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S-SCEC online conductivity sensor
● Automatic temperature compensation range: 0-99.9 ℃, with 25 ℃ as the reference ● Electronic unit repeatability error: ± 0.2% ● Stability: ± 0.2% ● C
Product details
1. Product Introduction
1.1 Product Overview
S-SCEC is our company's agricultural conductivity sensor, which has strong environmental adaptability, clear display, simple operation, and excellent testing performance, making it highly cost-effective. It can be widely used for continuous monitoring of conductivity values in solutions such as thermal power, chemical fertilizers, metallurgy, environmental protection, pharmaceuticals, biochemistry, food, and tap water.1.2 Functional Features
- High intelligence: Using high-precision AD conversion and single-chip microcontroller microprocessor technology, it can complete various functions such as conductivity and resistivity values, temperature measurement, and automatic temperature compensation.
- Time display: The Chinese online EC meter has a built-in clock chip that can display the current time.
- Data storage: The built-in storage chip of the instrument can save historical data from the past two days, making it convenient for users to search.
- Flushing relay: The instrument is equipped with a flushing relay, which can be installed with an electromagnetic valve to regularly clean the conductivity electrode.
- 25 ℃ Conversion: The conductivity value at the current temperature is converted to 25 ℃, achieving the display of the conductivity value at 25 ℃, which is particularly suitable for measuring various water qualities in power plants.
- Strong anti-interference ability: using the latest devices with impedance up to 10-12 Ω; The current output adopts photoelectric coupling isolation technology, which has strong anti-interference ability and achieves remote transmission. Has good electromagnetic compatibility.
- Simultaneous display of multiple parameters: Display time, conductivity or resistivity value, temperature, and output current value simultaneously on the LCD screen. Adopting a high brightness 128 * 64 LCD display module, it is eye-catching and has a long visible distance.
- RS485 communication interface: MODBUS RTU communication protocol can be easily connected to a computer for monitoring and communication.
- Industrial control watchdog: ensures that the instrument does not crash.
1.3 Technical indicators
| Technical Specifications | technical indicators |
| execution standard | JB/T6855-93 "Industrial Conductivity Meter" |
| Conductivity measurement range | 10.0μS/cm～20.0mS/cm |
| Basic error of electronic unit | Conductivity ± 0.5% FS, temperature ± 0.5 ℃ (0-60 ℃) |
| Basic instrument error | Conductivity ± 1.0% FS, temperature ± 1.0 ℃ (0-60 ℃) |
| Tested water sample | 0～99.9℃，0.6MPa |
| Automatic temperature compensation range | 0-99.9 ℃, based on 25 ℃ |
| Repetitive error of electronic unit | ±0.2% |
| Stability | ±0.2% |
| Current isolation output | 4～20mA |
| Output current error | ≤±1%FS |
| High and low alarm relay | AC220V、3A |
| data storage | 60 points, 2-day data |
| RS485 communication interface | MODBUS RTU protocol; Isolation (optional) |
|
power supply |
AC220V ± 22V, 50 ± 1Hz; optional DC24V ± 2.4V |
| Protection level | IP54 |
| Overall dimensions | 96 (length) x 96 (width) x 110 (depth) mm |
| cutout size | 92×92 mm |
| Instrument weight | Transmitter: 0.8kg |
| working conditions | Environmental temperature: 0-60 ℃ Relative humidity:<85% |
| Electrode wire length | Standard 5-meter configuration |
- Product Selection
| S- | Company Code Name | ||||
| SCEC- | Conductivity controller | ||||
| N01- | 485 communication | ||||
| B- | Cabinet mounted square digital display shell | ||||
| 201 | 10.0 Conventional Composite Electrode | ||||
- 485 communication protocol
- Basic communication parameters
| code | 8-bit binary |
| data bit | 8 digits |
| parity bit | none |
| stop bit | 1 person |
| Error verification | CRC (Redundant Cyclic Code) |
| Baud rate | Can be set, factory default is 4800bit/s |
- Definition of Data Frame Format
The time for the initial structure to be ≥ 4 bytes
Address code=1 byte
Function code=1 byte
Data area=N bytes
Error check=16 bit CRC code
Time to end structure ≥ 4 bytes
Address code: It is the address of the transmitter and is unique in the communication network (factory default 0x01).
Function code: The instruction function indication issued by the host.
Data area: The data area contains specific communication data, please note that the high byte of 16 bits data comes first!
CRC code: a two byte checksum.
Host query frame structure:
| address code | function code | valid byte count | Data Zone 1 | Data Zone 2 | Data Zone N | Low byte checksum | High byte checksum |
| 1 byte | 1 byte | 1 byte | 2 bytes | 2 bytes | 2 bytes | 1 byte | 1 byte |
| address code | function code | Register starting address | register length | Low byte checksum | High byte checksum |
| 1 byte | 1 byte | 2 bytes | 2 bytes | 1 byte | 1 byte |
- register address
| register address | PLC or configuration address | content | operation | Definition Description |
| 0000 H | 40001 (decimal) | Conductivity high sixteenth digit |
read-only |
Unit: US/cm (Expanded by 100 times) |
| 0001 H | 40002 (decimal) | Low conductivity by sixteen digits | ||
| 0005 H | 40006 (decimal) | temperature value | read-only | Actual temperature value (increased tenfold) |
Example: Read device address0x01The conductivity and temperature values
Inquiry frame:
01 03 00 00 00 06 C5 C8
Response frame:
01 03 0C 00 06 20 92 00 00 00 18 00 00 00 FA 99 B5
Calculation of conductivity and temperature values:
Conductivity: 00062092 (hexadecimal)=401554 (decimal)=>Conductivity=4015.54 us/cm
Temperature value: 00FA (hexadecimal)=250 (decimal)=>Temperature value=25.0 ℃
- Precautions and Maintenance
- Secondary watches generally do not require daily maintenance. In case of obvious malfunctions, please do not open them for self repair and contact us as soon as possible!
- After starting the power supply, the instrument should display. If there is no display or the display is abnormal, the power should be turned off immediately, and the power supply and fuse should be checked for normal operation.
- The cable connector must be kept clean and free from moisture or water, otherwise the measurement will be inaccurate.
- The electrodes should be cleaned regularly to ensure they are not contaminated.
- Calibrate the electrodes periodically.
- During the water outage, it is important to ensure that the electrodes are immersed in the tested liquid, otherwise their lifespan will be shortened. The performance of conductivity sensors largely depends on the maintenance of the electrodes.
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