DKK-TOA WQC-30 User manual

●Please read this manual thoroughly before use to use it correctly.
●This manual should be provided to the person who actually operate this product.
Handheld Multi-Paramete
r
Water Quality Mete
r
MODEL WQC-30
No. WQC-LB16300E

Model WQC-30 Introduction
- 1 -
Introduction
(a) Thank you for purchasing this product from our company. This “Model WQC-30 Handheld
Multi-Parameter Water Quality Meter” (referred to below as “the instrument” or “the product”) has a
waterproof construction suitable for performing on-site measurements, and is equipped with clock
functionality and data memory functionality essential for data management.
(b) By connecting the model WMS-30 standard accessory sensor module to the instrument unit,
multi-parameter water quality measurements can be made (if the order was for the instrument unit
only, the sensor module will not be included).
(c) Optional equipment includes the AC adapter, external printer, RS-232C connector cable and
submersible stirrer. The external printer prints measurement values and calibration values.
(d) The “Safety Information” section contains important information so please read it with particular
care. Furthermore, this instruction manual will be necessary should uncertainties arise during use so
please look after it carefully.

Model WQC-30 Safety Information
- 2 -
Safety Information
(1) Meaning of symbols
The meanings of signal terms and symbol types related to warnings in this instruction manual are as
follows: Symbol alert marks on labels on the product etc. ( : Pictorial symbols for general warnings),
not only alert to the possibility of injury or damage, but should also be read as “Please refer to the
instruction manual.”
: Indicates the degree of possible harm for cases where incorrec
t
handling of the product may result in death or serious injury.
The term serious injury refers to loss of sight, burns (high temperature,
low temperature), electric shock, broken bones, poisoning etc.,
ongoing after-effects, hospitalization for medical treatment or the
requirement for long term outpatient status.
: Indicates the degree of possible harm or damage for cases where
incorrect handling of the product may result in injury or material
damage.
The term injury refers to injuries, burns, electric shock where
hospitalization for medical treatment or long term outpatient status is
not necessary. The term material damage refers to widespread damage
relating to house, household goods, livestock, pets, equipment o
r
equipment parts (damage occurring other than that to the produc
t
itself).
【IMPORTANT】: Indicates important matters relating to other issues. Such matters
include prevention of damage to the body of the product, preventio
n
of wasted time, the maintenance of performance, compliance wit
h
laws and regulations etc.
〔Notes〕: Indicates explanations, reasons, contexts, special exceptions etc. whic
h
improve understanding.
＞＞ : Indicates reference headings.
①, ②, ③: Indicates item numbers related to operation etc.

Model WQC-30 Safety Information
- 3 -
(2) Matters relating to safety compliance
Explosion・
outbreak of fire・
leakage of
liquids
●Do not use in places where explosive gases, flammable gases etc.
are present.
●Do not place the product in a fire or attempt to burn it. There is a ris
k
that the product will explode.
●Prior to removing the plug, AC adapter cover and the input-outpu
t
cover, be certain to check that the power switch is off. If water o
r
chemicals enter the internal parts of the product there is a risk of fire.
●When out of use for long periods of time, be sure to remove the A
A
alkaline dry cell batteries or AA type rechargeable nickel metal
hydride batteries from the product.
There is the possibility of leakage of battery liquid.
Falling ●When working at measurement sites, avoid risk of falling by using a
safety belt. Also, to avoid injury, wear a helmet, life-jacket, safet
y
shoes etc.
Hazardous
substances
●The hydrochloric acid used for electrode cleaning is a hazardous
substance. Wear protective equipment when handling it. Be sure to
check the safety data sheet (SDS).
Contamination
by foreign
objects
●Do not drop the instrument in the measurement tank etc. This can
result in damage.
Waterproofing ●Waterproof structure (IP67) for the instrument unit will only be fulfilled
with the plug, battery cover, AC adapter cover, and input-output cove
r
correctly installed.
●Do not touch the instrument unit with wet hands or clean it with wate
r
when the sensor module is removed, or when the battery cover, AC
adapter cover or input-output cover is open. Also, do not leave it in
places where there is a risk of ingress by chemicals or water.
Protection ●If used in a way not specified in this manual, the performance of the
equipment protection will be impaired.
Altitude ●Use only at altitudes (above sea-level) of 2000m or below.
Electrostatic
discharge
●The dissolved oxygen measurement circuit of the sensor module
uses parts that may be damaged by static electricity resulting in
failure. Static electricity may be discharged from your body b
y
touching the earth (ground) points on walls when indoors, or b
y
touching the ground when outdoors using bare hands. Prior to

Model WQC-30 Safety Information
- 4 -
inserting the dissolved oxygen electrode into the sensor module,
always discharge the static electricity from your body. After insertion
into the sensor module, and during maintenance inspections, always
discharge the static electricity from your body prior to handling so tha
t
the membrane set is not subjected to electrostatic discharge.
●Electrostatic-sensitive parts are also used for electrodes other than
the dissolved oxygen electrode. We strongly recommend discharging
static electricity from your body prior to handling the terminals o
f
responsive parts and sensor parts for all electrodes during
maintenance inspections.
●In case of malfunction due to electrostatic discharge, remove all the
power sources (battery, AC adapter) from the instrument, leave it fo
r
around 1 minute, turn on the power again and check the operation
again to confirm if there is a fault.
Isolation ●If the sample to be measured is grounded (measurements in the sea,
ponds, rivers, or built-in metal tanks), a commercially available
RS-232C isolator (signal isolation unit) is required between the
instrument unit and the connected RS-232C equipment (personal
computer, sequencer, etc.). If the RS-232C isolator is not used, the
measurement value may be affected by ground loops (signal currents
circulating through the earth).
Injuries ●To prevent damage, handle the instrument with care. In cases o
f
accidental damage, there is a possibility of injury with debris.
●Handle the sensor module and underwater stirrer (optional item)
carefully as they are heavy items. They may fall and cause injuries.
Disconnection ●Do not install in a manner which obstructs disconnection of the AC
adapter from the outlet. This can result in damage.
Dismantling and
modification
●Do not dismantle or modify parts in a manner not set out in the
instruction manual. This can result in damage.
Warning Labels
Loss
●When the warning labels affixed to the instrument become impossible
to read, please order replacements from the dealer or our office and
affix them in the original positions.

Model WQC-30 Safety Information
- 5 -
(3) Working with the instruction manual
This instruction manual includes important information such as “Matters relating to safety compliance”.
Please handle it as follows.
(a) The instruction manual is intended not only for initial operation, but also for subsequent operation,
maintenance, failure etc. Please keep it near the product so that the people who actually use the
product are always able to see it.
(b) Should the instruction manual be lost or become stained to the point it becomes unusable, please
order another instruction manual from the dealer etc.
(c) Some figures in the instruction manual or on the product labels etc. may be changed in form to assist
in understanding through abbreviations or abstractions of parts of the screen. Note that the numbers
in the screen examples are an example of this.
(d) With the passage of time, we may change the content of the instruction manual without prior notice
for the purpose of quality improvement etc., even whilst the product itself remains unchanged.
(e) The intellectual property rights for this instruction manual remain with us. Please do not reprint all or
part of it without our permission.

Model WQC-30 Product warranty
- 6 -
Product warranty
(1) Applicable to this warranty
DKK-TOA CORPORATION (hereinafter referred to as “the Company”) guarantees that the product will
operate satisfactorily as in the Company’s prescribed specifications (hereinafter referred to as “the
Specifications”). Failures that occur during the warranty period will be repaired free of charge.
(a) The warranty period of this product is 2 years from the date of delivery. (However, for the case of the
sensor module, it is 1 year from the date of delivery (electrodes etc. are excluded))
(b) Should there be an individually contracted guarantee, then the individual contract will be given
priority.
(c) Where failure or damage not covered by warranty is attributable to the Company, we do not limit the
legal rights regardless of the warranty period.
(2) Exclusions from this warranty
This warranty does not apply to the cases listed below. Repairs will be made for a fee.
(a) Direct or indirect failure or damage etc. caused where the purposes of usage or the usage itself exceed
the ranges specified in the Specifications for the product and its instruction manual.
(b) Direct or indirect failure or damage etc. caused by natural disasters such as earthquakes, wind, flood
and lightning strikes, or by other calamities such as accidents, fires, abnormal voltages, salt damage,
gas hazards, etc.
(c) Failure, damage etc. due to incorrect repair/remodeling attributable to customers.
(d) Failure, damage etc. due to transportation, movement, falls etc. attributable to the customer after
purchase.
(e) Electrodes, sensors, cells and consumables.
(f) Failure and damage caused by the use of consumables, parts, software, etc. other than those of the
Company.
(g) Failure or damage caused by connected equipment other than that of the Company.
(h) Customer data stored in the product, configuration information, programs or software lost due to
customer responsibility.
(i) Based on contract specifications etc. with customers, and with regard to the guarantee of products of
other companies specified by customers, which have been used in combination with the products of
the Company (including products embedded to products of the Company), the Company guarantees
only the products of the Company, and the products of other companies are guaranteed by those
companies (*1).
(j) Failure or damage caused by non-fulfillment of maintenance items beyond the maintenance period
specified in the Company’s instruction manual.
(k) Use outside Japan (individual contract is required for use outside Japan).
(l) Product not having a product nameplate (unless there is evidence of delivery by the Company).
(3) Other terms
(a) This warranty is valid only in Japan.
(b) The normal supply period of maintenance parts (*2) to customers with the product is 5 years (*3)
after discontinuation of manufacturing and sales.
(c) An engineer from the Company will judge the cause of failure, damage, etc.
(d) For repairs, please contact our sales representative.
*1: We ask that customers take responsibility for managing the warranties of products made by other
companies.
*2: Maintenance parts are supplementary items necessary to maintain product operation.
*3: When procurement is impossible and there is no alternative item, this may be less than 5 years.
P30 <1>

Model WQC-30 Reading this manual
- 7 -
Reading this manual
To gain an overview of this product and get it started etc., please refer to the necessary items in this
instruction manual. The circled numbers in the diagram indicate the chief items which need to be referred
to in order.

Model WQC-30 Table of contents
- 8 -
Table of contents
●Introduction··················································································1
●Safety Information ······································································2
(1) Meaning of symbols … 2
(2) Matters relating to safety compliance … 2
(3) Working with the instruction manual … 4
●Product warranty ········································································5
●Reading this manual ··································································6
1. Package contents ································································· 13
2. Specifications and functions················································14
(1) Specifications… 14
(2) Functions … 17
3. Name and function of each part ·········································18
(1) Instrument unit and control panel … 18
(2) Display sections … 19
(3) Sensor module (Model WMS-30) … 22
(4) pH electrode … 23
(5) Turbidity sensor, electrical conductivity cell and temperature sensor … 24
(6) Dissolved oxygen electrode (optional)… 24
4. Preparation············································································· 26
4.1 Battery installation··································································26
4.2 Affixing and removing the protective cover (optional) ·····················29
(1) Affixing the protective cover … 29
(2) Removing the protective cover … 29
4.3 Connecting the sensor module ················································· 31
4.4 Installation of the dissolved oxygen electrode (optional) ·················33
5. Basic operation······································································37
5.1 Key points of use ··································································· 37

Model WQC-30 Table of contents
- 9 -
5.2 Measurement procedure ························································· 39
5.3 Power on/off ·········································································48
(1) Power on … 48
(2) Power off … 49
5.4 Date and time adjustment ························································50
5.5 Switching measurement types ··················································52
5.6 Hold and release measurement values·······································54
5.7 Manual memory operation with measurement values ···················· 56
5.8 Checking, printing and erasing memory data ······························· 58
6. Calibration ··············································································60
6.1 Calibration of pH ····································································60
(1) Key points of pH Calibration … 60
(2) pH Calibration Procedure … 61
(3) pH Calibration Data Check … 65
(4) Deletion of pH Calibration Data … 68
(5) Change of pH Standard Solution … 69
6.2 Calibration of turbidity ·····························································72
(1) Key points of Turbidity Calibration … 72
(2) One-Touch Zero Calibration of Turbidity … 73
(3) Span Calibration of Turbidity … 76
(4) Preparation of Formazine Standard Solution … 80
(5) Preparation of Kaolin Standard Solution … 81
(6) Turbidity Calibration Data Check … 81
(7) Deletion Turbidity Calibration Data … 83
6.3 Calibration of Electrical Conductivity··········································· 85
(1) Key points of Electrical Conductivity Calibration … 85
(2) Electrical Conductivity Cell Check … 85
(3) Cell constant Calibration … 89
(4) Preparation of cell constant calibration solution … 94
(5) Electrical Conductivity Calibration Data Check … 95
6.4 Temperature Calibration·························································· 97
6.5 Calibration of Dissolved Oxygen (optional) ································ 100
(1) Key points of Dissolved Oxygen Calibration … 100
(2) Dissolved Oxygen Span Calibration with Air … 103

Model WQC-30 Table of contents
- 10 -
(3) Dissolved Oxygen Span Calibration in Water Vapor
Saturated Air … 105
(4) Dissolved Oxygen Span Calibration in Saturated Water … 108
(5) Zero Calibration of Dissolved Oxygen … 111
(6) Two-Point Calibration of Dissolved Oxygen … 116
(7) Confirmation of Dissolved Oxygen Calibration Data … 118
(8) Deletion of Dissolved Oxygen Calibration Data … 119
7. Various functions ················································ 122
7.1 Operation screen maps ························································· 122
(1) pH operation screen map … 122
(2) Turbidity operation screen map … 123
(3) Electrical conductivity operation screen map … 124
(4) Salinity operation screen map … 125
(5) Dissolved oxygen operation screen map … 126
7.2 Data memory functions ························································· 127
(1) Changing the data number … 127
(2) Changing memory overwrite on/off … 130
7.3 Changing the interval memory ················································ 131
(1) Key points concerning interval memory … 131
(2) Changing the interval method and time ... 132
(3) Execution and termination of interval memory … 135
(4) Releasing the interval memory … 138
7.4 Set buzzer on/off·································································· 140
7.5 Set auto power off ································································ 141
7.6 Special turbidity functions····················································· 143
(1) Changing turbidity units … 143
(2) Switching the display range … 144
7.7 Special electrical conductivity functions ··································· 146
(1) Switching range … 146
(2) Changing the temperature compensation/temperature coefficient … 148
(3) Changing between old and new units … 150
7.8 Special salinity functions ······················································ 151
(1) Setting salinity units … 151
7.9 Special dissolved oxygen functions (optional) ··························· 152

Model WQC-30 Table of contents
- 11 -
(1) Setting dissolved oxygen measurement on/off … 152
(2) Changing the dissolved oxygen mode … 153
(3) Changing dissolved oxygen salinity correction … 154
(4) Changing dissolved oxygen atmospheric pressure correction … 154
(5) Changing dissolved oxygen display resolution … 157
(6) Setting dissolved oxygen saturation formula … 159
8. Optional equipment····························································· 161
8.1 Connecting the optional equipment·········································· 161
(1) Connecting AC adapter … 161
(2) Connecting external printer cable … 162
(3) Connecting RS-232C connecting cable … 162
8.2 Printing with external printer. ·················································· 164
(1) Printing pH calibration values … 164
(2) Printing turbidity calibration values … 165
(3) Printing the electrical conductivity cell constant calibration values … 166
(4) Printing dissolved oxygen calibration values … 166
(5) Printing measurement values … 167
8.3 Communication via RS-232C ················································· 171
(1) RS-232C communication format … 171
(2) Data recording software … 176
8.4 Submersible stirrer ······························································· 177
(1) Part names of submersible stirrer … 177
(2) Installing or replacing batteries … 178
(3) Steps for using the submersible stirrer … 181
9. Maintenance and inspections ··········································· 184
9.1 Taking care of instrument unit················································· 184
9.2 Taking care of pH electrode ··················································· 185
(1) Daily care … 185
(2) Taking care of dirty electrodes … 186
9.3 Taking care of turbidity sensors, electric conductivity cells and
temperature sensors····························································· 188
(1) Daily care … 188
(2) How to clean heavily soiled cell … 189
9.4 Taking care of the dissolved oxygen electrode (optional)·············· 190

Model WQC-30 Table of contents
- 12 -
(1) Daily care … 190
(2) Care in the case of long term storage … 190
(3) Taking care of dirty cathode surfaces … 191
9.5 Replacement of each part of pH electrodes ······························· 192
(1) Replacing the internal solution for reference electrode … 192
(2) Replacement of the liquid junction section … 193
(3) Replacement of the glass electrode chip … 194
(4) Replacement of the reference electrode … 195
9.6 Replacement of the dissolved oxygen electrode (optional) ··············· 198
(1) Replacement of dissolved oxygen electrode electrolyte and
diaphragm set … 199
(2) Replacement of the dissolved oxygen electrode … 201
9.7 Replacement of the batteries·················································· 202
10. Troubleshooting··································································· 203
10.1 Safety measures in error······················································· 203
10.2 Error messages ·································································· 204
10.3 Measures to be taken in the case of other problems ··················· 210
10.4 System reset ······································································ 214
(1) Resetting all data and parameters to default … 214
(2) Resetting all data except clock data and memory data to default … 214
11. Transportation, storage, disposal····································· 215
11.1 Transportation ····································································· 215
11.2 Storage·············································································· 216
11.3 Disposal············································································· 217
12. Parts/option list ···································································· 218
(Final page … 221)

Model WQC-30 1. Package Contents
- 13 -
1. Package Contents
The following table lists the package contents for the standard products. Optional items such as the
dissolved oxygen electrode and the submersible stirrer are not included.
Package contents list
Classification Part name Model name
Code number Quantity Appearance
Unit Handheld Multi-Parameter Water
Quality Meter
WQC-30 1
Accessories Sensor module
(Standard 2m cable) *1
WMS-30 1
pH standard solution
pH 6.86 500mL
pH 4.01 500mL
143F192
143F191
1 each
Reference electrode replaceable
liqui
d
j
unction part
678458K 1
Reference electrode internal
gel liquid (50mL)
143F235 1
Special tool (spanner) 67628000 1
Calibration beaker 7340450K 2
Silicon grease 141D002 1
AA batteries (sample batteries
included
)
*2
-
2
Dummy cap (built-in to electrode
mounting part)
7313440K 1
Instruction manual
-
1
〔Notes〕*1: Not included when ordering only the instrument unit
*2: The supplied batteries are sample items only, and battery life may be extremely short. Please
replace with commercially available AA alkaline dry cell batteries or AA rechargeable nickel
metal hydride batteries.

Model WQC-30 2. Specifications and Functions
- 14 -
2. Specifications and Functions
(1) Specifications
Heading Details
Product name Handheld Multi-Parameter Water Quality Meter
Model name WQC-30
Measurement method pH: glass electrode method
Temperature: thermistor resistor type
Turbidity: 90° scattered light method
Electrical conductivity: AC four electrode method
Salinity: converted from electrical conductivity
Dissolved oxygen: diaphragm type polarographic method (optional)
Available measurements pH, temperature, turbidity, electrical conductivity, salinity, dissolved oxygen
(optional)
Display Digital
Measurement value, temperature, time (month-day, hour-minutes)
simultaneous display
Temperature compensation range pH: ATC (automatic temperature compensation): 0.0 to 50.0°C
Electrical conductivity: ATC (automatic temperature compensation): 0.0 to 50.0°C
OFF (no temperature compensation)
Salinity: as for electrical conductivity
Dissolved oxygen: ATC (automatic temperature compensation): 0.0 to 50.0°C
Measurement range
pH Range pH 0.00 to pH 14.00
Resolution 0.01 pH
Temperature Range 0.0 to 50.0°C (However, the sample should not freeze.)
Resolution 0.1°C
Turbidity Range 0.0 to 80.0NTU (mg/L), 0 to 800NTU (mg/L) *1
Resolution 0.1NTU (mg/L) (0.0 to 80.0), 1NTU (mg/L) (0 to 800)
Electrical
conductivity
Range 0.0mS/m to 10.00S/m
Resolution Number of significant digits 3 1/2
Salinity Range 0.00 to 4.00% (NaCl)
0.00 to 40.00 (PSS: practical salinity)
Resolution 0.01% (NaCl), 0.01 (PSS)
Dissolved
oxygen *2
(optional)
Range 0.00 to 20.00mg/L, 0 to 200% (saturation)
Resolution 0.01/0.1mg/L (selectable), 1% (saturation)
Display range
pH Range pH -2.00 to pH 16.00
Resolution 0.01 pH
Temperature Range -5.0 to 110.0°C
Resolution 0.1°C
(Continues)

Model WQC-30 2. Specifications and Functions
(Continued)
Heading Details
Display range
Turbidity Range 0.0 to 88.0NTU (mg/L), 0 to 880NTU (mg/L)
Resolution 0.1NTU (mg/L) (0.0 to 80.0), 1NTU (mg/L) (0 to 800)
Electrical
conductivity
Range 0.0 to 202.0mS/m, 0.000 to 2.020S/m, 0.00 to 20.20S/m
Resolution Number of significant digits 3 1/2
Salinity Range 0.00 to 4.04% (NaCl)
0.00 to 40.40 (PSS)
Resolution 0.01% (NaCl), 0.01 (PSS)
Dissolved
oxygen
(optional)
Range 0.00 to 22.00mg/L, 0 to 220% (saturation)
Resolution 0.01/0.1mg/L (selectable), 1% (saturation)
Repeatability *3
pH ±0.05 pH
Temperature ±0.5°C
Turbidity ±1% (FS) (±0.8NTU (0.0 to 80.0NTU) , ±8NTU (0 to 800NTU))
Electrical conductivity ±1% (FS) (for each range)
Salinity ±0.04% (NaCl), ±0.42 (PSS)
Dissolved oxygen (optional)±0.1mg/L, ±2%
Calibration
pH 1 to 3 point(s) calibration for 4, 7, 9, (10)
Turbidity zero, span calibration
Dissolved oxygen (optional)zero, span calibration
Water depth (sensor) Up to 30m (equivalent to 0.3MPa)
Waterproof construction IP67 *4
Print function Interface standard equipment. The printer is an optional item.
RS-232C interface
(Communication conditions) *4, *5
Standard equipment (non-isolated) *6
•
In cases where the sample being measured is grounded (when measuring sea,
ponds, rivers, built-in metal tanks etc.), a commercially available RS-
232C
isolator (signal isolation unit) is required between the instrument unit
(WQC-30) and the connected RS-
232C equipment (personal computer,
sequencer, etc.). This is because the measu
red values may be affected by
ground loops (signal currents circulating through the earth).
DC power supply DC2.4 - 3V 0.3
VA AA alkaline dry cell batteries LR6 (2) or AA rechargeable
nickel metal hydride batteries HR6 (2)
DC5V 0.9VA AC adapter input connection
AC power supply AC100-240V 50/60Hz 7VA AC adapter (optional)
External dimensions Instrument unit: approx. 35 (height) × 68 (width) × 173 (depth) mm
Sensor module: approx. φ55 × 476 (length)
(Continues)
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Model WQC-30 2. Specifications and Functions
- 16 -
(Continued)
Heading Details
Weight Instrument unit: approx. 290g (including battery)
Sensor module: approx. 1400g (2m), approx. 2100 g (11m),
approx. 3500g (30m)
Performance guarantee temperature
range
0 to 45°C
However, this excludes cases where the temperature of the sensor module
changes abruptly. *7
*1：For calibration with formazine standard solution “NTU”, and for calibration with kaolin standard
solution, “mg/L” is displayed. SS concentration cannot be measured.
*2：Flow velocity condition is 10cm/s or over.
*3：For fixed conditions.
*4：Not valid when the sensor module is not connected and when using external input-output
(optional).
*5：May not be used at the same time as the print function
*6：In cases where the sample being measured is grounded (when measuring sea, ponds, rivers,
built-in metal tanks etc.), a commercially available RS-232C isolator (signal isolation unit) is
required between the instrument unit (WQC-30) and the connected RS-232C equipment (personal
computer, sequencer, etc.)
【IMPORTANT】•If an RS-232C Isolator is not used, the measured values may be affected
by ground loops (signal currents circulating through the earth).
*7：When using the optional AC adapter or external printer this is 0 to 40°C.
〔Note〕• This sensor module is not for use in continuous measurement. When performing simple
monitoring, please limit the maximum continuous usage time to 24 hours or less.
• In order to maintain the accuracy of measurements, regular cleaning of the sensor part is required.

Model WQC-30 2. Specifications and Functions
- 17 -
(2) Functions
Heading Details
Clock function Internal
Data memory Up to 200 data sets (measurement date/time, temperature value, measured
value) can be recorded.
Interval memory Measurement values are periodically recorded.
• Cancel interval memory (OFF)
• Short interval (short)… 00mins 02secs to 99mins 59secs cycle.
• Long interval (long)… 02mins to 99mins cycle.
• The minimum interval when the external printer is connected is 5 seconds.
Auto power off It is possible to preset ON/OFF operation.
ON times of: 10mins/20mins/30mins/60mins can be selected and the power
supply will switch off in the absence of any key operation.
Selection of pH standard
solution
It is possible to select (set) the standard solution to either JIS standard or US
standard.
Temperature calibration
function
1 point calibration
Dissolved oxygen salt
correction
It is possible to set this ON/OFF
Atmospheric pressure
correction
800 to 1200hPa (by key entry)
Print function When the printer is connected
1. Printing measurement values
• Manual printing
• Printing using the interval function
• Printing memory data
2. Printing calibration data (pH, turbidity, electrical conductivity,
dissolved oxygen)
RS-232C interface Data communication function

Model WQC-30 3. Name and Function of Each Part
- 18 -
3. Name and Function of Each Part
(1) Instrument unit and control panel
<Front> <Back>
Up key
Down key
Power switch
Sensor key
Menu key
Enter / hold key Clear key
Data in / left arrow key Data out / right arrow key
Connector for
sensor
connection
Display
section
Control panel
Battery
cover
AC adapter
cover
I/O cover
Name of each part of the instrument unit
Control panel key types and functions
Key type
(notation in the manual) Function
Power switch ( ) • Press for 2 seconds or more to switch the power (ON/OFF).
• Pressing for less than about 2 seconds returns directly to the
[Measurement Screen] from all other screens.
Sensor key ( ) • pH measurement screen: Press for about 2 seconds or more to perform
pH calibration.
• Turbidity measurement screen: Press for about 2 seconds or more to
perform one touch zero calibration.
• Electrical conductivity measurement screen: Pressing for less than about
2 seconds switches the measurement range.
Press for about 2 seconds or more to switch to auto range.
• Dissolved oxygen measurement screen: Press for about 2 seconds or
more to perform dissolved oxygen calibration.
(Continues)

Model WQC-30 3. Name and Function of Each Part
- 19 -
(Continued)
Key type
(notation in the manual) Function
Menu key ( ) • Switches to [Menu Screen].
Up key, down key
(,
)
• The measurement type display switches.
• Numerical change (increase/decrease) and function selection switches.
Enter/hold key
()
• Enters numerical value and executes hold function.
• Proceeds to the next screen.
Clear key ( ) • Deletes calibration values etc.
• Returns to the previous screen.
Data in/left arrow key
()
• Save the measured value.
• Select each symbol on[Menu Screen].
Data out/right arrow key
()
• Display a saved value.
• Select each symbol on[Menu Screen].
(2) Display sections
1 Data number display 2 Battery symbol 3 Memo symbol
4 Operation indication
5 Salinity conversion
symbol
6 Main display
7 Auto Range Symbol 8 Standard liquid
bottle symbol
9 Measurement range
10 Sensor symbol
11 Hold symbol
12 Temperature display
13 Date and time display
14 Error symbol
15 Zero calibration symbol
16 Span calibration symbol
17 Temperature
compensation
symbol
18 Mode Symbol 19 etc. symbol
20 ATC/MTC symbol
21 CSymbol
22 Data number symbol
23 SALSymbol
24 INT. symbol 25 ATMSymbol
26 Clock symbol
Display section