Industrial pH probes used for an intermittent batch process with slurry media face performance issues due to sensor drying, sensor clogging and slow response speed. A self cleaning pH sensor assembly is described in this technology.

1. Low cost compared to other imported self cleaning sensors.
2. Minimum maintenance as clogging and /or drying of the sensor is avoided.
3. Longer, maintenance free sensor life.
4. Downtime of the system due to removal and cleaning of the sensor is reduced.

1. Pharmaceutical: pH measurement of slurries in reactor vessel.
2. Waste management: pH measurement of dirty, sludge waste streams.
3. Chemical Industry: Measurement and monitoring pH values of intermittent chemical batch processes.

Industrial pH probes are rugged but face performance issue due to sensor drying, sensor clogging, slow response speed especially in intermittent chemical batch processes with slurry media. Cleaning and maintenance requires a considerable man-hour and thereby expensive downtime of the process. The self cleaning pH sensor assembly is low cost, requires minimum maintenance and saves replacement of costly sensor due to its inherent design facilitating longer, maintenance free sensor life. The pH sensor housed in the designed assembly not only protects the sensor from drying, clogging but also helps is faster dynamic pH measurement in slurry processes.

1. Pharmaceutical: pH measurement of slurries in reactor vessel.
2. Waste management: pH measurement of dirty, sludge waste streams.
3. Chemical Industry: Measurement and monitoring pH values of intermittent chemical batch processes

SPECIFICATIONS OF THE SYSTEM

Sr. No.	Specification	Value
1	Measurement range	0-14pH as specified by the Sensor
2	Accuracy	+/- 0.05pH as specified by sensor
3	Sensor Body MOC	Ryton, Teflon
4	MOC of wetted parts	SS304L
5	MOC of non wetted parts	PU, GI, SS
6	Supply Voltage	230VAC, 50Hz
7	Power Consumption	Max 2W
8	Output	4-20mA, 0-10V
9	Alarm	2 points
10	Valve type	Direct Acting Solenoid
11	Utility Requirement	Compressed Air @5kg/cm2 Water supply with minimum 6m head.
12	Installation	Vertical Installation. Minimum 3” Flange recommended
13	Suitable for	Chemical Batch Process Liquid Slurry etc

RAW MATERIALS

1. High quality Industrial pH sensors are mostly foreign make and needs to be imported through local distributors.
2. pH indicators and other electrical and panel accessories are locally available.
3. Stainless steel or user specified pipe, tubes, fittings are also available in local market.
4. Solenoid valves and accessories are locally produced and available at local market.

INFRASTRUCTURE

1. Mechanical workshop for fabrication of sensor assembly along with Medium Precision Lathe Machine, Min 15”drill machine, Welding setup.
2. pH Sensor Calibration and testing facility which includes a Laboratory Grade pH Sensor, pH buffer preparators.
3. Compressed air for testing.
4. Electronic measurement equipment- Precision milivoltmeter, Process calibrator for onsite commissioning.

SPACE

1. Space of 40 m² required for start the manufacturing of the unit.

MANPOWER

1. An experienced Instrumentation Engineer/Diploma holder.
2. An Electronic/Electrical technician for assembly of electronic components and panel.
3. A mechanical diploma Engineer/Technician for fabrication, assembly of the Sensor unit.
4. One technician each for operating Lathe, Drill and Welding Machines