Cheonsei KEMPION MASTAR+ User manual

www.cheonsei.co.kr
Digital pH/ORP Controller
Instruction Manual
DIGITAL CONTROLLER

2
Thank you very much for purchasing Cheonsei pH/ORP Controller.
Before beginning operation, please read this instruction manual carefully.
Correct handling, repair, & maintenance are described easily.
Please keep this instruction manual at the place where you can see it easily.
※The specification of products can be changed for improvement without prior
notice.
1. Notice for Safety …………………………………………………………… 3
2. Product Conrmation ……………………………………………………… 4
3. General ……………………………………………………………………… 4
4. Model Code ………………………………………………………………… 5
5. Specications ………………………………………………………………… 5
6. Set Components …………………………………………………………… 6
7. Name & Function of Each Part …………………………………………… 7
8. Calibration …………………………………………………………………… 8
9. Settings & Operating ……………………………………………………… 11
10. System Diagram ………………………………………………………… 17
11. Handling of Components ……………………………………………… 17
12. Cause & Solution of Problem ………………………………………… 20
13. Warranty ………………………………………………………………… 21
14. Repair Service …………………………………………………………… 21
15. Controller Wiring ………………………………………………………… 23
16. Controller Dimension …………………………………………………… 22
CONTENTS

3
1 Notice for Safety
1-1 Introduction
•
To use the products safely, the signs are showed on the manual like below.
•
As it is a matter of safety, please be sure to keep the directions in manual.
•
he signs and indication are as follows.
Warning
Person death or serious injury will be occurred, if warning is not kept by wrong handling.
Caution
Person injury or property damage will be occurred, if caution is not kept by wrong handling.
1-2 Cautions for Operation Condition
Caution
•
Do not use this Controller and its components for other purposes.
Otherwise it may cause trouble.
•
Please keep the followings, otherwise it may cause trouble.
Ambient temperature : -5 ~ 45℃
Relative humidity : below 90%
Install location : Indoor and inside of electrical panel
Temperature of the handling liquid : below the working temperature described in the electrode
specication
•
Gas or moisture, which occur in jobsite, can lead to the internal corrosion of the controller and it
may cause reduction of service life and trouble.
1-3 Warning for Handling Condition
Warning
•
Install this controller beyond the reach of children and/or unauthorized person.
•
Turn off the power and stop the controller & other equipments when repairing or disassembling
the controller.
If power is on during work, it may cause electric shock.
•
Controller should be properly grounded and install ELCB(Earth Leakage Circuit Breaker) in order
to prevent electric shock.
•
In case of installation in the electric panel, install the controller after securing sufcient space in
order not to contact with the components inside electric panel.
•
Do not touch with wet hands. Electric shock may occur.
•
Use only designated parts. If undesignated parts are used to the controller, it may cause accident
& trouble.
•
Do not arbitrarily reconstruct the controller. If the controller is arbitrarily reconstructed, it may
cause accident & trouble.

4
3 General
Caution
•
Do not use the controller of which case was damaged. If the controller is used, it may cause
trouble to equipment connected with the controller.
•
Do not install controller in the heavy moist or dusty place. Electric shock and trouble may occur.
•
Do not use power other than that specied in controller. Otherwise, it may cause malfunction or
re.
•
Refrain from voltage withstand test in order to prevent damage of internal parts.
•
Dispose of waste controller in accordance with related national law.
2-1 Check Point When Unpacking
Please check following points immediately after receiving the product.
If the defect is found from the product, please request it to local agent or CHEONSEI.
 Is specication correct as ordered?
 Is there any missing parts ?
 Is there any visible damage caused by vibration or shock during transport?
 Is there any loosened bolt or nut?
2-2 Components
Controller
•Digital pH/ORP Controller : 1 SET
•Bracket(SPC-1 M4×52) : 2 EA
•Instruction Manual : 1 COPY
SET Components
•Refer to section 6.
2 Product Confirmation
This controller is a digital controller built-in micro processor. It can be used by composing circuit with
the external devices through dry contact of analog Input & output and, as option, it can be composed
according to wanted using condition by installing Communication card.
This controller is designed only for a high insulation shielded cable.
If you need to extend the electrode cable, refrain from using the general cable in market and use our
high insulation shielded cable.

5
4 Model Code
P –
 ① ② ③ ④
① Controller ② Controller Option ③ Output Option ④ Electrode
P : pH/ORP B : Standard
T : Temp.
Compensation
0 : Standard
1 : Temp.(4~20mA)
1 : GS-5
2 : GSH-5
3 : MS-5
4 : GST-5
5 : GSTH-5
6 : CPP11
7 : CPP12
5 Specifications
5-1 Controller
Specication Performance
Display &
Measuring
Range
pH 0.00 ~ 14.00pH
ORP -1999 ~ +1999mV
Temp -10.0℃ ~ 100℃
Resolution/
Accuracy
pH 0.01 pH / 0.01pH
ORP 1mV / 1mV
Temp 0.1℃ / 0.5℃
Ambient Temp. & humidity -10℃ ~ 40℃ / Relative Humidity : below 80%RH
(Must be free from condensation and dew)
Range of temp. compensation AUTO/MANUAL 0~100℃
Calibration Method 2 Points Calibration(Zero : pH7, Span : pH4 or pH9)
Display 3“ LCD Segment Display (LED Back Light : White)
Alarm Output
Setting HIGH, LOW
Output Dry Contact 1a 1b Contact capacity : 0.5A, 125VAC / 1A, 24VDC
Dead Band 0.00 ~ 1.00pH / 0~100mV
Analog output
pH 0.00 ~ 14.00pH 4~20mA Isolated output
(Load resistance 500Ω)
ORP -1999 ~ +1999mV
Temp -10℃ ~ 100℃ (Option)
Memory EEPROM
Communication RS-485 (Option)
Power AC85~245V, 50/60Hz (Power Consumption : 3W)
Case Anti-static ABS
Size 96mm * 96mm * 115mm
Weight Approx. 400g
Installation Place Indoor, inside electric panel

6
6 Set Components
5-2 Electrode
Code Model Use Internal
Liquid
Measuring
Range
Cable
effective
Length
Using
Temp.
Body
Material
1 GS-5 pH 3.3Mol KCl 0~14pH 4m 0~40℃ Glass
2 GSH-5 pH 3.3Mol KCl 0~14pH 4m 0~80℃ Glass
3 MS-5 ORP 3.3Mol KCl 0~±1999mV 4m 0~40℃ Glass
4 GST-5 pH Temp. Compensation 3.3Mol KCl 0~14pH 4m 0~40℃ Glass
5 GSTH-5 pH Temp. Compensation 3.3Mol KCl 0~14pH 4m 0~80℃ Glass
6 CPP11 pH Supplement-free 3.3Mol KCl 0~14pH 4m 0~80℃ PC
7 CPP12 pH Temp. Compensation &
Supplement-free
3.3Mol KCl 0~14pH 4m 0~80℃ PC
6-1 Standard Components
Set Model Components Specication Quantity
MESTAR+
PB0-1
Controller Digital pH/ORP Controller 1 Set
Panel Bracket SPC-1 M4 x 52mm 2 EA
Instruction Manual 24Page 1 Copy
Electrode GS-5 1 Set
Electrode Holder Standard : Ø34×1m, Material : PE 1 Set
Bracket for Holder Material : PVC 1 Set
Connection Box Coated with Anti-static lm 1 Set
Connection Cable High isolated special shield cable 20 m
KCl Solution 3.3Mol/123g 1 EA
KCl Bottle 500cc, Material : PE 1 EA
Buffer Powder pH4, pH7Each 2 EA
Standard Liquid Battle 500cc, Material : PE 2 EA
Beaker 500cc, Material : PE 1 EA
※Some components may vary depending on the SET model.
6-2 Optional Items
Connection Cable (up to 100m)

Quinhydrone Powder (for ORP)

Sampling Holder

7
7 Name & Function of Each Part
7-1 Front
Display : 3” LCD Segment
①Status
•SETUP : Display in setup mode
•MEAS : Display in measurement mode
•CAL : Display in calibration mode
•ZERO : Display in ZERO calibration
•SPAN : Display in SPAN calibration
②Main Display
: Measured value or setting screen is
displayed according to Mode.
③Alarm
•HOLD : Display in setting of measurement
value xed
•HIGH : Display in HIGH alarm
•LOW : Display in LOW alarm
④Sub Display : Display Temp. or display setting value when enter in setting mode or calibration mode.
⑤Unit : Display the unit which is set.
Key
: Enter Calibration Mode, if press the button for 5 seconds in Measuring Mode.
Exit the Calibration Mode, if press the button in Calibration Mode.
(Can not enter Calibration Mode when Setting Mode, displaying Error, & Setting to hold
the measured value)
: Enter the Setting Mode, if press the button in Measuring Mode.
Return to previous Mode, if press the button in Setting Mode.
: Menu is changed or Setting Value is increased, if press the button in Setting Mode or
Calibration Mode.
Setting value is fast increased, if press the button continuously.
High Alarm Setting Value is displayed for 3 seconds, if press the button for 3 seconds in
Measuring Mode.
: Menu is changed or Setting Value is decreased, if press the button in Setting Mode or
Calibration Mode.
Setting value is fast decreased, if press the button continuously.
Low Alarm Setting Value is displayed for 3 seconds, if press the button for 3 seconds in
Measuring Mode.
: Save the setting value in Setting Mode or Calibration Mode.
The buzzer will sound and all setting values will be initialized, if press the button for 5
seconds in Measuring Mode.
(Unable to initialize when Setting Mode, Calibration Mode, & displaying Error)
※When initialization, all calibration values and setting values will be changed to the initial
setting values before delivery from factory.



8
8-1 Calibration
This controller is Two-Point Calibration type and supports Automatic Calibration and Manual Calibration.
After Zero Calibration(pH7), perform Span Calibration(pH4 or pH9).
Perform calibration by using the standard solution of pH4, pH7, & pH9 and take a note that the controller
does not support calibration for other standard solutions.
Refer to the below table for the Standard Solutions which enables Automatic Calibration and temperature
characteristics according to the standard solutions.
pH4
Potassium Phthalate
pH7
Neutral Phosphate
pH9
Borate
0 4.01 6.98 9.46
5 4.01 6.95 9.39
10 4.00 6.92 9.33
15 4.00 6.90 9.27
20 4.00 6.88 9.22
25 4.01 6.86 9.18
30 4.01 6.85 9.14
35 4.02 6.84 9.10
40 4.03 6.84 9.07
45 4.04 6.83 9.04
50 4.06 6.83 9.01
55 4.08 6.84 8.99
60 4.10 6.84 8.96
70 4.12 6.85 8.93
80 4.16 6.86 8.89
90 4.20 6.88 8.85
95 4.23 6.89 8.83
8 Calibration
7-2 Rear
①Relay High : HIGH Alarm Output Terminal
②Relay Low : LOW Alarm Output Terminal
③Power : Power Supply Terminal
④Sensor : Electrode Connection Terminal
⑤Process : Analog output terminal of 4~20mA
for 0 ~ 14pH(ORP : -1999~1999mV)
⑥Temp : Analog output terminal of 4~20mA
for –10 ~ 100℃(Option)

9
8-2 Cautions for calibration
In calibration mode, do not be changed to Measuring Mode even after several minutes.
To exit the Calibration Mode, should stop calibration by pressing the CAL Key or complete
calibration by pressing the ENTER Key.
During calibration, if press CAL key to exit Calibration Mode or the Calibration Mode is exited in an
unusual manner, such as power off, Calibration Values are not stored.
Clean the electrode with clean or distilled water before submerging it or transferring it to a different
standard solution.
 For correct calibration, use it after stirring the standard solution sufciently.
Warning
•
Do not handle calibration powder or solution used for product calibration by children or the
elderly & the inrm, since it may be harmful to the human body.
Be sure to follow the doctor's prescription when drinking it.
•
When the glass electrode is broken, it may cause serious damage to the human body.
Be careful in handling the glass electrode and check the surface of electrode by naked eye and,
if there is a crack or an damage in the electrode, do not use it and discard it.
•
Be sure to wear protective gear, if the measuring liquid is harmful to the human body.
8-3 pH Calibration
<Auto Calibration> <Manual Calibration>

10
Clean the electrode with distilled water.
Immerse the electrode in the standard solution(Zero Calibration: pH7, Span Calibration: pH4 or pH9).
Wait until the Controller has stabilized.(It may take up to 5 minutes)
Make sure that the setting temperature matches the temperature of the standard solution.
If it is not matched, change the setting temperature.(Refer to 9-11 The setting of Automatic
Temperature Compensation)
※When using automatic temperature compensation, separate settings are not required.
In the Measuring Mode, press the CAL key for 5 seconds to enter the Calibration Mode.
Press ENTER key, after selecting the Calibration Method(Automatic: Aut, Manual: n
-
An) with ▲
and ▼key.
Press ENTER key, after selecting the Calibration Type(ZERO, SPAN) with ▲and ▼key.
The measured pH value is displayed.
In case of Manual Calibration, can change the Calibration Value with ▲and ▼key.
If you are using a standard solution not specified in 8-1 the temperature characteristic table,
change it to pH value that corresponds to that standard solution.
Press ENTER key to complete the calibration.
8-4 ORP Calibration
※In case of ORP calibration, it will be not necessary to set any calibration because ORP Calibration
of the controller was already completed before delivery from factory.
Zero Calibration
①Disconnect the electrode wire from the rear
terminal of the Controller.
②Short circuit between G(M) and R terminals.
Span Calibration
①Clear the electrode with distilled water and
submerge it in Quinhydrone solution.
②Wait until the Controller’s concentration has
stabilized.
③In the Measuring Mode, press the CAL key for
5 seconds to enter the Calibration Mode.
④Press ENTER key, after selecting the
Calibration Type(ZERO, SPAN) with ▲and ▼
key.
⑤The measured ORP value is displayed.
⑥Can change the Calibration Value with ▲and
▼key.
※Change the Calibration Value only if it is
needed.
⑦Press ENTER key to complete the calibration.
※In case of Zero Calibration, connect the
electrode wire.

11
9-1 Menu Setting
You can enter Menu mode by pressing the Menu key in Measuring mode, and can cancel the setting
or return to Measuring mode by pressing Menu key in Menu mode.
In Menu mode, if there is no any keystroke for 20 seconds, return to Measuring mode without any
storage of the value that is being set.
Enter key must be pressed to save the setting value.
9-2 Standard setting value
Menu Standard setting value(pH/ORP)
Mode(n
-odE) pH
Alarm(rEL) High 9.00pH 400mV
Low 4.00pH -400mV
Unit(unit) Meas pH mV
Temp ℃do not support
Dead Band(d.bnd) 0.00pH 0mV
Offset(oFS) 0.00pH 0mV
Damping(dAn
-P) 0.00pH 0mV
Hold on measured value(hold) OFF OFF
Auto temp. compensation(Atc) OFF do not support
Temp. offset(t.oFS) 0.0℃ do not support
9-3 Menu congurations
Menu congurations support 9 setup menus as shown below. Can change the menu by ▲& ▼key
after entering the Menu mode and can enter the setting display by ENTER key.
In case of each setting method, refer to the setting page(9-4 ~ 9-12) of the corresponding menu.
※ORP Mode do not support Setting of Unit(unit), Auto temp. compensation(Atc), & Temp. offset(t.oFS)
9 Setting & Function

12
9-4 Mode Setting
n
-odE is Mode setting menu.
The Mode you want to change is displayed,
while you enter the Setting display.
The Mode you want to select can be changed
by ▲,▼key. (pH or ORP)
Mode is changed to the selected mode by
pressing ENTER Key.
※If you change mode, all setting values will
be initialized.
9-5 Alarm Setting
<pH Mode> <ORP Mode>
rEL is Alarm setting menu.
Present Alarm setting value is displayed, while you enter the Setting display.
Alarm setting value can be changed by ▲,▼Keys
(Unit: 0.01pH / 1mV, Range: -0.00~14.00pH / -1999mV~1999mV)
Set the HIGH Alarm setting and then the LOW Alarm setting.
The HIGH Alarm value cannot be set lower than the LOW Alarm value, and the LOW Alarm value
cannot be set higher than the HIGH Alarm value.
 Dead band setting value is reected to Alarm setting value.
(Refer to 9-7 Dead band setting).
Ex.) When 0.30pH of Dead band & 2.00pH of HIGH Alarm are set, 1.70pH or higher cannot be set as LOW Alarm.
Generating condition of alarm
•HIGH Alarm : HIGH Alarm setting value – Measured value ≤ 0
•LOW Alarm : LOW Alarm setting value – Measured value ≥ 0
※In case of Dead band setting and its corresponding operation, refer to “9-7 Dead Band Setting”.

13
9-6 Unit Setting
unit is Unit setting menu.
Present set unit is displayed, while you enter the
Setting display.
Finish the setting by ENTER Key, after changing
setting unit by ▲,▼ Key.(Two type of unit(℃ &
℉) is supported)
※Unit setting is not supported in ORP Mode.
9-7 Dead band Setting
<pH Mode> <ORP Mode>
d.bnd is Dead band setting menu.
Present set value is displayed, while you enter the Setting display.
Dead band value can be changed by ▲,▼Key(Unit: 0.01pH / 1mV, Max.: 1.00pH / 100mV)
Finish the setting by pressing ENTER Key.
The alarm will occur as shown below example.
Ex.) When setting of 0.10pH
•When Setting value of HIGH Alarm is 3.00pH
: If measured value is 3.10pH or over, HIGH Alarm will occur, and, if measured value become less
than 2.90pH, HIGH Alarm will be off.
•When Setting value of LOW Alarm is 1.00pH
: If measured value is less than 0.90pH, LOW Alarm will occur, if measured value become 1.10pH
or over, LOW Alarm will be off.
※Dead band setting value can not be set within the difference range of HIGH Alarm and LOW
Alarm. (Refer to " 9-5 Alarm Setting")
Ex.) When 1.20pH of HIGH Alarm and 1.00 pH of LOW Alarm are set, 0.20pH or higher can not
be set as Dead band.

14
9-8 Offset Setting
<pH Mode> <ORP Mode>
oFS is Offset setting menu.
Present set value is displayed, while you enter the Setting display.
Offsetting value can be changed by ▲,▼Key.
(Unit: 0.01pH / 1mV, Range: -1.00~1.00pH / -100mV~100mV)
Finish the setting by pressing ENTER Key.
The measured value is displayed after offsetting it as much as setting value.
9-9 Damping Setting
<pH Mode> <ORP Mode>
dAn
-P is Damping setting menu.
Present setting value is displayed, while you enter the Setting display.
Damping value can be changed by ▲,▼Key.
(Unit: 0.01pH / 1mV, Max.: 1.00pH / 100mV)
Finish the setting by pressing ENTER Key.
The measured value is displayed after damping it as much as setting value.

15
9-10 Hold Setting
<pH Mode> <ORP Mode>
 hold is menu for xing the measured value.
You can select whether to hold the measured value or not, after entering the Setting display,
on or oFF can be changed by ▲,▼key.
When selecting oFF, setting is immediately completed.
When selecting on, the value to set is displayed.
The setting value can be changed by ▲,▼key.
(Unit : 0.01pH / 1mV, Range : 0.00~14.00pH / -1999~1999mV)
Finish the setting by pressing ENTER Key.
The measured value is displayed as the setting value and HOLD status is displayed.
※If the hold setting value is higher than the setting value of HIGH Alarm and lower than the
setting value of LOW Alarm, alarm will occur, but it will be not effected by Dead band.
※It is impossible to enter the calibration mode, when the measured value is hold state.

16
9-11 ATC Setting
Atc is Automatic Temp. Compensation setting menu.
You can select ATC, after entering the Setting
display.
on or oFF can be changed by ▲,▼key.
When selecting on, ATC setting is immediately
completed and ATC is displayed as Measuring
Mode.
When selecting oFF, set the temperature by manual.
The temperature setting value can be changed by ▲,
▼ key. (Unit: 0.1℃ / Range: 0.0 ~ 100.0℃)
Finish the setting by pressing ENTER Key.
The temperature setting value is displayed as the
present temperature.
※ Automatic Temp. Compensation setting is not
supplied in ORP Mode.
9-12 Temp. Offset setting
t.oFS is Temp. Offset setting menu.
Present setting value is displayed, while you enter
the Setting display.
Temp. Offset value can be changed by ▲,▼key.
(Unit: 0.1℃ / 0.1℉, Range: -5.0~5.0℃ / -9.0~9.0℉)
Finish the setting by pressing ENTER Key.
The present temperature is displayed after offsetting
it as much as setting value.
※ It is only operated when Automatic Compensation
is on.
※ If temperature sensor is not connected, it will be
not operated.
※ Unit setting is not supplied in ORP Mode

17
11 Handling of Components
10 System Diagram
※This manual describes only the handling for the standard set components.
11-1 Wiring of Connection Box(for Temp. Compensation)
Be careful not to change wiring, since the color of the electrode & the connection cable should be
matched with the terminals in the connection box each other.
10-1 Electrode Holder Type
10-2 Sampling Holder Type

18
General Standard Connection Box has only G(M) & R terminals, so connect G(M) & R terminal
on both sides of the acrylic plate to the same poles each other when wiring.
Caution
•
Do not install controller in the heavy moist, dusty, or vibration place. Bad connection at the
terminal may occur.
•
Do not install this connection box at the place where corrosive gas is generated.
•
Turn off power before repair & maintenance.
It may cause a damage of controller by static electricity.
11-2 Termination Method of Connection Cable (for Temp. Compensation)
Remove the external film & the
internal Black lm as beside gure
and solder the Y terminal after
compressing the Y terminal(1.5-
3Y) to the cable.
Wrap it with tube or tape after
soldering. Specially, wrap Shield
cable of R terminal with shrink
tube(Φ2.0) or tape in order to
prevent its exposure.
When moving external film &
internal black lm, be careful that
transparent film (G(M)) don’t be
damaged and, if the transparent
film is damaged, rework after
cutting the damaged part.
Terminal G(M) R T2 T1 T1
Cable Color Transparent Film(Core) Shield Cable White Red Yellow
Caution
•
Remove black lm as above gure certainly.
If not removed, G(M) terminal and R terminal will be short state, can not measure it since the
measured value will be xed around pH7 in pH measuring and the measured value will be xed
around 0mV in ORP measuring.

19
11-3 Handing method of Electrode Holder
The electrode holder is used for measuring pH value of liquid in the open tank. Electrode holder
is plastic pipe and functions as container which can ll in KCl liquid.
KCl liquid can be easily lled from top of electrode holder and sufcient KCl liquid can be stored
inside because whole pipe functions as container.
 In case of supplement free electrode, there is no need to rell KCl liquid and handling method is
similar to other electrodes.
11-4 Installation method of electrode & electrode holder
• Remove the tube(tape) which wrapped the rell hole of KCl.
※In case of supplement free electrode, it has no tube.
•Remove the protection tube from the end of the electrode.
•Insert electrode into the top of pipe and take it out from the bottom of pipe.
•Insert electrode into the rubber packing.
※Be careful not to insert it into the reverse side of the rubber packing.
•Insert rubber packing to which electrode is inserted into the bottom of pipe.
Immersion type for combination electrode
Temp. compensation electrode
Electrode Cable(4m)
Rocket type rubber plug
KCl container
Pipe(P.E)
Combination electrode
(pH:G type, ORP: M type)
Rubber packing
Washer(P.E)
Protection tube
Genernal standard electrode
has only G(M) & cable.
Electrode structure
Electrode holder(P.E)
Combination Electrode
pH:G type, ORP : M type
Inside solution : 3.3Mol-KCl liquid
(500cc P.E bottle)

20
•Put the Washer(P.E) on top of the rubber packing and fix the rubber packing by
inserting the protection tube.
※When inserting protection tube, tighten it in order to prevent leakage of internal
solution.
※When inserting electrode cable into electrode holder, don't make it tight but rather
loose. It is more convenient when relling internal solution & replacing electrode.
•Dissolve KCl powder in distilled water of 500cc and put it in beaker.
Take the rocket type rubber plug off and ll it into the top of electrode holder.
※ In case of supplement free electrode, there is no need to rell KCl liquid.
•
After relling KCl liquid, insert the rocket type rubber plug into electrode
holder by aligning the air vent of the electrode holder & the air vent of
the rocket type rubber plug.
※In case of supplement free electrode, special rubber plug is included.
Caution
•
Be careful not to apply excessive force when handling the electrode. If the glass electrode is
broken by excessive force, it may cause injury.
Item Problem Number of Cause &
Solution
A E.01 on screen (Electronic circuit board is not connected) 1, 2
B E.02 on screen (Electrode is not calibrated) 3, 4, 9
C E.03 on screen (Electrode signal Error) 3, 4, 5
D Reading on screen is not changed 3, 4, 5, 6, 7, 9
EMeasuring is difcult because reading is not steady 3, 5, 6, 7, 9
F The displayed temp. is far different from the actual temperature. (over ±5℃) 8
No. Cause Solution
1 Faulty circuit board connection Repair the controller
2 Damaged circuit board Repair the controller
3 Damaged electrodes & Electrode’s aging Exchange electrode
4 Shortage of Electrode solution Supplement of internal liquid
5 Fault of liquid to be measured Connecting terminal after removing obstacle
6 Poor quality of the measuring liquid Exchange the measuring liquid
7 The uid velocity of liquid to be measured is not steady Makes the uid velocity steady
8 Fault of temp. compensation circuit Exchange temp. compensation PCB
12
Cause & Solution of Problem