PH Controller Dosing Pump

The setting of Hi and Low Level of pH Value to operate Dosing Pump: PH Controller Dosing Pump
Lower Level Dosing Pump / Alarm Setting: Press REED button lower side rotate screw provided on the right side to set lower-level alarm/relay output if pH Value of solution goes down to this value relay 1 will turn ON and provide its potential-free contact as output.
Higher Level Dosing Pump / Alarm Setting: Press REED button upper side rotate screw provided on the right side to set Higher level alarm/relay output if pH Value of solution goes higher to this value relay 2 will turn ON and provide its potential-free contact as output.

The pH scale is in the range of 1 to 14. When there is a change of pH by unit 1 (for ex. pH changes from 4 to 5), it indicates the change in hydrogen ion concentration by 10 times. When there is a change of pH by 2 units it indicates that the change in hydrogen ion concentration by 100 times. Due to this relationship, the pH scale is called logarithmic.
SET High limit and Low limit of pH Value for Buzzer / Relay Operation

PH Controller Dosing Pump

a) Press the SET button Upper display show HPH the higher limit to set
and lower display shows the value of HPH already set
Press UP and DN buttons to set Higher Limit
b) Press the SET button once again Upper display shows LPH the lower limit to set
and lower display shows the value of LPH already set
Press UP and DN buttons to set Lower Limit
c) Press the SET button again to Set Delay Time DELY in Minutes. It works if pH Value
goes more than HPH or less Than LPH value than Dosing will Start after this delay
for a set value of Quantity in ML, after dosing it will further wait for monitoring pH Value
before next dosing.PH Controller Dosing Pump
d) press SET button once again to set Dosing Quantity in ML
if pH Value goes higher from HPH or lowers from LPH then concerned dosing pump will
dose this set ML quantity in solution and wait for DELY time and Monitor the pH Value
of Solution if pH value not found within Set Limits ie. Between HPH and LPH limits
then after waiting time above process will repeat again and again till pH value stables
e) Press SET Button again or ENT button to save the changes
else change will remove after power OFF

PH Controller Dosing Pump

While we calibrate the pH meter or pH Controller. Hence we have to follow the following steps carefully.
1. Wash the Probe in Distilled water and then Dip in a Buffer solution of 7 pH
wait till the pH value is Stable, Press the UP button, wait to calibrate
2. Wash the probe in distilled water and then Dip in a Buffer solution of 4 pH
wait till the pH value is stable, Press the DN button, wait to calibrate

Auto CALIBRATION OF 4pH AND 7 pH

While you want to calibrate the pH Controller as per factory setting. Hence Just Push SET and ENT buttons at once calibration will set to factory set value

pH Value Scale for pH meter.

While we test many experiments, it is important to check the pH of any given chemical solution. while the pH is checked by pH or litmus paper. The change in litmus paper color indicates the change in pH, it is called a visual method. For precise noting of pH, an instrument is used and it is called a pH meter. The pH meter works on the potentio-metric principle.

Working Principle of pH meter: PH Controller Dosing Pump

The working of the pH meter is based on the Nernst equation. Nernst equation derives the relation between the electric voltage with ion concentration. The Nernst equation derived for H+ ion concentration is the basis of the pH meter. The working principle of the pH meter is potentiometry. The pH meter consists of glass (also called an indicator electrode) and a reference electrode. The glass electrode consists of a glass membrane, which is sensitive to the hydrogen ion concentration of the test sample solution. And the glass electrode potential varies from sample to sample. The reference electrode is standard and has constant potential. The reference electrode does not respond to the test sample solution. The pH meter measures and compares the potential difference between both glass and reference electrodes.

design and Construction of pH meter Probe

1. Glass bulb: It is a sensor that senses the H+ ion concentration and it is made from a special type of glass and membrane. The glass bulb consists of 0.1M HCL Solution.
2. Internal electrode: this electrode is made of silver chloride.

PH Meter

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