PCE Instruments PCE-DOM Series User manual

© PCE Instruments
PCE-DOM Series Oxygen Meter
User Manual
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Last change: 21 August 2020
v1.0
English

© PCE Instruments
Contents
1Safety notes........................................................................................... 1
2Device description ................................................................................2
2.1 Technical specifications ................................................................................................... 2
2.2 Front side......................................................................................................................... 3
3Operating instructions ......................................................................... 4
3.1 Calibration........................................................................................................................ 4
3.2 Measurement of dissolved oxygen in liquids..................................................................... 5
3.3 Measurement of atmospheric oxygen............................................................................... 6
3.4 Temperature measurement.............................................................................................. 6
3.5 Freezing data in the display.............................................................................................. 6
3.6 Save measured data (MIN HOLD, MAX HOLD) ............................................................... 6
4Maintenance .......................................................................................... 7
4.1 First use........................................................................................................................... 7
4.2 Maintenance of the sensor............................................................................................... 7
4.3 Battery replacement......................................................................................................... 8
5Warranty.................................................................................................9
6Disposal ................................................................................................. 9

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1 Safety notes
Please read this manual carefully and completely before you usethe device for the first time. The
device may only be used by qualified personnel and repaired by PCE Instruments personnel.
Damage or injuries caused by non-observance of the manual are excluded from our liability and
not covered by our warranty.
•The device must only be used as described inthis instructionmanual. If used otherwise,
this can cause dangerous situations for the user and damage to the meter.
•The instrument may only be used if the environmental conditions (temperature, relative
humidity, …) are within the ranges stated in the technical specifications. Do not expose
the device to extreme temperatures, direct sunlight, extreme humidity or moisture.
•Do not expose the device to shocks or strong vibrations.
•The case should only be opened by qualified PCE Instruments personnel.
•Never use the instrument when your hands are wet.
•You must not make any technical changes to the device.
•The appliance should only be cleaned with a damp cloth. Use only pH-neutral cleaner,
no abrasives or solvents.
•The device must only be used with accessories from PCE Instruments or equivalent.
•Before each use, inspect the case for visible damage. If any damage is visible, do not
use the device.
•Do not use the instrument in explosive atmospheres.
•The measurement range as stated in the specifications must not be exceeded under
any circumstances.
•Non-observance of the safety notes can cause damage to the device and injuries to
the user.
We do not assume liability for printing errors or any other mistakes in this manual.
We expressly point to our general guarantee terms which can be found in our general terms of
business.
If you have any questions please contact PCE Instruments. The contact details can be found at
the end of this manual.

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2 Device description
2.1 Technical specifications
Measurement function
Measurement
range
Resolution
Accuracy
Oxygen in liquids
0 ... 20 mg/L
0.1 mg/L
± 0.4 mg/L
Oxygen in the air
(reference measurement)
0 ... 100 %
0.1 %
± 0.7 %
Temperature
0 ... 50 °C
0.1 °C
± 0.8 °C
Further specifications
Cable length (PCE-DOM 20)
4 m
Temperature units
°C / °F
Display
LC display 29 x 28 mm
Temperature compensation
automatically
Memory
MIN, MAX
Automatic power-off
after about 15 minutes
Operating conditions
0 ... 50°C, <80 % RH.
Power supply
4 x 1.5 V AAA batteries
Power consumption
approx. 6.2 mA
Dimensions
180 x 40 x 40 mm (handheld unit without sensor)
Weight
approx. 176 g (PCE-DOM 10)
approx. 390 g (PCE-DOM 20)
2.1.1 Spare parts PCE-DOM 10
Sensor: OXPB-19
Diaphragm: OXHD-04
2.1.2 Spare parts PCE-DOM 20
Sensor: OXPB-11
Diaphragm: OXHD-04

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2.2 Front side
2.2.1 PCE-DOM 10
3-1 Display
3-2 On / Off key
3-3 HOLD key
3-4 REC key
3-5 Sensor with diaphragm
3-6 Battery compartment
3-7 Protection cap
2.2.2 PCE-DOM 20
3-1 Display
3-2 On / Off key
3-3 HOLD key
3-4 REC key
3-5 Sensor with diaphragm
3-6 Battery compartment
3-7 Sensor connection
3-8 Sensor plug
3-9 Protection cap
Attention: The sensor of the PCE-DOM 20 is covered with a red protective cap which
must be removed before measurement!

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3 Operating instructions
When using the meter for the first time, the sensor of the oxygen meter must be filled
with electrolyte solution OXEL-03 and then calibrated.
3.1 Calibration
Before the measurement, the PCE-DOM 10/20 must be calibrated in fresh air. First remove the
grey protective cap from the sensor. Then switch on the test instrument using the on/off key. The
display then shows a measured value and the current temperature:
The upper, large display shows the current measured value. Wait approx. 3 minutes until the
display has stabilised and the measured value no longer fluctuates.

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Now press the HOLD key so that the display shows Hold. Then press the REC key. CAL will
flash in the display and a countdown will start counting down from 30.
As soon as the countdown is finished, the oxygen meter returns to normal measuring mode and
the calibration is finished.
The oxygen meter should now display a measured value between 20.8 ... 20.9 % O2 in fresh
air.
Hint: Calibration works best when performed outdoors and in fresh air. If this is not
possible, the meter can also be calibrated in a very well ventilated room.
3.2 Measurement of dissolved oxygen in liquids
After the calibration has been carried out as described in chapter 3.1, the oxygen meter can be
used to measure dissolved oxygen in liquids.
Press the UNIT key for three seconds to change the unit from %O2 to mg/l. Now place the sensor
head in the liquid to be measured and carefully move the meter (sensor head) slightly back and
forth within the liquid. The measurement result can be read from the display after a few minutes.
Hint: In order to obtain a quick and exact measuring result, the meter must be moved
within the liquid at a speed of approx. 0.2 ... 0.3 m/s. In laboratory tests, it is recommended to stir
the liquid in a beaker with a magnetic stirrer (e. g. PCE-MSR 350).
After the measurement is completed, the electrode can be rinsed withtap water and the protective
cap can be placed on the sensor.

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3.3 Measurement of atmospheric oxygen
After calibration, the oxygen meter can also be used to measure the atmospheric oxygen content.
To do this, set the unit to O2%.
Note: This measurement function gives only an indicative measurement.
3.4 Temperature measurement
During the measurement, the oxygen meter displays the current medium temperature.
To change the unit, press the REC button for at least 2 seconds to toggle the unit between °C
and °F.
Note: This function is not available when the oxygen meter is in memory mode.
3.5 Freezing data in the display
If you press the HOLD key during the measurement, the current display is frozen. The hold icon
then appears in the display.
3.6 Save measured data (MIN HOLD, MAX HOLD)
This function ensures that after activating this function, the minimum and maximum measured
values are saved in the display.
3.6.1 Save maximum value
Press and release the REC key. Then the REC icon appears in the display. When you press the
REC key again, the display shows REC MAX and as soon as the measured value exceeds the
maximum value, the maximum value is updated. If you press the HOLD key, the MAX Hold
function is terminated. Only REC appears in the display.
3.6.2 Save minimum value
If the memory function was activated via the REC key, you can display the minimum measured
value on the display by pressing the REC key again. The display will then also show REC MIN.
Pressing the HOLD key terminates the function and the REC icon appears in the display.
3.6.3 Terminate memory mode
When the REC icon appears in the display, this function can be cancelled by pressing the REC
key for at least two seconds. The oxygen meter then returns to normal measuring mode.

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4 Maintenance
4.1 First use
When using the oxygen meter for the first time, the sensor must be filled with electrolyte solution
OXEL-03 and then calibrated.
4.2 Maintenance of the sensor
If the meter can no longer be calibrated or the reading does not appear stable on the display, the
following points should be considered.
4.2.1 Testing the electrolyte
Check the condition of the electrolyte in the sensor head. If the electrolyte is dry or dirty, the head
should be cleaned with tap water. Then fill the black cap with new electrolyte (OXEL-03) as
described in chapter Fehler! Verweisquelle konnte nicht gefunden werden..

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4.2.2 Maintenance of the diaphragm
The Teflon diaphragm is capable of allowing oxygen molecules to pass through it, this is how the
oxygen meter can measure oxygen. However, larger molecules cause the membrane to clog. For
this reason, the diaphragm should be replaced if the meter cannot be calibrated despite a new
electrolyte. The diaphragm should also be replaced if it has been damaged by an impact.
The procedure for changing the diaphragm is similar to that for refilling the electrolyte.
Remove the blackcap with the diaphragm from the sensor head. Clean the sensor withtap water.
Fill new electrolyte fluid into the new cap with the diaphragm (OXHD-04). Then screw the black
cap back onto the sensor and finally perform the calibration as described in chapter 3.1
4.3 Battery replacement
When the display shows this icon , the batteries must be replaced to ensure proper
operation of the oxygen meter. To do this, open the battery compartment cover of the meter and
remove the old batteries. Then insert new 1.5 V AAA batteries into the meter. Make sure that the
polarity is correct. After the new batteries have been inserted, close the battery compartment.