Overview

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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

 

Intercomparison:

100 MPa Hydraulic Pressure - APMP DEC Pressure Comparison Project

 

 

 

Staff:

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• Maryness I. Salazar – Section Head
• Sarah Jane Talan
• Radly F. Manalo
• Ahdrian Camilo C. Gernale

Traceability

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Capability

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

Pressure

• Pressure Calibrator / Module
• Digital Pressure Gauge
• Test Gauge
• Pressure Transmitter  / Transducer
• Industrial Pressure Gauge
• Industrial Pressure Balance / Deadweight Tester
• Sphygmomanometer

Force

• 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

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Direct Comparison

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

Example:

• 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.

Scope of Accreditation

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