Conductivity transmitters

One of the conductivity measurements is based on the principle of an induction of a transformer. An AC voltage generator controls the primary side of the transformer. The liquid flows through the channel bore in the measuring head and forms a conductor loop (as most of the liquids are good conductor of electricity), which links the primary side of the transformer and the secondary side of the transformer.

cond

Built-in around the hole are two coils; a primary coil supplied with an AC voltage and a secondary coil, which picks up a small signal through the media inducted voltage. The size of this voltage is dependent on the conductivity of the media. This signal is handled and amplified in the electronics to a linear analogue 4…20 mA output signals.

Also built into the body is a Pt100 sensor placed in the tip of the sensor. This is measuring the media temperature to enable temperature compensation of the conductivity signal, which is very temperature dependent. The Pt100 sensor signal also features as a separate analogue 4…20 mA output signals. 

The measuring cell is a homogeneous sealed body. Through the body is a hole, through which the media is flowing as shown below

cond sen

Calibration of conductivity transmitter

  1. 1.Put the cell constant as provided in the data sheet of sensor or sticker in the probe will be of a value like 02.7 (two point seven).Also take the transmitter to manual option this overrides the temperature effects

 

 

2.Enter the value of model of transmitter (for Rosemount 1066 it will be a model number like 228-torroidal sensors)

 

 

3.Put range in the transmitter as per your requirement like 0 to 20000 micro Siemens/cm

 

 

4.Remove the sensor from the pipe

 

 

5.Select measure conductivity option

 

 

6.The go to calibration option

 

 

7.Again enter to in process calibration

 

 

8.Clean the sensor with DM water

 

 

9.Turn off automatic temperature compensation in the transmitter. This eliminates error in the cell constant

 

 

10.Place the sensor in the standard solution like 1000 micro Siemens/cm solution

 

 

11.Wait for stability

 

 

12.Enter the value 1000 in transmitter and press enter key

 

 

13.Screen will be showing calibration under progress

 

 

14.After some 5 to 6 seconds , calibration completed will be shown in the transmitter

 

 

15.Remove the sensor and place it in the line and line up the transmitter

 

 

N.B: For zero calibration (in case if the transmitter is showing a negative value), remove the sensor from line and keep it in the open atmosphere, go to zero calibration option in the transmitter and enter zero calibration; the screen will be showing calibration under progress. After 5 to 6 seconds the transmitter will be showing calibration completed. Keep the transmitter in the process line and now the transmitter will be showing the process value and also if continuous error or temperature error is showing in the screen then go to diagnostic and ensure that it is turned off

To learn more about Instrumentation and Control, purchase your copy now

from amazon

 

 

 

23 thoughts on “Conductivity transmitters

  1. Pingback: My Post till now | Kishore Karuppaswamy

  2. Pingback: All my posts till now | Kishore Karuppaswamy

  3. Pingback: A typical Foundation Field bus wiring diagram | Kishore Karuppaswamy

  4. Pingback: Flow transmitter DP type | Kishore Karuppaswamy

  5. Pingback: Instrumentation related to a motor driven pump | Kishore Karuppaswamy

  6. Pingback: Dampers | Kishore Karuppaswamy

  7. Pingback: Calibration of Temperature transmitter zero trimming | Kishore Karuppaswamy

  8. Pingback: Calibration of siemens sipart PS2 | Kishore Karuppaswamy

  9. Pingback: Painting Procedure | Kishore Karuppaswamy

  10. Pingback: Instrumentation Cable design specification | Kishore Karuppaswamy

  11. Pingback: Acceptable accuracy ranges of Instruments | Kishore Karuppaswamy

  12. Pingback: Standard Power supply requirements for Instrumentation devices | Kishore Karuppaswamy

  13. Pingback: General design requirements of Instrumentation part 2 | Kishore Karuppaswamy

  14. Pingback: General design requirements of Instrumentation part 3 | Kishore Karuppaswamy

  15. Pingback: AK ENCON ENGINEERING SERVICES | Kishore Karuppaswamy

  16. Pingback: Bastard Esterraj Stephen and MC GSN Raju | Kishore Karuppaswamy

  17. Pingback: Ultrasonic flow measurement working principle | Kishore Karuppaswamy

  18. Pingback: Boiler | Kishore Karuppaswamy

  19. Pingback: General design requirements of Instrumentation part 5 | Kishore Karuppaswamy

  20. Pingback: All my posts till now | kishore koduvayur

  21. Pingback: AS-i (Actuator sensor-Interface Protocol) | Kishore Karuppaswamy

  22. Pingback: Profibus | Kishore Karuppaswamy

  23. Pingback: Instrumentation engineering | Kishore Karuppaswamy

Leave a Reply