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Contents
1. About this edition of user instructions ....................................................................... 3
2. Safety precautions ................................................................................................... 4
3. General information .................................................................................................. 6
4. Getting started .......................................................................................................... 7
5. Operation ................................................................................................................. 8
6. Calibration ................................................................................................................ 9
7. Specifications ......................................................................................................... 11
8. Care and maintenance ........................................................................................... 12
9. Warranty ................................................................................................................. 13
10. EU Declaration of conformity .................................................................................. 14
1. About this edition of user instructions
The current edition of the user manual applies to the following models and versions
of densitometers, suspension turbidity detectors:
DEN-1 version V.2AW
DEN-1B version V.2AW
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2. Safety precautions
Caution! Make sure you have fully read and understood the present Manual
before using the equipment. Please pay special attention to sections
marked by this symbol.
GENERAL SAFETY
The protection provided can be ineffective if the operation of the appliance does not
comply with the manufacturer's requirements.
Save the unit from shocks and falling.
Store and transport the unit at ambient temperatures between -20°C and +60°C and
maximum relative humidity of 80%.
After transportation or storage and before connecting it to the electric circuit, keep the
unit under room temperature for 2-3 hrs.
Use only original parts and accessories, provided by manufacturer for this product.
Before using any cleaning or decontamination methods except those recommended
by the manufacturer, check with the manufacturer that the proposed method will not
damage the equipment.
Do not make modifications in design of the unit.
ELECTRICAL SAFETY
Connect only to the mains with voltage corresponding to that on the serial number
label.
Use only the external power supply provided with this product.
Ensure that the power plug is easily accessible during use.
Disconnect the unit from the mains before moving.
If liquid penetrates into the unit, disconnect it from the mains and have it checked by
a repair and maintenance technician.
Do not operate the unit in premises where condensation can form. Operating
conditions of the unit are defined in the Specifications section.
Batteries (only for model DEN-1B)
Warning! Risk of fire and explosion!
Use only AA size batteries, rechargeable or non-rechargeable.
Replace all used batteries in the unit at the same time. Insert batteries properly, with
the plus (+) and minus (–) terminals aligned correctly. In case of doubt, turn off the
unit immediately and check the polarity.
Keep all batteries in a safe place away from children and pets.
Where possible, recycle the batteries. Contact local government for information about
the disposal options in the area.
Remove batteries from the unit if it will not be used for several months to avoid battery
leakage.
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Do not mix old and new batteries, batteries of different brands, or batteries of different
types (e.g. zinc chloride and alkaline batteries) in the same unit as this may cause
the batteries to leak.
Do not attempt to recharge non-rechargeable batteries. This can cause batteries to
overheat or leak.
Do not place batteries in a refrigerator. This will not ‘recharge’, increase storage life,
or increase batteries’ power.
Do not exceed storage temperature, it reduces battery performance and may also
lead to leakage.
Do not remove the battery label, or attempt to take the battery apart, or dispose of in
a fire as this may lead to rupture and/or chemical burns.
DURING OPERATION
Do not operate the unit in environments with aggressive or explosive chemical
mixtures. Please contact manufacturer for possible operation of the unit in specific
atmospheres.
Do not operate the unit if it is faulty or has been installed incorrectly.
Do not use outside laboratory rooms.
Use Select and Install buttons only for calibration of the unit. Pressing the buttons
can cause loss of calibration.
BIOLOGICAL SAFETY
It is the user’s responsibility to carry out appropriate decontamination if hazardous
material is spilt on or penetrates into the equipment.
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3. General information
DEN-1 & DEN-1B densitometers are designed for solution turbidity measurement in
the range of 0.3 - 5.0 McFarland units or 1x108 cells/ml - 15x108 cells/ml (DEN-1B - 0.0 - 6.0
McFarland units or 0 cells/ml - 18x108 cells/ml). DEN-1 & DEN-1B are capable of measuring
solution turbidity in a wider range, up to 15.0 McFarland units, however, it is necessary to
remember that in this case the measurement error values increase.
DEN-1 & DEN-1B densitometers are used as a sample preparation devices for 1)
determining concentration of cells in the fermentation process, 2) detection of susceptibility
of microorganisms against antibiotics, 3) identification of microorganisms with various test
systems, 4) measuring optical density at fixed wavelength and 5) quantitative evaluation of
concentration of dyed solutions that absorb green light.
The operation principle is based on optical density measurement with digital result
representation in McFarland units.
The unit is calibrated at the factory and saves calibration data when being switched
off. However, in can be recalibrated by multiple points in 0.5 - 5.0 McF range (for DEN-1B,
0.0 - 6.0 McF) if necessary. We recommend to use Biosan standards to ensure full reliability,
but it is acceptable to use other commercial as well as self prepared standards (e.g. BaSO4).
Table 1. Interpretation of McFarland Standard results into corresponding numeric values of
approximate bacterial suspension concentration and their optical density at 550 nm.
McFarland
standard
Composition
Interpretation
Concentration of BaSO4
Approximate bacterial
concentration1
Theoretical optical
density2 at 550 nm
0.5
2.40 x 10-5 mol/L
1.5 x 108 cells/ml
0.125
1
4.80 x 10-5 mol/L
3 x 108 cells/ml
0.25
2
9.60 x 10-5 mol/L
6 x 108 cells/ml
0.50
3
1.44 x 10-4 mol/L
9 x 108 cells/ml
0.75
4
1.92 x 10-4 mol/L
12 x 108 cells/ml
1.00
5
2.40 x 10-4 mol/L
15 x 108 cells/ml
1.25
6
2.88 x 10-4 mol/L
18 x 108 cells/ml
1.50
1
Bacterial concentration depends on microorganism size. The numbers represent an average value
valid for bacteria. For yeasts, which are larger in size, these numbers should be divided by about 30.
2
Values correspond to optical densities of bacterial suspensions. The BaSO4 solutions optical density
values differ, because the particle size and form differ from those of bacteria and light is diffracted
differently
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4. Getting started
4.1. Unpacking. Remove packing materials carefully and retain them for future shipment
or storage of the unit. Examine the unit carefully for any damage incurred during
transit. The warranty does not cover in-transit damage. Warranty covers only the units
transported in the original package.
4.2. Complete set. Package contents:
4.2.1. Standard set
- DEN-1 / DEN-1B Densitometer, suspension turbidity detector ........................ 1 pce.
- A-16 adapter for Ø16 mm tubes ....................................................................... 1 pce.
- AA batteries (for DEN-1B only) ........................................................................ 3 pcs.
- External power supply ..................................................................................... 1 pce.
- Operating manual, declaration of conformity .................................................. 1 copy
4.2.2. Optional accessories:
- CKG16-4 calibration kit for Ø16 mm glass tubes ...................................... on request
- CKG16-6 calibration kit for Ø16 mm glass tubes ...................................... on request
- CKG18-4 calibration kit for Ø18 mm glass tubes ...................................... on request
- CKG18-6 calibration kit for Ø18 mm glass tubes ...................................... on request
Figure 1. Figure 2.
4.3. Setup.
- (for DEN-1B) Battery installation. Insert a flat sharp pin in the small socket (fig. 1/1)
on the underside and open the battery compartment. Insert batteries as shown on
the scheme inside and close the compartment.
- Place the unit on horizontal even working surface.
- Plug the external power supply into the socket at the rear side of the unit.
Note. For DEN-1B, connecting external power supply is optional when the
batteries are in use.
- Remove the protective film from the display.
4.4. Factory calibration. The device is pre-calibrated at the factory for operation with the
glass tubes 16 mm in external diameter (see the label on the bottom side of the unit)
at temperature range from +15°C to +25°C and saves calibration data when being
switched off.
Attention! Recalibrate the unit before using the tubes that are different from
factory calibrated (e.g. with different outer diameter, bottom shape or
different material such as plastic). See the Calibration section of this
manual.
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5. Operation
Recommendations during operation
Remove the tube with the solution from the socket before switching the unit on or off.
We recommended keeping the unit switched on for 15 minutes before starting the
operation in order to stabilize it in the working mode.
If flat-bottomed tubes are used, the solution level should be higher than 7 mm from a tube
bottom; if round-bottomed tubes are used - higher than 12 mm from a tube bottom.
Check if the A-16 adapter is in the socket (fig. 3/1). The device is calibrated for
operation with the glass tubes 16 mm in external diameter. To use different tubes,
recalibrate the unit, see the Calibration section of the manual.
Figure 3. Front view
5.1. Connect the external power supply to electric circuit. Switch on the unit using the
Power switch (fig. 2/1) on the rear panel.
Note. For DEN-1B, connecting external power supply is optional when the
batteries are in use.
5.2. The following indication may be shown on the display (fig. 3/2):
0.0 (DEN-1) or 0.00 (DEN-1B) - the unit is calibrated and ready for operation.
LO BAT (DEN-1B) - low batteries, replace the batteries as described in 4.3 or connect
the external power supply.
Note. The display of DEN-1B switches off if the socket is empty for longer
that one minute. Press the On key (fig. 3/3) to activate the unit.
5.3. Shake the tube with the solution. It is recommended to use a vortex for shaking, e.g.
Biosan V-1 plus. Insert the tube into the socket of densitometer (fig. 3/1). The
McFarland value for the solution will be shown on the display (fig. 3/2).
Attention! Recalibrate the unit before using the tubes that are different from
factory calibrated (e.g. with different outer diameter, bottom shape or
different material such as plastic). See the Calibration section of this
manual.
5.4. To ensure measurement precision, check that the external diameter of tubes is 16
mm (with A-16 adapter) or 18 mm.
5.5. After finishing the operation switch OFF the unit using the Power switch (position O).
If the external power supply is used, disconnect it from electric circuit.
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6. Calibration
6.1. The device is pre-calibrated at the factory for operation with the glass tubes 16 mm
in external diameter (see the label on the bottom side of the unit) at temperature
range from +15°C to +25°C and saves calibration data when being switched off.
6.2. Before using the standards. The standard suspensions must be sufficiently
resuspended. To do this, proceed as follows:
- Mix adequately at the highest RPM setting of your vortex mixer device, i.e. Biosan
V-1 plus.
- Allow the tubes to stand for 2 to 5 minutes to allow all air bubbles to rise.
- Invert the tubes carefully before comparison. Avoid bubble formation during
operation.
6.3. Perform calibration from lower to higher calibration value. Use at least 2 points for
calibration. Different calibration points are available:
For DEN-1, calibration points are 0.5, 1.0, 2.0, 3.0, 4.0 and 5.0.
For DEN-1B, calibration points are 0.00, 0.50, 1.00, 2.00, 3.00, 4.00, 5.00 and 6.00.
6.4. Connect the external power supply to electric circuit. Switch on the unit using the
Power switch (fig. 2/1) on the rear panel.
Note. For DEN-1B, connecting external power supply is optional when the
batteries are in use.
Attention! Make sure that the tube socket is empty.
6.5. Press the Select button (fig. 2/3) on the rear of the unit.
Note. Use a thin pin of maximum diameter of 2 mm for pressing the Select
and Install buttons.
6.6. To calibrate DEN-1B model, it is necessary to set values for an empty socket -.-- and
transparent standard 0.00.
6.6.1. Empty socket. Display shows -.-- indication. Press Install button (fig. 2/4) to save
empty socket value. Display shows next required calibration value.
6.6.2. Transparent standard. Display shows 0.00 indication. Insert standard for 0.00 value
into the socket (fig. 3/1) of the unit. If the standard for 0.00 value is not available, fill
the tube (of the kind that is used for operations) with distilled water. Use the tube as
the 0.00 value standard. Press Install button to save empty socket value. Display
shows next required calibration value.
Note! Calibrate the unit using as many points as possible to obtain precise
results. Minimum requirement are 2 points closest to the working
range limits (e.g. 0.00 and 6.00 for operation in 0.00 - 6.00 McF
range).
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6.7. Common calibration rules. Display shows indication of necessary calibration value.
Insert the necessary standard into the socket (fig. 3/1) of the unit and press the Install
button to save the value for current standard.
Note. If pressing the Install button does not switch to the next standard
value, it means that the current standard in the socket has lower
turbidity value than the previous standard. Check or replace the
standard.
6.8. If a standard is not available, press the Select button to skip to the next calibration
value without recording the value.
6.9. Repeat steps 6.7-6.8 until the calibration is complete. After recording or skipping the
last value, unit automatically exits calibration mode and is ready for operation.
6.10. Reset to factory calibration. To reset the calibration of the unit to factory settings,
ensure that you are in the working mode and the socket of the unit is empty. Press
and hold Install key for 5 seconds. The unit displays a dot . , then changes it to 0.0
or 0.00. The values are now reset.
6.11. Switch off the unit using the Power switch (position O). If an external power supply
is used, disconnect it from electric circuit.
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7. Specifications
The unit is designed for operation in cold rooms, incubators (except CO2 incubators)
and closed laboratory rooms at ambient temperature from +4°C to +40°C in a non-
condensing atmosphere and maximum relative humidity 80% for temperatures up to 31°C
decreasing linearly to 50% relative humidity at 40°C.
Biosan is committed to a continuous programme of improvement and reserves the
right to alter design and specifications of the equipment without additional notice.
Parameter \ Model
DEN-1
DEN-1B
Light source
LED
Wavelength
λ = 565 ± 15 nm
McFarland unit range
0.3 - 15.0 McF
0.00 - 15.00 McF
Resolution
0.1 McF
0.01 McF
Factory calibration range
0.5 - 5.0 McF
0.00 - 6.00 McF
Accuracy in the factory
calibration range
Full-scale error 3%
Measurement time
1 s
Sample volume
2 mL minimum
External diameter of tube
16 mm (using A-16 adapter) or 18 mm
Display
LED
LCD
Dimensions (L x W x H)
165 x 115 x 75 mm
Weight1
0.7 kg
Power consumption
1 W
0.1 W
Input current
12 V, 80 mA
12 V, 7 mA
External power supply
input AC 100-240 V, 50/60 Hz; output DC 12 V
Batteries
-
3 x AA
1
Accurate within ±10%
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Replacement
parts
Description
Catalogue
number
A-16
Adapter for tubes of 16 mm in external diameter
BS-050102-AK
Optional
accessories
Description
Catalogue
number
CKG16-4
Calibration kit for glass tubes 16 mm in diameter.
Polymer microparticle suspension. Set of 0.0, 0.5, 1.0, 2.0,
3.0, 4.0 McF turbidity standards
BS-050102-MK
CKG16-6
Calibration kit for glass tubes 16 mm in diameter.
Polymer microparticle suspension. Set of 0.0, 0.5, 1.0, 2.0,
3.0, 4.0, 5.0, 6.0 McF turbidity standards1
BS-050102-OK
CKG18-4
Calibration kit for glass tubes 18 mm in diameter.
Polymer microparticle suspension. Set of 0.0, 0.5, 1.0, 2.0,
3.0, 4.0 McF turbidity standards
BS-050102-NK
CKG18-6
Calibration kit for glass tubes 18 mm in diameter.
Polymer microparticle suspension. Set of 0.0, 0.5, 1.0, 2.0,
3.0, 4.0, 5.0, 6.0 McF turbidity standards1
BS-050102-PK
Tubes
78 glass sample tubes, 16x100x0.8 mm. Factory standard
BS-050102-LK
8. Care and maintenance
8.1. If the unit requires maintenance, disconnect the unit from the mains and contact
Biosan or your local Biosan representative.
8.2. All maintenance and repair operations must be performed only by qualified and
specially trained personnel.
8.3. Standard ethanol (75%) or other cleaning agents recommended for cleaning of
laboratory equipment can be used for cleaning and decontamination of the unit.
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For DEN-1, calibration is possible only up to 5.0 McF
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9. Warranty
9.1. The Manufacturer guarantees the compliance of the unit with the requirements of
Specifications, provided the Customer follows the operation, storage and
transportation instructions.
9.2. The warranted service life of the unit from the date of its delivery to the Customer is
24 months. For extended warranty, see 9.5.
9.3. Warranty covers only the units transported in the original package.
9.4. If any manufacturing defects are discovered by the Customer, an unsatisfactory
equipment report shall be compiled, certified and sent to the local distributor address.
To obtain the claim form, visit section Technical support on our website at link
below.
9.5. Extended warranty.
For DEN-1B, the Premium class model, one year of extended warranty is available
free of charge after registration, during 6 months from the date of sale. Online
registration form can be found in section Warranty registration on our website at the
link below.
For DEN-1, the Basic Plus class model, extended warranty is a paid service. Contact
your local Biosan representative or our service department through the Technical
support section on our website at the link below.
9.6. Description of the classes of our products is available in the Product class
description section on our website at the link below.
Technical support
Registration
Product class description
biosan.lv/en/support
biosan.lv/register-en
biosan.lv/classes-en
9.7. The following information will be required in the event that warranty or post-warranty
service comes necessary. Complete the table below and retain for your records.
Model
DEN-1 & DEN-1B, densitometers, suspension turbidity detectors
Serial number
Date of sale
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10. EU Declaration of conformity
Unit type Densitometers
Models DEN-1, DEN-1B
Serial number 14 digits styled XXXXXXYYMMZZZZ, where XXXXXX is
model code, YY and MM – year and month of production,
ZZZZ – unit number.
Manufacturer SIA BIOSAN
Latvia, LV-1067, Riga, Ratsupites str. 7/2
Applicable Directives EMC Directive 2014/30/EU
LVD Directive 2014/35/EU
RoHS2 2011/65/EU
WEEE 2012/19/EU
Applicable Standards LVS EN 61326-1: 2013
Electrical equipment for measurement, control and
laboratory use. EMC requirements. General requirements.
LVS EN 61010-1: 2011
Safety requirements for electrical equipment for
measurement, control, and laboratory use. General
requirements.
We declare that this product conforms to the requirements of the above Directives
____________________ ____________________
Signature Signature
Svetlana Bankovska Aleksandr Shevchik
Managing director Engineer of R&D
____________________ ____________________
Date Date
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Biosan SIA
Ratsupites 7, build.2, Riga, LV-1067, Latvia
Phone: +371 67426137 Fax: +371 67428101
http://www.biosan.lv
Edition 2.03 – March 2018
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