Figure 1. Hydropanel HP-4131: 1 - pH-meter; 2 - the panel; 3 - cell; 4 - electrode; 5 - flowmeter; 6 - filter; 7 - adjusting valve.
Figure 2. Hydropanel HP-4122.1 (without calibration): 1 - pH-meter; 2 - the panel; 3 - cell; 4 - electrode; 5 - flowmeter; 6 - filter; 7 - adjusting valve
Figure 2. Hydropanel HP-4122.2 for pH meter with manual calibration without unmounting: 1 - pH meter; 2 - the panel; 3 - cell, 4 - electrode; 5 - flowmeter; 6 - capacity for buffer solutions; 7 - adjusting valve
Figure 3. Hydropanel HP-4122.3 for PH meter with automatic calibration without unmounting: 1 - pH meter; 2 - the panel; 3 - cell, 4 - electrode; 5 - flowmeter; 6 - capacity for buffer solutions; 7 - adjusting valve; 8 - the solenoid valve; 9 - the pump