This manual serves to explain the use of the DO 6+ hand held meter.
This manual functions in two ways: first as a step by step guide to help you
operate the meter; second, as a handy reference guide.
This manual is written to cover as many anticipated applications of the DO 6+
meter as possible. If there are doubts in the use of this meter, please do not
hesitate to contact the nearest Eutech Instruments Authorized Distributor.
Eutech Instruments will not accept any responsibility for damage or malfunction
to the meter caused by improper use of the instrument.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on the part of
Eutech Instruments.
14. RETURN OF ITEMS..........................................................40
Instruction Manual DO 6+
1. INTRODUCTION
Thank you for purchasing the DO 6+. This microprocessor-based handheld
meter is economical and easy to use. It has a large custom LCD (Liquid Crystal
Display) for clear and easy reading.
The DO 6+ offers measurement of dissolved oxygen (DO) as percentage
saturation or concentration. Temperature measurement is also available in
degrees Celsius. The meter ensures accurate measurement of the dissolved
oxygen values through its temperature, barometric pressure and salinity
compensation features.
Meter kits include a dissolved oxygen probe, refill solution, a rubber armour /
stand, 4 alkaline “AAA” batteries, instruction manual, and warranty card. For
additional information, see Section 11 — REPLACEMENTS AND ACCESSORIES.
Please read this manual thoroughly before operating your meter.
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Instruction Manual DO 6+
2. GETTING STARTED
2.1 Description of Keypad Functions
Your meter has 6 keys on its splash-proof keypad.
Some buttons have multiple functions depending
on the mode of operation.
ON/OFF Powers meter on and off. Meter starts
CAL Enters into calibration mode. Pressing
MODE Selects desired measurement mode.
HOLD Freezes measured reading. Press again to resume live reading.
ENTER Confirms calibration value in calibration mode and confirm selections
up in the measurement mode that you
last switched off from.
while in calibration mode will abort
calibration without confirming value.
When pressed simultaneously with
ON/OFF, it will take you into the SETUP mode.
For more information see Section 5 — SETUP.
in SETUP mode.
Increment/decrement values during calibration mode or scroll through
SETUP menus. Set offset adjustments and configuration settings.
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Instruction Manual DO 6+
r
2.2 Description of LCD Annunciators
Your meter has a large custom LCD that consists of 4-digit segments plus
annunciators for percentage saturation (%), concentration (mg/L or ppm) and
Temperature in degrees Celsius (T).
Other annunciators include “A” (when the ATC function is activated), “CAL”
(when meter is in calibration mode) and low battery condition.
Calibration Mode
Annunciator
Low Battery annunciato
Temperature Mode
CAL
14-segment Liquid Crystal Display
Active LCD display for DO 6+
TA
mg/l
ppm
A T C annunciator
milligram per litre
(Concentration Mode)
parts per million
%
Percentage
(Percentage Saturation
Mode)
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Instruction Manual DO 6+
2.3 Inserting & removing the rubber armour / stand
1. To remove meter from rubber armour, push out from the bottom edges of
meter until it is completely out of boot. Ensure that your electrode cables
are not connected. See Figure 1.
2. To insert meter into armour, slide in from the top of meter before pushing
the bottom edges of meter down to set it into position. Lift up the stand at
the back of meter for bench top applications if necessary. See Figure 2.
Ing New Batteries
Figure 1 Figure 2
2.4 Inserting New Batteries
The battery compartment is found at the back of instrument. To open the battery
compartment, push in the direction of arrow and lift up the cover. Note the
polarity of battery before inserting into position. After replacement, place cover
back and press down until it locks.
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Instruction Manual DO 6+
2.5 Battery Replacement
A low battery annunciator in the LCD alerts you when battery power is running
low. Caution: Power off the meter before replacing battery.
%
Low Battery Condition
2.6 Connecting the Electrode
1) To connect the electrode, align the connector slots with the posts of
meter’s socket and rotate connector clockwise until it locks.
2) To remove, rotate the connector in anti-clockwise direction until it
unlocks, and slide the connector off the socket.
3) Insert the mini phono jack of temperature sensor into the socket on the
meter as shown below.
2.5 mm mini phono
BNC connector
for temperature
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Instruction Manual DO 6+
2.7 Electrode Information
The DO 6+ includes a galvanic DO electrode
(93X233912) which doesn’t require warm-up. It
generates a millivolt signal proportional to the
amount of oxygen in the solution.
The electrode has a dual cable; a BNC connector
for DO measurement and a phono jack plug for
temperature. The sensor utilizes a cathode,
anode, and electrolyte that are separated from
the sample by an oxygen permeable membrane.
The membrane is pre-assembled for you and
fixed to a detachable cap. The pre-assembled
cap design allows simple replacement and fast
conditioning.
The probe is light weight and includes a built-in
temperature sensor. The epoxy body of the probe
is 12mm diameter while the detachable Noryl cap
is 16mm diameter. The compact sensing area
12 mm
reduces air entrapment resulting in quick,
accurate, and stable readings.
The pre-assembled cap must be completely
submersed to obtain an accurate reading in
Detachable
Pre-membraned Cap
(Probe Sensing Area)
solutions. Provide simple stirring for best
results—ideally achieve a minimum water flow
rate of 2 inch/second on the membrane. The
probe is not recommended beyond 0 to 50 °C.
Shaking will aid to remove bubbles if needed
16 mm
before taking a reading. When calibrating in air,
shake to remove water from the membrane.
The membrane is thin and can not be repaired if
Galvanic DO probe
(93X233912)
damaged. Use care to protect from scratches,
abrasion, or contact with solids. For best results
keep membrane clean by rinsing after daily use.
See Section 6 – PROBE MAINTENANCE.
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Instruction Manual DO 6+
ON
2.8 Switching the Meter On
OFF
CAL 13 CAL 24
Press ON/OFF to power up your meter. Your meter will
cycle through various setup parameters when switched on.
1) All LCD segments will briefly illuminate.
2) The model [DO 6+] will display next along with mg/l,
ppm, and % annunciators.
3) Next, the meter revision number [r #.##] is shown
briefly before beginning measurement.
4) The meter begins with the measurement mode that
was in use when it was previously powered off⎯%,
mg/l, ppm, or T.
TAvg
mg/l
NTU
ppm
%pH
mg/l
ppm
%
A
2.9 Changing Mode
%
Press MODE to switch between percentage saturation (%), concentration
(mg/L)(ppm), and temperature (T) measurement.
MODE
MODE
MODE
A
%
A
mg/l
TA
Automatic Temperature
Compensation
Percentage Saturation
Concentration Mode
Temperature Mode
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Instruction Manual DO 6+
3. CALIBRATION
3.1 General Information
The DO 6+ has three measurement modes; DO as % saturation, DO as mg/L
(or ppm) concentration, and temperature.
Dissolved oxygen levels vary with temperature, barometric pressure, and
salinity, so calibration must be performed with consideration of these factors. It
is necessary to set the proper temperature, barometric pressure and
salinity values prior to performing any DO calibration or measurement.
See Section 3.2 — Temperature Calibration
See Section 5.2 — Automatic Temperature Compensation.
See Section 5.9 — Pressure & Salinity Adjustment.
The DO 6+ will accept two % saturation calibration points; 100% using
saturated air or air-saturated water, and 0% using zero oxygen solution. When
100% calibration is performed, the corresponding concentration is adjusted
simultaneously. Therefore, it is not necessary to calibrate the concentration
mode. If calibrating for 0% oxygen, note that the meter will take several minutes
to reach 0% saturation value and constant stirring is not required.
The following table lists calibration values in % saturation calibration mode with
two different barometric pressures. Note that the saturation value (92.1%) has
decreased due to the lower barometric pressure entered.
% Saturation (per
factory default value)
less than 10% 0% 0%
10.1% to 49.9% Err.1 (error 1) Err.1 (error 1)
50% to 200% 100% 92.1%
Calibration Value
(760mmHg)
Calibration Value
(700mmHg)
If calibration is attempted from 10.1% to 49.9%, the “Err.1” message is shown—
calibration is rejected and the display will return to measurement mode.
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Instruction Manual DO 6+
The DO 6+ will accept one calibration point in concentration mode. The
minimum value is 2 mg/L (ppm), and the calibration window is +/- 40% of the
factory default value.
Temperature and % saturation calibration should take place before attempting
to perform mg/L (ppm) concentration calibration.
Calibration of the concentration mode will only replace the previous
concentration calibration and does not affect the % saturation calibration.
To offset your % saturation reading to match another instrument, see Section
5.8 — % Saturation Offset Adjustment.
New calibration values will automatically override the existing data. Perform
daily calibration for best results. To completely recalibrate the meter and when
installing a replacement electrode, it is best to clear all calibration data. See
Section 5.7Reset to Factory Default.
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