Standard Operating Procedure For Reading  & Dry Bulb Hygrometer

by Pharmadocx Consultants

RESPONSIBILITY:  Production Manager


INSTALLATION:-    The instrument is composed of two thermometers. Hang it vertically in a place

                                    where there is steady flow of air.

OPERATION:-          Fill the cistern with distilled water. Change the water frequently. The wick is

                                    changed regularly to ensure a constant flow of moisture to wet bulb.


  1. Not down temp. of dry bulb & wet bulb thermometer.
  • Calculate the difference of temperature between them. It is termed as depression value of wet


  • In the table locate reading of the dry bulb against depression value calculated at step No. 2 &

      at the intersection of the 2 columns read the % age relative humidity. For example if temp. of

      dry bulb thermometer is 300 C & temp. of wet bulb thermometer is 250 C. Depression value

of wet bulb is 300 C -250 C = 50 C. Now at the intersection of dry bulb temp. 300 C &

depression  value of wet bulb % age relative humidity is located. It is 65%.


Author: (GM Production)Checked by: (QC Manager)Authorised by: (Director Technical)
Date:Date :Date :

  (Review date on or before 12 months from date of authorization)

Written by Anmol Singh

Anmol Singh Completed his Bachelors in Field of Mechanical and Automation Engineering. He has over 2 Years of experience in field of Pharmaceuticals, Medical Devices, Cosmetics Manufacturing.

13 June 2023

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