YD-3085 Online Hardness Tester User Manual

Chapter 1 Overview

YD-3085 Chinese OnlinehardnessJi, a highly intelligent online continuous monitoring instrument, consists of two parts: sensors and secondary meters.

Widely applicableMonitor water bodies such as rivers, lakes, surface water, waterworks, sewage treatment plants, and corporate wastewater dischargehardnessContinuous monitoring.

Basic functions

High intelligenceYD-3085 Chinese OnlinehardnessThe computer adopts high-precision AD conversion and single-chip microcomputer processing technology, which cancompletehardnessandMultiple functions such as temperature measurement, automatic temperature compensation, and instrument self-test.

high reliability：componentsIntegrated onto a single circuit board, without complex functional switches, adjustment knobs, and potentiometers.

Dual high impedance inputUsing components, the input impedance is as high as10¹²Ω, strong anti-interference ability;

Solution grounding：Eliminate interference from the ground circuit.

Current isolation outputAdopting optoelectronic coupling isolation technology, it has strong anti-interference ability and can be transmitted remotely;

RS485 communication interface：It can be conveniently connected to a computer for monitoring and communication.

Automatic temperature compensation: In0～99.9 ℃ automatic temperature compensation.

Waterproof and dustproof design：Protection levelIP65， Suitable for outdoor use.

Main Features

Chinese display, Chinese menu, Chinese notesAdopting a menu structure, similar to microcomputer operation,Easy to operateThe operation steps are fully explained in Chinese and can be easily completed without the need for an instruction manual.

Multi parameter display on the same screenDisplay on the same screenHardness value, input mV (or output current), temperature, time, and status, etc.

Multi functional and practical

historical curveAutomatically store measurement data every 5 minutes, capable of continuous storage for one monthhardnessValue. Provide two functions on the same screen: "historical curve" display and "timed fixed-point" query.

Notepad functionThe notebook faithfully records the operation and usage of the instrument and the time of alarm occurrence, making it easy to manage.

Monitoring electrode functionThe method, time, and results of each calibration are recorded for easy retrieval and analysis of electrode variation patterns.

digital clockfunctionProvide time benchmarks for various functions.

Excellent display modeA 192 × 64 dot matrix LCD screen with backlight was selected to display graphics and Chinese. Adjustable uniform background light allows for clear observation of operations even in dim outdoor conditions.

The instrument is stable and does not crashThe watchdog program ensures that the instrument operates continuously without crashing.

Manual current source function: Can check and set the output current value arbitrarily,Convenient for detecting recorders and lower level computers.

Four calibration methodsIn addition to the traditional one point and two-point calibration methods, there is also a manual input of zero point E₀Slope S and knownhardnessValue calibration to meet the needs of customers in various situations.

Chapter 2 Technical Indicators

1. Measurement range:hardnessValue: 0-5000 mg/L, division values of 0.1ug/L and 0.01mg/L;

Temperature range of 0-99.9 ℃, division value of 0.1 ℃;

Potential value–1999～+1999mV， Division value of 0.1mV;

3. Automatic temperature compensation range: 0-99.9 ℃, with 25 ℃ as the reference.

4. Accuracy: ± 2.5% of reading, ± 0.3 ℃.

5. The tested water sample has a temperature range of 0-99.9 ℃ and a pressure of 0.6Mpa.

6. Automatic temperature compensation error of electronic unit: ± 1.5%.

7. Electronic unit repeatability error: ± 2.5% of reading.

8. Stability: ± 1.5%/24h.

9: Clock accuracy: ± 1 minute/month.

10. Current isolation output: 4-20 mA (load<750 Ω).

11. Output current error: ≤± 1%FS.

12. Data storage quantity: 1 month (1 hour/5 minutes).

13. High and low alarm relay: AC220V, 7A.

14. Communication interface: RS485 (optional).

15. Power supply: AC220V ± 22V, 50Hz ± 1Hz; optional DC24V power supply.

16. Protection level: IP65.

17. Dimensions: 143 (length) x 143 (width) x 150 (depth) mm.

Hole size: 138×138mm。

18. Weight:1.0kg 。

19. Working conditions: ambient temperature 0-60 ℃, relative humidity<85%.

Note: 1. Temperature corresponding 4-20 mA current output is optional and must be specified when ordering. If there is no explanation, the output signal is a current output of the measured calcium ion value.

2. The secondary instrument can be equipped with a stainless steel outdoor installation box.

3. The electrode can be installed in a flow-through, submerged, or tubular manner.

onlinehardnessCalibration with one point standard solution, calibration with two points standard solution, and manual input of E₀、 Four methods for calibrating S and known concentration values are available for users to choose from.

One point calibration: Only one standard buffer solution is used to calibrate the electrode, and the slope of the electrode remains unchanged to obtain the zero potential of the electrode. This method can be used to simplify operations when measurement accuracy is not required.

Two point calibration: Use two standard buffer solutions to calibrate the electrode and obtain the slope and zero potential of the electrode. Use this method for calibration.

Manually enter E₀、 S: Given the known zero point and slope of the electrode, the E value of the electrode can be directly input₀、S。

Calibration of known concentration values: Laboratory comparison method is used, using the concentration values obtained in the laboratory as the standard for calibration. The slope of the electrode remains unchanged, and the zero potential of the electrode is obtained.