Salter Brecknell 335 User manual

Model 335 Postal Scale

User Manual

1.1 Introduction

Designed for use within stable environments where fluctuation of

temperature, humidity and vibration are limited. The scale features a

weight hold function allowing you to view the weight of an item that is too

large and obstructs the weight display. The 335 also includes a units

switching function allowing you to weigh items in lb/oz, kg, or g.

Use the flip tray to weigh large envelopes or hold tubes/packages in place

on the weight tray.

The Model 335 includes a blue backlit display. The display will activate

upon power up and when the scale is in use for weighing. To save battery

life the backlight will turn off after seven seconds of no use.

The Model 335 Postal Scale,

shown at right, is an

affordable solution for many

applications. Perfect for use

in the office or home to weigh

letters and small packages.

The 335 includes a USB

interface that will provide

power and communication

with your computer and 3rd

party USPS software.

1.2 Unpacking the scale

Check packaging and scale for any obvious evidence of damage.

Immediately report shipping damage to Salter Brecknell.

Remove contents from packaging, your product should include:

1. Model 335 scale

2. One USB cable

If you are missing an item please contact you Salter Brecknell dealer for

immediate replacement at no charge, shipped via UPS ground.

1.3 Installing the scale

1. Mount the scale on a stable, level surface that is free from air

currents, rapid temperature changes and vibration. These may

affect the weighing accuracy or the stability of the displayed weight.

2. Carefully install, do not force, the weight platter on top of the

mounting posts. Make sure the weight platter does not touch any

adjacent surfaces.

3. Be sure all feet are in contact with the counter.

4. Plug the USB cable into the back of the scale and into a USB port

on a computer to supply power to the scale. You may use a 9v

battery, not supplied, to power the scale. See Installing or

Changing the Battery on page 3

5. Turn the unit on for five minutes, to allow the electronics and load

cell to warm up to room temperature.

6. Place a known weight on the scale to test the weighing accuracy.

Your scale should display the correct weight.

Troubleshooting Tip!

If your scale is not weighing accurately upon

installation, calibrate the scale. See Calibration

on page 9.

1.4 Operating Instructions

1.4.1 Installing or Changing the Battery

Your Model 335 bench scale can operate on one 9 volt battery. The

expected life of the battery is 60 hours of normal use.

If Lo. B is displayed, this indicates the batteries are low. After this appears,

the scale will turn off in approximately one minute.

To change the battery

1. Remove the battery cover on the bottom of the scale, shown in

Figure 1.1.

Figure 1.1 Battery changing

2. Remove the old battery.

3. Insert the new battery, making sure you align the battery into the

correct positive (+) and negative (-) orientation.

4. Replace the battery cover.

1.4.2 Annunciators and Key Functions

The 335 has a series of arrow annunciators along the bottom of the display

that point at labels to show you the current unit of measure, if the unit is in

Hold mode, if there is an active tare and if the scale is at zero weight.

Below are descriptions of the three key functions.

Key name Function

Hold / Unit Quick press this key to activate Hold mode. An arrow above Hold

will flash until weight is stable, then a beep sounds and the arrow

will remain lit. Place your item on the scale, allow two seconds for a

stable weight reading, Once you remove the item the weight will be

held in the display until you quick press the key again.

Press and hold for 3 seconds to switch to the next unit of measure

or continually hold to cycle through the units of measure (kg, g, lb,

oz). An icon above the kg, g, lb, oz label will light.

Zero / ON / OFF With the scale turned off and no weight on the scale, quickly press

this key to power On the scale. On power up the scale can zero up

to 10% of capacity.

To turn off, press and hold for more than 3 seconds.

To Zero the scale, press and hold this key for less than 2 seconds

to return the scale to zero weight. You can zero of up to 2% of

capacity.

Tare Quick press this key to perform a Tare function. An arrow above

Tare on the display will light. Press this key to remove the weight of

a container from the display and return the scale to zero weight.

Once you remove your tare container, press this key again to

return the scale to normal weighing.

1.4.3 Standard Weighing

Follow these steps to perform standard weighing:

1. Press the Zero / ON / OFF button to turn the scale on…

The scale beeps and performs a test sequence. If

everything is OK, the display will show zero weight and the

scale is ready for use.

2. Press the Zero / ON / OFF key if the display is not showing zero

weight.

3. Place your item on the weight platter…

The weight is displayed. It may take up to 2 seconds for the

weight to stabilize.

1.4.4 Changing Unit of Measure

Press and hold the Hold / Unit key until you hear a beep and the

annunciator arrow moves to the next unit of measure. If you continue to

hold down the Hold / Unit key, the annunciator will continue to move to the

next unit of measure every 2-3 seconds (lb/oz, kg, g). Release the key

when the desired unit is highlighted.

The scale will retain the unit of measure selected, even after power off,

until you change the unit of measure.

1.4.5 Tare Weighing

If your are using a container to weigh items and want to see the net weight,

place the container on the scale and quick press the Tare key for less than

2 seconds. The display should show 0.000 weight, and an arrow will light

above Tare in the display window, indicating the tare feature is active.

Place your items in the container, to determine the net weight.

Upon completion of your tare weighing, after

removing your container, the display will show a

negative weight. Quick press the Tare key for

less than 2 seconds to return the scale to zero

gross weight.

1.4.6 Weight Hold Function

The weight hold feature allows you to weigh letters or packages larger than

the weight platter that would cause the size of the item to block the weight

display window.

The weight hold features allow you to lock a stable weight on the display

after removing your item.

1. With the scale on and at zero weight, quick press the Hold / Unit

key…

An arrow will light above HOLD to indicate weight hold is in

effect.

2. Place your item on the scale, allow two seconds for the weight to

stabilize…

A beep will indicate the weight is stable. The weight of the

item will be held on the display.

3. Remove your item and read the weight on the display.

4. Quick press the Hold / Unit key again to return the scale to normal

weighing mode.

1.4.7 Auto Power-Off

To converse battery life and electricity, the Model 335 scale will

automatically power off after 5 minutes of no use or no change in weight.

If connected to your USB port, you should turn off this feature. Press and

hold the Tare key for 5 seconds, AU.oFF is displayed. The auto power off

feature has now been turned off.

To turn the Auto Power Off feature back on, press and hold the TARE key

for 5 seconds, AU.on is displayed. The auto power off feature has now

been turned back on.

1.4.8 USB Interface

The Model 335 postal scale includes a USB virtual com port interface that

is compatible with Windows 98, XP and Vista.

Download and install the 335 USB driver from www.salterbrecknell.com.

See the Downloads page.

There is an Active X program on the Salter Brecknell website if you want

to do your own customized scale interface. Check the Downloads page

for the 335 Active X program.

There is a United States Postal Service (USPS) program available for use

with this scale. See the included card for complete information.

After installing the USB driver, the PC will recognize the new hardware

when the scale is connected and powered up. Using your Windows Control

Panel, find and make note of the COM port setting for USB-SERIAL

CH340.

Configure your com port for 2400 Baud, 8 data bits, no parity, 2 stop bits.

Make sure you do not use the DTR and CTR.

1.4.9 Model 335 Interface Format

The Model 335 continuously sends the following format 3 times per

second.

Definition of formats:

<STX> = Start of Text Character (02 hex)

X= Status Characters from scale

#= Status characters from scale

<CR> = Carriage Return character (hex 0DH)

1.5 Cleaning and Care

Use a damp cloth with mild detergent to clean your scale.

Handle the scale with care. Precision scales include sensitive load cells.

Dropping the unit or placing weights on the scale that are heavier then the

rated capacity of your scale may cause damage to the load cell.

1.6 Troubleshooting

Symptom Possible Cause Remedy

Cannot turn on Batteries are low

Incorrectly installed battery

Replace batteries, check

polarity

Poor weighing accuracy Improper calibration

Unstable environment

Scale was not zeroed prior to

use

Tare function is active

Displaying incorrect weight

Perform calibration

Move scale to stable

location

Press the ZERO key to

zero the scale prior to

use

Press Tare key to

remove tare weight held

in memory

Ensure correct unit of

measure is active

CAL. Er displayed Unstable environment

Incorrect calibration weight

used

Move scale to suitable

location

Use correct calibration

weight

Err2 displayed Overload Zero Error

Normal Calibration condition

Load cell is damaged

Excess weight applied to

scale upon zero or power

on, remove weight

Remove weight

Err1 displayed Under load Zero Error

Verify weight platter is

installed correctly, power

off then on

Perform Calibration

_ _ _ _ _ displayed Overload Condition Excess weight applied to

scale, remove weight

1.7 Calibration

From time to time, all scales may require calibration to provide accurate

weighing. When calibrating your scale, you are teaching the scale a zero

reference point and a known accurate weight.

The MODEL 335 allows you to calibrate the scale using lb or kg weights.

1.7.1 Calibrating your scale using LB weights

1. Make sure there is no weight on the scale, and the scale is off.

2. Press and hold the Tare key, then press the Hold / Unit and Zero

/ ON / OFF key until the display shows 15.00 and release all the

keys.

3. Press the Hold / Unit key to calibrate the scale using a LB

weight…

35,0.0 is displayed. This is the amount of test weight you

need to calibrate the scale.

4. Press the Tare key to accept…

The scale will display the internal counts 9000—11000.

5. Press the Tare key to accept and to perform the zero calibration…

0,0.0 will be displayed briefly, then the internal counts will be

displayed again.

6. Place your 35 lb weight on the scale and press the Tare key to

perform calibration…

35,0.0 is displayed briefly, then the scale returns to normal

weighing mode and Err 2 is displayed.

7. Remove the weight from the scale and press the Zero / ON / OFF

key…

The scale will show 0,0.0 weight.

You must close any Windows program used

with the Model 335 before attempting to

calibrate the scale.

1.7.2 Calibrating your scale using KG weights

1. Make sure there is no weight on the scale, and the scale is off.

2. Press and hold the Tare key, then press the Hold / Unit and Zero

/ ON / OFF key until the display shows 15.00 and release all the

keys.

3. Press the Tare key to accept…

The scale will display the internal counts 9000—11000.

4. Press the Tare key to accept and to perform the zero calibration…

0.00 will be displayed briefly, then the internal counts will be

displayed again.

5. Place your 15 kg weight on the scale and press the Tare key to

perform calibration…

15.00 is displayed briefly, then the scale returns to normal

weighing mode and Err 2 is displayed.

6. Remove the weight from the scale and press the Zero / ON / OFF

key…

The scale will show 0.00 weight.

If CAL.Er appears, this indicates an error in

calibration. Repeat steps 1-7. If CAL.Er

continues to appear you may have a damaged

load cell or electronics.

WARNING! Calibrating your scale with

inaccurate or the incorrect weights as

defined in Stabilization Up to 2 seconds to

stable weight reading on page 11 will cause

your scale to weigh incorrectly.

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