Interested to Buy Any Domain ? << Click Here >> for more details...
How a pH sensor & analyzer work at waste water treatment
plant, whats the principle & science is beyond this,How pH
sensor sence & convert signal & move toward analyzer &
analyzer show reading in percent? also what is temperature
compensate option in analyzer
- 1 Answers
- 9263 Views
- I also Faced
- E-Mail Answers
Answer Posted / rajesh
pH is a measure of the acidity or basicity of a solution. pH
is a potentiometric measurement where the electrode used
produces an electrical signal which the pH meter converts to
a pH reading. The signal produced and measured is a voltage
and since voltage is a potential difference, two potentials
are needed to make a measurement:
a) The sensing electrode provides a potential proportional
to the logarithm of the hydrogen ion activity in the sample.
b) The reference electrode ideally provides a stable and
consistent potential independent of the activity of the sample.
The potential difference between the reference and sensing
electrode is measured by the meter and converted into a pH
value.
All pH sensors consist of a measuring glass electrode and
reference electrode. A combination electrode is an electrode
which contains both the reference and measuring electrode in
the one body. The reference electrode provides a constant
potential regardless of the composition of the solution it
is placed in. The voltage difference between the reference
and measuring electrodes is a function of the pH value of a
solution.
Calibration is done using pH Buffers. Most modern pH meters
are supplied with the facility for automatic buffer
recognition. The manufacturer will have programmed in a pH
versus temperature profile into memory for a specific type
of buffer. If a different buffer to that specified by the
manufacturer is used for calibration this will result in
calibration errors. For proper calibration, buffer solutions
of carefully selected accuracy and pH range are required.
The calibration should be performed using two buffers whose
values bracket the expected value of the samples being
measured. In practice many pH meters are equipped with auto
buffer recognition - this requires the use of the buffer
values specified by the meter manufacturer.
| Is This Answer Correct ? | 15 Yes | 1 No |
Post New Answer View All Answers
Why rdt and thermocouple both give different output .and one things more, how to generate ohm or mili volt plz mail me merajalam143545@yahoo.com
I have completed B.E. Instrumentation & control in 2009. i have 3 year industrial job experience in chemical plant.now, I want to join M.E. in external. so, Plese say easiet way and good institute name.
1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling
What is the use of control cable?
what is the working principal of pribe
Why do we have earthing cable in branch cable and shield in the same cable?
What is the difference between PLC and DDC?
The Design Calculation of Level Transmitter For Different Structure open & Closed Vessel, Eg. Diff. Level Tx., Capacitance For Continous Operation
Explain the mechanism behind the turbine meter.
why is not useing in boiler skin thermocople
Explain the working of an electronic level troll.
give eg of how I/P is used in control loops
Describe how to use megger to measure the earth resistance and insulation resistance
Galvanizing.
Hook up resistance decade box to temp.transmitter.
