Successful development of a permanganate instrument based on a 7-inch Android system

Number

circuit

The name of the connected device

Equipment specifications

Design quantity

1

Motor control circuit

electrical machinery

1) Maximum power: not exceeding 20W.

2) Maximum current: not exceeding 0.6A.

3) Working voltage: DC 24V.

4) Control method: frequency control.

4 (4 interfaces on the expansion board)

2

Electromagnetic valve control circuit

solenoid valve

24V DC, 2-wire system, power<10W

6 (6 interfaces on the expansion board)

3

A 24 volt DC output circuit controlled by PID algorithm

heater

Heating power: 50W-85W

2

4

PT100 temperature measurement circuit

PT100

Temperature measurement range -50 to 500 ℃, accuracy ± 0.2 ℃

2

5

4-20mA output circuit

Output measurement results

Output error ± 0.5%, voltage directly connected to switching power supply (separate from other circuits)

2 (2 interfaces on the expansion board)

6

Photometer control circuit

1 LED light source;

2-way photoelectric sensor

See the technical parameters of LED lights

Technical parameters of photoelectric sensors

1

7

Switching output, also known as DO output circuit

Output alarm signals or control external devices

External equipment includes pumps, valves, etc

4 (4 interfaces on the expansion board)

8

Pulse output circuit

Connecting solid-state relays

Solid state relays emit switch signals of a certain frequency to control external metering equipment

2

9

Switching input, also known as DI input circuit

External relay

Dry contact (external input, control instrument executes corresponding actions)

4 (4 interfaces on the expansion board)

10

Data storage circuit

Solid State Drive

Erasable, data permanently saved, with a capacity of over 1GB

1

11

ISE electrode access circuit

ISE electrode

Electrodes with pH, conductivity, fluoride ions, chloride ions, etc

1

12

Orp electrode connection circuit

13

CANBUS bus interface

Reserved. Used to connect the full spectrum spectrophotometer module

undetermined

1

14

Communication circuit with ARM main control board

ARM main control board

standard

1