IKA Dry Block Heater 4 - Manual (Page 14)

14
Controlling the temperature via contact thermometer
The preferable method for controlling the average temperature
is with the contact thermometer. After the set point tempera-
ture has been adjusted, this results in a short heating-up time,
practically no temperature drift and only minor fluctuation in
temperature.
A 6-pin jack is located on the rear side of the instrument for
connecting the contact thermometer or the contact plug. The
electronics of the instruments returns a test current that must
flow via connector pins 3 and 5 for the heating plate to heat up.
Settings
For the detailed instructions for settings and limit values, refer to
the operating instructions for the instrument you are connecting.
The target temperature of the medium is set at the contact
thermometer. The heater buttons +/- (J) and (K) on the de-
vice can be used to preselect the required surface tempera-
ture of the heating plate.
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 e.g. breakage of
contact thermometer or falling out of the cable plug, the hea-
ting cuts off. The required plug allocation is indicated on a refe-
rence plate above the diode bushing.
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.
Maintenance and cleaning
The device is maintenance-free.
Cleaning
For cleaning disconnect the main
plug.
Only use cleansing agents which have been recommended by
IKA
® .
Dyes Isopropyl alcohol
Construction materials Water containing surfactant,
isopropyl alcohol,
Cosmetics Water containing surfactant,
isopropyl alcohol
Foodstuffs Water containing surfactant
Fuels Water containing surfactant
- Do not allow moisture to get into the appliance when cleaning.
- Wear protective gloves when cleaning the devices.
- Please consult with IKA
® before using any cleaning or deconta-
mination methods, other than those recommended here.
Ordering spare parts
When ordering spare parts, please give:
- Machine type
- Manufacturing number, see type plate
- Item number and designation of the spare part, see
www.ika.com
- Software version
Repair
In case of repair the device has to be cleaned and free from any
materials which may constitute a health hazard. Please request
the form to "clearance certificate" from IKA. Or, use the down-
load-print the form to the IKA
® website www.ika.com.
If you require servicing, return the appliance in its original
packaging. Storage packaging is not sufficient. Please also use
suitable transport packaging.
Timer/Counter
After the device has been switched on, the "Timer/ Counter" but-
ton (I) can be used to toggle between timer mode and counter
mode.
Timer
Pressing the buttons "+" (G) and "-" (H) allows selection of a
time period of up to 99 hours and 59 minutes. Once the heating
function (F) is activated, the preset time starts to run. When the
total time has run down to 00 hours and 00 minutes, a warning
buzzer sounds for 30 seconds and in addition the display flashes.
The heating function is then deactivated.
Counter
When the heating function is stated by pressing the button (F)
the counter is activated. In counter mode the time is counted
upwards from 00 hours 00 minutes until the heating function is
stopped. The counter always starts from 00:00 hh:mm.
Selection of Timer/Counter
Pressing the button (I) toggles between timer mode and counter
mode. The mode can be activated only when the heating func-
tion is off.