SOP for Operation and cleaning of vernier Caliper.

This Document describes (Standard Operating procedure) SOP for Operation and cleaning of vernier Caliper.

SOP for Operation and cleaning of vernier Caliper.

I. Purpose & Scope:

• The purpose of this SOP for Operation and cleaning of vernier Caliper..
• This Standard operating procedure shall be applicable for Operation and cleaning of vernier Caliper.

II. Responsibilities:

• All Production, Quality control and Quality Assurance personnel shall be responsible to follow and implement this SOP.

III : Introduction and Procedural Part:

Procedure for Operation and cleaning of vernier Caliper :

Precaution:

• Ensure that the Instrument is properly clean.
• Check the calibration status.
• The outside and inside measuring jaws of the instrument have a sharp edge. Handle with great care to protect from damage.
• Do not mark the caliper with an electric engraving pen.
• Do not scratch the scale.
• When the LCD display “B” indicates the battery voltage is low, immediately replace the battery.
• Use a SR 44 battery (Silver oxide cell) only.
• Keep the instrument in the box after use.

Setting of Instrument:

• Press the jaws of Vernier caliper against each other by rotating the screw of sliding scale provided near the LCD Display.
• Switch ON the instrument by pressing green “ON/OFF” button provided at the left hand side of LCD display.
• After turning on the power, close the jaws and hold down the “ORIGIN” switch for more than 1 second. The “0.00” display appears indicating origin (zero point) setting is complete. (Set zero of the caliper with the “ORIGIN” switch if the battery is changed. Thereafter no more zero setting is required for the entire battery life.)
• Press white button to select the measure unit in “Inch “ or “mm“
• When the instrument is in ‘mm’ mode the display shows “0.00” mm and when it is in inch mode the display shows “0.0000”

Comparison Measurement:

• Perform the comparison measurement (INC mode), by adjusting the jaws to a given extent where the caliper is to be zero set, then press the “ZERO ABS” switch for less than one second.
• The caliper will zero set with “INC” indicator on the LCD, being ready for comparison measurement.

Absolute Measurement:

• Perform absolute measurement (ABS mode) as follows.
• The caliper always enters the ABS mode when the power is turned ON, displaying dimensions from zero point.
• Unless “INC” is displayed on the LCD, reading displayed on the scale are in absolute range.
• If “INC” appears on the upper left of the LCD, hold down the “ZERO/ ABS” switch for more than two seconds. “INC” will disappear and the caliper will be ready for measurement with respect to absolute origin.
• Use upper jaws to measure ID (Inner diameter) and lower jaws to measure OD (Outer diameter).
• Loosen the sliding scale by rotating screw anti-clockwise direction.

Cleaning:

Clean the Instrument with a clean dry cloth every day.

 Operation:

• Press the jaws of vernier caliper tightly against each other by rotating the screw of sliding scale in clockwise direction.
• Press the green “ON/OFF” button to put ‘ON’ the LCD screen.
• Press a “ZERO/ABS” key the LCD screen shows zero reading for “mm and inch.”
• Hold the sample in between the two jaws. (Do not apply pressure).
• Select the mode of measurement, i.e. Comparison or Absolute as described of instrument setting.
• Record the measurement in ‘mm ‘or ‘Inch ‘as per requirement by selecting respective scale.
• After measurement remove the test sample from the jaws and bring to original position by screwing in clock-wise direction.
• Press “ON/OFF” button to put off the LCD.
• Clean the instrument with the help of soft tissue paper and keep in the box.

Storage : 

• Keep the instrument in the box after operation and cleaning of vernier caliper