Schonstedt Thermal Specimen Demagnetizer TSD-1 Control Unit EL4028

Description: Thermal Specimen Demagnetizer TSD-1 Control Unit The TSD-1 has the following features: Heating: Specimens are heated in air to the required temperature for 45–60 minutesBatch size: Can handle small batches of "pilot" samplesCooling: One specimen batch can be blower cooled while another batch is being heated Schonstedt TSD-1 Thermal DemagnetizerThe TSD-1 (Fig. F20) is used to provide progressive thermal demagnetization of rock specimens by heating them to any specified temperature up to 800°C and then cooling them in a low magnetic field environment (<10 nT). External fields are attenuated by the shield assembly so that the instrument can be operated in a laboratory environment. Figure F21 shows the magnetic field profile of the TSD-1 and the position in the cooling chamber between 70 and 105 cm in which the magnetic field is the lowest. The instrument consists of two separate chambers: one for heating and one for cooling. They are arranged coaxially so that as soon as specimens in the furnace chamber reach thermal equilibrium, the specimen holder can be pushed directly into the cooling chamber. Complete chamber isolation and individual controls allow one specimen batch to be blower cooled while another batch is being heated. An outstanding feature of the instrument is its processing speed. The low thermal mass of both the furnace and sample holder promotes rapid heating and cooling of specimens. The short cycle time helps to minimize the amount of chemical change in specimens by limiting their exposure to high temperature. The basic sample holder is an open assembly with two inconel tubes on which lies a quartz tray for placing specimens. The quartz tray can hold up to 10 specimens, each 2.5 cm in diameter x 2.5 cm in length. Scientists on board the JOIDES Resolution often find it convenient to heat/cool a batch of specimens in the TSD-1 while measuring a second batch on the cryogenic magnetometer and vice versa, thereby speeding up the processing of data on thermally demagnetized samples. TSD-1 Operation ProceduresPlace samples on the quartz tray aligned in the same orientation and place the tray on the inconel specimen holder. Open the door to the oven on the forward (left) end and gently insert the holder into the oven just far enough so that the door can be closed. Close the door.Depress the white "POWER" button on the control panel and set the desired temperature with the thumbwheel. Depress the red "HEAT" button to begin heating the samples. The "HEAT" button will initially glow and then will cycle when the oven approaches the final temperature. The average rock specimen reaches equilibrium (heated to its center) between 5 and 10 min after the oven reaches its final temperature.Once the specimens have reached thermal equilibrium, open the door and push the boat into the cooling chamber with a fire resistant, nonconductive rod (we use the wooden rod placed in front of the oven on the shelf, but DO NOT leave the rod in the oven). The boat should be pushed in ~1 in beyond the mouth of the cooling chamber. At this point, another boat of specimens may be inserted into the heating chamber if desired. Close the door and activate the cooling blower by pushing the blue "COOL" button. Cooling time is about half of heating time. Note: It is recommended that specimens be moved into the cooling chamber as quickly as possible so as to avoid freezing in undesired remanents.Remove samples after they have been sufficiently cooled.Measure the samples on the SRM and then repeat the process.Caution: NEVER place plastic sample cubes in oven when heating above 200°C. Instead, remove sediment from the cube carefully and wrap in aluminum foil. Sedimentary rocks may explode at high temperatures if they contain water. It is best to dry these samples at a moderate temperature before exposing them to higher temperatures. Do not turn the power off while the samples are still in the oven or cooling chamber, as this may impart spurious magnetizations to the samples. When handling samples, avoid placing hands on the quartz boat if possible. Fingerprints or smudges may cause permanent marks on the quartz when heated. Be sure to engrave orientation arrows into the specimen before heating. Indelible ink will not remain visible at higher temperatures. Global Shipping ProgramIf you are purchasing multiple items that will total over 70 lbs. you will need to separate out the transactions as we cannot separate shipments that go through the eBay Global Shipping Program. If multiple items are purchased at one time and the package is over the weight limit, we will contact you to cancel the order and refund your purchase. Free ReturnsWe have free returns on domestic shipments for 30 days! Please contact us if there are any issues with your purchase. Combined Shipping (domestic)If your buy more than one item with us, you may qualify for a combined shipping discount. If your purchase qualifies, you will be refunded the amount saved for combining shipments.

Price: 29.99 USD

Location: Spokane, Washington

End Time: 2025-01-02T17:19:54.000Z

Shipping Cost: N/A USD