Features and Applications:
The DDG-8250 conductivity meter adopts MCU technology for digital measurement and transmission. Using a 12864 dot matrix LCD display and a fully English operation menu, it is widely used for online conductivity measurement and monitoring of water production equipment in industries such as electronics, chemical, pharmaceutical, power, circulating water, and drinking water.

Main technical performance:
·Measurement range: 0.00~20.00mS/cm, of which: 0~20.00μS/cm、0~200.0μS/cm、0~2000μAutomatic switching between four ranges of S/cm and 0-20.00 mS/cm;
·Temperature compensation: This instrument has automatic temperature compensation, with a compensation range of 0-60 ℃ and a compensation reference of 25 ℃. The temperature compensation component is NTC10K Ω;
·Display mode: Select 12864 dot matrix backlit LCD display, display conductivity value, corresponding TDS value, current temperature value, date clock and other parameters on the same screen, effective display size: 54 × 36 (mm);
·Measurement accuracy: ± 1% (F · S);
·Electrode configuration: Three specifications of stainless steel electrodes, 0.1 cm-1, 1.0 cm-1, and 10.0 cm-1, with a 4 'pipe threaded connection and a standard wire length of 5m;
·Alarm control output: This instrument has conductivity upper and lower limit alarm settings and dual contact control signal output. Contact capacity: 220VAC/7A;
·Current signal output: This instrument has a standard isolated 4-20mA forward or reverse current signal output. The operating values of 4mA and 20mA can be set arbitrarily according to user requirements to ensure output accuracy and output load ≥ 500 Ω;
·RS-232C communication interface output: This instrument has a standard RS-232C serial port output, which can be connected to intelligent instruments with this interface to achieve the transmission and recording of measurement data. Such as computers, printers, etc;
·Real time clock function: This instrument has a real-time clock function, which can record measurement data in real time;
·Instrument power supply: This instrument has a choice of 220AC or 24VDC power supply (confirmed by the user when ordering);
·Instrument size:
Frame size: 96 × 96 (mm)
Hole size: 91 × 91 (mm)
Instrument depth: 100 (mm) Product inspection basis: Q /TDCB01-2007；

DZG-8251 resistivity meter

survey: 　The DZG-8251 resistivity meter adopts MCU technology for digital measurement and nonlinear temperature curve compensation. Using a 12864 dot matrix LCD display and a fully English operation menu, it is widely used for measuring and monitoring the online resistivity value of high-purity water in water production equipment in industries such as chemical, pharmaceutical, and power. Main technical performance: ·Measurement range: 0.00~18.25M Ω· cm; （0~20.00μS/cm） ·Temperature compensation: with automatic temperature compensation, compensation range of 0-60 ℃, compensation reference of 25 ℃, temperature compensation component: NTC10K Ω; ·Display mode: Select 12864 dot matrix backlit LCD display, display resistivity value, corresponding conductivity value, current temperature value, date clock and other parameters on the same screen, effective display size: 54 × 36 (mm); ·Measurement accuracy: ± 1% (F · S); ·Electrode configuration: 0.01 stainless steel electrode, 4 'pipe thread, standard wire length of 5m; ·Alarm control output: This instrument has a lower limit alarm setting for resistivity or upper limit alarm setting for conductivity, as well as control contact signal output, Contact capacity: 220VAC/7A; ·Current signal output: This instrument has a standard isolated 4-20mA forward or reverse current signal output. The operating values of 4mA and 20mA can be set arbitrarily according to user requirements to ensure output accuracy and output load ≥ 500 Ω; If selecting to display the resistivity value, output the current signal corresponding to the resistivity value; When selecting the conductivity value display, output the current signal corresponding to the conductivity value; ·RS-232C communication interface output: This instrument has a standard RS-232C serial port output, which can be connected to intelligent instruments with this interface to achieve the transmission and recording of measurement data. Such as computers, printers, etc; ·Real time clock function: This instrument has a real-time clock function, which can record measurement data in real time; ·Instrument power supply: 220VAC ± 10%?? 50Hz； ·Instrument size: Frame size: 96 × 96 (mm) Hole size: 91 × 91 (mm) Instrument depth: 100 (mm) · Product inspection basis: Q/TDCB02-2007；

Features and Applications:
The DDB-303 conductivity meter (hereinafter referred to as the instrument) is a laboratory instrument used to measure the conductivity of aqueous solutions. It is widely used in industries such as petrochemicals, biomedicine, water treatment, environmental monitoring, mining and smelting, as well as in colleges, universities, and research institutions. If equipped with appropriate constant conductivity electrodes, the conductivity of pure water in electronic semiconductors, nuclear energy industry, and power plants can also be measured.
The main features of the instrument are as follows:
·Powered by 6F22 (9V) dry batteries, it is easy to carry and can be used in the field with low power consumption. A new battery can be used continuously for more than 100 hours.
·Adopting a 31/2-digit LCD digital display, it has a beautiful appearance and clear display.
·Three types of constant electrodes (0.01, 1.0, 10) can be selected to measure the conductivity of general aqueous solutions as well as pure water.
The main technical performance of the instrument:
·Measurement range: The measurement range of the instrument is (0~19990 μ S/cm)
·The measurement ranges corresponding to the three electrode constants (0.01, 1.0, 10) are shown in the table below:

The instrument is equipped with a conductivity electrode with a constant K=1 when it leaves the factory. The electrodes with electrode constants K=10 and K=0.01 are optional items for users.
Note: When measuring high conductivity, a conductivity electrode with a constant of 10 should be used when the conductivity is ≥ 2000 μ S/cm. When measuring low conductivity, it is recommended to use a conductivity electrode with a constant of 0.01 when the conductivity is ≤ 1.0 μ S/cm.
·Basic error of electronic unit: ± 1.0% (FS) ± 1 word.
·Basic instrument error: ± 1.5% (FS) ± 1 word.
·Stability error of electronic unit: ± 0.66% (FS) ± 1 word/3h.
·Electronic unit repeatability error: ± 0.33% (FS) ± 1 word.
·Dimensions l × b × h (mm): 135 × 70 × 30.
·Weight: 0.3kg.
·Normal usage conditions:
(a) Environmental temperature: (5-35) ℃;
(b) Relative humidity: not exceeding 85%;
(c) Power supply: DC6F22
(d) 9V battery; No significant vibration;
(e) There is no external magnetic field interference except for the Earth's magnetic field.