Alexika RH digital: DANGER

10

10

 Explication of warning symbols

DANGER

CAUTION

WARNING

This symbol identifies information 

that is of vital importance for protecting your health and 

safety

. Disregarding this information may lead to health impairment and injuries.

This symbol identifies information 

that is of importance for the technically correct functioning 

of the system

. 

Disregarding this information may result in damage to the instrument or to system components.

This symbol indicates information 

which is important for proper use and ensuring that the opera-

tions of the instrument are performed efficiently.

Failure to observe this information may result in inaccurate results.

Attention - Note the hazards of magnetism!

Danger -  Reference to exposure to a hot surface!

General hazard.

ATTENTION DANGER

 EC - Declaration of Conformity

We declare under our sole responsibility that this product is in compliance with the regulations 2006/95/EC and 2004/108/EC and con-

forms to the standards or standardized documents: DIN EN IEC 61010-1, -2-010, -2-051 and DIN EN IEC 61326-1.

 Warranty

In accordance with

 IKA

®

 warranty conditions, the warranty period is 24 months. For claims under the warranty please contact your local 

dealer. You may also send the machine directly to our factory, 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.

 Accessories

• Stirring bars 

   

See catalog

• Bath attachments  

See catalog

• Synthesis Attachments 

See catalog

• 

RS 1

Set of stirring bars 

• 

RSE

PTFE-stirring bar remover 

• 

H 102.1

Protection handle

• 

H 16 V

Support rod 

• 

H 16.1

 Extension 

• 

H 38

Holding rod 

• 

H 44

Boss head clamp 

• 

ETS-D

  

Contact thermometer 

• 

H 102

Protective cover (RH basic) 

•

 H 103

Protective cover (RH digital)

   

See more accessories on 

www.ika.com

11

11

>100 mm

>100 mm

>100 mm

 Safety instructions

WARNING

• 

Read the operation instructions completely before star-

ting up and follow the safety instructions.

• Keep  the  operation  instructions  in  a  place  where  they  can  be 

accessed by everyone.

General information

• Ensure that only trained staff work with the appliance.

• Follow  the  safety  instructions,  guidelines,  occupational  health 

and safety and accident prevention regulations.

• Socket must be earthed (protective ground contact).

• 

Attention - Magnetism!

  Effects of the magnetic field have to be ta-

ken into account (e.g. data storage media, 

cardiac pacemakers ...)

• 

Risk of burns! 

  Exercise caution when touching the housing  

parts and the heating plate. The heating plate 

can reach temperatures in excess of 320 °C. Pay 

attention to the residual heat after switching off.

  The device may only be transported in cold condition!

Device design:

• 

Do not

 operate the appliance in explo-

sive atmospheres, with hazardous subs-

tances or under water.

• Set up the appliance in a spacious area on an even, stable, clean, 

non-slip, dry and fireproof surface.

• The feet of the appliance must be clean and undamaged.

• Ensure that the mains power supply cable does not touch the 

heating plate.

• Check  the  appliance  and  accessories  for  damage  before  each 

use. Do not use damaged components.

Permissible medium / contaminants / side reactions

• 

Attention!

  Only process and heat media that has a 

flash point higher than the adjusted safe 

temperature limit that has been set (100 

to 360 °C).

The safe temperature limit must always be set to at least 25 °C 

lower than the fire point of the media used.

• Beware of hazards due to:

  - flammable materials

   - combustible media with a low boiling temperature

   - glass breakage

   - incorrect container size

   - overfilling of media

   - unsafe condition of container.

• Process pathogenic materials only in closed vessels under a suitable 

fume hood. Please contact 

IKA

®

 if you have any questions.

• Only  process  media  that  will  not  react 

dangerously to the extra energy produ-

ced through processing. This also ap-

plies to any extra energy produced in 

other ways, e.g. through light irradiation.

• The heating plate can heat up due to the action of the drive ma

-

gnets at high motor speeds, even if the heater is not operational.

• Please consider any possible contaminations and unwanted che

-

mical reactions.

• It may be possible for wear debris from rotating accessory parts 

to reach the material being processed.

• When using PTFE-coated magnetic bars, the following has to be 

noted: 

Chemical reactions of PTFE occur in contact with molten 

or solute alkali metals and alkaline earth metals, as well as with 

fine powders of metals in groups 2 and 3 of the periodic system 

ATTENTION

DANGER

at temperatures above 300 °C - 400 °C. Only elementary flu-

orine, chlorotrifluoride and alkali metals attack it; halogenated 

hydrocarbons have a reversible swelling effect.

                 

(Source: Römpps Chemie-Lexikon and ”Ulmann”, Volume 19)

Experimental procedures

• 

Wear your personal protective equip-

ment in accordance with the hazard 

category of the media to be processed. 

There may be a risk from:

  - splashing and evaporation of liquids,

  - ejection of parts,

  - release of toxic or combustable gases.

• 

Reduce the speed if:

  - the medium splashes out of the vessel,

  - the appliance is not running smoothly,

   - the container moves on the heating plate.

Accessories

• Safe  operation  is  only  guaranteed  with  the  accessories  descri-

bed in the ”Accessories” chapter.

• Always disconnect the plug before attaching accessories.

• Observe the operating instructions of the accessories.

• Ensure that the external temperature sensor (ETS-D...) is inserted 

in the media to a depth of at least 20 mm.

• The ETS-D external temperature sensor must always be inserted 

in the media when connected.

• Accessories must be securely attached to the device and cannot 

come off by themselves. The centre of gravity of the assembly 

must lie within the surface on which it is set up.

Power supply / Switching off

•The  voltage  stated  on  the  type  plate  must  correspond  to  the 

mains voltage.

•The socket for the mains cord must be easily accessible.

•The appliance can only be disconnected from the mains supply 

by pulling out the mains plug or the connector plug.

• The  device  will  automatically  restart  in 

mode B following any interruption to the 

power supply. (RH digital)

For protection of the equipment

• The appliance may only be opened by experts.

• Do not cover the device, even partially e.g. with metallic plates

or 

film. This may result in overheating.

• Protect the appliance and accessories from bumps and impacts.

• Keep base plate clean.

• Observe  minimum  distances  between  devices.  Between  device 

and wall should be 100mm (min), above the assembly

 should be 

800mm (min).

WARNING

DANGER

WARNING

WARNING

DANGER

12

 Unpacking

• Unpacking

  - Please unpack the device carefully

  - In the case of any damage a report must be sent immediately 

(post,  rail or forwarder).

• Contents of package 

  - Magnetic stirrer with heating RH basic or RH digital 

  - Mains cable 

- Operating Instructions 

  - Screwdriver 

- H 102.1 Protection handle

  - H102 protective cover 

(RHb)

  - H103 protective cover (RHd)

  - Stirring bar 

20, 30 

and 

40

 mm

 Correct use

• Use

   - For mixing and/or heating liquids.

• Range of use (only indoors)

   -  Laboratories 

-  Schools

   -  Pharmacies 

-  Universities

This device is suitable for use in all areas except:

  - Residential areas

  - Areas that are connected directly to a low-voltage supply net-

work that also supplies residential areas.

The safety of the user cannot be guaranteed if: the appliance is 

operated with accessories that are not supplied or recommended 

by the manufacturer, the appliance is operated improperly accor-

ding to the manufacturer’s specifications or the appliance or prin-

ted circuit board are modified by third parties.

 Commissioning

Please follow above directions to ensure safe operation and 

prevent device from suffering damage.

The device is switched on and off using the main switch 

(A)

 on the 

right hand side. 

After the device has been switched on using the main switch 

(A)

 the 

“power“ LED 

(E)

 lights up; this indicates standby status. 

The device is now ready to operate. If the heating function is switched 

on, the LED 

(F)

 lights up, indicating that the heating process is active.

RH digital

Observe the ambient conditions (temperature, humidity, etc.) listed 

under Technical Data.

Make sure the contact plug 

(N) 

is plugged in.

Once this condition is satisfied, and the mains plug has been plugged 

in, the device is ready to operate. 

Please follow above directions to ensure safe operation and prevent 

device from suffering damage.

The device is switched on and off using the main switch

 (A) 

on the 

right hand side. 

A few seconds after the device has been switched on, the display 

will show all display segments, the software version, operating 

mode, target temperature and speed. 

The device is now ready for operation.

RH basic 

Observe the ambient conditions (temperature, humidity, etc.) listed 

under Technical Data.

Make sure the contact plug 

(N) 

is plugged in.

Before switching the device on, turn the two rotary knobs on the 

device to the off position.

Once these conditions are satisfied, 

and the mains plug has been plugged 

in, the device is ready to operate.

RH digital

Operating the device in mode A or B

Mode A

All settings will be stored if the device is switched off or disconnec-

ted from the power supply. The agitation and heating functions 

will be set to OFF when the device is powered on.

Mode B

All settings will be stored if the device is switched off or disconnec-

ted from the power supply. The agitation and heating functions 

will be set to ON or OFF when the device is powered on, depen-

ding on the previous status of the device.

Factory setting: mode A

The mode selected will be shown on the

display when the device is started up. 

Change the mode

 Setting the operation mode

           A

  mode

F 

Move device switch (A) to the OFF position

F 

Press and hold button (G and J)

F 

Move device switch (A) to the ON position

F 

Release button (G and J) until mode changed

i  

a 

The set value is indicated on the

      display                  

b

Assembly of 

H 102.1

 protection handle

i

i

Protection handle should be assembled in place for safety!

Please note that slight residual odor could be smelt during first-

heating of the heater.

We suggest to operate the unit under a fume hood during the first use.

13

RH digital

The heating function is started by pressing the button 

(G)

. The 

heating plate temperature can be set within the range 50°C 

to 320°C in 5 °C increments by pressing the buttons 

(I)

 or 

(H)

. 

The current temperature setting is shown on display and device 

operates at this temperature.

The unit has a built-in 600 w heating plate with a stainless steel 

surface. The heating plate is kept at a constant temperature by a 

control circuit. Two temperature sensors are built into the heating 

plate.

RH basic

The heating plate temperature is set using the “Temp“ rotary knob 

(C)

 with its associated scale. The scale values range from approx. 

room temperature to max. 320 °C. When the setting is 

0

 the 

device heating does not switch on. 

When the heating function is activated, the “Heating“ LED 

(F)

lights up.

 Heating function

 Setting the safety temperature limit

The max. attainable heating plate temperature is restricted to 

360°C by an adjustable safety temperature limit. Once this limit 

has been attained, the device stops heating.

The safe temperature limit must 

always be set at least 25 °C lower 

than the flash point of the media to 

be processed!

The temperature set for the heating plate will be at least 25 °C 

lower than the safe temperature limit.

Factory setting:

 about 360 °C

.

WARNING

Setting the safety temperature limit

After switching on the device, the safety temperature limit 

(B)

 can 

be adjusted using a screwdriver.

  Do not turn the setting screw beyond the clockwise or anticlock-

wise stop. This will cause irreparable damage to the potentiome-

ter.

• Using  the  screwdriver  supplied,  turn  the  “Safe  Temp”  setting 

screw

 (B) 

to the clockwise stop. 

• Use  the  temperature  rotary  knob 

(C)

[RH basic]

 or with the 

button 

(H 

or

  I)

[RH digital] 

to set the target temperature to 

the desired ”Safe Temp” and wait until this is attained, at which 

point the “Heating“ LED 

(F)

 goes out.

• Turn the “Safe Temp” setting screw 

(B)

 slowly anticlockwise until 

the heating function switches off and the indicator lamp 

(E)

 blin-

king (RH basic) or the display shows E24 (RH digital)...

• Then, turn the “Safe Temp” setting screw 

(B)

 slightly clockwise. 

  Switch the device off and on again at the main switch 

(A)

. After 

this, the device is ready to operate.

 Controlling the Medium temperature limit via Contact Thermometer

The preferable method for controlling the average temperature is with 

the ETS-D or contact thermometer. Adjust set point temperature.  After a 

brief heat-up period, you will reach set temp.  This method provides practi-

cally no temperature drift and only minor fluctuations of temperature. 

I

n addition to precise control function, the adjustable ”MAX-

The stirring bar, whose max. length should not exceed 80mm, is 

driven via permanent magnet. The permanent magnet is directly 

attached to the output shaft of the motor. 

The actual speed depends on the load and the voltage. Please 

note that fluctuations within the permissible tolerance of the mains 

voltage, and process-based changes to the viscosity of the medium 

being stirred, can also cause minor fluctuations in the speed.

RH basic

The motor speed is set using the rotary knob for the motor 

(D)

. The 

speed setting corresponds approximately to the value in rpm on 

the speed scale. Turning the rotary knob 

(D)

 clockwise to the stop 

sets the motor to run at maximum speed.

RH digital

The stirring function is started by pressing the button 

(J)

. The speed 

can be set within the range 0 to 2000 rpm in increments of 50 

rpm by pressing the buttons 

(L)

 or 

(K)

. The current speed setting 

is shown on the display; this is the speed at which the device 

operates.

 Stirring function

TEMP” function makes the ETS-D a temperature limiter that 

has a direct effect on the average temperature. When this 

“MAXTEMP” is exceeded, because of a defect in the control 

circuit, “safe temp“ or “set point temp“ on RH, the ETS-D 

immediately turns off the separate circuit of RH

14

Safety contact thermometers

acc. to DIN 12 878 class 2 or acc. Gerstel are connected with a three-

wire cable, the test current flows through the contact thermometer.

Safety function

:

If the test current is interrupted because of breakage of contact ther-

mometer or unplugging of thermometer, the heating cuts off.

Contact thermometer without safety circuit

Acc. to DIN 12 878 class 0. The instrument only heats if the test 

current circuit is closed by an electrical connection of the plug pins 

3 and 5.

2-wire connecting cables:

Connect plug pins 3 and 5 of the instrument plug.

3-wire connecting cables:

The test current circuit can also be produced in the terminal head 

of the contact thermometer (connect plug pins 2 and 3)-Safety 

Advantage!

A 3-wire cable with the required bridge is an available accessory.

• Remove 

threaded plug (

R) 

• Remove the protective cap from the support rod

• Put the washer between housing and nut

• 

Screw the support rod onto the device by hand until the end stop is reached

• Use an A/f 17 wrench to tighten the nut

• Accessories should be attached using boss head clamps.

 Assembling the stand

Note:

For bath attachments with diameters 

greater than 180 mm, use the support 

rod H 16 V with the extension H 16.1.

 Maintenance and Cleaning

The device is maintenance-free. It is subject only to the natural 

wear and tear of components and their statistical failure rate.

Cleaning

   

Disconnect main plug prior to cleaning!

Only use cleaning agents recommended by 

IKA

®

.

Contamination Cleaning agents

Dyes

isopropyl alcohol

Building materials

  water containing tenside/isopropyl alcohol

Cosmetics

water containing tenside/isopropyl alcohol

Foodstuffs

water containing tenside

Fuels

water containing tenside

- When cleaning, do not allow moisture to get into the unit.

- Wear the proper protective gloves during cleaning of the devices.

- Before performing a non-recommended method of cleaning or 

decontamination, the user must ascertain with

 IKA

®

 that this me-

thod will not destroy the instrument.

Spare parts order

When ordering spare parts, please give:

-  Machine type

-  Serial number, see type plate

-  Software Version (second displayed segment when the device is on)

-  Item and designation of the spare part please see 

www.ika.com

.

Repair 

Please send instrument in for repair only after it has been 

cleaned and is free from any materials which may consti-

tute a health hazard. 

For this you should request the “

Decontamination Clearance 

Certificate

” from 

IKA

®

, or use the download printout of it from 

the 

IKA

®

 website 

www.ika.com

.

Return the instrument in its original packaging. Storage packaging is 

not sufficient. Also, please use suitable shipping package materials. 

Information for Care and Maintenance of the HeatingPlate 

with Technical Enamel Coating 

The technical enamel makes the heating plate easier to care fort and 

more resistant to acids and bases. Because of it, however, the 

heating plate is also more susceptible to extreme fluctuations in 

temperature and the force of impact. This can result in cracks 

forming or the coating flaking off. 

Make certain that the bottom of the placing vessel is even, clean 

and dry. The bottom of the placing vessel must not have any sharp 

grooves, sides or edges. Remove residues of bases and immedialety.

We recommend most strongly that you clean the 

heating plate regularly.

Settings

For the detailed instructions for settings and limit values, please refer 

to the operating instructions for the instrument you are connecting. 

The desired average temperature can be adjusted on the 

ETS-D or contact thermometer. In addition, a “MAXTEMP” 

can be set for the ETS-D. A maximum average temperature 

can be set on the ETS-D to avoid malfunctions in combina-

tion with the RH. The required surface temperature of the 

heating plate can be selected with the  temperature  rotary 

knob or button.

Adjusting the temperature of device to the maximum adjustable tem-

perature will result in the fastest possible heating time, but the average 

temperature may fluctuate to values above the set-point temperature 

on the contact thermometer. By adjusting the temperature rotary knob 

or button to approximately twice the set-point value of contact thermo-

meter (with a set-point of 60°C, the temperature of device would be set 

to 120°C), you will reach a good compromise between a fast heating 

time and overshooting the set point.

If you adjust the temperature of device to exactly the set-point 

temperature, the medium will not reach the set-point temperature 

because some loss of the heat will always occur between the hea-

ting plate and the medium.

The maximum heating plate temperature can be adjusted 

with the “Safe Temp” screw.

The stirring function will continue to run at the speed that was set 

before the malfunction. 

A 6-pin jack is located on the rear side of the instrument for connec-

ting the ETS-D, contact thermometer or contact plug. The electronics 

of the instrument returns a test current which must flow through con-

nector pins 3 and 5 for the heating plate to heat up.

15

 Error Codes (RH digital)

 Technical data

Device

  

Operating Voltage Range - Rated voltage  

Vac

230 ± 10%  /  115 ± 10% /  100 ± 10%

Frequency  

Hz

50 / 60

Power consumption (+10%) max.  

W

 620 

Permissible duration of operation  

%

 100

Permissible ambient temperature  

°C

+5 to +40

Permissible relative humidity  

%

 80

Protection type acc. DIN EN 60529 

IP 21

Protection class 

 I

Overvoltage category 

II

Contamination level 

2

Operation at a terrestrial altitude 

m

max. 2000

Dimensions (W x D x H) 

mm

250 x 160 x 100

Weight  

kg

 2.8

Motor

Speed range 

rpm

0; 100 - 2000

Power consumption 

W

 20

Setting resolution (digital/basic) 

rpm

 50/Scale

Speed   stability (no load) at rated voltage   

   

≥ 500 rpm  

%

± 10

   

< 500 rpm 

rpm 

± 100

Stirred quantity max.(H

2

O)  

ltr

 15

Heating plate

Dimensions (Ø) 

mm

 135

Material 

stainless steel / enameled white

Heating

Heating power (-5%/+10%) at 

rated 

voltage 

W

 600

Adjustment and display resolution

 (digital/basic) 

K

 5/Scale

Surface temperature 

°C

ambient temperature ...320

Hysteresis of heating plate at rated voltage 

K

± 20

no container, center of heating plate at 100 °C 

Electronic Thermometer 

DIN 12878

Adjustable safety circuit

Safety temperature limit (adjustable) 

°C

100 - 360

Error Cause 

Effect 

Solution 

code

E3 

Temperature inside device is too high 

Heating off  - Switch off device and allow to cool down.

E4 

Motor or magnetic rods blockage 

Heating off  - Switch off device.

Motor off  - 

Warning! Only to be carried out by authorized service personnel:

  

Carry out an internal test on the device to check the plug-in connector for the motor.

E11 

Break in safety circuit 

Heating off  - Plug in contact plug (

N

).

- Plug in contact thermometer/temperature sensor.

- Replace faulty connecting cable, plug, or contact thermometer.

E21 

Failure in safety circuit test 

- Switch off and switch on again after about 1 minute.

E22 

  When fault is indicated again, please contact with

 IKA

®

 service.

E29 

- Set a higher safe temperature limit.

E24 

Surface temperature 

(Temperature of contr-

  Heating off  - Switch off device until the surface temperature of the heating plate is lower than

ol sensor)

 of the heating plate is higher than the   

  the selected safe temperature limit.

set safe temperature limit 

- Set a higher safe temperature limit.

E25 

Heating and switching element monitoring  Heating off  - Switch off device.

- Safety temperature limit > 100

°C 

  See also “Functional check of inactivating the safety circuit”.

  

- 

Warning! Only to be carried out by authorized service personnel:

  

Carry out an internal test on the device to check the plug-in connector for the heating element.

E26 

Difference between temperature of safety

  Heating off  - Switch off device.

sensor and temperature of control sensor 

- 

Warning! Only to be carried out by authorized service personnel: 

Control temperature

 > (Safety temperature + 40 K)  

   

Carry out an internal test on the device to check the plug-in connector for the temperature sensor.

If the actions described fail to resolve the fault or another error code is displayed then take one of the following steps:

   - Please contact the service department;

   - Send the device for repair, including a short description of the fault.