Calibration of flow meter

 

Calibration  of flow meter

All flow meters require an initial calibration.

 Manufacturers of the flow meter usually calibrate a  flow meter for specific service conditions. 

The need to recalibrate usually depends on how well the meter fits the application. Some liquids passing through flow meters are corrosive or acidic or abrasive. So after sometime portions of the meter will deteriorate and the performance of the meter is reduced

 

The procedure of flow meter calibration

 First flushing the transmitter.

 Flush both the impulse lines. 

Adjust the zero when there is no flow or by equalizing in case of od DP transmitter if necessary. 

Close one of the valves either H.P. or L.P. open the equalizing valve. The O/P should read zero.

For span, calibration passes a flow of known value preferably span value of flow meter, and calibrates the span.

again check zero.

Common faults in flow meter

* No power

* Impulse line leak or block

* any wear ina components

* Transmitter faulty

* mA cable faulty

* calibration not ok

* analog channel faulty


Top 50 instrumentation interview questions


Radar level transmitter


Ultrasonic Level Transmitter


Capacitive level sensor


Calibration of flow meter


Thermocouple


Infrared gas analyzer


level measurement


Pressure measurement 


Vibration measurement


Solenoid Operated Valve


Flow measurement


Gas analyzer


Belt Weigh Feerder


Temperature measurement


Load cell

Comments

Post a Comment

Popular posts from this blog

Load cell basics

Image
  Load cell What is a load cell Its usually asked in a way that what is meant by a load cell, answer is quite simple, Load cell is an instrument used to measure force. This force may act on a load cell in any form like tension or compression. The load cell is a transducer that converts force applied to it into an electrical signal usually millivolts. So by using electronics circuitry, we convert this electrical signal of millivolts can be shown on display converted into load in kg or tonn, and further this can be transmitted into a standard signal of 4 to 20 mA or 0 -5 v. Load cell working principle what s the working principle of a load cell ?? As discussed above load cell converts force into an electrical signal, most of the time load cell is designed by using a strain gauge, when the force applied to strain gauge its resistance changes, and using it in a wheat stone bridge we convert this change in resistance to measure force, however pneumatic and hydraulic type load cell is also u
Read more

Level measurement

Image
Level measurement What is Level The level is a measure of the difference in altitude of two points. The height of the water column, liquid, or powder in the desired range between the minimum and maximum values is called their level. There are different measurement methods implied for the level measurement.   Units of level Meter Foot Percent Types of level measurement There are two main methods to measure level. 1. Direct or visual method  2. Indirect method Direct Methods (Visual Methods) The direct method is used to measure the height of a substance above a point marked as zero points. Direct methods for level measurement are preferably used when level changes are slow and small, for example,  to measure the level of Sump tanks and Bulk storage tanks. Direct level measurement methods are simple and are considered very reliable.  Types of direct methods Direct level measurement devices are divided into four types: a. Dip-sticks & Dip-Rods b. Weighted gauge tape c. Sight Gauges  d
Read more

Temperature measurement

Image
 Temperature  Measurement.   What is Temperature? Temperature is defined as the degree of hotness or coldness measured on a definite scale. Hotness and coldness are the results of molecular activity.  If the movement of the molecules is fast it indicates that temperature is higher, if the movement of molecules is slow its mean temperature is low. Absolute zero temperature Absolute zero is the temperature at which the movement of molecules completely stops. Definition of Heat? Heat is a form of energy and heat is measured in calories.  Importance of temperature measurement  Temperature measurement is very important in daily life as well as in industrial processes. In daily life ambient temperature is measured in routine, as well as a body temperature of a person is directly related to health. In the industrial system, most processes depend upon temperature, if no proper temperature process disturb and product quality affected. Temperature is also measured from the safety point of vie
Read more