DDG-2090D2 Dual-Channel Water Conductivity Monitoring Meter
DDG-2090D2
Dual-Channel Conductivity Meter
User Manual
Operation Introduction
This manual contains all the operating details of the instrument. The following brief operating instructions are used to help the user learn to operate the instrument as soon as possible.
1. Instrument installation: Fix the instrument on the panel of the instrument cabinet or in the instrument box to prevent direct sunlight or water dripping. Connect the power cable and do not energize first;
2. Electrode installation: According to the site requirements, the electrode should be in flow-through type (for distribution with flow cell) and submerged (with submerged sheath tube, please do not immerse the electrode cable directly in the solution!!!), pipeline Type (with stainless steel or PVC mounting base, etc.), flange type (with custom flange), reactor installation (supporting reactor jacket and mounting kit) or other installation methods, please refer to P3-P5 page reference;
3. Connect the terminal of the electrode to the terminal of the instrument according to the marked number;
4. Turn on the power, enter the instrument parameter menu, set the parameters according to the conductivity measurement range and the constant value of the conductivity electrode (the basic setting has been completed before leaving the factory), and the measurement state can be entered after the setting is completed.
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Important Safety Info
Please read and observe the following:
When the instrument is selected to use 85 to 265VAC power supply, there is a high voltage on the outside of the instrument shell, which may lead to danger. Be sure to disconnect the power supply in the area near the instrument.
The wiring or repair should be completed by professional personnel, and only wiring and repair of the blackout instruments.
Once the instrument has safety problems, the power supply should be cut off immediately to prevent any unintentional operation.
For example, the following circumstances may be insecure:
1) apparent damage to the instrument;
2) the instrument can not operate normally or provide the specified measurement;
3) the instrument has been stored for a long time in the environment over 50 degrees centigrade.
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Content
Chapter 7 Detailed operation description 8
Chapter 1 Overview
Industrial online EC/EC dual channel online monitor (hereinafter referred to as instrument) is a water quality online monitor with microprocessor. The meter is equipped with different types and constant constant conductivity electrodes for continuous monitoring and control of the conductivity value and temperature value of the aqueous solution. Widely used in power plants, petrochemical, metallurgy, paper, environmental water treatment, light industry electronics and other fields. Such as power plant cooling water, make-up water, saturated water, condensate and furnace water, ion exchange, reverse osmosis EDL, seawater distillation and other water equipment monitoring and control of raw water and product water quality.
The instrument adopts LCD liquid crystal display; intelligent Chinese menu operation; with current or voltage output, free measurement range, high and low over limit alarm prompt and two sets of relay control switches, adjustable hysteresis range; automatic or manual temperature compensation;
According to the needs of users, we can provide conductivity electrodes in various forms of installation procedures such as [flow-through] [pipeline] [submerged] [flange].
Chapter 2 Structural features and working principles
2.1 Structural features
The whole measurement system is mainly composed of two parts: the meter and the conductivity electrode. The electrode contacts the measured solution, and the meter displays the conductivity value, temperature and working state of the tested aqueous solution.
2.2 Working principles
Conductivity measurement principle: In order to avoid electrode polarization, the instrument generates a high-stability sine wave signal applied to the electrode. The current flowing through the electrode is proportional to the conductivity of the measured solution. The meter converts the current into a high-impedance operational amplifier. After the voltage signal, the programmable signal is amplified, phase sensitively detected and filtered to obtain a potential signal reflecting the conductivity; the microprocessor switches the temperature signal and the conductivity signal alternately by switching, and after being calculated and temperature compensated, the measured value is obtained. The conductivity value of the solution at 25℃ and the current temperature value.
Principle of temperature compensation: The conductivity of the electrolyte solution is affected by temperature changes and temperature compensation is required. The temperature coefficient of the weak aqueous solution is 2.00%℃. The higher the concentration, the smaller the temperature coefficient. The temperature coefficient for the lower concentration (1 μS·cm -1 ) solution is not 2.00%℃, but is set by the user and ranges from 0.00 to 9.99%.
Chapter 3 Technical indexes
1. Conductivity measurement range (range can be set freely):
Conductivity: 0 ~ 20uS/cm (K = 0.01); 0 ~ 200uS/cm (K=0.1);
0 ~ 2,000 uS/cm (K=1.0); 0 ~ 20,000 uS/cm (K=1.0);
0~ 20.0; (K=10.0); 0 ~ 200.0 mS/cm(K=30.0);
TDS: 0 ~ 100000mg / L;
Temperature measurement range: 0~150℃(meter display temperature, the actual use according to the configuration electrode);
2. Resolution: Conductivity: 0.01uS; 0.01 mS;
TDS: 0.01 mg/L; temperature: 0.1℃;
3. Basic error of the instrument: Conductivity / TDS: ±1.0% FS ±1word,
temperature: ±0.3℃;
4. Electronic unit automatic or manual temperature compensation range: 0 ~ 150℃(reference temperature 25℃);
5. Electronic unit automatic temperature compensation error: ±0.3% F.S;
6. Electronic unit stability: ±0.1% F.S ± 1 word / 24h;
7. Repeatability error of the electronic unit: ≤0.1%F.S±1 word;
8. Electronic unit alarm error: ±1%F.S;
9. Electronic unit output current error: ±1%F.S;
10. Signal output: 0~10mA (load resistance <1.5KΩ); 4~20mA (load resistance <750Ω);
11. Two sets of relay control contacts: 4A 250VAC, 4A 30VDC;
12. Power supply: 85 ~ 265VAC ± 10%, 50 ± 1Hz, power ≤ 3W;
9～36VDC, power ≤3W (required);
13. Dimensions: 96 × 96 × 130mm;
14. Installation method: panel mounted (embedded); opening size: 91 × 91mm;
15. Instrument weight: 0.6kg;
16. Working environment:
1) Ambient temperature: -10 ~ 60℃;
2) Relative humidity: no more than 90%;
3) There is no strong magnetic field interference around the earth's magnetic field.
Chapter 4 Function features
u Intelligence: Conducting conductivity and temperature measurement and compensation using a single-chip microprocessor;
u High-impedance preamplifier: high input impedance, anti-noise, strong anti-interference ability;
u Human-machine dialogue: menu operation structure, the user can operate according to the prompt on the screen;
u Multi-parameter display on the same screen: display conductivity value, temperature value and working status at the same time;
u Output signal: software selects 0~20mA or 4~20mA or 20~4mA output;
The measurement range and the upper and lower limits of the alarm are freely set; the upper and lower limits are over-limit alarm prompts;
u Two sets of relay control switches, the hysteresis control range is adjustable;
u Self-set password: Users can set or change their passwords to avoid accidents caused by unrelated personnel.
Chapter 5 Installation and electrical connection
The instrument should be installed in the room or with a protective device, and no inflammable and explosive materials should be placed around it. The location of instrument installation should be convenient for users and installation and maintenance personnel to read the instrument nameplate and screen information so as to be easy to use, maintain and repair.
All power and pipeline connections must be in accordance with national and local standards. The front end of the instrument power must be installed the insulation switch or the circuit cut switch.
In order to avoid security and external signal interference on instrument, instrument power line should be connected to the corresponding specification, with wire mark, with socket electric appliance standard, and to ensure good grounding wire.
5.1 Meter installation
The instrument can be embedded and installed on the plate, and the size of the opening is 91 * 91mm. Insert the instrument into a square hole and fix it with a configured bracket
Pic 1 Meter overall dimension Opening hole dimension
5.2 Electrode installation
1. Flow-through type (Use soft or hard tube to connect)
2. Flange type
3. 
Pipeline type
Pipeline type
4. Top plug-in installation: insert the electrode directly into the small reactor
5. 
Submerged installation type:
Submerged installation type:
IMPORTANT: Pass the cable through the sheath tube. The tail thread of the electrode is screwed into the sheath tube (waterproof with a waterproof tape, etc.). If two sheath tubes are used, the connection between the two sheath tubes is used. Be sure to waterproof, prevent the aqueous solution from penetrating into the sheath tube and corrode the cable. Fix the sheath tube on the fixed bracket. The top of the sheath tube is covered with a black waterproof rubber cap to prevent rainwater from entering the sheath tube from the top.
5.3 Meter terminal wiring
Pic 3 Meter wiring
Important notice: if the user will be removed the original electrode cable wiring cable or cable after shortening, attention will be the inner end of transparent wire (electrode +) conductive black skin and removing clean, and prevent the electrode end short-circuit phenomenon, can use a multimeter to check, please make a connection with the special cable.
1
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alarm closed 1
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Relay high alarm normally close contact 1
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2
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alarm open 1
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Relay high alarm normally open contact 1
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3
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Alarm common
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Relay public contact
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4
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alarm closed 2
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Relay low alarm normally close contact 2
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5
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alarm open 2
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Relay low alarm normally open contact 2
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6
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Ground
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Power supply earth line
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7
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Power supply L/DC+
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AC- Fire line L/ or DC＋
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8
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Power supply N/DC-
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AC- Zero line N/ or DC-
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9
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INPUT 1
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Conductivity electrode 1
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10
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REF 1
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Conductivity electrode 1
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11
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TEMP 1
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Conductivity electrode temp 1
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12
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TEMP 1
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Conductivity electrode temp 1
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13
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TEMP 2
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Conductivity electrode temp 2
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14
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TEMP 2
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Conductivity electrode temp 2
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15
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REF 2
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Conductivity electrode 2
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16
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INPUT 2
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Conductivity electrode 2
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17 ~ 21 Empty
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22
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Current 1
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Current output public terminal 1+
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23
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Current common
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Current output public terminal -
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24
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Current 2
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Current output 2+
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25
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Communication A+
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RS485 Communication interface A+
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26
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Communication B-
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RS485 Communication interface B-
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5.4 Electrical connection
Connect the meter and electrode: connect the power supply, the output signal, relay contacts and instrument base plate, electrode fixed cable wire length conventional 5-10 meters, the electrode terminal is inserted into the roof of the same instrument digital symbol terminal can be tightened, according to figure three wiring.
Chapter 6 Function keys description
The panel has 6 touch key and they are: Esc 、←、→、↑、↓and Enter .
Esc: shift between the measurement screen and menu screen or return to the previous menu and status from the menu screen or cancel the input data
← : move to the first menu item or move the cursor to the left when the data is input
→ : move to the last menu item or move the cursor to the right when the data is input
↑ : move the menu upward or numerical value increases
↓ : move the menu downward or numerical value decreases
Enter: Choose or confirm the menu item and finish the data input or confirm certain status.
Chapter 7 Detailed operation description
7.1 Power-on:
Before the meter is used, check all the pipe connection and the electric connection. After the power supply is connected, the meter displays as shown in below left, In over serval seconds, meter will enter into measurement main display.
Pic 4 Meter boot and meter screen main display
Among them, the conductivity value 1 and the conductivity value 2 are main displays, and the temperature, state and current values are sub-displays.
Status display information: 1. High alarm 2. Low alarm, will be displayed when the limit is exceeded, no display when normal.
7.2 Main menu
While in the main display status, press ESC key will enter main menu. It display like below:
Pic 5 Main menu
7.3 Sub menu
All the parameters under the sub-menu should be checked before measuring, otherwise it will run by the preset values. Move the cursor to the “1.parameters” sub-menu and press ENTER key, a password will be requested(preset password is 0000). When enter this sub-menu, using ↑ or ↓ key move the cursor, press ENTER key to modify the sub parameters.
IMPORTANT NOTICE: When input password or digital parameter modification,please use ↑ or ↓ to change the number “0～9”\” minus”&”point”
Method of adjusting backlight: when the instrument is shown in Figure four right, according to the "left" button, appear black and white squares background, and then press "up" or "down" the backlight control instrument, each time the adjustment time, transferred to the appropriate date, according to "exit" button to exit the main display.
7.4 Parameter description
1) Display mode: EC, TDS combination supports 3 kinds of display, EC+EC, EC+TDS, TDS+TDS
2) Electrode constant: K(J) indicates the actual electrode constant of the current conductivity electrode. Before use, according to the measurement range determined at the time of ordering, the electrode constant (setting) marked on the electrode must be input into the instrument parameters.
3) "Unit selection": It is used to set the unit of conductivity main display. When μS·cm-1 unit is selected, it will automatically switch to mS·cm-1 when the conductivity is greater than 9999μS·cm-1. This function does not work when TDS measurement is selected.
4) "A1 alarm": used to set the alarm type corresponding to the first conductivity relay.
5) "A1 type": Set the first relay output to high alarm or low alarm.
6) "A1 alarm value": Set the first channel conductivity relay alarm value.
7) "A1 hysteresis value": Set the alarm hysteresis value of the 1st conductivity relay.
8) "A2 alarm": used to set the alarm type corresponding to the second conductivity relay.
9) "A2 type": Set the 2nd conductivity relay output to high alarm or low alarm.
10) "A2 alarm value" sets the 2nd conductivity relay alarm value.
11) "A2 hysteresis value": Set the alarm hysteresis value of the 2nd conductivity relay.
12) "I1 channel": used to set the corresponding category of the first current value;
13) "I1 type": used to set the first way current value output mode, 0-20mA, 4-20mA, 20-4mA.
14) "I1 upper limit": used to set the first current to the upper limit.
15) "I1 lower limit": used to set the first current to the lower limit.
16) "I2 channel": used to set the corresponding category of the 2nd current value;
17) "I2 type": used to set the second way current value output mode, 0-20mA, 4-20mA, 20-4mA.
18) "I2 upper limit": used to set the second current to the upper limit.
19) "I2 lower limit": used to set the second current to the lower limit.
20) "T1 temperature": used to set the first temperature to conductivity 1 Temp, conductivity 2 Temp, manual, unmatched, no temperature is displayed when unmatched.
21) “T1 Manual”: This sets the artificial temperature value when the “T1 Temperature” option is manual.
22) "T2 temperature": used to set the second way temperature as conductivity 1 Temp, conductivity 2 Temp, manual, unmatched, no temperature is displayed when unmatched.
23) “T2 Manual”: This sets the artificial temperature value when the “T2 Temperature” option is manual.
24) “Backlight selection” and “Backlight time”: The backlight can be set to be always on or energy saving. When energy saving is selected, it can be set.
25) Set the backlight to illuminate for 1-999 seconds.
26) "Filter coefficient": used to set the frequency of instrument signal acquisition, the maximum is 2.00, the minimum is 0.1. The smaller the value, the faster the acquisition frequency, and vice versa. If the meter is unstable due to interference or other reasons in some occasions, you can set the “filter coefficient” to 2 to slow down the instrument acquisition frequency and reduce the interference stability.
27) "Table No.": For the setting of the instrument for communication, 1-32.
28) “Baud Rate”, “Parity”, “Stop Bit”: used to set RS485 communication parameters.
29) "Product Code": used to set the factory number of the current instrument.
7.5 Calibration
Conventional use does not require calibration.
“Standard solution calibration”: Electrode calibration is performed according to the standard solution with similar electrode and measurement range configuration.
“Site calibration”: Calibration can be performed based on the measurement data of a highly accurate laboratory or portable instrument. The calibration data is reflected in the “Field Compensation” data in the parameter menu.
Chapter 8 Check and maintenance menu
8.1 Current output checking
This function is mainly used for the detection and correction of the output current. Please correct it without affecting the use of the data. The ammeter or multimeter can be connected to the output terminal of the instrument to select or calibrate or test the first or second current values, for example, the instrument output is not abnormal. Please don't change the calibration value arbitrarily. Use the upper, lower, left and right keys to adjust the output current, until the size of the output is in accordance with the size of the instrument display.
8.2 Test relay checking
This function is used to test the output of the alarm control relay. According to the upper key high alarm: disconnect or connect; press down the down key: disconnect or connect (can hear the relay working sound).
When the rated current of the load is less than the current under the relay, it can be connected according to the left chart (the power supply can not exceed 220V).
When the rated current of the load is greater than that of the relay, an AC contactor is added to the relay.
8.3 Modify the password
After entering the sub-menu, first enter the original password (the initial password is 0000), then enter the new password, then press "confirm" to complete the user password modification. Four bit passwords can be set up at most. Please keep in mind the password set!
8.4 Input signal check
This function is used by the manufacturer for analog debugging.
8.5 factory recovery
This function is used to restore the parameter data set by the user and the calibrated data.
8.6 After sales service
This menu shows the contact details of the production vendor.
8.7 Verification of electronic units
Users generally do not adjust the meter (electronic unit) by themselves. If there is any error or malfunction, you can contact the company and carry out the repair under the guidance of the technician. If the user has doubts about the meter, you can remove the connection line between the meter and the conductivity electrode. Connect the resistor box to the 11-pin and 12-pin of the corresponding thermistor (Temp) and the 9-pin and 10-pin on both ends of the electrode. Analog verification. First set the temperature coefficient of the meter to 0.00%, and calculate the exact value of the conductivity according to the following formula:
S=106×K/R
Where: S__ conductivity value, unit: μS·cm-1
K__electrode constant, unit: cm-1
R__ resistance box value, unit: Ω
For example, if a 10KΩ resistor is input with a resistor box and the meter electrode constant is set to 0.1cm-1, the theoretical conductance value is S=106×0.1/10000=10μS·cm-1, and the difference between the instrument value and 10μS·cm-1 should be Less than or equal to the basic error. This instrument uses NTC_ temperature coefficient thermistor to measure and compensate temperature using two-wire system.
The table below shows the resistance and conductivity correspondence table (set the instrument "parameter" - "temperature coefficient" to 0.00%, "temperature mode" to "NO" state, "electrode constant" corresponds to K in the table)
K=0.01
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K=0.1
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K=1
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Resistance
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Conductivity
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Resistance
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Conductivity
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Resistance
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Conductivity
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50K
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0.200
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50K
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2.000
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50K
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20.00
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40K
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0.250
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40K
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2.500
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40K
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25.00
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30K
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0.333
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30K
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3.333
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30K
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33.33
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20K
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0.500
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20K
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5.000
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20K
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50.00
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10K
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1.000
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10K
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10.00
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10K
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100.0
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5K
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2.000
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5K
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20.00
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5K
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200.0
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2K
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5.000
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2K
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50.00
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2K
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500.0
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1K
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10.00
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1K
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100.0
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1K
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1000
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500
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20.00
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500
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200.0
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500
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2000
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NTC2.252K temperature and resistance correspondence table:
Resistance box resistance
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Temp
(℃)
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Resistance box resistance
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Temp
(℃)
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7352.90
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0.0
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1814.51
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30.0
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4481.09
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10.0
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1199.72
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40.0
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2813.11
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20.0
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811.42
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50.0
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2252.00
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25.0
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560.34
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60.0
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Chapter 9 Daily maintenance
It is best to check the meter once a year. If the user is unconditionally, it can be sent to our company for verification. The conductivity electrode can determine the maintenance period of the cleaning electrode according to the degree of cleanness of the water sample, and it should be ensured that there is no contamination deposition on the inner and outer surfaces of the electrode. For stainless steel conductivity electrode and platinum conductivity electrode, if it is found to be contaminated, it should be cleaned in time, brushed with 50% warm detergent (or household soap powder) and nylon brush, then rinse the inside of the electrode with distilled water to ensure the surface of the inner and outer electrodes. No grease deposits. Do not touch the conductivity electrode with your fingers; the deposit with strong adhesion can be cleaned with 2% dilute hydrochloric acid solution and then rinsed with clean water; for platinum black conductivity electrode, if it is found to be contaminated, it should be cleaned in time. Do not use brush or To wash the electrode head with other substances, just rinse the electrode head with clean water; keep the cable and connector plug dry to ensure reliable contact.
Chapter 10 Packing list
Name
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Qty
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1 EC/EC Dual channel EC meter
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1
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2 EC electrode 1 with cable
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1
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3 EC electrode 2 with cable
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1
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4 Meter fixed accessory
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2
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5 Operation manual
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1
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6 Certificate
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1
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