Design And Function; Isometric Views - WIKA CTD9100-1100 Betriebsanleitung

4. Design and function

4. Design and function
The temperature dry-well calibrator consist of a robust,
grey-blue-painted steel enclosure, with a carrying handle on
EN
top.
The rear part of the enclosure includes a metal block with an
opening for the test item, accessible from the top.
The calibrator consists of an equaliser block CERAMIC
fitted with holes, in which the thermometers under test are
inserted.
The metal block incorporate the heating elements and
the temperature sensor for determining the reference
temperature. The temperatures sensors used for controlling
and protecting the instrument are thermocouples. Both are
inserted directly into the equalizing block. Therefore the
controlled temperature value is close to the real value in the
block.
A heater element heats the block and an electronic
µController with static relay output checks and regulates the
temperature.
The metal block is thermally insulated.
Also ventilation holes are installed for the best heat
circulation. A fan is fitted inside the regulating container,
which prevents the metal structure from heating.
The front part contains the complete electronic unit for
controlling the reference temperature.
Solid state relays (SSR) are used to control the heating and
cooling elements.
Constant use at extreme temperatures reduces
the life of the heating elements itself. Limit the
number of hours at which the heater is used at
maximum temperatures to the time required by
the calibrator in order to prolong the life of the
resistance heater.
On the front panel is the controller, which is fitted with a
LC-Display (2 rows) for the reference and set temperature.

4.1 Isometric views

Front and top
On the top of the dry-well temperature calibrator, you will find
the dry well access opening for inserting the inserts and the
insulator.
The controller, with display and controls, is located on the
front of the calibrator.
Directly below it is the RS-232 interface, the temperature
switch test and the overtemperature LED.
In the lower area are the mains connection socket and the
power switch with its fuse-holder.
Furthermore the mains voltage and the fuse rating is given.
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Rear of the instrument
On the rear of the equipment is the fan.
This must not be obstructed in any way.
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4
3
2
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1 Temperature block with insert and insulator
Mains connection socket with power switch and fuse
2
RS-232 interface, temperature switch test and the
3
overtemperature LED
Controller
4
Handle
5
Fan
6
Vent slots
7
WIKA operating instructions, model CTD9100-1100
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