Four E's Scientific OHS-20D Reference guide

Document#:OSH20DMREVA
4ESUSA-Part# OHS-20D, OHS-40D, OHS-60D
Revision#:A
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com | [e-mail]
LED Digital Overhead Stirrer
OHS- 20D / OHS- 40D / OHS- 60D
Support Information
Register
Support

1
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
TABLE OF CONTENTS
Declaration of Conformity 2
Safety Instructions 2
Correct Use 4
Unpacking 5
Operating Instructions 6
Switch On and Run 7
Faults 7
Error Codes 8
Maintenance and Cleaning 8
Technical Data 9
Warranty 10

2
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
1. Declaration of conformity
We declare under our sole responsibility that this product is in compliance with the regulations 2014/35/EU,
2006/42/EC and 2014/30/EU and conforms to the standards or normative documents: EN 61010- 1, EN
61010- 1- 2- 051, EN 61326- 1, EN 60529 and EN ISO 12100.
2. Safety instructions
General information
●Read the operating instructions in full before using and follow the safety instructions.
●Keep the operating instructions in a place where they can be accessed by everyone.
●Ensure that only trained staff workwith the appliance.
●Follow the safety instructions, guidelines, occupational health and safety, and accident prevention
regulations.
●Because the options for combining products, tools, stirring vessels, experiments, and media are
nearly endless, user safety cannot be ensured simply with design requirements on the part of the
product.
○For example, glass devices or other stirring vessels that are sensitive to mechanical stress
can be damaged or shattered by an imbalance, increasing the speed too quickly or too little
distance between the stirring element and the stirring vessel. Users can suffer serious injury
from glass breakage or from the freely rotating stirring element. For this reason, it may
become necessary for users to take other precautionary safety measures.
●Only process media that will not react dangerously to the extra energy produced through
processing.
○This also applies to any extra energy produced in other ways (e.g., through light irradiation).
●Do not operate the instrument in explosive atmospheres, with hazardous substances or under
water.
●Process pathogenic materialsonly in closed vessels under a suitable fume hood.
⚠If in stalla tio n o r p o sitioning c a nno t e ns ure this a c c e ss a t a ll t im e s , a n a d d itio na l EMERGENCY
STOP switch that can be easily accessed must be installed in the work area.
●Please contact us if you have any questions.
Instrument design
●The instrument is not suitable for hand-held operation.
●The high torque requires particular care in the choice of stand, cross sleeve, and anti-rotation
element for the agitating vessel.
●Set up the stand in a spacious area on an even, stable, clean, non-slip, dry, and fire proof surface.
●Ensure that the stirring element is securely clamped in the chuck.
●Use stirring shaft protective equipment.
●The agitated vessels used for stirring must be secured. Make sure that the entire m ixing structure
is stable.
Accessories
●Protect the instrument and accessories from impact.
●Check the instrument and accessories for damage before each use. Do not use damaged
components.
●Safe operation is only guaranteed with the accessories provided by Four E’s Scientific.

3
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
●Always switch the main switch to the OFF positionand disconnect from the power source before
changing the stirring element and fitting allowed accessories.
Instrument protection
●There may be electrostatic activity between the medium and the output shaft which could cause a
direct danger.
●After an interruption in the power supply or a mechanical interruption during a stirring process,
the unit does not restart automatically.
●It is important to note that the surfaces of the motor (cooling fins) and certain parts of the bearing
may get very hot during operation.
●Never cover the ventilation slots or cooling fins on the motor or on the instrument.
●Avoid knocking and impactingthe lower end of the shaft and the chuck gear teeth. Even minor,
imperceptible damage can lead to imbalance and uneven shaft action.
●Ensure that the stand does not start to move.
●Imbalance of the output shaft, the chuck, and the stirring tools can lead to uncontrolled resonant
vibrational behavior of the instrument and the whole assembly. Glass apparatus and stirring
containers can be damaged or shattered by this. It can cause injury to the operator and can
damage the rotating stirring tool. In this case exchange the stirring tool for one without imbalance
or remedy the cause of the imbalance. If there is still imbalance, return it to thedealer or the
manufacturer along with a description of the fault.
●If the instrument is operated too long in overload orif the ambient temperature is too high, the
instrument will switch off automatically.
●The machine must onlybe serviced by trained representatives. Unauthorized service will void the
warranty and could be dangerous.
Experiment procedure
●Please observe the permitted speed for the stirring element. Never set to a higher speed.
●Make certain that the unit is set at the lowest speed before using; otherwise, the unit will begin
running at the speed set during the last operation. Gradually increase the speed.
●Pay attention when setting the speed to any imbalance of the stirrer tools and possible spraying
of the medium to be stirred.
⚠Never operate the instrument with the stirrer tools rotating freely. Ensure that parts of the
body, hair, jewelry or items of clothing cannot be trapped by the rotating parts.
⚠The operation of a free rotating shaft end is dangerous. Therefore, for safety reasons, only
insert through the stirring tool over the upper edge of housing at standstill.
⚠Wear your personal protective equipment in accordance with the hazard category of the
medium to be processed, otherwise there is a risk of:
○splashing of liquids
○projectile parts
○body parts, hair, clothing, and jewelry getting caught.
⚠Beware of the risk o f:
○flammable materials
○glass breakage as a result of mechanical shaking power.

4
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
○agitating vessel breakage as a result of displacement of no- fixed vessel
●Reduce the speed if:
○the medium splashes out of the vessel because the speed is too high
○the instrument is not running smoothly
○the instrument begins to move around because of dynamic forces
○an error occurs
○agitating vessel relative displacement as a result of mechanical resonance
⚠Do not touch rotating parts during operation!
Power supply/OFF
●The instrument can only be disconnected from the mains supply by pulling out the mains plug or the
connector plug.
●The socket for the mains cord must be easily accessible.
●The voltage stated on the type plate must correspond to the mains voltage.
3. Correct use
Application
●Fo r m ixin g/ s tirring liq u id s w it h lo w to h igh vis co sitie s b y va rio u s s tirring to o ls. Inte n d e d u se : St and
device (chuck points down)
Range of use
●La b o ra to rie s , p h arm a c ie s, u nive rs itie s , schools. (indoor use only)
●The safety of the user cannot be guaranteed:
○If the instrument is operated with accessories that are not supplied or recommended by the
manufacturer
○If the instrument is operated improperly or contrary to the manufacturer's specifications - if
the instrument or the printed circuit board are modified by third parties.
○The voltage used does not correspond to the voltage stated on the serial number p la te .

5
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
4. Unpacking
Unpacking
●Please unpack the device carefully
●In the case of anyshipping damage a detailed report must be sent immediatelyto the freight
company.
⚠Note: Do not connect the power supply if the device is visibly damaged.
Delivery scope
Items
Qty
Overhead stirrer (including the extension arm)
1
Power cable
1
Propeller stirrer
1
Chuck protector
1
Op e ra ting in s tru ctio n
1

6
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com

7
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
Securing the universal plate stand
Firstly, manually screw the stainless-steel stand (⑧) with the nut (⑪) into the corresponding threaded
hole on the baseplate (⑩). Then tighten the nut (⑪) clockwise with your wrench. Finally, check whether
the stainless-steel rod is firmly fixed on the baseplate.
Securing the overhead stirrer to the stand
First secure the cross clamp (⑨) to the stainless-steel stand (⑧), and the height of the cross clamp can
be adjusted according to different vessel volume, then tighten the handle (left) (⑦). Then secure the
extension arm to the other slot of cross clamp (⑨), and tighten the handle(right) (⑦) above the cross
clamp (⑨). Before use, please check whether the stirrer is firmly fixed. The position of the stirrer can be
adjusted only when the instrument is switched off and the stirrer stops working.
Securing the stirring shaft
Type- A Chuck:Turn clockwise to loosen the chuck, insert the stirring shaft into the mounting hole
of the chuck (⑫), and turn anticlockwise to tighten the chuck (⑫). The stirring shaft can only be
changed when it stops working and the power supply is disconnected.
Type- B chuck:Turn counterclockwise the chuck key (⑤) to loosen the chuck. Then insert the
stirring shaft into the mounting hole of chuck (⑥) and turn clockwise the chuck key (⑤) to tighten
chuck. The stirring shaft can only be changed when it stops working and the power supply is
disconnected.
4. Switch on and run
●The voltage required by the device must correspond to the mains voltage.
Note: If the above condition is met, the device is ready for operation when the main plug is plugged
in.
If the above condition is not met, safe operation is not guaranteed and the device could probably be
damaged.
●After switch on the main switch (④), all the LED display is light and it will display the last setting
speed on the screen after a few seconds. Ensure the speed set is suitable for the test medium
selected
●If not sure whether the speed is proper or not, set the speed adjustment knob (②) to the lowest
speed (left hand position). Press the knob (②) to start or stop the stirring.
5. Faults
●The device doesn’t work when switched on.
○Check if the power cord is connected correctly.
○Check if the DC power port is disconnected or loose.

8
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
6. Error codes
Error code
Cause
Error Description
Solutions
Er1
Motor blockage
Motor stops running and the
buzzer alarms
Switch off the device and
restart again
Er2
Motor overspeed
Er3
Motor overload
Er4
Device over temperature
7. Maintenance and cleaning
The device is maintenance- free. It is only subject to the natural wear and tear of components and their
statistical failure rate.
Maintenance
Please send the device for repair only after it has been cleaned and is free from any materials which may
constitute a health hazard. If you require service, return the instrument in its originalpackaging. Ifthe original
packaging is not sufficient. Please also use suitable transport packaging.
Cleaning
●Disconnect the main plug when cleaning!
●Wear protective gloves during cleaning the instruments.
●Electrical instruments may not be placed in the cleansing agent for the purpose of cleaning.
●Do not allow moisture to get into the instrument when cleaning.
●Use only cleaning agents which have been approved by us to clean our instruments.
Dyes
isopropyl alcohol
Construction materials
water containing tenside / isopropyl alcohol
Cosmetics
Food stuffs
water containing tenside
Fuels
water containing tenside
For materials which are not listed, please request information from our application support.

9
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
8. Technical Data
Model
OHS-20D
OHS-40D
OHS-60D
Voltage [V]
100 V-240V
100 V-240V
100 V-240V
Frequency [Hz]
50/60
50/60
50/60
Max. input power [W]
72
145
220
Speed range under
nominal load [rpm]
0/50-2000
0/50-2000
0/50-2000
Speed increment [rpm]
Stepless
Stepless
Stepless
Speed accuracy
10rpm
10rpm
10rpm
Max. torque at stirrer
±1%
±1%
±1%
shaft [N.cm]
20
40
60
Max. stirring
quantity(H₂O)[L]
20
40
60
Max. Viscosity [mPas]
10,000
50,000
50,000(2000rpm) 100000(1000rpm)
Speed display
LED
LED
LED
Protection class
according to DIN EN
60529
IP42
IP42
IP42
Protection at overload
Yes
Yes
Yes
Motor protection
Yes
Yes
Yes
Over temperature
protection
Yes
Yes
Yes
Permissible ambient
temperature [℃]
5-40
5-40
5-40
Permissible relative
humidity [%]
80
80
80
Clamping chuck-
clamping range [mm]
0.5-10
0.5-10
0.5-10
Dimensions (WxDxH)
(without extension arm)
[mm]
71x174x240
71x174x240
71x174x240

10
51 Everett Drive, Suite B-10. West Windsor, NJ 08550
P: [phone] | www.4Es-USA.com
Weight (with extension
arm and clamping
chuck) [kg]
2.3
2.5
2.8
9. Warranty
You have purchased an original laboratory machine which meets the highest engineering and quality
standards. In accordance with our warranty conditions, the warranty period is 24 months from our
shipment. For claims under the warranty, please contact yourlocal dealer. You may also send the machine
directly to our works, enclosing the delivery invoice and giving reasons for the claim. You will be liable for
freight costs.
The warranty does not cover worn out parts, nor does it apply to faults resulting from improper use,
insufficient care or maintenance not carried out in accordance with the instructions in this operating manual.