JUMO Controller 202568/20-888-888-000

JUMO Controller 202568/20-888-888-000

Case 1: Industrial water treatment - pH/conductivity monitoring and dosing linkage of circulating water

1. Application scenariosThe circulating water system of the chemical plant needs to stabilize the pH (7.0-8.5) and conductivity (≤ 3000 μ S/cm) to prevent corrosion and scaling, and to link the acid/alkali dosing pump and drain valve.

2. Solution Configuration

• Controller: 202568/20-888-888-000 (dual relay output).

• Sensors: JUMO tecLine pH electrode (4-20 mA), conductivity sensor (4-20 mA).

• Executors: dosing pump (controlled by relay 1), drain valve (controlled by relay 2).

3. control logic

• PH<7.0 → Relay 1 starts alkaline dosing; PH>8.5 → Start acid dosing; Conductivity>3000 μ S/cm → Relay 2 triggers discharge.

• The panel LCD displays real-time values and bar charts, and the alarm threshold is linked with sound and light prompts.

4. Key points of implementation

• Select 4-20 mA signal input, range matching sensor (pH 0-14, conductivity 0-5000 μ S/cm).

• The relay is set to "upper/lower limit trigger", with a 2-second action delay to prevent false alarms.

5. Application EffectivenessThe dosing accuracy has been improved by 15%, the discharge frequency has been reduced by 20%, the maintenance cycle has been extended to 6 months, and manual intervention has been reduced by 80%.

Case 2: Food and Beverage - CIP Cleaning System Temperature and Liquid Level Safety Control

1. Application scenariosThe CIP cleaning station of the dairy factory monitors the temperature of the cleaning solution (60-80 ℃) and the liquid level of the storage tank (low level protection, high level overflow alarm) to ensure cleaning effectiveness and equipment safety.

2. Solution Configuration

• Controller: 202568/20-888-888-000.

• Sensors: PT100 temperature transmitter (4-20 mA), JUMO capacitive level switch (4-20 mA).

• Actuators: heater (relay 1), inlet valve (relay 2).

3. control logic

• Temperature<60 ℃ → Relay 1 starts heating; >80 ℃ → Stop heating.

• Liquid level<20% → Relay 2 closes the inlet valve and alarms (dry operation protection); >90% → Close the inlet valve (overflow protection).

4. Key points of implementation

• Compliant with EHEDG/3A hygiene certification, the sensor and actuator are connected in a hygienic manner.

• The panel is set to switch between manual/automatic mode, and the manual mode can be quickly adjusted when switching the cleaning program.

5. Application EffectivenessThe temperature fluctuation of the cleaning solution is controlled within ± 1 ℃, with no overflow/dry operation accidents and a 100% cleaning qualification rate.

Case 3: Pharmaceutical Industry - Reactor Temperature and Pressure Safety Monitoring

1. Application scenariosAPI synthesis reactor, monitoring temperature (80-120 ℃) and pressure (≤ 0.5 MPa), emergency shutdown and pressure relief to ensure production safety.

2. Solution Configuration

• Controller: 202568/20-888-888-000.

• Sensors: thermocouple temperature transmitter (4-20 mA), pressure transmitter (4-20 mA).

• Actuators: heating system (relay 1), pressure relief valve (relay 2).

3. control logic

• Temperature ＜ 80 ℃ → Heating; ＞ 120 ℃ → Relay 1 cuts off heating, relay 2 starts pressure relief.

• Pressure>0.5 MPa → Dual relays simultaneously trigger shutdown and pressure relief, LCD displays fault code.

4. Key points of implementation

• The power and signal wiring are separated, and the shielded wire is grounded at one end to resist electromagnetic interference.

• Backup parameters to a USB drive to avoid program loss; Regularly calibrate sensors (once every quarter).

5. Application EffectivenessRealize 24-hour unmanned operation, reduce the safety accident rate to 0, and meet GMP compliance requirements.

Case 4: Environmental Protection Industry - Sewage Tank Level and Dissolved Oxygen (DO) Linkage Aeration

1. Application scenariosBiochemical tank of municipal sewage treatment plant, monitoring DO (2-4 mg/L) and tank liquid level, linking aeration fan, optimizing microbial activity and energy consumption.

2. Solution Configuration

• Controller: 202568/20-888-888-000.

• Sensors: JUMO dissolved oxygen electrode (4-20 mA), input type liquid level transmitter (4-20 mA).

• Executors: Aeration fan (relay 1), reflux pump (relay 2).

3. control logic

• DO<2 mg/L → Relay 1 starts aeration; >4 mg/L → Stop; Liquid level<1.5 m → Relay 2 stops the reflux pump (dry operation protection).

• The panel switches to display DO, liquid level, and fan status, and alarm records are automatically stored.

4. Key points of implementation

• Select 4-20 mA input configuration, DO range 0-10 mg/L, liquid level 0-5 m.

• The relay action mode is set to "non self-locking" and will automatically reset after troubleshooting.

5. Application Effectiveness25% reduction in aeration energy consumption, stable compliance of effluent DO, and 50% improvement in operation and maintenance efficiency.

4、 Selection and expansion suggestions

1. Key selection points

• When there is no Modbus requirement, the suffix 000 has a higher cost-effectiveness; Remote monitoring is required and can be upgraded with Modbus models (such as suffix 888).

• When the load power is ≤ 5 A, directly drive the contactor/solenoid valve; Excessive power requires the addition of an intermediate relay.

2. Expansion plan

• Multi parameter monitoring: Connect 2 sensors through a signal distributor to switch between display and control.

• Data recording: Equipped with JUMO data logger to store alarm and trend data, meeting traceability requirements.

JUMO Controller 202568/20-888-888-000