YEO-KAL 801C User manual

Yeo-Kal Electronics Pty Ltd 18/26 Wattle Road, Brookvale NSW Australia
Telephone [phone] Fax [phone]
USER MANUAL
Model
801C Optical DO and Temperature Sensor with
S618 Reader/Logger
Version
1.1
Date
28/7/2021
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.
© 2021Yeo-Kal Electronics Pty Ltd

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Contents
INTRODUCTION............................................................................................4
GENERAL DESCRIPTION.............................................................................4
SPECIFICATIONS.........................................................................................4
Reader Unit............................................................................................4
Sensors...................................................................................................5
Temperature...........................................................................................5
Optical DO........................................... Error! Bookmark not defined.
Physical..................................................................................................5
DESCRIPTION OF READER UNIT .................................................................6
Connector Pins.......................................................................................6
Communications....................................................................................7
DESCRIPTION OF PROBE.............................................................................8
Temperature Sensor............................................................................... 9
............................................................. Error! Bookmark not defined.
Optical DO Sensor.................................................................................9
ASSEMBLY....................................................................................................10
CONNECTING THE PROBE ASSEMBLY ......................................................10
OPERATION .................................................................................................11
OPERATING INSTRUCTIONS......................................................................11
KEY PAD DESCRIPTION............................................................................12
UPLOAD DATA FROM S618 TO PC...........................................................13
Clear Store Memory (1) ......................................................................13
Calibration Constants to PC (2)...........................................................13
Store Data out (3) ................................................................................13
Logged Data Out (4)............................................................................13
MAIN MENU LOGGER SETTINGS.............................................................. 15
Start/Stop Logger time (5)...................................................................15
Programming the Reader Unit.............................................................15
Check Battery (6) ................................................................................ 15
SET UP MENU S618 SETTINGS................................................................. 16
Sensor Serial Number (1)....................................................................16
Set Clock (2)........................................................................................16
Configuring the sensors - Assgn/Config Sens (3)...............................16
Live Real Time (4) .............................................................................. 16
Average (5)..........................................................................................16
Data Out Format (6) ............................................................................16
Set Precision (7) ..................................................................................16
Auto Off (8).........................................................................................16
Altitude Correct (9) .............................................................................16
Auto Warning (10) ..............................................................................16

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CALIBRATION.............................................................................................17
TEMPERATURE CALIBRATION..................................................................17
OPTICAL DO CALIBRATION.....................................................................22
INTERNAL BLUETOOTH AND GPS............................................................ 23
BLUETOOTH .............................................................................................23
One off Pairing:...................................................................................23
GPS23
BLUETOOTH AND GPS POWER................................................................. 23
MAINTENANCE...........................................................................................24
READER UNIT MAINTENANCE .................................................................24
BATTERY REPLACEMENT......................................................................... 24
PROBE MAINTENANCE.............................................................................24

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Introduction
The YK801B comes already assembled. The only construction required is to connect the probe assembly to the
reader unit.
General Description
The model 801B Water Quality Analyser Reading Unit is a robust Optical DO 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 Optical DO and temperature sensor probes and a reader unit which can store, log
and display data. The probe and reader unit have been designed to be compact, durable and easy to use. Data is
transferred to the reader unit using Bluetooth. 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 data transfer program, YK Quick Terminal.
The battery charger is supplied with this reader unit.
Specifications
Reader Unit
Display:
TFT LCD with colour selectable display. Both sensors of real time data can be displayed
within one screen and on a computer at the same time.
Memory:
Remote logging –Maximum 65536 samples. Real time (STORE key) maximum 8192
samples. All samples include date, time, GPS and data tag if assigned. Memory’s data
can be kept for 10 years without battery.
Data tags:
You may type your own tag name or automatically generate one by this reader unit
according to the time and date, your older tag name or GPS data. Note: Each data tag
is limited to 18 characters long.
Sample Rate:
Logging time can be easily set from 3 seconds to 1 sample every 24 hours. Display
updates every 1 second.
ADC:
22 bit ADC for probe.
Communications:
Baud rate 9600, 8 data bits, 0 parity, 1 stop bits.
Power:
Battery containing 4.8AH rechargeable lithium battery.
Case:
Impact resistance polycarbonate; waterproof display, keypad, connectors and case.
Dimensions:
100 mm X 35 mm X 200 mm
Weight:
0.4 kg

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Sensors
Temperature
Range: -2 - 50ºC
Accuracy: ±0.05ºC
Resolution: 0.01ºC
Type: Pt. 1000 platinum element
Optical DO
Range: 0 - 200% saturation
0 - 20 mg/l
Accuracy: ±0.5%
Resolution: 0.1%
Physical
Cable length: 3 m or 10 m. Other lengths made to order up to 100 meters.
Dimensions: 26 mm diameter, 270 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 a colour TFT
LCD display mounted on the front panel. On the bottom of the case is a probe/charging connector. The
connector also has a polarising pin so that an incorrect connection cannot be made. Inside the reader unit a CPU
controls the operation of the instrument, the memory store data and the battery power of the instrument.
Figure 1 Water quality analyser reader unit/logger

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Connector Pins
The connector pins on the bottom of the reader unit connectors are numbered in clockwise order from the
polarising pin (see figure 2). The following table lists the purpose of each pin on the connector.
Communications
Pin 1 Ground Negative
Pin 2 +12VDC Positive
Pin 3 RS232 in N/A
Pin 4 RS232 out N/A
Figure 2 Connector pin sockets

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Description of Probe
The probe assembly consists of a sensor, cable and connectors. The body of the probe is made of stainless steel
with a PVC head. 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.
Figure 3 Optical DO and temperature probe

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Temperature Sensor
The temperature sensor consists of a Pt. 1000 platinum element, housed in a stainless steel sheath for
robustness and corrosion resistance. The temperature sensor requires little maintenance. See Figure 4.
Figure 4 Temperature sensor
Optical DO Sensor
Optical DO will emit an infrared light when excited by a blue light which is detected by a filtered
detector. See Figure 5.
Figure 5 Optical DO emitter and detector

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Assembly
The YK801B comes already assembled. The only construction required is to connect the probe
assembly to the reader unit.
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 reciprocal connector then screw home the retaining ring. See Figure 6.
Figure 6 Probe connected to reader unit

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Operation
Operating Instructions
The following is provided as a quick reference for operation of the instrument. To gain maximum
performance and reliability from the YK801B, make sure that you read and understand the entire
user manual before operating the instrument. The reader unit has easy to follow instructions for
each function.
The instrument is switched on or off by pressing the button of the ON/OFF key for about 3 seconds.
See Figure 5.
Figure 6 On/off menu keypad
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 all parameters at one time.
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.

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Key Pad Description
Time: It is automatically displayed on the top right of the main menu. See Figure 7.
MENU: Select MAIN MENU.
STORE: Store data in real time and by holding down the key, a data tag can be entered.
ESC: To exit a particular routine.
ENT: To accept a particular routine
Arrows: Up, Down, Left or Right Forward used in the main menu and tagging data.
The menu options are as follows:
Main Menu
1. Calibration Calibrate sensors
2. Logger Settings Clear Memory, logging settings and arm
3. Real Time Real time data display
4. Upload to PC Upload data and constant to PC by Bluetooth
5. U620 ->&<- PC PC directly connected to U620 Probe by Bluetooth
6. R801B Settings Set clock, R801B reading unit display format, real time display on
PC etc.
7. Special Info Bluetooth pairing, software version, unit status
Figure 7 Main display
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.

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Upload Data from S618 to PC
Clear Store Memory (1)
From the main menu select logger settings press the ENTER and then selecting Clear 801B (or 620)
Memory. Press ENT and the operator will proceed and clear memory.
Calibration Constants to PC (2)
The calibration constants can be uploaded to a PC for quality assurance reports. The information
shows Date, Time and calibration coefficients.
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 16384 readings and the store memory can hold up to 4096 readings. Once
stored, the data can then be down loaded into a computer via Bluetooth or data cable.
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 analysed.
Logged Data Out (4)
Data stored in the YK801B can be uploaded to a computer by Bluetooth or dada cable and then
stored, graphed or printed out using most popular applications. When the data is uploaded, it
includes a header, as shown in figure 8 below, indicating whether the data is from the logger or the
store memory.
Figure 8 Data header as:
Total samples while Logging with Unit 618 51
ID, Time , Temp (C), D.O. (%sat),Latitude, Longitude
ID: 668, Start Time: 18:38:25 18/07/21
1 18/07/21 18:38:25 15.34 100.6 000 00.0000,000 00.0000
2 18/07/21 19:08:25 15.21 100.7
3 18/07/21 19:38:25 15.08 100.7
4 18/07/21 20:08:25 14.95 100.8
5 18/07/21 20:38:25 14.83 100.8

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In order to upload the data stored in memory to a computer, you will need terminal software i.e. YK
Terminal or similar. To transfer data, perform the following operations:
1. From Main MENU select Upload to PC and press ENTER.
2. For Bluetooth Upload go (8) select By Bluetooth or Data Cable
3. Pair PC Bluetooth to R801B reader unit.
4. Calibrated constants or All Data or STO data (the data is sampled/stored in real time by
pressing STORE) will be selected and transferred to PC.
5. For cable download go to Upload to PC and press ENTER.
6. On the menu press By Cable (8) and connect the cable from reader unit to PC.

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Main Menu Logger Settings
Start/Stop Logger time (5)
The YK801B can also be programmed to take measurements at regular intervals and to store the
results in the logger memory.
The fastest sample rate in Standard Logging Mode is one per two minutes, the stirrer is activated
one minute before the sample is to be taken and will switch off immediately after the data has
been recorded.
Programming the Reader Unit
To program the logger for a measurement routine, perform the following steps:
1. Enter the main menu, select Logger Settings and press ENTER. Then follow ON Screen
instructions.
2. Set Logger TAG if want a tag name for the logging.
3. Set START/STOP time and sample rate and press STORE button to arm the logger.
The instrument is now programmed. The logger will automatically switch on the stirrer 1 minute
before the programmed start time.
To halt the logging process, select ESC key and follow the on screen instructions.
Check Battery (6)
Battery voltage will be always displayed on the MAIN MENU. The warning information will be
displayed if the battery needs charging. Note: After plugging in the charger switch ON then switch
OFF. The LCD will momentarily flash when charging. If the charger is plugged into the unit without
switching ON and OFF, it could be up to an hour before it starts charging.
Figure 9 Main Menu with voltage level
voltage level

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Set Up Menu S618 Settings
Sensor Serial Number (1)
The reader reads the serial number of the probe attached to the 801B. If more than one probe is
used it identifies the correct probe to be used with the reader unit.
Set Clock (2)
The clock uses 24 hour format DD/MM/YYYY HH:MM:SS
From main MENU select R801B Settings->Set Clock and then follow the on screen instructions to
set clock.
Configuring the sensors - Assgn/Config Sens (3)
From main MENU select R801B Settings->Assgn/Confg Sens and then follow the on screen
instructions to assign or delete sensors.
Select sensor to be displayed. Set Precision.
Set the order that the sensors are displayed can be arranged by selecting 1 or 2.
To save the settings, press STORE.
Live Real Time (4)
Real time data to PC.
Average (5)
From main MENU select R801B Settings->Set Average and then follow the on screen instructions
to set the average samples and then follow the on screen instructions to assign or delete sensors.
Data Out Format (6)
Set data out for data base format or standard format.
Set Precision (7)
Select Sensor and set Precision.
Auto Off (8)
Automatic shutdown time can be adjusted with arrows keys.
Altitude Correct (9)
Altitude correction for dissolved oxygen readings is not in use for other sensors.
Auto Warning (10)
If the battery is low, select ON or OFF to display warning on LCD.
From main MENU select R801B Settings->More Settings and then follow the on screen instructions
to set auto off time.

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Calibration
Calibration order is important to ensure the accuracy of the YK801B. The instrument needs to be
calibrated on a regular basis including after any maintenance has been performed on the probe.
The frequency at which calibration is required will depend on the specific application for which the
instrument is to be used. The optimum time between calibrations can be established by regularly
checking the performance of the instrument in standard solutions. If the YK801B is kept well
maintained and calibrated on a regular basis, a single zero point calibration is sufficient to keep the
instrument performing to specification. However, two point calibrations are required whenever a
sensor has had any maintenance.
The calibration procedures require that the probe be immersed in distilled water for zero
calibration. Make sure that you rinse both the probe and container before each calibration. The
standard solutions are available from YEO-KAL Electronics Pty Ltd or most major scientific suppliers.
Note: Zero calibration will overcome offset due to optical obscuration. This the most important
calibration point and should be done in a large black container.
To enter the calibration menu, select Calibration in main MENU and press ENTER. Select the proper
sensor and press ENTER again. Then follow the on screen instructions to complete the
calibration(s).
The previous calibrated data can be used again for the current calibration if the data is correct.
Temperature Calibration
The temperature calibration should vary very little over the lifetime of the instrument, however it is
worth checking on the accuracy of your temperature. Temperature calibration is performed at two
temperatures. The low temperature must be between 0oand 20oC and the high temperature must
be between 30oand 50oC. A thermometer to at least 0.1oC accuracy and resolution must be used.
To calibrate temperature, proceed as follows:
1. Select TEMPERATURE from the Calibration.
Lo Pt Raw or Hi Pt Raw will appear.

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2. Press the ARROW keys to Lo Pt Raw to make the selection then press ENTER to calibrate the
low temperature range 0-20oC.
Press ENTER to proceed.
Place the probe into a stirred water bath.
3. After pressing ENTER,raw data from the temperature sensor will appear.
Wait until the readings are stable and make a note of the reading on the calibration
thermometer and press ENTER.

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4. Use ENTER key and arrow keys to Set LoVal temperature.
5. If you proceed with the high range calibration, Select Hi Pt Raw by using the arrow keys and
press ENTER.

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6. Place the probe into a 25o- 50oC water bath.
7. Press ENTER, the raw data is displayed.
8. Immerse the probe in a stirred water bath held at a constant temperature between 25oand
50oC and wait for the probe to reach a constant temperature. Make a note of the
temperature on the calibration thermometer and press ENTER.