Budenberg Middle East LLC

Dead Weight Testers I Master Test Gauges I Pressure Calibrators I Temperature Calibrators I Multifunction Calibrators I Electrical Test Equipment I Pressure & Temperature Gauges I Valves I Temperature Sensors I Cables I Mixers

What we offer?

These Testers are offered in six pressure ranges, when fitted with one of the five precision piston units: BGH120, BGH300, BGH700, BGH1200, BGH1400 and BGH2600, from 1 to 2600 bar (40 000 lb/in²). 

All the models have a similar-style base except for 2600 bar which has very high pressure base.

Budenberg Gauge Co. Ltd. manufactures calibration products in Irlam, Manchester (UK). Any other manufacturers claiming manufacturing Budenberg Dead-weight Testers or proposing their manufactured Testers as “Budenberg”  are not offering genuine Budenberg products. 

All Budenberg Testers are marked with Budenberg Logo as shown below. Look for Budenberg logo for genuine Budenberg Dead-Weight Testers and Master Test Gauges.

BGH Series Hydraulic Dead-weight Testers

General Specifications

These Testers are available in six pressure ranges, when fitted with one of the five precision piston units: BGH120, BGH300, BGH700, BGH1200, BGH1400 and BGH2600, from 1 to 2600 bar (40 000 lb/in²). All the models have a similar-style base.

Application

The hydraulic Dead-Weight Tester is a simple high accuracy instrument for the calibration of pressure gauges and pressure transducers. The tester is compact and all materials have been chosen to give a long trouble-free life and to maintain a clean appearance. Accuracy and ease of use are prime features of these well proven testers.

These testers are primary standards for the calibration of instrumentation on oil over a wide range of pressures. The models with dual range piston units are particularly useful as they cover a wide range without change of piston unit.

These testers are often used for calibrating transmitters, oxygen gauges (with special fluids and accessories), gauges, pressure switches, PRVs and transducers where oil is used as the medium of operation.

Construction

All working parts of the tester are mounted on a stable anodised aluminium base which has four adjustable levelling screws at the corners. The ABS cover is retained by four screws and carries an instruction plate on the raised portion. The oil reservoir has a transparent cover and can easily be filled.

Twin Area Screw Pump

When operated with valve ‘A’ open and valve ‘B’ closed the large diameter ram generates pressures up to 140 bar (2000 lb/in²) quickly. When operated with valve ‘B’ open and valve ‘A’ closed the small diameter ram builds up higher pressures easily and small adjustments are readily made.

The stainless steel pump spindle has a rolled trapezoidal thread and the thrust is taken by a needle thrust bearing to cut down effort required. The brass high pressure block in the pump contains valves ‘A’ and ‘B’ and the oil reservoir. From this block stainless steel pipes lead to the piston unit and gauge stand.

Tester Base construction

Piston Unit

The Piston unit is the heart of the dead-weight testers and the key to its performance. The effective area of each piston unit is assessed by comparison with a master unit. Budenberg’s decades of expertise in manufacturing piston cylinder units to the tightest tolerances and high accuracy pressure measurement are widely recognised by industry throughout the world.

Many of the pistons are made of tungsten carbide which is both extremely hard and water resistant. The homogeneity of tungsten carbide permits ultra-precise finishing of the piston. The deviation from the ideal geometry is < 0.0001mm.

There are different size BGH piston units ranging from 1/16 in² to 1/160 in². The advantage to the user is in being able to choose the size that fits best to his pressure range requirements.

Dual Range Piston
Dual Range Piston Cut-out
Dual Range Piston Schematic

BGH120 and BGH300 are single piston units whereas BGH700, BGH1200, BGH1400 and BGH2600 are with dual range piston units. The dual range piston units as shown above are particularly useful as they cover a wide range starting from 1 bar (10 lb/in²) with automatic changeover from low pressure to high pressure.

Dual Range Piston Working

Piston Unit illustrated with LP Piston working and edge of piston head on LP band

Piston Unit illustrated with HP Piston working and edge of piston head on HP band

Weight Set (Masses)

The weights applied to the piston are all manufactured from non-magnetic austenitic stainless steel to close tolerances.

Each weight is marked with set number, pressure and nominal area of the piston unit.

On most testers a “making-up” weight is supplied to be fitted over the piston head to attain the pressure at the start of the range. This must be changed when weights of different pressure units are to be used. The lb/in² weights don’t require “making-up” weight.

Fine Increment weights are applied to piston to give higher (fine) resolution.

Individual Masses on Main Weight set are marked with Budenberg logo.

The picture on the right is for typical Main & Fine Increment weight sets.

Typical Mass set with Fine Increments

Flexibility and interchangeability

A piston unit can be used with sets of weights made for different units of pressure to give the same standard accuracy; thus a user with a tester having bar weights can later buy a set of lb/in² weights and can then calibrate instruments in lb/in² units with the same accuracy as with the original bar weights.

The base is the same for all models of the tester whether high or low range and if the base is fitted with an additional pressure gauge connection in place of the piston unit the tester can be used to compare the instrument being calibrated with a Standard Test Gauge (this is Pressure Comparator Model BGH1200C)

Accuracy

The standard accuracy for each model is that of the pressure generated by tester at a temperature of 20°C subject to gravity of internationally agreed standard value (9.80665 m/s²). The masses of all the weights and the area of the piston unit are traceable to National Standards originating at the National Physical Laboratory.

Higher Accuracy (UKAS)

If higher accuracy is required, all testers are available with Class ‘A’ Certificates. These certificates allow user to attain a higher accuracy by providing the exact figure for the area of the piston unit supplied across its pressure range and the figures for the mass of each individual weight. Most of the accuracies are improved by a factor of 2 over standard accuracy.

All Class ‘A’ testers are supplied with UKAS Area for Piston unit and UKAS Mass for each individual weight. The Class ‘A’ accuracy software is supplied for correction of Piston unit temperature, Pressure Head, Ambient Pressure, Ambient Temperature and local gravity.

Dead-weight Tester tool roll

Tool Roll and Instructions

The tool roll contains 1/8″, ¼”, 3/8”, and ½” BSP Stainless steel connections, Spirit level, 4 feet for fitting to bench, a bag of spare seals, two spanners, pointer remover and punch, and Operator Manual with Certificate of Accuracy.

Angle connection for flush mounting gauges and dual gauge stand are supplied (if ordered separately), 1/8″, ¼”, 3/8”, and ½” NPT connections are supplied as alternatives to (or in addition to) BSP connections. Metric (M12 and M20) and other special connections are also available.

Special Applications

For Calibration of Oxygen gauges, the tester base degreased to make it suitable for calibrating oil free instruments particularly gauges used on Oxygen. An inert fluid (such as Fomblin) is used instead of mineral oil.

Optional Accessories

The testers are supplied with following accessories if ordered separately.

Base Carrying Case

Model 433 Weather Proof Hard ABS Laboratory Storage / carrying case

Weights Carrying Cases

Model 436/1/2 Weather Proof Hard ABS Laboratory Storage / carrying cases

Dual Gauge Stand Fig 27

for simultaneous testing of two gauges against Test Gauge or dead weight tester

Liquid / Liquid Interface

Model 38, up to 700 bar (10 000 lb/in²) for Calibration of non-oil gauges and transducers

Liquid/Liquid Interface

Model 25, up to 1000 bar (15 000 lb/in²) for Calibration of non-oil gauges and transducers

NPT Connector set

1/4”, 3/8”, ½”, 1/8"BSP and Metric M12, M20 Connectors are also available

Angle Connector Fig 23

It is used for Calibrating back connection / flush panel Gauges

Single Gauge Stand

for connecting Gauges under test. One number is supplied with Tester as standard.

Additional Weight sets

Testers are supplied with bar, lb/in², kg/cm², kpa, Mpa etc if ordered separately

Power Rotation Unit

Fig 29 is used for continuous rotation of the weights on 700bar and above

Fig 29 Power Rotation Unit Application

When the piston unit of a dead weight tester is working the piston should rotate in the cylinder. Normally, the weights on the piston are spun by hand and continues to spin for several minutes. This practice is satisfactory for most calibration requirements, and the full accuracy of the tester is attained.

In some laboratories it is necessary to maintain a steady pressure for calibration of equipment or for an experiment lasting an hour or two when it is tiresome to rotate the weights by hand. The unit can readily be fitted to existing testers or removed if not required.

 Accessories »                               Maintenance Seal kit

Models with Pressure Ranges and Specifications

The Hydraulic Dead-Weight Tester Piston units are available in six pressure ranges. Pressure Range extends from 1 bar to 2600 bar (40 000 lb/in²).

Model

BGH 120

BGH 300

BGH 700

BGH 1200

BGH 1400

BGH 2600

Pressure Ranges / Units

   1 to 120 bar            10 to 1600 lb/in²            100 to 12 000 kPa            1 to 120 kg/cm²

   2 to 300 bar            30 to 4000 lb/in²            200 to 30 000 kPa            2 to 300 kg/cm²

   1 to 700 bar            10 to 10 000 lb/in²         100 to 70 000 kPa            1 to 700 kg/cm²

   1 to 1200 bar         10 to 16 000 lb/in²        100 to 120 000 kPa         1 to 1200 kg/cm²

   1 to 1400 bar         10 to 20 000 lb/in²        100 to 140 000 kPa         1 to 1400 kg/cm²

   1 to 2600 bar         10 to 40 000 lb/in²         0.1 to 260 MPa                1 to 2600 kg/cm²

Note:   The Pressure ranges mentioned are our standard ranges. Testers with special custom Pressure Ranges and Pressure units are also supplied.

Budenberg Dead-weight Testers are supplied with the following specifications and accessories: –

Tester Base

The base has two Union Connectors (two high Pressure Cone Joint Connectors for BGH2600), One for Piston Cylinder Unit and One for Instrument to be Calibrated.
Aluminium base with ABS cover and four Adjustable feet for levelling. Twin area screw pump with needle thrust and axially located hand wheel for easy operation at high pressure.

Weights (Masses)

The different weights are manufactured from non-magnetic austenitic stainless steel for each piston units. Each weight is marked with set number, pressure and nominal area of the piston unit. Individual weights are marked with Budenberg logo. look for logo on each mass in the main weight set.

Fine Increment weights are supplied (if ordered separately) for higher resolution.

Accuracy

Standard Accuracy up to 0.015% of reading
Class A Accuracy from 3 bar to full range up to 55ppm (0.0055% of reading)

Certification

Standard Accuracy Tester is supplied with TRACEABLE Area & Mass Certificate
Class A Accuracy Tester is supplied with UKAS Area & Mass Certificate

Software

Accuracy software is available with Class ‘A’ accuracy only for correction of Piston unit temperature, Pressure Head, Ambient Pressure, Ambient Temperature & local gravity.

Standard Accessories

Tool Roll containing 2 Spanners, Spirit level, 4 Level plates, Bag of seals, Pointer Punch, Pointer Remover, 500ml VG22 Oil, and ½“, 3/8”, ¼”,BSP or NPT adaptor set (as ordered), Single Gauge Stand, Operation Manual with Certificate of Accuracy (UKAS Certificate if ordered).

BGH 1200 Hydraulic Dead-weight Tester
500ml bottle of ISO VG22

Optional Accessories

Fine Increment Weight Set, Dual Gauge Stand, ½”BSP Angle Connection, Set of BSP and Metric Adaptors, Liquid / Liquid Interface (Oil Seal), Set of Weather Proof Hard ABS Storage / Carrying case for Tester Base & Weights.

Packing for ALL MODELS except BGH2600

The BGH series tester cartons should contain:-

1 – BGH series base

1 – Gauge stand

1 – 500 ml bottle of oil

4 – Hand wheel spokes

1 – Piston/Cylinder unit (as specified in your order)

1 – Set of weights supplied in separate cartons

1 – make-up weight in bar (if bar weight set ordered)

1 – Certificate of accuracy

1 – UKAS Certificate for Class ‘A’ tester (if ordered)

1 – Class ‘A’ Accuracy software (with Class ‘A’ Tester) 

1 – Tool Roll containing:-

1 – Hexagon wrench key 3 mm A/F

2 – 30 mm A/F Open ended Spanners

1 – Spirit level

4 – Level plates

1 – Bag of start up seals

1 – G1/2 (1/2” BSP) angle connection (If ordered)

1 – Pointer punch

1 – Pointer remover

1 – Soft copy of the O & M instructions on Pen Drive

1 – Set of Connections (as ordered)

N.P.T

1 – ½” BSP(M) x ¼” NPTF

1 – ½” BSP(M) x 3/8” NPTF

1 – ½” BSP(M) x ½” NPTF

B.S.P

1 – ½” M x ¼” F   

1 – ½” M x 3/8” F     

1 – ½” M x ½” F   

METRIC

1 – M20 X 1.5

1 – M12 X 1.5

Packing for BGH2600

The BGH 2600 tester cartons should contain:-

1 – BGH 2600 base

1 – 500 ml bottle of oil

4 – Hand wheel spokes

1 – BGH 2600 Piston/Cylinder unit and overhang

1 – Set of weights supplied in separate cartons

1 – lb/in² PCU height adaptor with lb/in² weight set

1 – Certificate of accuracy

1 – UKAS Certificate for Class ‘A’ tester (if ordered)

1 – Class ‘A’ Accuracy software (with Class ‘A’ Tester) 

1 – Tool Roll containing:-

1 – Hexagon wrench key 3 mm A/F

2 – 30 mm A/F Open ended Spanners

1 – Spirit level

5 – Level plates

1 – Bag of startup seals

1 – G1/2 (1/2” BSP) angle connection (If ordered)

1 – Pointer punch

1 – Pointer remover

1 – G1/2 differential connection

1 – G3/8 differential connection

2 – Cone joint (recessed) – If ordered separately

1 – Cone joint (plain)

1 – Soft copy of the O & M instructions on Pen Drive

1 – Set of Connections (if ordered separately)

BGH 2600 Hydraulic Dead-weight Tester

N.P.T

1 – ½” BSP(M) x ¼” NPTF

1 – ½” BSP(M) x 3/8” NPTF

1 – ½” BSP(M) x ½” NPTF

B.S.P

1 – ½” M x ¼” F   

1 – ½” M x 3/8” F     

1 – ½” M x ½” F   

METRIC

1 – M20 X 1.5

1 – M12 X 1.5