PROCEDURE FOR CLEANING, OPERATION AND CALIBRATION OF TACHOMETER
PURPOSE: To lay down a procedure for Cleaning, Operation, and Calibration of the Tachometer.
SCOPE: This procedure is applicable for the Cleaning, Operation, and Calibration of Tachometer screw in the Quality assurance Department.
REFERENCE: In-House
DEFINITION
TACHOMETER: A tachometer is an instrument that is used to measure the speed of an object or substance, it is also called a revolution counter.
RESPONSIBILITY
QA Department Person: To use the instrument as per the defined procedure
OTHER RESOURCES: HANDLING OF JEWELLERY AND ORNAMENT IN THE PLANT
PROCEDURE
SAFETY/PRECAUTION/EHS: Always use calibrated instruments.
- Cleaning Procedure
- Clean the Tachometer before & after each use.
- Clean the Tachometer with the help of a dry, clean, lint-free cloth.
2. Operating Procedure
- Place a small piece of reflective tape (included) on the shaft or moving element (disc, pulley, etc.) whose speed is to be measured. If the element’s surface is highly reflective it may need to be painted a darker color to ensure reliable results. If the distance to the object is less than 5″ (127 mm), reflective tabs (optional) should be used instead of reflective tape.
- Aim the tachometer at the reflective tape from a distance of 2 to 10 inches.
- Depress the measure button for 1-2 seconds to observe the display as it changes according to the speed of the shaft or rotating element (as soon as the laser hits the reflective tape, the unit will start to indicate the speed). If the beam is “on target” the unit RPM will flash at the top of the display. If RPM is not flashing then the beam is “off target” (adjust aim).
- After the observation is completed, retain the reading by releasing the power switch before removing the tachometer from its position. The last reading is displayed for a period of 5 minutes and can be extended any number of additional 5-minute increments by pressing the memory switch.
Calibration Frequency
- Calibration shall be performed by an outside party.
- Calibration Frequency: Yearly (± 30 days )
Precautions
- The non-reflective area must always be greater than the reflective area.
- The shaft surface must be clean and smooth before applying the reflective tape.
- If measuring the very low RPM values, for that purpose attach more “Reflective marks” averagely. Then divide the reading shown by the number of “Reflective marks” to get the real RPM.
- Always remove the batteries after use.
Replacement of battery :
- When the left corner of the LCD shows “”, it is necessary to replace the battery However, in –—spec measurements may still be made for several hours after the low battery indicator appears before the instrument becomes inaccurate.
- Slide the battery cover away from the instrument and remove the battery. Replace with a 9V battery and reinstate the cover. Make sure the battery cover is secured change the battery
MORE: CLEANING, OPERATION AND CALIBRATION PROCEDURE OF FRIABILITY TEST APPARATUS
