SOP for Digital Thermohygrometer

This Document describes (Standard Operating procedure) Sop for Operation and calibration of digital Thermohygrometer

Sop for Operation and calibration of digital Thermohygrometer

I. Purpose & Scope:

• To provide the procedure for monitoring of Temperature by Digital thermohygrometer in Quality Control Department.
• This procedure is applicable to all Quality Control Department for monitoring of temperature by Digital thermohygrometer

II. Responsibilities:

• All Quality Control and Quality Assurance personnel’s shall be responsible to follow and implement this SOP.

III : Introduction and Procedural Part :

Health, Safety and Environment: 

• Check that the instrument and surroundings are clean, if not, clean with lint free cloth.
• Check and ensure that the equipment is kept upright on its stand or fixed on wall and display is legible.
• Install the battery with correct polarity positioning.
• Place the unit away from direct sunlight rain or extreme heat.
• Peel off display Protective sheet.
• Ensure that Hygro-Thermometer is calibrated.
• Ensure that hygrometer sensor holder to desired place in the area.
• The unit will perform self-test and display reading normally after 5 seconds.

Preliminary Check for Digital thermohygrometer :

• Check and ensure that the equipment is clean and suitable for starting the operation. If it is not, clean with a lint free cloth.
• Immediately intimate to maintenance department through Job Order if the environmental conditions is out of limit.

Basic Operation of digital Thermohygrometers : 

Setting of Time, Clock alarm, 12 / 24 hours time format :

• Time setting is carried out by pressing “MODE” button for 2 second.
• After beep, release the “ADJ “ key, this shall appear  flashing of minutes.
• Press “ADJ” to adjust the time value.
• Press Mode once to set hour time. Press “ADJ” to adjust the hour parameters.
• Press “MODE” twice to set 12/ 24 hours time format
• Press “MODE” again to set Month & Date to set the parameters and after setting it shall directed to hh: mm.
• Press “MODE” and press “ADJ” twice to appear alarm on hh:mm format. Press “ MODE” key for 2 seconds to reset the hh:mm for alarm activation.
• MODE switch the clock and alarm display mode/ set the current clock alarm clock 12 or 24 hr clock date.
• ADJ adjust the value is set to the project.
• MEMORY display memory in the highest & lowest temperature and humidity value/clear memory of the minimum and maximum temperature and humidity values.
• For deactivation of alarm, press mode and adjust key till it removes alarm indication.

Minimum / Maximum reading memory:

• Press (MAX/MIN) button to display maximum measured value, press the button once more to display minimum measured value, press the button again to return to normal display.
• Press and hold (MAX / MIN) button until two bars “ – -” are displayed then release to reset memory.
• Daily Reset Slide (DAILY RESET) switch to “ON” position to reset maximum / minimum memory automatically at actual value of temperature
• Set the 0 C / 0 F Exchange by pressing (0 C / 0 F) button to change temperature unit.
• Record the temperature at first half & second half of the day in respective areas of QC lab.

Maintenance :

• Battery Replacement:  Replace the batteries when signal of low battery appears in the display or whenever required.

Calibration of digital thermohygrometer :

• Calibration Frequency: Yearly
• Calibrate the equipment from the outside party once in a year.
• Note: If equipment does not comply with any of the calibration Parameters then follow the relevant procedure of equipment Breakdown.

IV: Annexure:

Annexure I      : Room temperature record.

Annexure- II   :  List of thermohygrometer with temperature

Annexure-I 

Room Temperature Record 

Annexure-II

List of thermohygrometer with Temperature