Charpter I Product Introduction

1.1 Brief Introduction

The dissolved Oxygen on-line analyzer is one of the intelligent on-line chemical analysis instruments, is widely used in thermal power, chemical fertilizers, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water and other solutions dissolved oxygen, saturation, oxygen partial pressure and temperature monitoring. This product uses the fluorescence method to dissolve the oxygen probe, the sensor product life is long, does not need the maintenance, the performance is good, the continuous monitoring data realizes the  remote  transmission  monitoring and the record through the transformation output connection recorder, also can connect RS485 interface through the MODBUS-RTU protocol can be easily connected to the  computer to achieve monitoring and recording.  At  the  same  time the equipment has 2-way relay interface, can set the alarm point output.

1.2 Function character

The probe of this product is a fluorescence probe, which uses the principle of fluorescence quenching to measure. The fluorescence method has been very active in recent years. It can overcome the shortcoming that the traditional methods can not

measure continuously on-line, free from magnetic field interference, no consumption electrode, high sensitivity, low detection limit, long life, in the sustainable on-line monitoring and other advantages have been widely used. With a wide measuring range, good linear, waterproof performance, easy to use, easy to install, board card Modular design, assembly configuration, using 2.4 inches 128 * 64 lattice screen, isolation transmission output, less interference, isolation of RS485 communication, measurement of dissolved oxygen, temperature measurement, upper and lower limit control, variable output, RS485 communication, configurable temperature manual, automatic compensation function, setting of high and low alarm function, and hysteresis, can be set Buzzer,  LCD  backlight switch function, increase the function of Universal Password.

1.3 Main parameter

Parameter name Parameter option

DC electric supply Electric consumption Measurement precision Measurement range

IONIC

resolution

12-24V DC

≤0.15W(@12V DC , 25℃) 3%F.s

0-20mg/L

0.01 mg/L

Output signal RS485(Mondbus protocol)/4-20mA

(choice)

  Repeatability ±2%  Probe size 155mm*12mm(length*diameter)

Temperature supply

-20℃-80℃(manual/automatic)

Response speed ≤15s

Relay alarm Two-way normally open normally

closed alarm relay

· Note:The default length of the probe cable is 5 meters.

1.4 Product usage topology

A typical aqueous solution control system is shown below, including an integrated system with the control box as the  core,  in which the control box is connected to a  dissolved  oxygen probe and the output acquisition processing is displayed, at the same time, the device can output RS-485 signal or analog signal  to the computer, PLC, SCM,  etc. . At the same time, the back- end of the relay can do a variety of relay control and alarm, can control the pump or valve and other equipment.

Charpter II Hardware connection

 2.1 Interface function(Main function)

On the back of the instrument, there are 14 terminals. Next  to each terminal is printed the number of  terminals.  The terminals have different functions, as shown in the following table

Terminal Main function:

  input minus

When in use, the probe wire will have a label on it, please follow the label, connect the warming wire to 12 and 14  Terminal (no polarity) , and connect the Electrodeplus to

Terminal 6, Electrode minus to Terminal 7, the Electrode connection has polarity, so please don't connect the reverse, if there is a shielded line, just connect the shield cable to the 14Terminal. Please take care not to connect in the wrong order, the wrong wiring will cause the equipment to burn out. Please  do not bring live products near the signal Terminal, which may cause trouble.

2.3 Interface function(Second function)

Because the control box has a wide range of uses and functions, there is a second function definition in some interfaces. Please note that the second function is optional in certain situations.

Terminal second function:

2.4 Control box installation

This instrument is disk mounted. Please install it indoors, away from wind, rain and direct sunlight. To  prevent  Temperature from rising inside the meter, install in a well- ventilated place. When installing this instrument, please do not  tilt left or right, as far as possible horizontal installation.

This instrument is equipped with Relay switch output. It is usually used as alarm prompt. If the user uses this function to participate in the loop control, if the instrument failure may lead to a major accident or damage to other equipment,  it  is  necessary to set up an emergency stop circuit and protection circuit complementary, otherwise the  consequences,  the company will not minus.

2.5 Electrode Installation

Electrodes are very sophisticated components that must be installed in the exact way plus is installed, and incorrect installation can result in Electrode damage or irreversible damage. The Electrode is installed using a pipe. Immersion. FLANGE CAN BE INSTALLED.

Please do not put electrodes directly into water. Select Electrode mounting bracket or flow cup  mounting. Be  sure  to use raw material tape (3/4 thread) for waterproof sealing before installation to avoid water entering Electrode  and  short  circuit of Electrode cable.

Make  sure your Electrode is immersed in the test solution   or wearing a protective cap with built-in protection during a long-term cold shutdown in winter. Add an antifreeze or bring back water for storage. Otherwise, it will shorten the service life.