PEAK INSTRUMENTS P-512 User manual
User Manual PEAK INSTRUMENTS INC
Address: 16223 Park Row, Houston, TX-77084, USA. Website: www.peakii.com. Tel: +1 2819353455
CONTENTS
I. General Information....................................................................................................1
II. Specifications .............................................................................................................2
III. Device Instructions....................................................................................................3
1. Display indicators ................................................................................................3
2. Operation Keys....................................................................................................3
3. Save, view and delete data. ................................................................................4
IV. DO Measurement......................................................................................................5
1. Preparations........................................................................................................5
2. Calibration...........................................................................................................5
3. Liquid sample measurement...............................................................................6
4. Notices ................................................................................................................6
5. Parameter settings..............................................................................................7
5.1. Table of parameter setup..........................................................................7
5.2.1. Resolution setting(P1)............................................................................7
5.3. Manual temperature compensation(P2). .................................................8
5.4. Salinity compensation(P3) ........................................................................8
5.5. Air pressure setting(P4).............................................................................8
5.6. Temperature unit setting(P5)....................................................................9
5.7. Auto shutdown timer of backlight(P6)......................................................9
5.8. Auto shutdown timer of the device(P7) ...................................................9
5.9. Restore default settings(P8)....................................................................10
6. Change diaphragm cap......................................................................................10
7. Zero oxygen calibration.....................................................................................10
8. Salinity setting...................................................................................................11
9. Air pressure setting...........................................................................................11
VI. Packing List..............................................................................................................12
Appendix I Saturated content of oxygen in water with different temperature......12
Appendix II Saturated content of oxygen in water with different air pressure ......13
Appendix III Saturated content of oxygen in water with different altitude............14
User Manual PEAK INSTRUMENTS INC
Address: 16223 Park Row, Houston, TX-77084, USA. Website: www.peakii.com. Tel: +1 2819353455
1
I. General Information
Thanks for using P-512 DO meter. In order to help you operate and maintain the
instrument properly, please read the user manual before using it. We reserve the rights
to update the manual and its parts subject to the purpose of improving the
instrument’s performance.
This instrument combines the technologies of advanced electronics, sensors and
software design, which can be used to test the dissolved oxygen, temperature and
other parameters of water solutions. This DO meter is very suitable for industrial and
mining enterprises, power plant, environment protection, etc. Especially suitable for
outdoor purpose.
This pH meter has built-in microprocessor chip with beautiful design, variable
functions and the following features:
1. Built-in microprocessor chip, with automatic calibration, automatic or manual
temperature compensation, data storage, function settings, automatic shutdown and
low voltage alarm and other intelligent functions. Easy to use.
2. Digital filtering and slip techniques are used to improve meter’s response speed and
data accuracy. The symbol of “ ” is displayed when the measured value is stable.
3. Equipped with new type of dissolved oxygen electrode and temperature probe with
automatic temperature compensation, manual salinity compensation and air pressure
compensation, which make the measurement more accurate and operation easier.
4. Polarographic electrode only needs 3-5 mins to be polarized and adopts combined
diaphragm cap design and with three additional caps, which make the cap change
much easier.
5. The circuit board adopts Surface Mounted Technology to improve the reliability of
product processing.
6. White backlit LCD screen.
7. IP57 waterproof and dustproof.
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II. Specifications
Dissolved oxygen
Measuring range
(0～20.00)mg/L(ppm), (0～200.0)%
Resolution
0.1/0.01 mg/L(ppm), 1/0.1%
Accuracy
Electrode:±0.10 mg/L
Instrument: ±0.40mg/L
Response time
≤30s (25℃,90% response)
Residual current
≤0.1 mg/L
Temperature
compensation
(0～99)℃(Auto/Manual)
Salinity compensation
(0～45)ppt(Manual)
Air pressure
compensation
(0～200) kPa(Manual)
Automatic calibration
Air saturated with water, water saturated with air
Electrode type
Polarographic
Other Parameters
Data Storage
150 sets
Storage Contents
Series number, measuring value, unit,
temperature and time
Power
Two pieces of AA battery
Size & Weight
165×90×32 mm/310g
Certificates
ISO9001:2000, CE
Working Conditions
Ambient Temperature
5～35℃
Humidity
≤85%
IP Rating
IP57
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III. Device Instructions
1. Display indicators
① Parameter mode tag
② Measurement value
③ Data storage and replay number and symbol. Indicator of special status. M+ is
symbol for data storage. RM is data replay icon.
④ Measurement unit
⑤ Temperature and unit
⑥ Stability symbol
⑦ Calibration indicators
⑧ Low voltage symbol, when the voltage is lower than 2.6V, the symbol will be shown
to remind customer for battery change.
2. Operation Keys
There are seven operating buttons
2.1. On/off button, it is used to switch on/off the device in measuring mode.
This key is not working in other modes.
2.2. Calibration key.
2.2.1. Press this button to enter calibration mode in measuring mode.
2.2.2. Press this key to back in other modes.
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2.3. Function key. In measuring mode, short press(less than 1.5 seconds) this
key to change measuring unit mg/L→ppm→%.
2.4. Backlight and delete key.
2.4.1. In measuring mode, short press(less than 1.5 seconds) this key to turn on or off
backlit.
2.4.2. When viewing saved data, long press(more than 5 seconds) this key to delete
saved data.
2.5. Increase and data view key. Decrease and data saving key.
2.5.1. In measuring mode, short press(less than 1.5 seconds) to save records,
short press(less than 1.5 seconds) to view saved records.
2.5.2. and are used to change parameters under setting mode.
2.6. Set and Confirm/return key
2.6.1. In measuring status, long press(more than 2 seconds) to enter parameter
settings.
2.6.2. Short press(less than 1.5 seconds) to confirm current selection in other status.
3. Save, view and delete data.
3.1. Data save. In measuring status, when the reading is stable and shows symbol ,
short press(less than 1.5 seconds) to save records, the screen will show “M+”
and storage number. The device can save 150 sets of records totally.
3.2. Data view.
3.2.1. In measuring status, short press(less than 1.5 seconds) to view the
newest saved record of the current unit, and right upper corner will show symbol “RM”.
Continue press or to replay all saved records.
3.2.2. In view status, press to return to measuring mode.
3.3. Delete data
In data viewing mode, long press (more than 5 seconds) and screen displays
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for two seconds, which means all saved data is deleted already and back to
measuring mode.
IV. DO Measurement
1. Preparations
1.1. Press to switch on device, then press to choose proper unit.
1.2. Check the DO electrode (see following fig.).There should not be bubbles inside the
electrode diaphragm cap (tiny bubble is OK). Otherwise, rotate off the cap and refill it
with electrolyte and install the cap back, connected to instrument and be polarized for
15 minutes.
1. Diaphragm cap
2. DO electrode
3. Anode
4. Cathode (gold film)
5. Temperature electrode
1.3. Connect the DO electrode and temperature electrode to the interfaces at the back
of instrument.
2. Calibration
2.1. Press to enter calibration mode, the screen will show “CAL” at top right
corner to indicate entering calibration mode. Put DO electrode in the air vertically for
3-5 minutes until tested value stable and display symbol “ ”, then press key
and shows 100%. If the reading is not stable, please wait for a few minutes and press
enter calibration mode until reading is table.
2.2. After the calibration, the screen will show “ ” which means 0% oxygen
calibration is done or “ ” means 100% oxygen calibration is finished.
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3. Liquid sample measurement
3.1. Measuring flow liquid solution(flowing speed >5cm/s). Dip the electrode into the
liquid with the temperature probe under water surface. Tilt the electrode 45°～
75°with the flow direction, shake it slightly and last 3-5 minutes until the reading is
stable.
3.2. Measuring static liquid solution. Dip the electrode into the liquid with the
temperature probe under water surface. Tilt the electrode 45°～75°with the water
surface, move it with speed more than 5cm/s and last 3-5 minutes until the reading is
stable.
3.3. Measuring low flowing speed liquid. Please refer to 3.1 and move the electrode
faster.
4. Notices
4.1. The difference between air temperature and tested solution temperature should
be less than 10℃, if the difference is too big, the electrode should be immersed in the
solution to be tested for 10 minutes. Then calibrate it according the steps mentioned
above.
4.2. Don’t turn off the instrument during use because the electrode should be
polarized and calibrated when it is turned on.
4.3. Temperature has strong impact on DO value. Because the temperature electrode
is installed in the shell and contact directly with water instead of being installed in
electrolyte inside the electrode, which will cause different ability to induce the liquid’s
temperature and need 3-5 minutes to reach a balance. So the reading time should be
more than 3 minutes, otherwise, there will be a bigger error. Especially in case of big
temperature difference between electrode and tested liquid, the reading time should
be longer.
4.4. Air pressure has great influence on DO test(see appendix II and III). This DO meter
has manual pressure compensation function, which can amend the tested value and
make sure its accuracy.
4.6. There should not be bubbles on the sensitive membrane of DO electrode,
otherwise it will impact its accuracy.
4.7. There should be not bubble (tiny bubbles are OK) in the electrolyte inside the
electrode, if yes, it will influence its response speed and test accuracy. If there are big
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bubbles, please remove the cap and refill electrolyte.
4.8. The membrane surface should be humid to avoid the electrolyte around cathode
becoming dry, which will influence electrode performance greatly.
4.9. Make sure the temperature probe in the electrode shell under water, or inaccurate
temperature will result in big errors to the test value.
4.10. When the instrument is abnormal, please restore it to default settings(in P8 and
make it on) and make measurement after calibrations.
5. Parameter settings
5.1. Table of parameter setup
5.2.1. Resolution setting(P1)
5.2.1. Long press to enter set mode
Then press to enter P1.
5.2.2. Press or to select resolution 0.1 or 0.01. Press to
confirm the change and back.
5.2.3. Press to enter next parameter setting or press to back to
measuring mode.
Indicator
Description
Remarks
P1
Resolution setting
0.1mg/L, 0.01mg/L
P2
Manual temperature compensation
(0-99.9)℃
P3
Salinity compensation setup
(0 - 45)ppt
P4
Air pressure compensation setup
(0.0-199.9)kPa
P5
Temperature unit setup
℃℉
P6
Backlight time closing setting
0-20min or 0 stands for this
function is not working
P7
Automatic shutdown time setting
0-20min or 0 stands for this
function is not working
P8
System restore setup
OFF or ON
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5.3. Manual temperature compensation(P2).
5.3.1. Press to choose P2 in mode P1,
Then press to enter P2.
5.3.2. Press or to change the temperature. Long press these keys to
change the figures continuously. Press to confirm the change and back.
5.3.3. Press to enter next parameter setting or press to back to
measuring mode.
5.4. Salinity compensation(P3)
5.4.1. Press to choose P3 in mode P2,
Then press to enter P3.
5.4.2. Press or to change salinity. Long press these keys to change the
figures continuously. Press to confirm the change and back.
5.4.3. Press to enter next parameter setting or press to back to
measuring mode.
5.5. Air pressure setting(P4)
5.5.1. Press to choose P4 in mode P3,
Then press to enter P4.
5.5.2. Press or to change the pressure value according to the standard
air pressure. Long press these keys to change the figures continuously. Press
to confirm the change and back.
5.5.3. Press to enter next parameter setting or press to back to
measuring mode.
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5.6. Temperature unit setting(P5)
5.6.1. Press to choose P5 in mode P4,
Then press to enter P5.
5.6.2. Press or to select temperature unit ℃/℉. Press to
confirm the change and back.
5.6.3. Press to enter next parameter setting or press to back to
measuring mode.
5.7. Auto shutdown timer of backlight(P6)
5.7.1. Press to choose P6 in mode P5,
Then press to enter P6.
5.7.2. Press or to choose auto shutdown time of backlight. Press
to confirm the change and back.
5.7.3. Press to enter next parameter setting or press to back to
measuring mode.
5.8. Auto shutdown timer of the device(P7)
5.8.1. Press to choose P7 in mode P6,
Then press to enter P7.
5.8.2. Press or to set the automatic shutdown time of the device.
Press to confirm the change and back. “0” means disabling this function.
5.8.3. Press to enter next parameter setting or press to back to
measuring mode.
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5.9. Restore default settings(P8)
5.9.1. Press to choose P8 in mode P7,
Then press to enter P8.
5.9.2. Press or to choose “ ” and confirm by pressing and “888”
blinks on the screen, which means it is restored to default settings. Press to back
to measuring mode.
5.9.3. Be careful to use this function, because all saved data will be removed once
restored to default settings.
6. Change diaphragm cap
The diaphragm cap should be changed as bellow steps if following situations happen:
long response time, obvious errors to test value, something wrong with sensitive
membrane of DO electrode like wrinkles, cracks and damages.
6.1. Rotate off the cap
6.2. Wash the electrode without cap with pure water and wave it dry.
6.3. Wipe the cathode(gold film) surface dry carefully with a piece of flannel or facial
tissue.
6.4. Take a new cap and add electrolyte slowly and carefully to make sure there are no
bubbles. If bubbles appear, the remove them.
6.5. Put the cap on the horizontal table, and put electrode inside the cap vertically and
rotate it clockwise carefully until it is tight.
6.6. Make sure there are no bubbles in the electrolyte. Otherwise to reassemble it.
6.7. Don’t touch sensitive membrane when using it or changing the cap. Because the
sweat or fat on the hand will influence its performance.
7. Zero oxygen calibration
Zero oxygen calibration is only required when changing new electrode, diaphragm cap
or long time no use. After the zero oxygen calibration, do the full oxygen calibration.
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Usually zero oxygen calibration is not necessary. Please do as the following steps if
needed.
7.1. Make 250ml anaerobic water. Add 500mg sodium sulfite (Na2SO3) and 250ml pure
water into a flask with 250ml volume. Mix them completely(tiny divalent cobalt salt
could be added as catalyst). It is effective in 24 hours.
7.2. Connect DO electrode to instrument and be polarized for 15 minutes.
7.3. Dip DO electrode into anaerobic water, press to enter calibration mode, the
screen will show “CAL” at top right corner and wait 3-5 minutes until symbol “ ”
appears and press and shows 0%. Wash the electrode clean with pure water and
put it in the air vertically for 3-5 minutes until tested value stable and display symbol
“ ”, then press and shows 100%, meanwhile “CAL” disappears, calibration is
over and enter measuring mode. Then the screen will show “ ” which means
respectively 0% oxygen and 100% oxygen calibration is finished.
7.4. If instrument shows ≤0.02mg/L in five minutes, which means its response speed
and residual current are very good, zero oxygen calibration is not necessary to be done.
7.5. If instrument shows ≥0.15mg/L five minutes later, that means its response speed
is slow and residual current is high. You can change the diaphragm cap or remove the
cap and wipe carefully the cathode gold film surface with polishing paper, then clean
its surface with a piece of lint or facial tissue, wash it with pure water and wave it dry,
add some electrolyte into the cap and put it back to electrode tightly. And repeat the
zero/full oxygen calibration.
8. Salinity setting
The instrument has manual salinity compensation function. Before setting salinity
compensation, please measure its salinity value of the solutions to be tested with a
salinity meter and enter the measured result into the instrument, please refer to P3.
9. Air pressure setting
The instrument has manual pressure compensation function. In order to guarantee
pressure compensation accuracy, it is suggested to be set according to different place’s
pressure or altitude listed in appendix II&III. Please refer to P4 for details.
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VI. Packing List
Description
Number
P-512 DO meter
1 unit
DO electrode
1 piece
Diaphragm cap
2 pieces
Polarographic DO refill
1 bottle
AA Battery
2 piece
User manual
1 copy
Appendix I Saturated content of oxygen in water with different temperature
Temperature
(℃)
DO
(mg/L)
Temperature
(℃)
DO
(mg/L)
Temperature
(℃)
DO
(mg/L)
0
14.64
16
9.86
32
7.30
1
14.22
17
9.66
33
7.18
2
13.82
18
9.46
34
7.07
3
13.44
19
9.27
35
6.95
4
13.09
20
9.08
36
6.84
5
12.74
21
8.90
37
6.73
6
12.42
22
8.73
38
6.63
7
12.11
23
8.57
39
6.53
8
11.81
24
8.41
40
6.43
9
11.53
25
8.25
41
6.34
10
11.26
26
8.11
42
6.25
11
11.01
27
7.96
43
6.17
12
10.77
28
7.82
44
6.09
13
10.53
29
7.69
45
6.01
14
10.30
30
7.56
15
10.08
31
7.43
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Appendix II Saturated content of oxygen in water with different air pressure
Air Pressure
Dissolved Oxygen(mg/L)
mmHg
kPa
15℃
15℃
15℃
750
100.00
9.94
8.14
6.85
751
100.13
9.96
8.15
6.86
752
100.26
9.97
8.16
6.87
753
100.40
9.98
8.17
6.88
754
100.53
9.99
8.18
6.89
755
100.66
10.00
8.20
6.90
756
100.80
10.01
8.21
6.91
757
100.93
10.03
8.22
6.92
758
101.06
10.04
8.23
6.93
759
101.20
10.07
8.24
6.94
760
101.33
10.08
8.25
6.95
761
101.46
10.09
8.26
6.96
762
101.60
10.11
8.27
6.97
763
101.73
10.12
8.28
6.98
764
101.86
10.14
8.30
6.99
765
102.00
10.15
8.31
7.00
766
102.13
10.16
8.32
7.01
767
102.26
10.18
8.33
7.02
768
102.40
10.19
8.34
7.02
769
102.53
10.21
8.35
7.03
770
102.66
10.22
8.36
7.04
771
102.80
10.23
8.37
7.05
772
102.93
10.25
8.39
7.06
773
103.06
10.26
8.40
7.07
774
103.19
10.28
8.41
7.08
775
103.33
10.29
8.42
7.09
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Appendix III Saturated content of oxygen in water with different altitude
Altitude
Air Pressure
DO
Altitude
Air Pressure
DO
feet
meter
kPa
mmH
g
mg/l
feet
meter
kPa
mmHg
mg/l
0
0
101.3
760
8.25
7500
2287
77.1
579
6.28
500
152
99.34
746
8.09
8000
2439
75.63
568
6.16
1000
305
97.6
733
7.95
8500
2591
74.44
559
6.06
1500
457
95.87
720
7.81
9000
2744
72.97
548
5.94
2000
610
94.28
708
7.68
9500
2896
71.64
538
5.83
2500
762
92.54
695
7.54
10000
3049
70.17
527
5.71
3000
915
90.95
683
7.41
10500
3201
68.84
517
5.61
3500
1067
89.35
671
7.28
11000
3354
67.38
506
5.49
4000
1220
87.75
659
7.15
12000
3659
66.58
500
5.42
4500
1372
86.15
647
7.02
13000
3963
65.78
494
5.36
5000
1524
84.56
635
6.89
14000
4268
64.98
488
5.29
5500
1677
83.09
624
6.77
15000
4573
64.18
482
5.23
6000
1829
81.63
613
6.65
16000
4878
63.38
476
5.16
6500
1982
80.03
601
6.52
17000
5183
62.58
470
5.10
7000
2134
78.56
590
6.40
18000
5488
61.79
464
5.03
Remarks:
Conversion between mmHg and kPa: mmHg×0.13333=kPa
DOpt=P×DOt÷760
DOpt : DO concentration at temperature t and air pressure P(mg/L)
P: Air pressure(mmHg)
DOt : DO concentration at temperature t and air pressure 760mmHg(mg/L)
760: Air pressure(mmHg)
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