The Pressure and Force Standards Section (PFSS) maintains national and reference standards for pressure, force, torque and hardness.

The PFSS is competent under the terms of ISO/IEC 17O25 to carry out calibration of pressure standards and plans to extend the accreditation to all the other quantities in the lab. Continuous development on capabilities is also envisioned as to provide for the country’s metrological needs.

Capability of the Lab:


Scope of Operations


Parameter Range Calibration and Measurement Capabilities Calibration Method
Gauge Pressure Measurement 1 MPa-50 MPa 1.1x10-4xPe, but not smaller than 0.053 kPa Comparison with Standard Hydraulic Pressure Balance
>50 MPa –100 MPa 8.9x10-5xPe, but not smaller than 0.89 kPa.
>100 MPa – 500 MPa 2.8 x 10-4 x Pe, but not smaller than 14 kPa
0.02 MPa – 20 MPa   Comparison with Standard Pneumatic Pressure Balance



Scope of Operation (DAkkS Accredited)


measurand / calibration items measuring range standards and procedures uncertainty of measurement remarks
Gauge pressure pe 0.2 MPa>4 MPa toto 4 MPa20 MPa DKD-R 6-1EURAMET/cg-17/v.01 7.1×10-5×pebut not less than 25 Pa7.1×10-5×pe Pressure medium: Gas.
Gauge pressure pe 1.25 MPa>6.8 MPa toto 6.8 MPa100 MPa DKD-R 6-1EURAMET/cg-17/v.01 1×10-4×pebut not less than 410 Pa8.3×10-5×pe but not less than 630 Pa Pressure medium: Oil.


Hydraulic Pressure:


Lowest-highest achievable pressure: 0.1 MPa – 500 MPa (gauge pressure)

Scope of Accreditation: 1.25 MPa to 100 MPa


Pneumatic Pressure:


Lowest-highest achievable pressure: 0.02 MPa – 20 MPa (gauge and differential pressure)

Scope of Accreditation: 0.2 MPa to 20 MPa



Industrial Pressure Calibration through direct comparison with a Pressure Calibrator


Hydraulic: 0 – 1000 bar

Pneumatic: -1 to 20 bar



100 MPa Hydraulic Pressure - APMP DEC Pressure Comparison Project





  • Maryness I. SalazarSection Head
  • Sarah Jane Talan
  • Radly F. Manalo
  • Ahdrian Camilo C. Gernale





Pressure and Force Standards Section conducts calibration/testing of the following Instruments:


  • Pressure Calibrator / Module
  • Digital Pressure Gauge
  • Test Gauge
  • Pressure Transmitter  / Transducer
  • Industrial Pressure Gauge
  • Industrial Pressure Balance / Deadweight Tester
  • Sphygmomanometer
  • Testing Machines such as universal testing machine, tensile testing machine, compression testing machine, etc.
  • force gauge
  • dynamometer
  • push-pull scale
  • axle weighing system (static mode only);
  • Durometer (Type A & B only)
  • torque meter
  • torque wrenches
  • spring torque testers
  • torque drivers

Calibration Method

Direct Comparison

Pressure reading of the Unit Under Calibration (UUC) is compared to the pressure generated by the standard.

  • Industrial gauge compared to a test gauge.
  • Test Gauge compared to a pressure calibrator.
  • Pressure calibrator compared to a pressure balance (hydraulic and pneumatic)


Calibration of an Industrial gauge through direct comparison to a test gauge


Calibration of a Test Gauge through Direct Comparison to a Pressure Calibrator

Calibration of a Pressure Module / Calibrator through Direct Comparison to a Hydraulic Pressure Balance

Calibration of a Pressure Calibrator through Direct Comparison to a Pneumatic Pressure Balance

On-site Calibration of Pressure Gauges / Transmitter

Calibration of Deadweight Tester by Cross-floating method using

Method A of EURAMET Calibration Guide EM/cg/03.01/p

Calibration Procedure:

The Unit Under Calibration (UUC) is connected to a pressure standard that is used to apply known gauge pressures. Measurement series of increasing and decreasing pressures will be applied depending on the accuracy of the UUC, using the appropriate pressure medium such as air, water, nitrogen gas or hydraulic oil.

Trainings offered:

The PFSS offers in-house and on-site training on the “Introduction to Pressure Metrology and Calibration of Pressure Gauges

Pressure Training at Metrology Training Center

On-site Pressure Training


The Pressure Standards Section of the National Metrology Laboratory of the Philippines is competent under the terms of ISO/IEC 17O25:2OO5 to carry out calibration of Pressure standards.

ilac mra dakks

Scope of Accreditation

Pressure Standards Scope

 Download 2012_DAKKS_accreditation_certificateAnnex to Accreditation Certificate 01, and Annex to Accreditation Certificate 02