic datalogging, press the REC/ENTER button once. The top line of the
display will then show the term “REC”. Pressing the LOGGER SET button at this point
will make REC flash and add the flashing term “LOGGER” at the top right of the
display. This indicates that the instrument is currently storing measured values and their
time stamps in memory.
2. To pause automatic datalogging, press the LOGGER SET button once; this action
makes the flashing term LOGGER disappear from the top right of the display and
changes the term “REC” from flashing to constant. Pressing the LOGGER SET button
again resumes automatic datalogging.
3. To end automatic datalogging, press the REC/ENTER button and hold it for at least
two seconds. This action causes the “REC” message to disappear.
4. To log data manually, set the sampling time to zero using Step 5 of the setup procedure.
Then press the REC/ENTER button once. The display will show the term “REC” on the
top line, a value in the middle, and below it the letter “P” on the left and a number from 1
to 99 on the same line to the right. The number indicates the position on the SD card that
will be used to store manually logged data.
Now press the LOGGER SET button. This will cause the beeper to sound [even if disabled?
Engineering, pls check]and the term “LOGGER” to briefly appear at the upper right of the

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display. As in automatic datalogging mode, in this mode the instrument is storing
measurements and their time stamps on the SD card.
In manual datalogging mode, however, measurements are being stored continuously (with a
sampling time of zero), and their locations on the card can be changed.
5. To change the storage location of manually logged data, press the ▼button once; this
causes the “P” to disappear from the left side of the display and the value on its line to
begin flashing. Once the flashing begins, you can use the ▼and ▲buttons to change the
flashing value to any number between 1 and 99. Once you have chosen the storage
location, press the REC/ENTER button to save the setting. This causes the value to stop
flashing and the “P” to return.
6. To end manual datalogging, press the REC/ENTER button and hold it for at least three
seconds. This action causes the “REC” message to disappear from the top line of the
display.
Transferring data from the SD card to a computer
After automatic or manual datalogging of measurements, remove the SD card from the DOH-
SD1 and plug it into your computer either directly (if it has an SD card slot) or through an SD
card reader.
Because the files containing time-stamped data logs have the extension .xls, they open in
Microsoft’s Excel application. Figures 4, 5 and 6 show three kinds of Excel presentations: a data-
only screen, a graphics-only screen, and a screen that mixes both types of content.
4. Typical Excel data-only screen

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5. Typical Excel graphics-only screen
6. Typical Excel mixed graphics/data screen

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SPECIFICATIONS
Embedded microcontroller Custom single-chip LSI device
Display type Liquid-crystal with green backlight
Display size 2.0 x 1.5 inches (52 x 38 mm)
DO measurement range 0 to 20 mg/L
DO measurement resolution 0.1 mg/L
DO measurement accuracy ± 0.4 mg/L
Oxygen in air measurement range 0 to 100%
Oxygen in air measurement resolution 0.1% O2
Oxygen in air measurement accuracy ±0.7% O2
Temperature measurement range 32 to 122 oF (0 to 50oC)
Temperature measurement resolution 0.1 oF or C
Temperature measurement accuracy ±1.5 oF (±0.8 oC)
Compensation for temperature Automatic
Compensation for altitude 0 to 29,200 ft (0 to 8,900 meters)
Compensation for liquid salt content 0 to 50%
Datalogging sampling time range 1 second to 8 hours, 59 minutes, 59 seconds
DO probe type Polarographic
SD memory card capacity 1 GB to 16 GB
Power supply Six Alkaline AA batteries or 9-VDC adapter
Power consumption 14 mADC (normal operation, with backlight off and
SD card not saving data); 37 mADC with backlight
on and card not saving data; 49 mADC with
backlight on and card saving data
Operating temperature 32 to 122 oF (0 to 50oC)
Operating relative humidity 0 to 85%
Dimensions of meter dimensions 7.0 x 2.7 x 1.9 inches (177 x 68 x 45 mm)
Weight of meter 1.08 lb (489 g)
Dimensions of probe 7.5 (long) x 1.1 (across) inches (190 x 28 mm)
Weight of probe 0.74 lb (335 g)

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MAINTENANCE & TROUBLESHOOTING TIPS
Keep the probe clean and its head inside the included protective cover when not in use.
If the meter cannot be calibrated, or if its readings are erratic, first make sure that the probe head
contains enough fresh electrolyte. To fill the head with electrolyte, follow the instructions in the
“Calibrating the oxygen probe” section. If that doesn’t solve the problem, replace the probe
head/diaphragm set. In either event, the next step should be to recalibrate the probe.
When the icon appears in the left corner of the display, it’s time to replace the six AA
batteries that power it (although measurements will remain valid for several hours after the low-
battery indicator first appears). Replacing the batteries requires removing the screws that hold the
battery compartment cover in place. After inserting fresh batteries in the correct orientation,
tighten the screws to secure the cover.
If the meter “freezes” (like a computer) and buttons become unresponsive, try resetting the
instrument by pushing the RESET button on its right side (callout 1-15 of Fig. 1) with the end of
a paper clip.
Remove the battery when storing this product for an extended period of time.
Do not drop or disassemble the instrument or immerse it in water.
RS232 PC

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REPLACEMENT PARTS & OPTIONAL ACCESSORIES
•DOE-SD1 Spare oxygen probe
•DOEH-SD1 Spare probe head and diaphragm set
•DOEL-SD1 Electrolyte for probe
•APAPTER-ST 9-VDC adapter for 110VAC power supply
•RS232-SD RS232 Cable

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NOTES:

NOTES:
Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: [phone] (Hunting) Fax: [phone]
Mobile: [phone]
Fax: [phone]