Phase II Plus PHT-2500 Manuale utente

Instruction Manual

(201)933-6300

www.phase2plus.com

* Precision Measuring Tools * Indexing Fixtures * Workholding Fixtures *

* Hardness Testers * Ultrasonic Thickness * Surface Finish * Coating Thickness *

Model # PHT-2500

2. FUNCTIONS OF THE PHT-2500 HARDNESS TESTER 2

2.1. Typical Applications 2

2.2 Technical Data 2

2.3 Available Functions 3

2.4 Measuring and Converting Ranges 3

* Impact device parameters 3

3. LEEB MEASURING METHOD 5

3.1 History 5

3.2 Leeb’s Hardness Tester (definition) 5

3.3 Notation of Leeb’s Hardness 6

4. PRETREATMENT OF SAMPLES 6

4.1 Pretreatment of Sample Surface 6

4.2 Curving Surface 6

4.3 Supporting a Test Sample 7

4.4 Large Test Samples 7

4.5 Test Sample Properties 7

5. KEYPAD FUNCTIONS 8

6. OPERATIONS OF THE INSTRUMENT 8

6.1 Starting 8

6.2 Setting of all testing Parameters

8-10

Choosing an impact device 8

Setting impact direction 9

Obtaining an Average 9

Selecting a Material 9

Choosing A Hardness Scale 9

Setting Limitations (upper & lower) 9

Entering Date & Time 10

Setting Memory Locations 10

Error Modification 10

Memory Functions 10

Printing Stored Data 11

6.3 Measuring Procedure 12

6.4 Arithmatic Mean of Hardness of Current Measurements 13

6.5 Shutting off the PHT-2500 13

6.6 Additional Features 14

6.7 Trouble Shooting 14

7. MAINTENANCE AND REPAIR 14

7.1 Impact Device 14

7.2 Repair 14

Figure 2: Type D Impact Device

2. Functions of the Phase II PHT-2500 Hardness Tester

Phase II PHT-2500 is an advanced, handheld hardness tester that provides high

accuracy and simplicity of operation for a wide measuring range. It is suitable

for testing the hardness of ordinary metals and is widely applied in many

industries including the petroleum, chemical, industrial machining and electric

power industries, etc.

2.1 Typical Applications

Typical hardness testing applications of the PHT-2500 include:

•Inspection of installed machinery, permanent parts of assembled systems and

heavy workpieces

•Inspection of the moulding surface of a die

•Analysis of pressure vessels, turbo generator sets, etc.

•Inspection of bearing and other mass produced parts on a production line

•Obtaining original records of test data

•Identification of metallic materials stored in a warehouse

2.2 Technical Data

•Display error ±0.8% at LD=900

(Value display – Value actual x 100)

Value Actual

•Relative repetitive display error 0.8% at LD=900

(Value max – Value min. x 100) = Error

Value Average

2.3 Available Functions

•Automatic identification of integrated impact device (D, DC, DL, D+15, C, G)

•Quick entry of a series of test numbers, test dates, sample material type and

impact direction via the keypad.

•Deletion of erroneous or incorrect previously stored test data.

•Display of the current test mode and its corresponding test data.

•Quick print out of all test results via an optional mini-printer

•User selectable display of test data in any hardness value (

HL, HRC, HRB, HB,

HV, HSD)

•

Low Battery Indicator

2.4 Measuring and Converting Ranges

Shown in Tables 1-7 are the impact devices, the corresponding measuring ranges for

each (D, DC, DL, D+15, C, G) and their allowable conversion ranges in terms of other

static hardness values (

HRC, HRB, HB, HV, HSD

) for different metals.

Probe Application

D Universal standard unit. Will handle the majority of hardness testing

applications. Weight: 75g

DC Very short impact device for those confined areas, i.e. inside bores for internal

measurements. Conforms to the Dmeasuring range.

Weight

: 50g

D+15 Very narrow contact area with a set backed measurement coil. This device is

used to measure hardness in grooves and recessed surfaces.

Weight

: 80g

C A reduced impact energy impact device

(approximately ¼ of the DType 2 ft-lb.)

for measuring the hardness of surface hardened components, coatings, thin

wall or impact sensitive components. Applies a small superficial indentation.

Weight

: 75g (will not function at –180 degrees)

G This device has an enlarged test tip, and an increased impact energy range

(approx. 9 times the D, 72 ft-lb.). Can be used on lower quality finishes for

measuring hardness in the Brinell range only (max. 650 HB). Designed to be

used with heavy components such as heavy castings and forgings.

Weight

: 250g

DL This model features a needle front section with a diameter of 4mm and a

length of 50mm. It is suitable for testing in extremely confined spaces, the

base of grooves and of special components such as gear wheels.

For use on steel and cast steel only!

DL Impact Probe

Figure 3: Optional Impact Devices

Table 2: Impact Device – D, DC Measuring Range LD:200-900

Material HRC HRB HB HV HSD

Steel 17.9-68.5 59.6-99.5 93-651 83-976 32.2-99.5

C.W. Tool Steel 20.4-67.1 80-898

Gray Cast Iron 93-334

Nodular Cast Iron 131-387

Cast Aluminum 30-159

Brass 13.5-95.3 40-173

Bronze 60-290

Copper 45-315

Table 3: Impact Device – D+15, Measuring Range LD+15: 300-900

Material HRC HRB HB HV HSD

Steel & Cast St. 19.3-67.9 80-638 80-937 33.3-99.3

Table 4: Impact Device – C, Measuring Range LC: 350-950

Material HRC HRB HB HV HSD

Steel & Cast St. 20.0-69.5 80-683 80-996 31.9-99.6

Table 5: Impact Device – G, Measuring Range LG: 300-750

Material HRC HRB HB HV HSD

Steel & Cast St. 47.7-99.9 90-646

Gray Cast Iron 92-326

Nodular Cast Iron 127-364

3. Leeb Measuring Method

3.1 History

The Leeb measuring method was first brought into measurement technology in 1978.

It is defined as the quotient of an impact body’s rebound velocity over its impact

velocity, multiplied by 1000. Harder materials produce a higher rebound velocity than

softer materials. For a specific group of material (e.g. steel, aluminum. etc.). Leeb

hardness value represents a direct relationship to its hardness properties. For ordinary

metal, conversion curves of hardness HL versus other standard static hardness (HB, HV,

HRC, etc.) are available, enabling you to convert HL into other hardness values.

3.2 Leeb Hardness Test (definition)

An impact body with a spherical test tip made of tungsten carbide is propelled against

the sample surface by a spring force and then rebounds back. At a distance of 1mm

from the sample surface, the impact and rebound velocity of the impact body are

measured by the following method: A permanent magnet embedded in the impact

body, when passing through the coil in its coil holder, induces in the coil an electric

voltage proportional to the velocities of the magnet. Leeb hardness is expressed by the

following formula:

HL = 1000 x (VB/VA)

Where: HL is Leeb Hardness

B is the rebound velocity of the impact body

Ais the impact velocity of the impact body

The voltage characteristic of output signal, when the impact body passes through the

induction coil is illustrated in the following figure:

3.2 Leeb’s Hardness Tester (definition)

A Leeb’s Hardness Tester measures the hardness of sample material in terms of

Hardness Leeb (HL), which can be converted into other Hardness units (Rockwell B and

C, Vicker, Brinell and Shore D).

3.3 Notation of Leeb’s Hardness

•When measuring the hardness of a sample material using the traditional static

hardness testing method, a change of applied pressure will result in a change in

the hardness reading. This will also happen during a Leeb’s Hardness test when

you change the impact device. In measuring the hardness of the same test

sample with different impact devices, the Leeb’s hardness values obtained will

vary.

For Example: 720 HLD≠720 HLC

•Because different converting curves are obtained from different impact devices,

when converting hardness L into another hardness value the notation for the

converted hardness value should include the impact device used.

For example:

Hardness HV converted from hardness L using impact device D+15

Should be written as 22, 8 HV LD+15

Where: 22=hardness value HL

8=hardness value HV

L=Leeb’s Method

LD+15-impact device

Hardness HRC converted from hardness L using impact device D should be

written as 35, 9 HRCLD

Where: 35=hardness value HL

9=hardness value HRC

L=Leeb’s Method

D=Impact device

4. Pretreatment of Samples

4.1 Pretreatment of Sample Surface

To eliminate hardness errors resulting from the roughness of a sample’s surface when

using impact device D, DC or D+15, the test surface should be polished until its

roughness Ra is no more then 2µm. PHASE II SRG-1000 handheld surface roughness

tester or any other suitable instrument may be used to measure the surface roughness

of the sample material. The test surface should be clean and free from oil stains.

4.2 Curved Surface

When testing a curved surface with a radius of curvature Rless than 1.2 in (30mm), a

special small support ring washer should be used to compensate the curvature.

4.3 Supporting a Test Sample

When using impact devices D, DC or D+15 (Impact energy=9ft/lbs), please refer to the

following support requirements:

•For test samples weighing over 11 lbs. (5 kg), no support is required.

•Samples having a cantilever or thin shell shape and weighing between 4.4 to 11

lbs. (2 to 5 kg) must be firmly coupled to bearing supports weighing over 11 lbs.

(5 kg) in order to prevent bending, deformation or displacement due to the

impact force.

•Test samples weighing less than 4.4 lbs. (2 kg) should be firmly coupled to a

support weighing over 11 lbs. (5 kg).

•The coupling surface between the sample and the support should be smooth.

•A moderate, non-excessive amount of coupling paste should be applied between

the coupling surfaces when testing thin cross section pieces with larger massed

support plates.

•The direction of impact should be perpendicular to the coupled surface.

•Minimum weight of a test sample should be 0.2 lbs. (100 g).

•Minimum thickness of a test sample should be 0.2 in (5 mm).

•Minimum depth of hardened layer should be 0.03 in (0.8 mm).

•The testing surface of the sample should be perpendicular to the impact

direction.

Note: The above restrictions referring to the rigidity of test samples can be decreased

when Type C(2ft/lbs) impact device is used as should be increased when Type G (72

ft/lbs.) is used.

4.4 Large Test Samples

When the test sample is a large plate, long bar or bent work piece, the impact force

can cause a deformation or instability when the impact device is released. This may

bring about an error in measurement, even if the weight or thickness of the test sample

seems applicable. In this case, a reinforcement should be attached to the back of the

sample surface opposite to the impact force.

4.5 Test Sample Properties

Requirements for a sample’s weight thickness and roughness differ for each impact

device, as shown in Table 8.

Table 8: Sample Requirements for Hardness Testers

Sample

Sample Weight(kg) Min. Thickness

(mm)

Max. Roughness

(or Min. Fineness)

Impact

Device

Needs

Support

Needs to

stabilized

strength-

eing

needed

Sample

Hardened

layer

ISO Ra Rz

D, DC,

D+15

0.05-2 2.5 >5 3 0.8 N72µ10µ∇6

G 0.5-5 5-15 >15 10 N9 7µ30µ∇4

C 0.02-

0.05

0.5-

1.5

>1.5 1 0.2 N5 0.4µ2.5µ∇8

5. Keypad Functions

Shown in Fig 6 are the keypad function buttons.

Top left button Scroll up (Back light)

Top right button Delete last test

Middle left button Scroll down

Middle right button Memory recall

Bottom left button Power on/off

Bottom right button Menu display/Save entry button

6. Operation of the Instrument

6.1 Starting

Insert the plug of the impact device into the processor and switch on the power .

The LCD will display the same settings that were previously set. If the display meets

your current testing requirements, you can start the test immediately. If not, you can

enter your required settings using the keypad.

6.2 Setting of all Parameters

•

Choosing an Impact Device

Press the button to go to the main menu. Use the button to scroll down to:

2. Impact Device. Press the button to enter this parameter. Press the button

to scroll across to the desired impact device. When the desired device is highlighted,

you must press the button to save entry.

•

Setting your Impact Direction

While in the main menu, use the button to scroll down to: 3. Direction. Press the

button to enter this parameter. Use the button to move the cursor until you

reach the desired direction. Press the button to save this entry.

Figure 7: Impact Direction

•

Obtaining an Average

While in the main menu, use the button to scroll down to: 4. Average Times.

Press the button to enter this parameter. Use the button to change the

test/average times from 2 times to 8 times. Press the button to save entry. This

function allows you to view the average of the amount of tests you entered.

Example

: If you chose “3”. The tester will show the average after 3 consecutive tests.

All test results will be shown on the display.

•

Selecting a Material

While in the main menu, press the button to scroll down to: 5. Material. Press the

button to enter this parameter. Use the button to scroll down the list until the

desired material is reached. Press the button to save entry.

•

Choosing a hardness Scale

While in the main menu, press the button to scroll down to: 6. Scale. Press the

button to enter this parameter. Use the buttons to scroll across the 6

choices of hardness scales. When the desired scale has been highlighted, you should

press the button to save this entry.

•

Setting Limitations

(upper & lower)

While in the main menu, use the button to scroll down to: 7. Tolerance. Press the

button to enter this parameter. Using the button to change the numbers and the

button to change columns, you can enter your desired upper and lower limitations.

What this parameter allows the tester to do is signal you when a particular test has

fallen outside the set limitations. The LCD display will read as follows:

over range-repeat

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