Objective Heater Accessories
The Bioptechs thermal spacer is a 9mm thick internally and externally threaded polymer ring that goes between an objective and the nosepiece to inhibit heat loss from the objective to the nosepiece. The thermal isolator is used when cooling an objective to both inhibit heat from propagating into the objective from the nosepiece and prevent condensation from forming on the exit optic of the objective once the objective is cooled. The Thermal Isolator includes a double sided, broadband AR coated window to enable a dry air trap that prevents condensation.
Objective Wrench and Pliers – 021523
In order to expose sufficient surface for mounting heat transfer devices on some manufacturers’ objectives, it is necessary to remove the outer decorative collar which contains written information such as magnification, N.A., etc. The objective wrench is designed to enable the user to isolate the mechanical stress applied to an objective when removing this collar. The rotational force applied to the objective must be applied exclusively to the mounting threads and the cover and not to the internal optics or the spring loaded retracting casing. The wrench is designed with two thread sizes (0.8″ x 36 TPI (RMS) and 25mm x 0.75 mm/thread). It will enable the user to isolate the force necessary to remove the outer sleeve from the core of the objective by securely binding on the external threads of the objective and provide sufficient leverage for removal of the cover. Click Here for User Instructions
Bioptechs Objective Cooling Collar – 150303
The Objective Cooling Collar is an attachment to an objective that provides an isolated pathway through which a refrigerated fluid can flow. This provides an efficient means of cooling the objective. The source of the chilled fluid can be as simple as a dewar of ice water or as sophisticated as an AC powered recirculating chiller bath. The removal of heat from the objective is more difficult than heating because you are limited by the thermal transfer efficiency of both the objective and the contact surface of the cooling ring. Therefore, the cooling ring needs to be of sufficient size and contact surface to work. It is advisable to make sure you have enough room under the stage for the additional diameter required for the cooling collar and tubing. Cooling collars are precision machined to fit specific objectives. Please call Bioptechs for additional compatibility information.
Objective Cooling Collar Instructions.
Objective Thermal Isolator & Spacer
Thermal isolation of the objective and nosepiece is necessary when the temperature of the objective is made different from the scope. In the case of warming the objective, only a Thermal Spacer is necessary. In the case of cooling an objective, it prevents heat within the scope and nosepiece from being extracted through an objective being cooled. In addition, it prevents ambient air from forming condensation on the lower element of the objective. The Thermal Isolator is basically a Thermal Spacer equipped with ports to introduce dry air and a double sided, broadband AR coated window to contain the dry air when applied.
The Bioptechs’ Thermal Isolator is a device made of a material having a low thermal conductivity and mounts between the objective and nosepiece used to reduce heat exchange between the objective and nosepiece. It is used when cooling objectives below ambient temperatures. It also contains a two sided AR coated window and gas ports through which dry air is introduced to prevent condensation.
RMS (0.8″ x 36 tpi) – 152009R
25mm x 0.75mm – 152009
27mm x 0.75mm – 150827-09
The Bioptechs’ Thermal Spacer is a device made of a material having a low thermal conductivity and mounts between the objective and nosepiece used to reduce heat exchange between the objective and nosepiece. It is used when heating objectives above ambient temperatures. It will enhance the thermal transfer efficiency of the objective heater (see thermographs below)
RMS (0.8″ x 36 tpi) – 152019R
25mm x 0.75mm – 152019
27mm x 0.75mm – 150827
9mm Stage Lift Kit – 19-19-03
Both the Thermal Isolator and Thermal Spacer will add 9mm to the height of the objective. Therefore, it is necessary to elevate the stage by the same amount. The Bioptechs stage spacer kit contains 4, 9mm spacers and longer screws to raise the position of the stage. When the height of a microscope stage is modified to accommodate the addition of a Thermal Isolator or Thermal Spacer to one of the objectives, it is recommended to add spacers to all the other objectives on the turret to keep them parfocal.
Comparison of the effect of the use of a Thermal Isolator or Spacer.
Notice the difference in temperatures of the nosepiece shown above. The objective without the thermal spacer (left) is transferring heat to the nosepiece. Therefore, more energy has to be applied to compensate for the heat loss as demonstrated by the elevated temperature of the heating band. Although it is possible to overcome the heat loss with more power, it is not recommended due to the possibility of damage to the objective and the fact that the temperature regulation will become more labored.
However, the objective with a thermal spacer (right) demonstrates very little heat loss to the nosepiece and the heater-band is obviously cooler. With less continual heat drain from the nosepiece, less energy is required to establish and maintain temperature of the objective. Also notice how efficient the objective heater is in transferring heat to the objective. You can see the band is significantly cooler. This means there is no excess heat being radiated from the objective heater band.
Thermal Propagation Videos
The time lapse videos below show how a thermal isolator or spacer decreases the amount of time it takes to bring an objective to temperature, decreases the heat loss to the nosepiece, and decreases the amount of energy to maintain setpoint temperature. To view the videos click on the images below.
|Bioptechs Objective Heater warming a 60x objective without a thermal spacer
This video demonstrations thermal propagation that occurs through an objective when warming without a thermal spacer. Notice the warming of the nosepiece of the microscope.
|Bioptechs Objective Heater warming a 60x objective with a thermal spacer
This video demonstrations thermal propagation that occurs through an objective when warming with a thermal spacer. Notice there is no warming of the nosepiece of the microscope.
|152009R||OBJECTIVE THERMAL ISOLATOR RMS||$632.50|
|152009||OBJECTIVE THEMAL ISOLATOR 25MM||$632.50|
|15082709||OBJECTIVE THERMAL ISOLATOR 27MM||$649.75|
|152019R||OBJECTIVE THERMAL SPACER RMS||$126.50|
|152019||OBJECTIVE THERMAL SPACER 25MM||$126.50|
|150827||OBJECTIVE THERMAL SPACER 27MM||$143.75|
|191903||9MM STAGE SPACER KIT||$63.25|
|21523||OBJECTIVE WRENCH & PLIER SET||$221.38|
|150303||OBJECTIVE COOLING COLLAR||$1,391.50|