YEO-KAL 615 User manual

Yeo-Kal Electronics Pty Ltd 18/26 Wattle Road, Brookvale NSW Australia
Telephone [phone] Fax [phone]
USER MANUAL
Model
615 Water Quality Analyser
For firmware V1.23
Version
3.2
Date
26/4/2013
Information in this document is the copyright of YEO-KAL Electronics Pty Ltd and is subject to change
without notice. No part of this document may be copied or reproduced by any means without the
express written permission of YEO-KAL Electronics Pty Ltd. All trademarks are the property of their
respective companies.
© 2012 Yeo-Kal Electronics Pty Ltd

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Contents
INTRODUCTION......................................................................................... 5
GENERAL DESCRIPTION.................................................................................... 5
SPECIFICATIONS.............................................................................................. 5
Reader Unit:........................................................................................... 5
Sensors: ................................................................................................. 6
Temperature.......................................................................................... 6
Conductivity........................................................................................... 6
Salinity ................................................................................................... 6
Dissolved Oxygen................................................................................... 6
Turbidity ................................................................................................ 6
pH........................................................................................................... 7
ORP ........................................................................................................ 7
Depth (optional) ................................................................................... 7
Two auxiliary inputs............................................................................... 7
Physical .................................................................................................. 7
DESCRIPTION OF READER UNIT ......................................................................... 8
Connector Pins....................................................................................... 8
DESCRIPTION OF PROBE................................................................................. 10
Temperature Sensor............................................................................ 11
Dissolved Oxygen Sensor..................................................................... 12
Conductivity Sensor............................................................................. 12
Turbidity Sensor................................................................................... 12
PH/ORP Sensor .................................................................................... 12
ASSEMBLY................................................................................................13
CONNECTING THE PROBE ASSEMBLY................................................................ 13
CONNECTING AN EXTERNAL POWER SUPPLY ..................................................... 13
OPERATION..............................................................................................14
OPERATING INSTRUCTIONS............................................................................. 14
KEY PAD DESCRIPTION .................................................................................. 14
The menu options are as follows: ....................................................... 15
ADJUST CONTRAST (1) .................................................................................. 16
ALTITUDE AND SALINITY CORRECTIONS (2) ....................................................... 16
USING THE READER UNIT MEMORY................................................................. 16
Store Data Out (3) ............................................................................... 16
Erase Store data (4) ............................................................................. 17
LOGGED DATA OUT (6)................................................................................. 17
START LOGGER (5) ....................................................................................... 23

3
PROGRAMMING THE READER UNIT.................................................................. 23
CHECK BATTERY (7)...................................................................................... 24
DATA PORT OFF/ON (8) .............................................................................. 24
SENSOR SERIAL NUMBER (9) ......................................................................... 25
SET UP MENU...........................................................................................26
SET CLOCK (1) ............................................................................................. 26
611 SETUP (2) ............................................................................................ 26
ASSIGN/DEL SENSORS (3).............................................................................. 26
CONFIGURE DISPLAY (4)................................................................................ 26
SET PRECISION (5)........................................................................................ 27
DATE FORMAT (6)........................................................................................ 27
INSTRUMENT TIMEOUT (7) ............................................................................ 27
SET FILE IN (8) ............................................................................................. 27
SET FILE OUT (9).......................................................................................... 28
BEEPER (10)................................................................................................ 28
TURBIDITY AVERAGE (11).............................................................................. 28
ID SENSOR INPUTS (12) ................................................................................ 28
LIGHT KEY ................................................................................................... 28
CALIBRATION ...........................................................................................29
TEMPERATURE CALIBRATION .......................................................................... 31
HIGH CONDUCTIVITY/SALINITY CALIBRATION .................................................... 31
LOW CONDUCTIVITY CALIBRATION................................................................... 32
DISSOLVED OXYGEN CALIBRATION ................................................................... 32
PHCALIBRATION .......................................................................................... 33
ORP CALIBRATION ....................................................................................... 34
TURBIDITY CALIBRATION................................................................................ 34
DEPTH CALIBRATION ..................................................................................... 35
INTERNAL BLUETOOTH AND GPS ..............................................................36
BLUETOOTH................................................................................................. 36
One off Pairing:.................................................................................... 36
GPS 36
ESTABLISHING BLUETOOTH AND GPS POWER ................................................... 37
Enable power:
Enable GPS functionality:
Display GPS data to screen and memory allocation
MAINTENANCE.........................................................................................38
READER UNIT MAINTENANCE ......................................................................... 38
RESET......................................................................................................... 38
BATTERY REPLACEMENT ................................................................................ 39
................................................... 37
................................................... 37

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D.O. SENSOR MAINTENANCE ......................................................................... 39
Changing the Membrane.....................................................................40
Dissolved Oxygen Stirrer Maintenance............................................... 40
PH/ORP SENSOR MAINTENANCE ................................................................... 41
TURBIDITY SENSOR MAINTENANCE.................................................................. 42
CONDUCTIVITY SENSOR MAINTENANCE............................................................ 43
STORAGE .................................................................................................45
APPENDIX 1 - CONVERSIONS USED .........................................................46
APPENDIX 2 - COMPLIANCE ....................................................................47
APPENDIX 3 - PART NUMBERS ................................................................48

5
Introduction
The YK615 comes already assembled. The only construction required is to connect the probe assembly to the
Reader Unit and, if necessary, connect the external power supply.
General Description
The YK615 Water Quality Analyser is a robust multi-parameter field instrument which can be used for real time
water quality measurements or for remote operation using a built in data logger.
The instrument consists of a multi-sensor probe and a Reader Unit which can both store and display data and
also has extra auxiliary analog probe inputs. The probe and Reader Unit have been designed to be compact, light
weight and easy to use. Data is transferred to the Reader Unit using serial communications giving reliable,
interference free measurements. The Reader Unit controls the operation of the instrument, provides easy
access to the data, control, memory and calibration functions. The Reader Unit contains a real time clock and all
stored data includes the date and time of measurement. Both stored data and calibration information can be
easily down loaded to a computer using the YEO-KAL data transfer programs.
The YK615 comes with storage container to protect the sensors while the instrument is in storage.
An optional auxiliary battery lead is available for connecting the YK615 to an external power supply during
extended periods of remote logging.
Specifications
Reader Unit:
Display:LCD with four lines of 16 alphanumeric characters.
Memory: Remote logging - 2425samples. Real time (STORE key) 840samples. All samples include date,
time plus optional GPS if assigned. Memory is backed up by lithium battery to guard against main battery
failure.
Headers: 75 for STORE key data; 25 for logged data. Note: each header is 18 characters long.
Sample Rate: 1 per 2 minutes to 1 per day in Standard Logging Mode. 1 per second in Fast Logging Mode.
Display updates every 2 seconds.
Communications: Baud rate 9600, 8 data bits, 0 parity, 2 stop bits.
Power: Battery pack containing 8 "C" size cells. Memory backup voltage supplied by ½ AA lithium cell.
Case: Impact resistance polycarbonate; waterproof display, keypad, connectors and case.
Dimensions: 130 mm x 95 mm x 190 mm
Weight:1.6 kg

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Sensors:
Temperature
Range: -2 - 50ºC
Accuracy: ±0.05ºC
Resolution: 0.01ºC
Type: pt 100 platinum element
Conductivity
High Range: 0 - 80 ms/cm
Accuracy: ±0.05 ms/cm
Resolution: 0.02 ms/cm
Low Range: 0-8000 us/cm
Accuracy: ±5 us/cm
Resolution: 3 us/cm
Type: Four electrode cell
Salinity
Range: 0 - 60 ppt
Accuracy: ±0.05 ppt
Resolution: 0.02 ppt
Type: See Appendix 1 -Conversions Used
Dissolved Oxygen
Range: 0 - 200% saturation
0 - 20 mg/l
Accuracy: ±0.5%
Resolution: 0.1%
Type: Active silver and lead electrode sensor with PTFE* membrane and built-in stirrer
Turbidity
Range: 0 - 600 ntu
Accuracy: ±0.5 ntu (0 - 300 ntu range)
±5 ntu (300 - 600 ntu range)
Resolution: 0.3 ntu
Type: Nephelometric measurement from a 90°sensor with pulsed infra-red light source

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pH
Range: 0 - 14
Accuracy: ±0.03
Resolution: 0.01
Type: Combination silver/silver chloride type with sintered Teflon* junction
ORP
Range: -700 mV to +1100 mV
Accuracy: ±3 mV
Resolution: 1 mV
Type: Combination bare metal electrode common reference junction with pH electrode (see
Appendix 1 -Conversions Used)
Depth (optional)
Range: 0 - 100 m or
0 - 150 m
Accuracy: ±0.5% of full scale
Resolution: 0.1 m
Type: Dual active silicone strain gauge
Two auxiliary inputs
Input: 0-5 volts each input
Physical
Cable length: 3 m or 10 m. Other lengths made to order.
Dimensions: 50 mm diameter, 320 mm long

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Description of Reader Unit
The Reader Unit is housed in a tough, durable, high impact polycarbonate case with a keypad and alpha-numeric
display mounted on the front panel. The side of the case has five connectors. The top connector is used for data
output, the second for connecting an external power supply and the third is the sensor connector. The two
remaining connectors are used for auxiliary analog probe inputs and a GPS input. Each connector is provided
with a protective cap which screws over the connector ensuring full waterproof sealing. The connectors also
have a polarising pin so that incorrect connection cannot be made. Inside the Reader Unit a CPU controls the
operation of the instrument, memory stores data and 8 C size rechargeable batteries power the instrument.
Connector Pins
The connector pins on the Reader Unit connectors are numbered in clockwise order from the polarising pin (see
figure 1). The following table lists the purpose of each pin on the connectors.
Communications Auxiliary Power 611 Sensor
Pin 1 Ground Negative Ground
Pin 2 RS232 out Positive Data
Pin 3 RS232 in n/a +12V
GPS Auxiliary Sensor 2
Pin 1 Ground Ground
Pin 2 Signal 0-5V Signal 0-5V
Pin 3 +12V +12V

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Figure 1: Reader unit for the YK615 : a) Top view
showing key pad and alphanumeric display b) End
view showing connectors.

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Description of Probe
The probe assembly consists of sensor, cable and connectors. The body of the probe is made of PVC with a PVC
sensor guard. The interface cable is permanently connected to the probe body to eliminate the need for
underwater connectors. In the event of the cable being cut, the probe has a waterproof seal between the cable
connection and the internal electronics package. At the other end of the cable is a corrosion and water resistant
connector for connection to the Reader Unit.
The sensors can easily be accessed by sliding the sensor guard up and rotating the bottom section of the probe.
(see fig 2b)
The conductivity and dissolved oxygen sensors can be removed for servicing. However, the whole unit must be
thoroughly dry before these sensors are removed. A cotton bud can be used to dry the spaces in between the
sensors.
Figure 2: a) Complete probe assembly b) Sensor cluster exposed
by lifting sensor cage and rotating probe base C) Expanded view
of sensor cluster with dissolved oxygen sensor detached.

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Temperature Sensor
The temperature sensor consists of a pt 100 platinum element, housed in a stainless steel sheath for robustness
and corrosion resistance. The temperature sensor requires little maintenance, however the temperature
measurement is used for calculating the dissolved oxygen in mg/l and for temperature correction of the
conductivity sensor, so it is important that the temperature sensor is properly calibrated.
Figure 3: End view of probe
(without bottom section)
showing position of sensors.

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Dissolved Oxygen Sensor
Dissolved Oxygen is measured using an active type membrane covered sensor. The sensor itself consists of silver
and lead electrodes and a 25um PTFE membrane and is filled with a 1.0M potassium hydroxide. A constant flow
of water passes the sensor, maintained by a stirrer located on the bottom section of the probe.
When the silver and lead electrodes are connected through the external circuit, electrons pass from the lead
electrode to the silver electrode. When oxygen is present at the surface of the silver electrode, it reacts with
electrons to produce hydroxyl ions.
At the lead electrode the loss of electrons produces lead ions. The lead's electrons combine with hydroxyl to
precipitate lead hydroxide on the lead electrode.
The rate of transference of electrons via the external circuit from the lead to silver electrode ie that is the
current flowing in the external circuit, is the measure of the rate of cell reaction and thus the rate at which
oxygen reaches the silver electrode. The current flowing in the external circuit is directly related to the oxygen
concentration in the sample being measured by the electrodes.
The Dissolved Oxygen sensor may periodically require a new membrane and electrolyte. A unique knurled nut is
used to hold the sensor membrane in position without overstressing the membrane. This gives long term
stability and allows easy replacement. The sensor can be removed from the probe for servicing. A replacement
probe is ready for use immediately after installation and calibration.
Conductivity Sensor
The conductivity is measured using a 4 electrode bridge. The four electrode system uses automatic
compensation to overcome any build up of contamination on the electrodes. The electrodes are made from fine
platinum and are coated with platinum black to enhance the long term stability and sensitivity of the sensor.
The coating should last for a long period of time if it is not mechanically removed, however, the coating can be
replaced using the optional platiniser or by returning the sensor to YEO-KAL Electronics Pty Ltd.
Turbidity Sensor
The turbidity sensor is located in the hole which runs through the bottom section of the probe and is lined with
a glass tube. Turbidity is measured by the nephelometric method which uses a light source and a detector
measuring the light scattered at 90 degrees to the incident light beam. A pulsed infra-red light source is used.
PH/ORP Sensor
The pH and oxidation reduction potential (ORP) are measured using
separate pH sensor and bare metal platinum electrode for ORP.
They both share an internal reference electrode in the pH sensor.
This sensors has a refillable secondary junction for sensor
maintenance. This sensor with maintenance helps combat
accumulation of internal contamination.

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Assembly
The YK615 comes already assembled. The only construction required is to connect the
probe assembly to the Reader Unit and, if necessary, connecting the external power
supply.
Connecting the Probe Assembly
To attach the probe assembly, first unscrew the knurled connector cap from the
SENSOR connector of the Reader Unit. The connector cap is attached to the Reader Unit
by a chain so that it can be replaced whenever the probe assembly is disconnected. To
connect the probe assembly, align the locating pin on the Reader Unit with the slot on
the cable connector and push the cable connector into the Reader Unit sensor
connector then screw home the retaining ring.
Connecting an External Power Supply
Extended remote logging, and charging the internal Reader Unit batteries can be
achieved by connecting the unit to an external power dc power supply such as
240V/18VDC switched power supply, a car battery or solar panel. To connect the
external power, first attach the external power supply lead to the Reader Unit. To do
this, unscrew the knurled connector cap from the AUX BATT connector of the Reader
Unit. Align the locating pin on the Reader Unit with the slot on the cable connector and
push the cable connector into the Reader Unit connector then screw home the retaining
ring. The connector cap is attached to the Reader Unit by a chain so that it can be
replaced whenever the external power is disconnected. Connect the red terminal clamp
to the positive terminal of your power supply and the black clamp to the negative
terminal.

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Operation
The YK615 comes already assembled. The only construction required is to connect the
probe assembly to the Reader Unit and, if necessary, connecting the external power
supply.
If the pH sensor has a cap over it, the cap should be removed (SLIDE THE CAP OFF, DO
NOT UNSCREW) prior to operation. See section 6 for IMPORTANT INFORMATION.
Operating Instructions
The following is provided as a quick reference for operation of the instrument. To gain
maximum performance and reliability from the YK615, make sure that you read and
understand the entire user manual before operating the instrument.
The instrument is switched on or off by pressing the centre of the ON/OFF key.
When the unit is switched on, the display will briefly show the serial number of the
instrument and the version number of the software loaded in the Reader Unit. If the
probe is connected, the display will then automatically begin to show the value of
readings from the probe. The parameters displayed will be four parameters at one time.
Press the arrow keys to scroll the display through the other parameters.
From here, the main menu is entered by pressing the MENU key. If the sensor is not
connected, the LCD display will show no sensors have been used. Press main menu to
scroll through the menu options, press the arrow keys to select a menu items as
indicated by the arrows on the LCD display. Press the ENTER key to select Main Menu or
Set Up Menu. You can back out of any point in the menu without changing the current
settings by pressing the ESC key.
Key Pad Description
Time: Hold down key to observe the date and time on the LCD
Menu: Select Main menu OR Setup menu
Cal: Calibrate any of the sensors, See Chapter 0.
Light: Press light key to illuminate LCD display
Store: Store data in real time and by holding down the key, a data tag can be entered.
ESC: To exit a particular routine.
Enter: To accept a particular routine
ON
OFF

15
Arrows: Up, Down, Back or Forward used in the main menu and tagging data.
The menu options are as follows:
Main Menu
1. ADJUST CONTRAST Alter display contrast
2. ALT CORRECT Enter altitude for correcting
D.O. readings
3. STORE DAT OUT Down load store data to
computer
4. ERASE STORE MEMORY Erase data entered using the
STORE key
5. START LOGGER Enter a logging program
6. LOGGED DAT OUT Down load logged data to
computer
7. CHECK BATTERY Display Battery Voltage
8. SW DATA PORT Displayed data is output through
COMMS Port
9. SENS S/N If available, serial number of
probe is displayed.
Set up Menu
1. SET CLOCK Adjust date & time
2. 611 SET UP 611 probe installed
3. ASGN\DEL SENS Select assign or delete sensor
4. CONFIG DISP Assign sensors on LCD display
5. SET PRECISION Sensor resolution on display
6. DATE FORMAT Change date to country format
7. INST TIME OUT Battery save function
8. SET FILE IN Restores all settings
9. SET FILE OUT Saves all settings
10. BEEPER Audible keyboard indicator
11. TURB AVERAGE Integrate turbidity readings
12. ID SENS INPUTS Sensor Channel Identification
(Auxiliary Only)
Notice that main menu option 5 (START LOGGER) requires that all data be cleared from
memory. You will be asked for conformation before memory is cleared.

16
The Reader Unit can be turned off without losing any of the instrument settings. If the
logger is activated, the unit will continue to record measurements even if the Reader
Unit is turned off.
Adjust Contrast (1)
When the instrument is used in the field, variations in ambient light and temperature
may make the display difficult to read. This can be remedied by adjusting the display
contrast.
To make this adjustment, go to main menu. Use the arrow keys to until the message 1)
ADJ CONTRAST appears then press ENTER. Now press the up or down arrow keys until
the display is easier to read then press ENTER or ESC to return to the main menu.
Altitude and Salinity Corrections (2)
The solubility of oxygen in water is less in brackish or sea water than in fresh water and
also decreases with increasing altitude. For dissolved oxygen concentration
measurements to be accurate, they must be compensated for the salinity of the water
being tested and for the atmospheric pressure. The YK615 will calculate the correct
value of dissolved oxygen concentration and percent saturation once you have entered
the altitude for the particular sample being tested, salinity corrections are made
automatically.
1. With the instrument deployed, select 1) ALT CORRECTION from the main menu
and press ENTER.
2. Press the number keys until the display shows the correct altitude in meters.
Press ENTER. The altitude which you have entered will remain until it is
changed, even if you turn the instrument off.
Using the Reader Unit Memory
Store Data Out (3)
The Reader Unit has two separate memories: the store memory and the logger memory.
The logger memory can hold up to 2135 readings and the store memory can hold up to
600 readings. Once stored, the data can then be down loaded into a computer via the
YEO-KAL software or printed at a later date.
The store memory is used to hold spot measurements. To store a reading while in the
field simply press the STORE key. The data will be down loaded in the order in which it is
stored so keep a record of the site at which each measurement was made so that the
data can be easily analyzed. The operator will be asked to connect the serial data cable
to the PC. Press ENTER and the operator will asked to either down load :
All data, by date, by tag, after making selection press ENTER to proceed or ESC to go
back.
ALL data press ENTER the operator will be asked they require calibration constants
included with the data. This function is useful for quality assurance procedures.

17
By date, All data that falls between two dates and times will be down loaded with or
without the calibration header.
By tag, all data after a tag will down loaded with or without calibration constants
included. If another tag is required the operator will be asked to edit the existing data
tag so that the existing tag cannot used again.
Erase Store data (4)
From the main menu press the ENTER after selecting Erase Store Mem, the operator will
be asked press ENTER or ESC. Press ENTER to proceed and clear memory.
Logged Data Out (6)
Data stored in the YK615 can be down loaded to a computer and then stored, graphed
or printed out using most popular applications. The data can also be sent directly to a
printer. When the data is down loaded, it includes a header, as shown in figure 4 below,
indicating whether the data is from the logger or store memory.
All the parameters recorded are averaged over 10. This enhances the quality of the data
by smoothing out any unwanted transients.

18
$H
YEO-KAL MODEL 615
SERIAL NUMBER: 317
DATE OF DOWNLOAD: 18/11/05 16:33
DATE FORMAT: DD/MoMo/YY HH:MM:SS
Port Param Date Time lo dat lo sp lo temp hi dat hi sp hi temp offset slope
-----------------------------------------------------------------------------------------------$D
Ser4 Depth (M) 11/11/05 09:57 469 0.00 0.00 547 100.00 0.00 -469.000 0.780
Ser0 E.C (uscm) 16/09/04 07:38 17 0 0.00 465 1413 17.60 -17.000 0.369
Ser1 Sal (ppt) 14/09/04 11:42 0 0.00 0.00 1689 35.00 16.81 0.000 37763.898
Ser2 Temp (C) 14/09/04 11:37 -708 10.00 0.00 2495 30.00 0.00 1950.444 113.986
Ser3 Turb (ntu) 14/09/04 11:57 199 0.0 0.00 1328 100.0 0.00 -199.000 5.645
Ser5 pH (pH) 14/09/04 11:47 1689 4.00 16.81 -1777 10.00 16.78 4000.111 -593.322
Ser6 ORP (mv) 14/09/04 11:50 239 252 0.00 665 472 0.00 249.351 1.936
Ser7 D.O.(%sat) 14/09/04 12:00 -4 0.0 0.00 577 100.0 11.75 -4.000 4.219
Aux0 Aux chan 0 Not calibrated.
Aux1 Aux chan 1 Not calibrated.
Aux2 Aux chan 2 Not calibrated.
Aux3 Aux chan 3 Not calibrated.
Aux4 Aux chan 4 Not calibrated.
$H-----------------------------------------------------------------------------------------------
Data tag # 1:=ABC

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Date Time Depth (M) Temp (C) E.C (uscm) E.C (mscm) Sal (ppt) Dens(g/cm3)S.G. (sg) TDS (g/l D.O.(%sat) D.O.(mg/l) pH (pH) ORP (mv) Turb (ntu)
------------------------------------------------------------------------------------------------------------------------------------------------------------------
18/11/05 16:32:41 0.00 21.23 0 0.00 0.00 997.8 0.9979 0.0 39.9 3.54 6.81 292 144.0
18/11/05 16:32:45 0.00 21.25 0 0.00 0.00 997.8 0.9979 0.0 61.1 5.42 6.81 320 160.8
18/11/05 16:32:48 0.00 21.26 0 0.00 0.00 997.8 0.9979 0.0 66.3 5.89 6.81 322 164.2
18/11/05 16:32:50 0.00 21.27 0 0.00 0.00 997.8 0.9979 0.0 69.1 6.13 6.81 322 177.7
18/11/05 16:32:52 0.00 21.27 0 0.00 0.00 997.8 0.9979 0.0 69.8 6.19 6.81 321 177.7
------------------------------------------------------------------------------------------------------------------------------------------------------------------
Data tag # 2:=DEF
Date Time Depth (M) Temp (C) E.C (uscm) E.C (mscm) Sal (ppt) Dens(g/cm3)S.G. (sg) TDS (g/l D.O.(%sat) D.O.(mg/l) pH (pH) ORP (mv) Turb (ntu)
------------------------------------------------------------------------------------------------------------------------------------------------------------------
18/11/05 16:33:23 0.00 21.25 0 0.00 0.00 997.8 0.9979 0.0 39.9 3.54 6.81 289 143.9
18/11/05 16:33:25 0.00 21.26 0 0.00 0.00 997.8 0.9979 0.0 51.0 4.53 6.81 310 148.7
18/11/05 16:33:27 0.00 21.27 0 0.00 0.00 997.8 0.9979 0.0 59.2 5.25 6.81 317 152.3
18/11/05 16:33:28 0.00 21.27 0 0.00 0.00 997.8 0.9979 0.0 63.9 5.67 6.81 319 157.3
18/11/05 16:33:30 0.00 21.28 0 0.00 0.00 997.8 0.9979 0.0 67.0 5.95 6.81 320 160.7
------------------------------------------------------------------------------------------------------------------------------------------------------------------
Figure 4b: Sample of data output from the YK615 (date format: dd/mm/yy).

20
Data tag # 1:=ABC
No 1 2 3 4 5
Date 18/11/05 18/11/05 18/11/05 18/11/05 18/11/05
Time 16:32:41 16:32:45 16:32:48 16:32:50 16:32:52
Depth (M) 0.00 0.00 0.00 0.00 0.00
Temp (C) 21.23 21.25 21.26 21.27 21.27
E.C (uscm) 0 0 0 0 0
E.C (mscm) 0.00 0.00 0.00 0.00 0.00
Sal (ppt) 0.00 0.00 0.00 0.00 0.00
Dens(g/cm3) 997.8 997.8 997.8 997.8 997.8
S.G. (sg) 0.9979 0.9979 0.9979 0.9979 0.9979
TDS (g/l 0.0 0.0 0.0 0.0 0.0
D.O.(%sat) 39.9 61.1 66.3 69.1 69.8
D.O.(mg/l) 3.54 5.42 5.89 6.13 6.19
pH (pH) 6.81 6.81 6.81 6.81 6.81
ORP (mv) 292 320 322 322 321
Turb (ntu) 144.0 160.8 164.2 177.7 177.7
Data tag # 2:=DEF
No 1 2 3 4 5
Date 18/11/05 18/11/05 18/11/05 18/11/05 18/11/05
Time 16:33:23 16:33:25 16:33:27 16:33:28 16:33:30
Depth (M) 0.00 0.00 0.00 0.00 0.00