Answer / carl_ellis

A Thermal Instrument was flow calibrated at the factory for a certain specified medium/fluid. If their flow meters can be recalibrated in the field for fluids other than the one specified at time of manufacture, the calibration instructions are not posted on the web site.

Their web site does have a fairly long and involved calibration check for landfill gas application (methane generated in garbage dumps/landfills) under the FAQ: What is your procedure on checking the calibration of a landfill gas meter in the field? It involves on-site multiple pitot flow measurements in a traversing pattern to get a flow average, calculating m molecular weight of the gas mixture, calculating density from the ideal gas law, and then converting to velocity and finally calculating mass flow with the tube's cross sectional area. Simple, huh?

The analog output of the transmitter, the zero at 4.00mA and the span at 20.00mA, can be adjusted with a field calibration check and adjusted as necessary.

Typically, the flow rate can only be calibrated on a certified flow stand or flow cell; field calibration is not practical. Return to the factory is typical.



Carl Ellis Measure First

In E&I diagram what is the meaning of rectangular box and circular box

3 Answers   L&T,

---

Senior engineer's please help me, what is Loop Checking and Loop test? and write difference also? soon urgent

0 Answers   Kentz,

---

Define cryogenic?

0 Answers  

---

d/p flow transmitter LP side give to pressure.what you geting out put ? how you get(ma)?

6 Answers   ABB,

---

what is a mapping in plc & dcs

1 Answers   Arctern, ARM Cement,

---

Basics Instrumentation Question

1 Answers   Advantek Fuel Systems,

---

what is control valve input and out put

10 Answers   Nirma,

---

How much flow is passing through 6 inch line? There are no gauge, no any transmitters in line.

3 Answers  

---

Derive capacitance to 4-20ma conversion formula / relation in capacitance type pressure sensor?

0 Answers   ISRO,

---

how magentic flow tx. vortex flow tx & ultrasonic flow tx works and its prinicle?its callibtration prosedure?

1 Answers  

---

Ple give me "INDUSTRIAL INSTRUMENTATION AND CONTROL S.k. Singh 3th edition" Solution manual to self-Check Quiz and chapter-wise PowerPoint Slides. Home web-site not available... Ple Ple Ple Ple Ple Ple Ple Ple Ple Ple Ple Ple Ple Ple Ple Thanks for all...

0 Answers  

---

Please explain the difference between instrument range and calibration range in terms of pressure transmitter? line design pressure: 93 bar operating pressure : 82 bar press Transmitter Range? calibration range ?

3 Answers   L&T,

---