How to do calibration checks of vibration Probe, extension cable and vibration monitor

Calibration checks of vibration Probe, extension cable and vibration monitor

Calibration Procedure:

1. Physical check of vibration probe and extension cable for any damages, if it is please replaced with same one.

2. Check resistance of vibration probe and continuity of extension cable it should be 5 to 9Ω and 5 to 20 Ω

3. Use below equation and get reading for calibration of vibration probe.

4. Connect test equipment.

5. Adjust the spindle micrometer on the TK-3 test and calibration kit shown 0.51 mm (20 mils) (0.0254mm=1mils).

6. Insert the probe in to the TK-3 probe holder adjust the probe in the holder until the digital multimeter shows -3.00 ±0.10 VDC.

7. Adjust the micrometer to 0.20mm (8 mils) indication and the back it out again to the 0.25mm (10 mils) indication backless in the micrometer forced the o/p voltage and record it.

8. Increase the gap in 0.25 (10mils) increment by adjusting the micrometer record the voltage indication at each increment.

9. For each gap increment subtract the voltage at the high gap from the voltage at the low gap divide the result by in a system incremental scale factor of 7.87 ±0.79 v/mm (200 mv ±20 mv/mils).

10. Subtract the 0.25 mm (10 mils) voltage (-5 vdc) from the 2.28 mm (90 mils) (11 vdc) and divided by 2.03mm (80 mils). The result should ina system average scale factor (ASF) of 7.87 ±0.43 v/mm (200 mv ±11 mv/mils).

Comments

What is a Torbar? – Averaging Pitot Tubes

The Torbar is employed for flow measurement of liquids, gases, or steam in circular, square, or rectangular section ducts for large flow rates. The Torbar is an insertion type multi-port self-averaging primary sensor for flow measurement. Torbar TORBAR is a set of Pitot tubes mounted on a bar across the pipeline with no moving parts. An averaging Pitot tube is a technology, while TORBAR is a manufacturing brand name. There are several brands available in the market with VERABAR, ANNUBAR, etc. Averaging Pitot Tube Principle Purpose Averaging Pitot tube can be employed when the average velocity of the flow profile, rather than the velocity in a specific point in the cross-section is desired. Averaging Pitot Tubes Principle It measures the differential pressure between the static pressure tap and the tap of full pressure of a stream. Thus such magnitude of differential pressure is directly proportional to the square of the flow rate. Working The TORBAR is designed in such a way that ...

Ferrules and Cross Ferruling

Ferrules are identification labels provided for every wire terminations in an instrument, equipment, or electrical/instrumentation control panels. These tube-shaped sleeves can be inserted easily on each individual wire in a multi-core cable. In earlier days fixed digits/letters are used as ferrules, but now Instrumentation engineers/technicians prints out desired ferrules by using a ferrule printing machine. Typical Ferrule The numbers/ letters on the ferrules will be given as per the approved electrical hook up or loop diagrams. This helps technicians to easily identify a particular loop/wiring from a series of terminal blocks and to troubleshoot the desired terminal connection. Separate numbers on the ferrules distinguish the positive and negative polarities of wires, thus ensure the polarity protection of the instrument. Cross Ferruling As a wire is connected on its both ends, it is quite useful to use a cross reference method for wire identification. Unlike normal ferru...

Thermowell Insertion and Immersion Length

The thermowell is the industrial housing for temperature elements like RTD or thermocouple or temperature gauges. Thermowell is directly exposed to process fluid/media. Inside the thermowell, element/gauge is installed. Thermowell transfers the heat to the temperature element. Depending upon the element type, the fluid temperature can be known. So Thermowell protects the temperature element against harsh conditions and process fluid. It enables removal of the temperature element for replacement, repair, or testing without affecting the process system. Generally, thermowells are provided with all-temperature Elements like RTD or Thermocouple or temperature gauge. A few exceptions would be bearing RTD, skin type thermocouple, air duct thermometer, etc where thermowell is not applicable / required. When the thermowell assembly is inserted into the pipe, it is subjected to vibration. This vibration is caused by vortices to be generated alternately on either side of the thermowell. The...

TILI Automation

Search This Blog