Mecmesin Basic Force Gauge-HS Mk3 Bedienungsanleitung

Contents

Powering the Gauge 2

Using the Gauge 3

Optional Settings 8

Dimensions 10

BFG-HS Specification Table 11

Introduction

Thank you for choosing the Mecmesin Basic Force Gauge-

High Specification (BFG-HS) instrument. With correct use and

regular re-calibration it will give many years of accurate and

reliable service.

The Mecmesin BFG-HS is a member of a series of highly

versatile display units. By using the latest integrated circuit

technology it has been possible to produce an

instrument which can be used to measure tensile and

compressive forces accurately, whilst being simple

to use by the operator.

Before Use

Upon receiving the unit please check

that no physical damage has occurred

to the packaging material, plastic

case or the instrument itself. If any

damage is evident please notify

Mecmesin immediately.

Operation

The most commonly used features

such as displaying force, peak hold, zero

and changing of displayed units can all be done by pressing

a single dedicated key on the front panel.

For less frequently used features a number of "hot keys" are

provided, whereby the operator simply presses and holds 2

keys to enable a gauge option.

Page 1

Powering the Gauge

Fitting and charging of

rechargeable batteries

Mains operation

Fitting of alkaline batteries

Low battery symbol

The BFG-HS is supplied with a set of 5 Nickel Metal Hydride

AAA rechargeable batteries. For safety reasons during

transportation the batteries are shipped discharged. To obtain

maximum battery life we recommend that you charge them

with the charger/adaptor supplied for at least 14 - 16 hours

when you first receive the BFG-HS.

To insert the batteries you must first remove the battery cover

on the rear of the gauge by undoing the 2 retaining screws.

Fit the 5 batteries in the battery holder ensuring that you

observe polarity and the batteries are placed on top of the

‘release tag’.

To remove the batteries simply pull the ‘release tag’ and they

will be freed from the spring-loaded contacts.

Refit the battery cover and tighten the 2 retaining screws.

Connect the mains adaptor/charger to the BFG-HS charger

socket and charge the batteries for 14 - 16 hours. Only use

the adaptor/charger supplied.

The BFG-HS can also be powered directly from the mains.

This can be achieved with or without the rechargeable

batteries being fitted. Connect the mains adaptor/charger to

your mains supply. Only use the adaptor/charger supplied.

If rechargeable batteries are fitted, a trickle charge will be

applied to the batteries.

The BFG-HS can also be powered by AAA 1.5V alkaline

batteries (not supplied). For the fitting of alkaline batteries,

follow fitting instructions as per rechargeable batteries above.

Warning:

When alkaline batteries are fitted, the mains

adaptor/charger must NEVER be connected to the BFG-HS

due to risk of acid leakage which could damage the

instrument.

If the low battery symbol appears on the display the accuracy

of the loadcell reading may be compromised. The gauge

will power down after a short period of time.

Page 2

Using the Gauge

Fitting accessories

Mounting to a test stand

Powering up

Affix either the short extension rod (30mm long) or the long

extension rod (130mm long) to the loadcell probe in the hole

at the bottom of the gauge by tightening it gently with the

fingers.

Your chosen grip or accessory may now be connected to the

extension rod.

Note: When fitting a grip ensure that it is screwed finger-tight

only. Excessive torque can damage the loadcell.

On the rear of the gauge there are two M5 threaded holes,

which can be used for mounting the gauge to a Mecmesin

test stand.

Each Mecmesin test stand is supplied with a dedicated

‘dovetailed mounting bracket’ and screws for this purpose.

If you wish to mount the gauge to another type of stand,

ensure that the screws used are threaded into the gauge to a

maximum depth of 5.5mm. The final thread is peaned but if

screws are fitted beyond this depth, damage to the loadcell

will occur.

As shown in Figure 1 the control panel has 6 keys:-

To power up the gauge press

the red key. A short self

test runs during which the

display will show the model

and capacity in Newton’s.

MAX

UNITS

TXD

ZERO

RESET

BFG

200

fig.1

Page 3

After the self test, providing no load has been applied to the

instrument, the display will show all zeroes. This is because

the gauge re-zeroes itself during the self test routine.

If a force is applied perpendicularly via the sensor probe

(hole at bottom of BFG-HS), the reading on the display will

* Do not overload the transducer, as this will cause

irreparable damage.

Forces greater than 120% of full-scale will produce an

audible beep until load is released and an OL symbol will

appear on the display

for 30 seconds

Forces greater than 150% of full-scale will produce an

audible beep until load is released and an OL symbol will

appear

permanently

on the display. Consult your supplier to

arrange repair.

To power down the gauge press the red key.

Tensile forces are displayed on the BFG-HS and recognised

by the symbol

Compressive forces are displayed on the BFG-HS and

recognised by the symbol

MAX

13.45

▲

Fig. 2

Symbol for

tension

Unit of

measurement

Load indicator bar





Please note that a BFG-HS

measuring very low forces may

not show zero if it is moved

during the self test routine. Once

it is properly mounted and

zeroed the reading will be stable

Display of Tension/

Compression

If the BFG-HS has suffered a

serious overload condition, the

load indicator bar will be

partially displayed even when no

load is present. This is a warning

that the load cell is damaged

and you should immediately

contact your supplier to arrange

repair.

Page 4





Zeroing the Gauge

Changing the unit of

measurement

Max (Peak) Readings

"Max" mode

A load indicator bar alerts the operator to how much load

has been applied to the transducer. As the load approaches

the maximum rating of the transducer, the indicator bar

changes appearance when above approx. 80% of the rated

capacity. This warns the operator that steps should be taken

to prevent excessive load being applied.

For tensile forces the indicator bar is solid then dotted. For

compressive forces the indicator bar is dotted then solid – see

fig. 3b & 3c

During the operation of the gauge it is often necessary to

zero the display – e.g. when you wish to tare out the weight

of a grip, so it does not become part of the measured

reading. Press and release the ZERO key. The display will

blink momentarily as the zero operation is carried out.

You can choose from the following units of measurement

depending on the capacity of your gauge: millinewtons,

kilonewtons, newtons, gram-force, kilogram-force, ounce-force

or pound-force.

To change the display units press and release the UNITS key.

Each successive key press will select the next available units

until the gauge returns to its original setting. The BFG-HS

automatically converts readings as new units of measure are

selected.

The gauge detects and stores maximum (peak) force in both

compressive and tensile directions.

Press the MAX key. The display will show the word MAX

together with the highest tensile force and the highest

compressive force detected during the test. The current

load being applied to the transducer is also displayed.-

see fig 3a overleaf

Page 5

Press the MAX key again and the display will show the

maximum tensile force identified by the symbol.

Press the MAX key again and the display will show the

maximum compressive force identified by the symbol.

MAX

Fig. 3c

max compression

reading

MAX

42.95

MAX

▲

Fig. 3b

max tension

reading

MAX

13.45

▲

MAX

42.95

185.6

▲

Fig. 3a

max tension

reading

max compression

reading

Load currently

applied to load

cell





Dual Max

Max Tension

Max Compression

Page 6

Press the MAX key again and the word MAX has now

disappeared from the display. The display will now indicate

forces applied in both directions as they are applied to the

transducer and maintain a "running" display.

Press the RESET key to clear both maximum registers and

prepare for detecting the next maximum readings.

The BFG-HS has RS232, Mitutoyo and analogue output

signals. It is possible to transmit the displayed reading to

peripheral devices (e.g. PC, printer) by pressing and

releasing the TXD key.

Displayed readings can also be requested individually from a

PC via the RS232 interface by sending a"?" (ascii D63 [3fh]

character.

For sending a continuous data stream to a PC, press and

hold the TXD key for 2 seconds then release. TX will now

appear in the display to indicate that data is being sent. To

stop sending data, simply press and release the TXD key, at

which point TX will disappear from the display.

Please note that the continuous data stream only starts when

approx. 2% of the rated capacity of the gauge is reached.

"Normal" mode

Data Output

BFG-HS uses 9600 Baud 8 data

bits, 1 start bit 1 stop bit and no

parity

A full range of data cables are

available to connect your gauge

to peripheral devices – contact

your supplier.

Page 7

It is possible to activate a backlight on the BFG-HS display.

Press and hold RESET whilst powering up the BFG-HS with

the key. The backlight is now operating.

Please note that battery consumption is doubled when using

the backlight.

To conserve battery power, it is possible to activate an Auto-

off function so that the gauge powers down after 2 minutes

since the last key press.

Press and hold ZERO whilst powering up the BFG-HS with the

key. The symbol Ao will appear in the display to indicate

Auto-off is active.

For tension applications it is often desirable to reverse the

display, so that the operator can read it more comfortably.

By pressing and holding MAX whilst powering up the BFG-

HS with the key, the display is inverted.

If you suspect that your loadcell transducer has sustained an

overload it is possible to check the status of the loadcell

immediately.

Symptoms of overload may be (a) OL in display (b) buzzer

sound (c) probe not aligned perpendicularly to gauge (d)

load indicator bar present even under zero load.

Place the gauge horizontally on a flat level surface. Press and

hold UNITS until the password menu appears with 0000 in

the display. Press ZERO four times and you will now see 2

values shown as %.

The upper value shows the % offset when the gauge was last

successfully calibrated. The lower value shows the % offset

currently present on the gauge.

Optional Settings

Backlit

Display

Auto-off

Invert Display

Loadcell

Diagnostic test

An instrument showing an

overload condition cannot be

relied upon to provide accurate,

repeatable measurement –consult

your supplier.

Page 8

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