Nova-Tech PW Series User Manual

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Adam Equipment

PW SERIES

(P.N. 8081, Revision E4, September 2007)

Software rev.: 2.43 & above

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TABLE OF CONTENTS

1.0 KNOW YOUR BALANCE .......................................................................................... 5

2.0 SPECIFICATIONS .................................................................................................... 6

3.0 UNPACKING THE BALANCE ................................................................................... 7

4.0 LOCATING THE BALANCE ...................................................................................... 7

5.0 SETTING UP THE BALANCE ................................................................................... 8

5.1 ASSEMBLING THE BALANCE............................................................................. 8

5.2 LEVELLING THE BALANCE................................................................................. 8

5.3 WARM-UP TIME................................................................................................... 8

6.0 DISPLAY ................................................................................................................... 9

7.0 KEYPAD .................................................................................................................. 11

7.1 NUMERIC ENTRY METHOD.............................................................................. 11

8.0 INPUT/OUTPUT ...................................................................................................... 12

9.0 OPERATIONS ......................................................................................................... 13

9.1 INITIALISATION ................................................................................................. 13

9.2 PASSCODES...................................................................................................... 13

9.3 WEIGHING ......................................................................................................... 14

9.3.1 Weighing Units............................................................................................. 14

9.4 FUNCTIONS ....................................................................................................... 15

9.4.1 Parts Counting ............................................................................................. 16

9.4.2 Percent Weighing......................................................................................... 17

9.4.3 Check Weighing........................................................................................... 18

9.4.4 Animal / Dynamic Weighing ......................................................................... 19

9.4.5 Net/Total ...................................................................................................... 22

9.4.6 Density Determination.................................................................................. 23

10.0 CALIBRATION ...................................................................................................... 25

10.1 MANUAL CALIBRATION .................................................................................... 25

10.1.1 Calibration using Internal Calibration mass.................................................. 25

10.1.2 Calibration using External Calibration mass ................................................ 25

10.2 AUTOMATIC CALIBRATION.............................................................................. 26

10.3 CALIBRATION ERRORS.................................................................................... 26

11.0 RS-232 INTERFACE ............................................................................................. 27

12.0 ERROR CHECKING ............................................................................................. 30

13.0 SUPERVISOR MENUS ......................................................................................... 30

13.1 ENABLE WEIGHING UNITS............................................................................... 31

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13.2 ENABLE WEIGHING MODES ............................................................................ 31

13.3 ENABLE SERIAL INTERFACE PARAMETERS ................................................. 31

13.4 SETUP PARAMETERS ...................................................................................... 33

13.5 CALIBRATION SETUP ....................................................................................... 34

13.5.1 INTERNAL CALIBRATION MASS ADJUSTMENT ...................................... 35

13.6 PASSCODES...................................................................................................... 36

13.6.1 Forgotten Passcodes................................................................................... 37

14.0 PERIPHERALS .................................................................................................... 37

14.1 DENSITY DETERMINATION KIT ....................................................................... 37

14.2 ANTI-VIBRATION TABLE................................................................................... 37

14.3 ADAM PRINTERS .............................................................................................. 37

15.0 SAFETY AND MAINTENANCE ............................................................................. 38

16.0 TROUBLE-SHOOTING ......................................................................................... 38

17.0 REPLACEMENT PARTS AND ACCESSORIES ................................................... 42

18.0 SERVICE INFORMATION .................................................................................... 42

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1.0 KNOW YOUR BALANCE

Thank you for selecting the PW Balance.

This Instruction Manual will familiarise you with the installation, accessories, trouble-shooting, after sales service information, general maintenance of the balance, etc. and will guide you through the various applications.

Please read this Manual thoroughly before starting the operation. If you need any clarifications, feel free to contact your supplier or Adam Equipment.

PRODUCT OVERVIEW

The PW balances are ideal for laboratory and general purpose weighing. The balances can also be used for some advanced weighing functions.

FEATURES:

• Large easy to read LCD display with backlight

• Standard applications include weighing, check weighing, percentage weighing, parts counting, animal / dynamic weighing, net / total and density determination

• Internal Calibration using motorised internal calibration weight or external calibration, if set by the user

• Bi-directional RS-232 interface

PW series

• Can be configured to print a GLP Compliant report after each calibration to include the time, date, balance number and a verification of the calibration

• Automatic temperature compensation

•

Display in 4 languages- English, French, German and Spanish

•

Multiple weighing units

•

Capacity tracker

•

Date and time

•

Easy to use, sealed keypad

•

Below balance weighing facility

•

Password protection

•

Security locking point

•

Robust metal casing

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2.0 SPECIFICATIONS

Model PW 124 PW 184 PW 214 PW 254

Maximum Capacity 120g 180g 210g 250g Readability 0.0001g Tare Range Full Repeatability (S.D.) 0.00015g 0.0002g Linearity (±) 0.0002g Units of measure grams, milligrams, carats, ounces, pounds, troy ounce, grains,

pennyweights, drams, taels (Hong Kong, Taiwan and Singapore),

mommes, tolas, ticals and newtons Interface RS-232 bi-directional Operating temperature Power supply Output voltage 15 VDC, 800 mA through

External Power Supply Module- supplied as standard

(Input Voltage 100–240 V, 50/60 Hz)

Calibration Calibration with internal mass. Alternatively the user can chose to

calibrate using an external mass External Calibration mass Display Backlit LCD with dual digits (24 mm high) and capacity tracker Draught shield Supplied as standard (factory fitted) Draught shield dimensions Housing Die cast aluminium housing with glass weighing chamber Pan size Overall dimensions (wxdxh) Net weight 12 kg Applications Weighing, Check weighing, Percentage weighing, Parts counting,

Animal / dynamic weighing, Net / total and Density determination

+ 10°C to 40°C

100 g

202 x 524 x 275 mm

90 mm ø

265 x 524 x 275 mm

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3.0 UNPACKING THE BALANCE

Remove the balance from the packing by carefully lifting it out of the box. Inside the box you will find everything needed to start using the balance-

 AC adapter  Rectangular base plate  Locating disc  Weighing platform  Guard ring  Stainless steel top pan



This User Manual

4.0 LOCATING THE BALANCE

• The balance should not be placed in a location that will reduce the accuracy.

• Avoid extremes of temperature. Do not place in direct sunlight or near air conditioning vents.

• Avoid unsuitable tables. The table or floor must be rigid and not vibrate.

• Avoid unstable power sources. Do not use near large users of electricity such as welding equipment or large motors.

• Do not place near vibrating machinery.

• Avoid high humidity that might cause

condensation. Avoid direct contact with water. Do not spray or immerse the balances in water.

• Avoid air movement such as from fans or opening doors. Do not place near open windows or air-conditioning vents.

• Keep the balance clean. Do not stack material on the balances when they are not in use.

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5.0 SETTING UP THE BALANCE

5.1 ASSEMBLING THE BALANCE

• Locate balance on solid surface, free from vibration

• Open the sliding door and gently place the square base plate, the

locating disc, weighing platform, the guard ring and then the stainless steel top.

• Level balance using the adjustable feet and spirit level

• Connect the power to the balance

• For best performance, let the balance warm up for 30-60 min. and

calibrate before using

5.2 LEVELLING THE BALANCE

After placing the balance in a suitable place, level it by using the spirit level. To level the balance turn the two adjustable feet at the rear of the balance until the bubble in the spirit level is centred.

5.3 WARM-UP TIME

Attach the power supply cable to the connector on the rear of the balance. Plug the power supply module into the mains. The display will indicate the balance serial number (if set) and the software revision number followed by the capacity of the balance. Next the balance will run a self-test by displaying all segments followed by a symbol indicating the balance is in busy mode. If the balance serial number is not set the display will show dashes. The display will show zeroes accompanied by the

0

symbol. If the balance is not used for a long time, it will go back to the auto-calibration mode.

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Before you start weighing, you have to wait for the balance to achieve a stable internal temperature. Typical initial warm-up time suggested for a balance already at room temperature is about 1 hour.

A stable sign ~ is shown when the balance is stable. It will turn off if the balance is not stable.

6.0 DISPLAY

The LCD has several areas-

- A large 7 digit area to display the weight with symbols for common weighing units on its right and symbols for zero, tare (Net) and stability on the left.

- A 10 digit area which allows a large amount of flexibility for displaying text messages concerning menus, operation and errors, for example to display the current weighing mode or to guide the user through processes such as density determination

- A percentage indicator known as capacity tracker which is a 0-100% bar graph consisting 10 large segments for indicating the percentage of the total balance capacity used and arrows for check weighing.

Exact zero is shown when the on to the left of the display area.

“

0

“

symbol is

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SYMBOLS AND TEXT

The LCD has unique symbols to indicate the following:

0

g, mg, ct, oz, lb, ozt, GN, dwt, dr, tl H, tl T, tl S, MM, T, ti, N, g/cc, Pcs, %, M, and S

Zero

Busy

Stable

A bar graph with set point markers

Text is shown for the weighing units and modes

INDICATORS

“

CAL

“ºC”

“ti” “

Net

“

PARTS

“

PERCENT

“NT” “0%”, “

”

100%

When calibration is occurring or about to occur When a temperature is shown or a temperature driven calibration is to

occur For a time driven calibration

When a net weight is shown When the balance is in the Parts counting mode When the balance is in the Percent weighing mode When the balance is in the Net/ Total mode When the capacity tracker is showing percent of maximum range used

”

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7.0 KEYPAD

The keypad has the following keys to operate the balance.

Keys Primary function Secondary function

[0/T] or [Esc] [Unit] /  or [Down]

[Mode] /  or [Advance]

[Print] /  or [Back] [Cal] / or  [Up]

[Setup]/

or [Enter]

To turn the balance to ON or Standby A combined zero and tare function Selects weighing units by cycling through a set of enabled units Enters the Modes To advance a flashing digit

Instructs the balance to print data Starts the calibration function To increase or change a

Enters the Setup parameters (Supervisor Menus)

To escape from setup functions and modes To decrement or change a displayed value or scroll through options backwards

by one position to the right. To go back by one step during setup functions To advance a flashing digit by one position to the left

displayed value or scroll through options forward Enters a function or saves a value while manually entering unit weight or check weighing limits

7.1 NUMERIC ENTRY METHOD

To set a value when required, use the keys as given below-

- [Up] and [Down] keys to increase or decrease the flashing digit,

- [Advance] and [Back] keys to advance or move back the digit and

- [Enter] key to accept the value

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8.0 INPUT/OUTPUT

The rear panel has connectors for RS-232 serial and a power input socket. Required power input is a low-voltage external supply, 15VDC @ 800mA.

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9.0 OPERATIONS

9.1 INITIALISATION

When the balance is first switched on, it will display the balance serial number (if set), software revision, model capacity and then all segments on the display will be shown. Overall the time taken is usually 5 -10 seconds.

If a operator passcode has been set, the display will show “PASSCODE” and the main display will show a zero. In this case you must enter the passcode to continue using the numeric entry method (see section 7.1). A different passcode may be set for a Supervisor to weigh or to have access to the selected User menus. If the passcode has not been set the balance will continue as below.

The display will show zero reading along with the zero symbol “

0”

and the weighing unit last used. If automatic time calibration is enabled the balance will calibrate 15 minutes after power up and again after the pre-set time interval.

9.2 PASSCODES

If a passcode has been set to limit access to the weighing functions of the balance the display will show “PASSCODES” with the main digit set to zero. Use the numeric entry method (see section 7.1) to enter the code. The display will change to show 7 digits set to zero with the rightmost digit flashing. Use the numeric entry method (see section 7.1) to enter the code. Ensure to enter the correct passcode to continue. See the Section 13.6 for details.

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9.3 WEIGHING

• Press [0/T] to zero the balance, if required

• “0 “ will be displayed

• Place a mass on the pan and the weight will be displayed

• If a container is used press [0/T] to tare the balance when the

balance symbol “~” is on. “Net” will be displayed to indicate that the balance is tared

• When the display shows zero, place the item to be weighed. Only the net weight will be displayed. The capacity tracker at the bottom of the LCD will indicate the weight graphically with respect to the maximum weighing capacity

• At any time the [Unit] key can be pressed to select another unit. Use the [Up] or [Down] key to scroll through the units and select the desired unit by pressing the [Enter] key, the display will change to show the weight in the selected weighing unit. The available weighing units can be enabled or disabled by the user (see section 13.1). Only weighing units that have been enabled will be cycled through when the [Unit] key is pressed

9.3.1 Weighing Units

You can select alternative weighing units to display the weight by pressing the [Unit] key. The common weighing units are:

Unit Symbol Models Conversion Factor

1g =

1 GRAMS g All 1 1.0

2 MILLIGRAMS mg All 1000 0.001

3 CARATS ct All 5 0.2000

4 PENNYWEIGHTS dwt All 0.643014865 1.555174

5 GRAINS GN All 15.43236 0.0647989

6 TROY OUNCES ozt All 0.032150747 31.103476

7 OUNCES oz All 0.035273962 28.349523

8 POUNDS lb All 0.0022046 453.5924

9 DRAMS dr All 0.564383422 1.7718451

10 HK TAELS tl H All 0.026717251 37.42900

11 TAIWAN TAELS tl T All 0.026666702 37.49995

12 SING TAELS tl S All 0.026455464 37.799375

13 MOMMES mm All 0.266666951 3.749996

Conversion Factor

1 unit = grams

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14 TOLAS T All 0.085735323 11.663804

15 TICAL ti All 0.0612395 16.32933

16 NEWTONS N All 0.00980665 101.921623

17 CUSTOM Custom All As specified As specified

It is possible to set the balance to display only grams. Grams will always be one of the units selected, by default.

The balance displays the alternate weighing units with as much precision as possible. For example, the 250g x 0.0001g balance could weigh up to:

Unit Maximum d = g 250g x 0.0001g

mg 250000.0 0.1 ct. 1250.0000 0.0005 dwt 160.7537 0.0001 GN 3858.090 0.002 ozt 8.037685 0.000005 oz 8.818490 0.000005 lb 0.551150 0.000001 dr 141.0958 0.0001 tl.T 6.666675 0.000005 tl.H 6.679310 0.000005 tl.S 6.613865 0.000005 MM 66.6665 0.0005 T 21.43383 0.00001 ti 15.30987 0.00001 N 2.451662 0.000001

9.4 FUNCTIONS

When weighing, the user can access the applications that have been enabled (see section 13.2).

The following applications are available in this version:

• Weighing

• Parts counting

• Percent weighing

• Check weighing

• Animal / dynamic weighing

• Net/Total

• Density determination

The selectable functions can be enabled using a similar method to the Units above by turning the functions on or off.

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9.4.1 Parts Counting

This allows the user to weigh a sample of parts to compute an average unit weight and then determine the number of items being weighed by dividing the net weight by the unit weight value. The result is always a whole number of parts.

The balance will have a preset number of parts to be used as a sample. These values are 10, 25, 50 or 100 items.

Steps:

• Press [Mode] to show parts counting, “PARTS” will be displayed

• Enter parts counting by pressing [Enter]

• Press the [Up] or [Down] key to select the sample size, “REF QTY”,

10, 25, 50, 100, etc., then press [Enter] to confirm

• When “LOAD XX Pcs” is shown place XX number of items on the pan and press [Enter] to compute the average piece weight. Display will indicate the total weight in the last selected unit and then show “XX Pcs” sounding a beep. A message “PARTS” will be prompted on the top of the display to indicate that the balance is in the parts counting mode

• Remove the sample and display will show “0 Pcs”.

• Place an unknown quantity on the pan. The balance will then compute

the number of parts based on the average piece weight. The display will show the result in Pcs

• To count another item press [Mode] and continue as before

• Checks will be made to determine that the weight of the reference parts

is large enough for reasonably accurate counting (weight of each piece should be > 1d)

• To return to normal weighing, press [Esc]

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9.4.2 Percent Weighing

Percent weighing will be done by defining a certain weight to be 100%. The weight to be used can either be entered by the user or taken from a sample

• Press [Mode] and then the [Up] or [Down] key to select Percent weighing, “PERCENT” will be displayed

• Press [Enter] to enter the function

• Display will show, “PERCENT SAMPLE”

• Press [Enter] to select the sample method or skip to manually enter the

sample weight as given below

• When “LOAD 100 %“ is shown, add the sample

• Press [Enter] to set this weight to be 100%. The display will show “REF

WT” and the sample weight in the last selected unit. After a while “100%” will be displayed. A message “PERCENT” will be prompted on the top of the display to indicate that the balance is in the percent weighing mode

• Remove the sample and “PERCENT 0.00%” will be displayed

• Place an unknown sample to display the percentage weight

• To set another weight as 100%, press [Mode] and continue as before

• To manually enter a value to be set as 100%, press [Up] or [Down] key

when “PERCENT SAMPLE” is shown to select “PERCENT Ent Wt”

• Press [Enter]. Display will show the value in the unit, last used in the weighing mode

• Enter the weight using the numeric entry method (see section 7.1).

• Place unknown sample to display the percentage weight

• To perform percent weighing with another sample press [Mode] and

continue as before

• To return to normal weighing, press [Esc]

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NOTE: Percentage will be displayed to the maximum number of decimal places based on the resolution of the balance. To increase or decrease by one decimal place, press the [Up] or [Down] key respectively.

9.4.3 Check Weighing

During weighing of a sample the balance can be set to show if the weight is above or below an upper and a lower limit. The display will use the arrows under the bar graph to show the check weighing is operating. The arrows and bars between the arrows will indicate when the weight is below the lower limit, between the limits or above the upper limit.

The buzzer can be set to be active when the weight is outside the limits (below the lower or above the upper) or within the limits (above the lower and below the upper limit), or turned off. If desired, only one limit needs to be set. If only one limit is set the other limit is considered to be zero (lower) or the maximum (upper).

The Check weighing is not active when the weight is less than 20d. This is the minimum weight at which the indicator bars are displayed and the buzzer sounds, if it is not set to OFF (see the next page).

Steps:

• Press [Mode] and then the [Up] or [Down] key to select Check Weighing. When “CHECK” is displayed press the [Enter] key to enter Check Weighing mode

• Press [Up] or [Down] to set the “LOW LIMIT” to “On” or “OFF”

• Press [Enter] to proceed. If the “LOW LIMIT” was set to “On” the

display will show the current low limit in the unit, last used in the weighing mode. You may change the limit using the numeric entry method (see section 7.1).

• Press [Enter] to proceed

• If the “LOW LIMIT” was set to “OFF” or the setting of the low limit is

complete, then the display will change to “HIGH LIMIT”. Use [Up] and [Down] to set the “HIGH LIMIT” to “On” or “OFF”

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(Beeper will sound when the weight on the pan is

• Press [Enter] to proceed

• If the “HIGH LIMIT” was set to “On”, the display will show the current

high limit in the last selected unit which can be changed in the same way as in case of “LOW LIMIT”

• Press [Enter] to proceed

• Next the beeper setting is displayed. Press [Up] or [Down] to scroll

through the options –

“BUZZER OFF” (Beeper set to off at all times) “BUZZER In”

stable and within the limit)

“BUZZER Out” (Beeper will sound when the weight on the pan is

stable and outside the set limits)

• Confirm the beeper setting by pressing [Enter]

• When a weight is placed on the pan now, the display will indicate

whether the weight is below the LOW LIMIT between the LOW and HIGH LIMITS or higher than the HIGH LIMIT using the capacity tracker,

• To perform check weighing with another sample press [Mode] and continue as before

• To return to normal weighing, press [Enter]

9.4.4 Animal / Dynamic Weighing

The balance can be set to weigh animals or moving items, also known as dynamic weighing. The balance will collect the weight over a period of time to arrive at an average value and display the value till the operator resets the balance. The actual weighing process can begin either automatically when the weight is placed on the pan or when initiated by the operator. The weighing unit can be selected as normal using the [Unit] and [Enter] keys, before entering the Animal / Dynamic Weighing process.

Steps:

• Press [Mode] and then the [Up] or [Down] key to select Animal / Dynamic Weighing. When “ANIMAL” is displayed press [Enter] to enter Animal Weighing mode

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• Press [Up] or [Down] to select “rUN” for starting the animal / dynamic weighing using the method previously set or “SEtUP” to set up the balance for animal weighing (see the section 9.4.4.1 Animal Weighing

Setup Parameters)

MANUAL MODE

When the balance is in the MANUAL mode –

If [Enter] is pressed when “rUN” is selected, balance will display “START ?”

Place the item on the pan and press [Enter] again

The result will be displayed by showing “FINISHED xx.xx x” after a pre-set time Delay and Sampling period (see the section 9.4.4.1 Animal Weighing

Setup Parameters)

AUTO MODE

When the balance is in the AUTO mode –

If [Enter] is pressed when “rUN” is selected, balance will display “LOAD PAN”

Place the item on the pan. The animal weighing test will begin automatically

After the configured Delay and test time are computed by the balance, the result will be shown displaying “FINISHED xx.xx x” (see the section 9.4.4.1 on Animal Weighing Set-Up Parameters)

• During animal weighing if the [Print] key is pressed, the balance will display “PAUSED” and show the current average

• To resume, press [Print] again or

• Pressing [Mode] will display “STOPPED” and terminate the weighing

• Remove the item from the pan

• Press [Mode] to go back to “ANIMAL rUN” to weigh another item or

[Esc] to return to normal weighing

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9.4.4.1 Animal Weighing Setup Parameters

• Press [Mode] and then [Up] or [Down] to select Animal Weighing. When “ANIMAL” is displayed press [Enter] to enter the function

• Press the [Up] or [Down] key to select “rUN” or “SEtUP”

• Press [Enter] to select “SEtUP” to set up the balance for animal

weighing

• Use the [Up] or [Down] key to scroll through the options for setting up the mode. The display will show “MODE AUTO” or “MODE MANUAL”.

• Select “MANUAL” or “AUTO”

If “AUTO” is selected-

Threshold (During AUTO mode only)

• The display will next show “THRESHOLD XX g” where XX is the minimum weight of the item required by the balance to start the process for animal weighing. The value will be shown in the last selected unit.

• The XX can be changed from 1 to 99 using the numeric entry method (see section 7.1)

• To confirm the desired value, press [Enter]

Test time

• After [Enter] is pressed to select “MODE MANUAL” or “MODE AUTO”, it will display “TEST TIME XX”, where XX is the number of seconds over which the balance will average to compute the final weight as set during last operation

• The XX can be changed from 1-200 using the numeric entry method (see section 7.1)

• To confirm the desired value, press [Enter]

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Delay

• Next, the display will show “DELAY XX” where XX is the time in seconds taken by the balance before the sampling starts

• The XX can be changed from 0-200 using the numeric entry method (see section 7.1)

• To confirm the desired value, press [Enter]

9.4.5 Net/Total

This function allows the user to see the total of all the net weights, the value of which is displayed on smaller digits above the main display. The current net weight is shown on the main display. The [Tare] key functions the same way as in the normal weighing.

Steps:

• Press [Mode] and then [Up] or [Down] to select Net/Total. When “NET/TOT” is displayed press [Enter] to enter the function. The display will show zeros in both the display areas accompanied by the symbol “NT” indicating that the balance is in the Net/Total mode

• Place the first item. The net weight will be displayed in the main display and the smaller digits will still display zeros

• Press [Enter]. The main display will show zeros and the smaller digits will show the first net weight as total net weight

• Place a second item on the pan without removing the first one. The main display will show the weight of the second item and pressing [Enter] will make it show zeros and the smaller digits to show the total of both the items

• Continue until all the items are added to the pan

• When finished press [Mode] to transfer the total of the net weights to

the main display

• Pressing [Print] will print a report containing individual net weights followed by the final net weight total.

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9.4.6 Density Determination

It is possible to determine the density of solids or liquids using this mode. The user selects the type of density to be determined and then enters values to be used by the balance.

The density mode allows the user to use a special Density Kit or use the below pan weighing facility to perform the necessary weighing.

DENSITY OF SOLIDS

To perform the density of solids test, the user must have a method to immerse the sample in the chosen liquid. The density of the liquid must be known or determined from a look-up table.

For water and ethanol the density will be calculated based on the temperatures entered using the numeric entry method (see section 7.1)

Steps:

• Press [Mode] and then [Up] and [Down] keys to select density

• Press [Enter] to enter Density mode.

• Press the [Up] and [Down] keys to select the solids or Liquid method

when “DENSITY SOLId”” or “DENSITY LIqUId” is displayed

• Press [Enter] to select the solids method

• Press [Up] or [Down] to select the liquid - Water, Ethanol or Other

• Press [Enter] to select the choice. For water and Ethanol the

temperature will be asked for. Enter the temperature using the numeric entry method (see section 7.1)

• For the “Other” choice the density will be asked for. Enter the density (g/cc) using the numeric entry method (see section 7.1)

• Press [Enter] to continue

• The balance will request the weight of the sample in air by displaying

“AIR WEIGHT”. Place the item on the pan or receptacle, if the density kit is used and press [Enter]. The weight will be shown in the last selected unit

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• After completion of the air weighing, the balance will request the weight in liquid by displaying “LIQUID WT”. Submerge the item in the liquid and press [Enter] to start the liquid weighing. The weight will be shown in the last selected unit. After completion of the liquid weighing, the balance will compute the density of the sample and display it as “DENSITY XXXX g/cc”

• Remove the item from the pan

• Press [Mode] to continue with a new sample or press [Esc] to return

to normal weighing

DENSITY OF LIQUID

When finding the density of a liquid, it is necessary to weigh a sample of known volume in air and then in the liquid. The volume of the sample must be entered by the user. The last known volume is stored for use at any time.

If using the density determination kit, the volume of the plumb is marked on its support, i.e. 10.123

Steps:

• Press [Mode] and then [Up] and [Down] to select Density

• Press [Enter] to select the Density mode

• Use [Up] and [Down] to scroll through the solid or liquid method

• When “DENSITY LIqUId” is shown, press [Enter] for the liquid method

• The volume will be asked for. Enter the volume using the numeric entry

method (see section 7.1) or continue using the last volume entered

• Press [Enter] to continue

• The balance will request the weight in air by displaying “AIR WEIGHT”.

Place the glass plumb supplied with the density determination kit in air on the weighing pan and press [Enter] to start the air weighing. The value will be shown in the last selected unit.

• After completion of the air weighing, the balance will request the weight in liquid by displaying “LIQUID WT”. Submerge the item in the liquid and

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press [Enter] to start the liquid weighing. The weight will be shown in the last selected unit. After completion of the liquid weighing, the balance will compute the density of the sample and display it as “DENSITY XXXX g/cc”

• Remove the item from the pan

• Press [Mode] to continue with a new sample or press [Esc] to return

to normal weighing

• Pressing [Print] will print the density value in g/cc.

10.0 CALIBRATION

The PW series can only be calibrated using either an internal mass (default method) or an external mass (if setup by the user). See the User Parameters section.

10.1 MANUAL CALIBRATION

Pressing the [Cal] key will start calibration. Calibration can also be initiated by a change in internal temperature or a set time period as determined by the user (see section 13.5).

10.1.1 Calibration using Internal Calibration mass

• Check the display is at zero. Tare if necessary

• Calibration will begin automatically. When calibration is complete the

balance will return to weighing.

10.1.2 Calibration using External Calibration mass

• Pressing [Esc] will abort the calibration at any time

• Press the [Cal] key

• The display will show the balance setting a new Zero condition by

showing “LOAD 0”. Make sure the pan is empty then press the [Enter] key to continue

• The display will show the busy symbol and then will ask for the value of the calibration mass to be entered sounding a beep and displaying the default calibration mass. For example, “CAL MASS 100,000 g” where

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100g is the default calibration mass. Using the numeric entry method, the user may alter the displayed value to any value ranging from onethird to full capacity of the balance.

• The balance will then show the value of the calibration mass selected sounding a beep

• Place the selected mass on the balance. Press [Enter] to continue

The display will show the busy symbol and after calibration is complete it will display “UNLOAD” sounding a beep. Remove the weight. Another beep will be heard confirming the unloading action. The balance will then return to normal weighing.

10.2 AUTOMATIC CALIBRATION

The balance will have the ability to calibrate (or ask for calibration) when the balance has automatic calibration enabled and the conditions of the automatic calibration have been meet.

Conditions that will cause an automatic calibration are:

1. Internal temperature change greater than a preset amount, typically

0.5ºC for the Analytical balances.

2. Time since last calibration exceeds a preset time, typically 4 hours or 15 minutes after power is applied.

The calibration will be done automatically when the balance is at a stable zero. . The user knows a calibration is asked for by the flashing of the “CAL” symbol on the display. The display will show a 5 second countdown when calibration will start. If the user presses the [Esc] key the calibration will be delayed one minute to allow time for a process to be finished.

For external calibration the balance will call for calibration to be performed by flashing the “CAL” symbol on the display. As soon as the balance is calibrated the symbol will be turned off.

The Auto calibration feature can be enabled, disabled or changed within the user options to meet the requirements of the users.

10.3 CALIBRATION ERRORS

Occasionally during calibration an error will be detected. These errors can be caused by:

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Unstable readings Improper calibration weights being used Large shifts of zero from the factory settings

When an error is found a displayed message will be shown and the calibration must be done again. If the balance has error messages more than once it is possible the mechanics have been damaged.

11.0 RS-232 INTERFACE

The balances have the ability to send or receive data over the serial interface.

The weighing data can be sent over the interface either automatically or when the user presses the [Print] key.

The user has control over what data is to be printed.

The following gives a description of the RS-232 interface.

HARDWARE

The RS-232 interface is a simple 3 wire connection. The input and output connections are:

Connector: 9 pin D-sub miniature socket Pin 2 input to balance RXD Pin 3 output from balance TXD Pin 5 Signal ground GND

Handshaking is not applied.

Baud rate: 4800, 9600, 19200, 38400

Parity: NONE (=8N1), EVEN (=7E1) or ODD (=7 O 1)

All lines are terminated with carriage return and line feed (<CR><LF>).

In continuous output mode, or if single-line output on demand is selected, the serial output format will be a single line in the form “123.4567 g<CR><LF>”.

The format of the single-line output will change depending on the mode in which the balance is operating, as described below. If output on demand is selected, the user may optionally configure the serial output as a choice of 3 styles of form, either in a default format or in one of two custom formats. Each of the custom formats can be configured to output up to 15 lines of data. The data types that can be printed are:

NAME TEXT PRINTED

ID number ID no.: xxxxxxxxxxxx Serial number Serial no. xxxxxxxxxxxx

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Date DATE dd/mm/yyyy Time TIME hh:mm:ss Net weight Net: xxx.xxxx g Gross weight Gross: xxx.xxxx g Tare weight Tare: xxx.xxxx g Unit weight Unit wt: xxx.xxxx g Count Count: xxxx pcs Reference weight Ref. wt: xxx.xxxx g Percent Percent: xx.xxx % Checkweigh lower limit Low: xxx.xxx g Checkweigh upper limit High: xxx.xxx g A blank line printed <CR><LF> only.

Any of these can be printed on any of the 15 lines available. Not all items need to be used and any one can be used more than once (see section 13.3).

The data for each form will be preceded by a start-of-header <SOH> character (01) and terminated with an end-of-transmission <EOT> character (04). These characters will be ignored by a serial printer but will allow a computer program which reads the data to distinguish between this block report format and the single-line output format described above.

STANDARD FORMAT

The balance will print the following data as the standard form. The standard form cannot be changed. The format of the custom forms #1 and #2 will be the same as the standard form until modified by the user.

Line 1 Date Line 2 Time Line 3 Blank line Line 4 ID number Line 5 Blank line Line 6 Result Line 7 Blank line Line 8 Blank line

This will result in a printout that looks like:

Date: 23/09/04 Time: 15:45:27

ID No: 123456

Net: 123.4567 g

*NOTE: The format of the results line will change depending on the mode in

which the balance is operating, e.g.

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Normal weighing, Check weighing, Animal weighing: “123.4567 g” Parts Counting: “1234 pcs” Percent weighing: “12.345 %”

INPUT COMMANDS USING REMOTE KEYS

The balance can be controlled with the following commands sent using remote keys such as from a PC. The commands must be sent in upper case letters, i.e. “KT” not “kt”. Press the Enter key of the PC after each command (the action of Carriage Return is denoted as <CR> as shown below).

Basic Input Commands:

!KT<CR>

!KS<CR> Enters the Setup section. This is the same as pressing the [Setup] key

!KP<CR>

!KM<CR> Enters the Modes section. This is the same as pressing the [Mode] key

!KC<CR> Enters the Calibration section. This is the same as pressing the [Cal] key

!KU<CR> Enters the Unit selection section. This is the same as pressing the [Unit]

Tares the balance to display the net weight. This is the same as pressing the [Zero / Tare] key when the balance is in the normal weighing mode.

when the balance is in the normal weighing mode.

Once entered the Setup section, the balance can be controlled remotely using the Input Commands (as mentioned in this table) which will perform the same key functions as described in section 13.0.

Transmits data over RS-232 interface. This is the same as pressing the [Print] key when the balance is in the normal weighing mode.

when the balance is in the normal weighing mode.

key when the balance is in the normal weighing mode.

Invalid Input Command:

If an invalid command is received, then the command is returned as follows-

Invalid Command Message returned Remarks

!NT<CR> !EU<CR> Command character is not ‘K’ !KK<CR> !EK<CR> Key character is not ‘T’, ‘S’, ‘P’, ‘M’, ‘C’

or ‘U’

!KT-<CR> !EF<CR> Command format error, <CR> is not

the fourth character KT<CR> or !KT -

No reply Either ‘!’ or <CR> is missing in the

command string

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12.0 ERROR CHECKING

During weighing the balance is constantly checking to see if the balance is operating within limited parameters. During weighing the errors likely to occur are: A/D counts below lowest allowed value A/D counts above highest allowed value A/D not operating Maximum capacity exceeded

Other errors may be detected during special functions or operations. These will be described in the section that applies.

Error messages and the reason for them are:

Concerning A/D counts

ERROR ADc UL A/D counts below a limit

ERROR ADc OL A/D counts above a preset limit

Concerning calibration

Calibration could not be completed

ERROR StAb

ERROR LO or ERROR HI

Concerning weighing

ERROR LO Weight display is below zero by >4%max

ERROR LOAd Weight is above maximum plus 90d

because the results were not stable

Calibration constant not within 20% of old calibration constant

13.0 SUPERVISOR MENUS

Pressing the [Setup] key while in normal weighing gives access to the menus.

• When [Setup] is pressed and passcodes are not enabled the display will show the Supervisor menus. If passcodes are enabled,

the balance will ask for it by displaying “PASSCODE 0”

• If a wrong code is entered an “ERROR CODE” message will flash and the balance will return to weighing mode

• If the passcode has been enabled and entered, the balance will allow the operator to access the Supervisor’s menus by which the user can

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enable/disable weighing units or modes, set balance parameters for the conditions, set time and date, set parameters for the RS-232 interface, calibration parameters and security parameters

•

The display will show the first menu item “UNITS”. The [Up] and [Down] keys will cycle through the main menu item, pressing [Enter] key will enter the sub-menu or options can be set. Press [Mode] to come out of a sub-menu or [Esc] to return to normal weighing

13.1 ENABLE WEIGHING UNITS

• When “UNITS” is displayed, press [Enter]. The display will show the symbol for the first unit, e.g. carats, ct, together with its enable state “OFF” or “On”. The user can then enable or disable the carats unit by using [Up] or [Down]. Pressing [Enter] will confirm the setting and will advance to the next weighing unit. Repeat for each weighing unit in turn. Gram is always enabled

• Press [Mode] to advance to setting of the next menu or press [Esc] to return to normal weighing

13.2 ENABLE WEIGHING MODES

Same steps are followed to enable or disable the weighing modes.

• Press [Enter] when “MODES” is displayed. The display will show the first mode i.e., Parts Counting (“PARTS”) together with its enabled state “OFF” or “On”. The user can enable or disable the parts counting mode by using [Up] or [Down]. Pressing [Enter] will confirm the setting and will advance to the next weighing mode. Repeat for each mode in turn

• Press [Mode] to advance to setting of the next menu or press [Esc] to return to normal weighing

13.3 ENABLE SERIAL INTERFACE PARAMETERS

The parameters affecting the serial setup are set in a similar manner to the other parameters.

Press [Enter] to enter the sub-menu.

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The parameters that can be set are:

ENABLE The serial port can be set to On or OFF

BAUD RATE

Set the Baud Rate to 4800, 9600, 19200 or 38400, the default rate being 4800

PARITY

Set the Parity to NONE, EVEN or ODD

STABLE To print when stable (On) or regardless of stability (OFF)

CONTINUOUS Set the RS-232 to send data continuously to On or OFF

PERIODIC Set the RS-232 to send data periodically (set in seconds)

to On or OFF. If On is selected, the value can be changed between 1 and 999 seconds, using [Up] and [Down]

FORMAT

To send data as a single line of data, using the standard format or using a customer designed format (FORM 1 or FORM 2).

Format of custom forms #1 and #2

If FORM1 or FORM2 is selected, it can be changed by the user using a selection of available data. By default the 2 forms are the same as the standard form unless changed by the user as below.

When FORM 1 or FORM 2 is selected the user can set the information to be printed on each line of the form. Pressing the [Up] or [Down] keys will cycle through the options available. The options are:

INST ID Instrument ID number SER No Serial Number TIME Time DATE Date NET Net Weight (Gross weight – Tare Weight) GROSS Gross Weight TARE Tare Weight UNIT Unit weight in parts counting mode COUNT Number of items in parts counting mode REF 100% weight in percent weighing mode PERCENT Percentage of reference weight in percent weighing LO LIMIT Low Limit when check weighing

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USA (mm/dd/yy)

HI LIM High Limit when check weighing Cr Lf Inserts a blank line END Signifies the end of the report

When END is entered the display returns to the RS-232 Submenu

Enter the data to be printed on the first line by pressing the [Up] or [Down] key to cycle through the options. If the current information is OK then press the [Setup]/Enter key to move to the next line.

e.g. “LINE No1” “DATE” - prints date

Select a code for one of the preset data formats as detailed above.

The next line shows: “LINE NO 2” “TIME” - prints time Only one item can be entered per line.

Continue until the formatting of the form is complete. There are 15 lines of possible data. After the 15th line has been set or “END” has been selected, the balance will return to the RS-232 Sub-menu.

Press [Mode] to advance to setting of the next menu or press [Esc] to return to normal weighing.

13.4 SETUP PARAMETERS

The user parameters that control the balance are shown under the SETUP. When “SETUP” is displayed, press the [Setup]/Enter key. The options for each parameter can be scrolled through by using the [Up] or [Down] key.

LANGUAGE

English French German Spanish

TIME Set Time using the numeric entry method

(see section 7.1)

DATE DATE FORM EUROPE (dd/mm/yy)

Set Date using the numeric entry method (see section 7.1)

INST ID Enter a user number to identify this

balance

BUZZER

On= Enable OFF= Disable

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BACKLIGHT

On OFF AUTO (default)

POWER DOWN

Set the time after which the unit will go into Stand-by power settings, On=Enable, OFF=Disable, If set to On- the options are 1 to 9 minutes

FILTER

Set a value for the amount of filtering to be done ranging from 1 to 10. A larger number means more filtering and a slower response.

STABILITY

Set a value to be used to determine balance stability, set a value of 1, 2, 5 or 10d. A larger number corresponds to a larger stable zone. Default is 5

AUTO ZERO Can be set to On or OFF to enable the

auto-zero function. If set to On- select from 1, 2 or 5d

The sub-menu is entered by pressing [Enter]-

• Use the [Up] and [Down] keys to increase or decrease the value. Press [Enter] to accept the setting and advance to the next item in the menu

• Press [Mode] to advance to setting of the next parameter or [Esc] to return to normal weighing

13.5 CALIBRATION SETUP

This menu allows the user to set the calibration parameters.

• Press [Enter] when “CAL SETUP” is displayed to select the calibration parameters

• The options for each parameter can be scrolled through by using the [Up] or [Down] key

ENABLE NO =operator calibration is disabled

YES=operator calibration is enabled

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CAL REPORT On = Enabled. Prints out Calibration report after

successful calibration OFF = Disabled

TIME CAL On = Enabled. Select time from 1 to 24 hours.

Default setting is 4 hours OFF = Disabled

TEMP CAL On = Enabled. If set to On, set the temperature

variation from 0.2 to 4°C OFF = Disabled

INT CAL

YES = Use Internal calibration mass as displayed or adjust for accurate Internal Calibration (see section

13.5.1) NO = Use external calibration mass

• Press [Mode] to advance to setting of the next menu which is “PASSCODES” or [Esc] to return to normal weighing.

13.5.1 INTERNAL CALIBRATION MASS ADJUSTMENT

Balance model Internal Calibration mass (approx.)

PW 124 100g PW 184 100g

PW 214 100g

PW 254 100g

NOTE: The value of the internal mass is not an exact number, such as 100g. It must be set by comparing with an external mass. The exact value can be set, provided this feature is enabled at the factory.

PROCEDURE

• Make sure the balance is level and has been ON for 4 hours or more at a stable temperature.

• Calibrate the balance twice. This helps to reduce any stresses in the mechanics.

• To verify the accuracy of this internal calibration, place an external mass approximately equal to the same internal calibration mass. Record the result.

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• When “INT CAL” is displayed select “YES” by pressing the [Enter] key. The value of the internal mass set in the factory will be displayed.

• A new internal value can then be reset to display the external mass value correctly. If the reading for the external mass is greater than the actual value of the mass then reduce the internal mass value by the difference. Enter this reduced value when prompted by the display.

For example, if the internal mass previously set is 100.054g and the display reads 100.050g when using an external mass of 100g, then reduce the internal mass value by 0.050g. Enter the new revised value of 100.004 (in place of 100.054g) when prompted. The adjustment can be done for up to ±100mg.

• Repeat the calibration and check the value of the external mass again.

• Repeat this procedure until the value displayed is correct for the mass

used.

• Press [Esc] to return to normal weighing.

13.6 PASSCODES

To enable the security features in this balance it is necessary to set passcodes. There are 2 passcodes called Operator Passcode and Supervisor Passcode. The Operator Passcode allows an authorised user to operate the basic weighing functions of the balance but will not allow access to the Supervisor Menus if the Supervisor Passcode has been set.

To change or disable a Passcode it will be necessary to enter the current passcode.

Press [Enter] when “PASSCODES” is displayed to enter this section.

OPERATOR Enter the current passcode (OLD) first then enter a new

passcode if desired. A passcode set to zero will disable the security feature and allow unlimited access.

SUPERVISOR First enter the current passcode (OLD) and then enter a

new passcode, if desired. A passcode set to zero will disable the security feature and allow unlimited access.

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13.6.1 Forgotten Passcodes

Keep a record of the passcode to ensure you can access this section again. If however you have forgotten your passcode you can still gain access by entering a universal code.

If you have forgotten the current passcode a code of “15” will always allow you to enter the Supervisor area.

Using the Supervisor menus go to the PASSCODE section and reset the operator or Supervisor passcode using the “15” code as the old number when asked.

14.0 PERIPHERALS

The peripherals that can be used with the balance are the following:

14.1 DENSITY DETERMINATION KIT

The Density Determination Kit includes everything needed to carry out precise and repeatable measurement. The kit allows a sample to be weighed in air and then a liquid to determine the density of the sample. It also allows a glass sinker of known volume to be weighed in air or in a liquid, to determine the density of the liquid.

14.2 ANTI-VIBRATION TABLE

The anti-vibration table is a support for laboratory balances that isolate the balance from vibration through the floor. The table has a granite surface for the balance with a separate table top surrounding the balance.

14.3 ADAM PRINTERS

The Adam printer is a compact thermal printer which is ideal for use with laboratory balances. There are 3 versions, one to print data as it is received from the balance, second one prints data and time along with weighing data if enabled by the balance and the other one has the ability to perform statistical analysis of the weighing results.

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15.0 SAFETY AND MAINTENANCE

CAUTION

Use the AC adapter designed by the manufacturer for the balance. Other adapters may cause damage to the balance.

Avoid overloading or dropping material onto the platform as that could damage the balance.

Do not spill liquids on the balance as it is not water-resistant. Liquids may damage the case and if it gets inside the balance it may cause damage to the electronics.

Material that has a static electric charge could influence the weighing. Discharge the static electricity of the samples, if possible. Another solution to the problem is to wipe both sides of the pan and the top of the case with an anti-static agent.

16.0 TROUBLE-SHOOTING

Service of a balance will generally be necessary when the balance does not perform as expected. The balances are not user-serviceable. For Service Information, see section 18.0 and contact Adam equipment or your supplier.

Problems usually fall into one of the following categories:

User Problems:

The user is asking the balance for something it cannot do or is confused by the modes and functions of a balance. It is also possible the user has set a parameter that has affected the balance operation. Resetting the parameter to a normal value will restore operation.

Mechanical Problems

The balances consist of complicated and fragile mechanical devices. They can be damaged by placing a weight on it which is too high for the balance or by dropping the balance or occasionally shipping it without taking care. The most fragile parts are the flexures. Dust, dirt, spills and other foreign objects in the balance can also cause problems.

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Electronic Problems:

These are the rarest of the problems affecting balances. If an electronic problem is suspected make sure the mechanical problems that can cause similar symptoms have been eliminated before attempting electronic repairs. With the exception of cables most electronic repairs are solved by board replacement.

The table that follows is a guide of common problems and their solutions. Note that many problems may have multiple solutions and there may be problems found that are not listed in the table. For Service Information, contact Adam Equipment or your supplier.

BALANCE DOES NOT FUNCTION

Problems Possible causes Suggestions

The balance is dead when power is applied

The display does not turn on but the calibration motor moves when power is applied

The display stays on the initial test screen when power is applied. Calibration weight motor is on.

BALANCE WORKS BUT IS NOT STABLE

Balance is unstable by a few divisions

Power supply failure Check adapter is working

Power is getting to balance, display is not working

Unstable balance

Balance not working correct

Power supply

Noise or vibration from environment

Friction in mechanics

Check adapter is correct for the balance

Normal adapter is 15VDC, 800mA.

*Power supply circuit board failure

*Short circuit on any circuit board

*Display cables may be faulty

*Display module failure

*Check if balance is stable by using service menu and view A/D values

Put draught shield over pan

Check power supplies

Check the balance is positioned correctly to avoid vibration, wind or air movement, it is on a solid table, It is not near sources of heat or cool air,

Check balance with weights if problem occurs when sample is used. Static electricity on the samples can cause drifting and instability.

Check the area around the weighing pan for hair, dust, obstructions under the pan,

*A complete inspection of the mechanics to look for sources of friction may be needed.

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Balance is very unstable and does not weigh correctly

Mechanical problems

Balance programming

Electronic problems

*A complete inspection of the mechanics to look for sources of friction.

*Verify the A/D is also unstable. If the A/D is OK then suspect the programming of the balance. Reset parameters, check temperature compensation, and redo the calibration.

Some electronic problems can also cause this. But all mechanical problems must be resolved first.

BALANCE IS NOT ACCURATE

You must have accurate and trusted weights to test a balance. If you suspect that the balance is not accurate then you must know your weights are accurate. A balance calibrated using a bag of flour is not accurate even if it works OK otherwise.

Balance is not accurate Repeatability

Verify the balance shows the same value when the same mass is placed on the centre of the pan for a few tests.

Eccentric loading

Verify the balance shows the same reading (within a tolerance depending upon the model) when a mass is placed

Linearity

at positions around the pan.

Verify the balance is acceptable throughout the weighing range. The balance must give acceptable readings from low weights up to the capacity.

Poor Repeatability Usually a mechanical

problem.

Inspect the area around the pan for hair, dust or other obstructions,

*Inspection of the mechanics may be needed for any possible problems.

Poor Eccentric loading A mechanical problem Inspect the area around the pan for hair,

dust or other obstructions,

*Inspection of the mechanics may be needed for any possible problems.

*Readjusting of the Eccentric loading is recommended.

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Poor Linearity Usually a mechanical

problem

Electronic Problems

Nova-Tech PW Series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual