Laboratory equipment calibration services of the Soil Mechanics and Technical Laboratory

Introduction

 February of 2018 with the use of expert and experienced experts, modern devices and obtaining an official license from the National Standards Organization and the National Certification Center of Iran. The main purpose of establishing the calibration laboratory as one of the fully specialized departments of the Soil Mechanics and Technical Laboratory Company is to respond to the needs of internal and external customers in the field of laboratory equipment calibration services and quality control of related projects in the field of the Ministry of Roads and Urban Development. This laboratory provides calibration services in various quantities including force, temperature, mass, volume, dimensions, pressure, loading and chemical parameters. Equipment calibration is done in the soil mechanics and technical laboratory according to regional, national or international standards.

Calibration services

In the national standard of Iran, in the "basic and general terms of metrology" section, calibration is defined as follows:

Comparing the instrument with a laboratory standard reference in standard conditions, in order to ensure its accuracy and health, and to determine the error rate of this device compared to that standard and to adjust it compared to the standard.

Force

• Calibration of tensile load cells (Up to 7.5 tf)
• Calibration of compressive load cells (Up to 300 tf)
• Calibration of testing machines (compression and tension)
• Speed calibration (verification) of material testing machines
• Calibration of displacement measuring components of material testing machines
• Measurement of the rotation speed of rotating objects (rotary oven, mixer, centrifuge, electric stirrer, Los Angeles, etc.)

Mass

• Calibration of weights
• Calibration of scales (Up to 50 kg)
• Calibration of bascules (Up to 2000 kg)

Volume

• Calibration of flasks (Up to 5 L)
• Calibration of burettes (Up to 200 mL)
• Calibration of pipettes (Up to 200 mL)
• Calibration of pycnometer (Up to 100 mL)
• Calibration of graduated cylinder (Up to 5 L)
• Calibration of volumetric instrument (Up to 20 L)
• Calibration of digital piston-operated instrument (dispensers and burettes up to 100 mL)

Temperature

• Calibration of thermocouples (Up to 1100 ⁰C)
• Calibration of resistance thermometers  (-40 ⁰C to 300 ⁰C)
• Calibration of liquid thermometers in glass, bimetallic and filled systems (-40 ⁰C to 300 ⁰C)
• Calibration of temperature environments (oven, incubator, refrigerator, freezer, furnace, water bath, etc. in the range of -40 ⁰C to 1100 ⁰C)

Pressure

• Calibration of pressure gauges "pneumatic" with elastic components  (Up to  20 bar)
• Calibration of pressure gauges "hydraulic" with elastic components (Up to 700 bar)
• Calibration of the vacuum gauge (-0.8 bar to 0 bar)

Dimension

• Caliper calibration
• Micrometer calibration
• Calibration of the dial gauge indicator by the ULM device
• Measurement of the dimensions of all types of equipment (meter, ruler, gunia, sieve, etc.) with the accuracy of one micrometer using the VMS device

Chemical quantities

• Hydrometer calibration (0.60 to 1.86 g/cm3)
• Conductivity meter calibration (Up to 20000 microsiemens/cm)
• pH meter calibration (-400 mv to 400 mv)

Loadring

• Determining the coefficient and loading capacity

TSML Calibration lab;

The only owner of 3000 kN Class 00 compressive load cell (GTM) in the country

The Calibration Lab of the Soil Technical and Mechanical Lab company is able to calibrate tensile force machines with a capacity of 750 kN and compressive force machines with a capacity of 3000 kN with the help of its set of load cells. By equipping its collection with a 3000kN class 00 pressure load cell, this laboratory has the capability of calibrating a set of compressive load cells with a lower class (class 0.5, class 1 and class 2). It is worth mentioning that this load cell is the only 3000 kN class 00 load cell with the German GTM brand available in the country and it is minimal in terms of error and uncertainty compared to other load cells. It is used as the main reference for calibrating load cells with class It is used lower in the country.

The above load cell has a valid calibration certificate, which enables the establishment of traceability to international standards. The design of this load cell is such that the results are the same regardless of environmental conditions and in different places, and according to the table, it benefits from an acceptable reproducibility (0.045 %). Other features of this load cell include high accuracy (according to the table) and low weight. Also, this load cell has high resistance and stability. In other words, its uncertainty changes against the force and torque applied during use are very small; According to the load cell creep error table, it is 0.01 %.