Benchmark BSH1001 Digital Dry Bath User Manual

Digital Dry Bath II, models BSH1001, BSH1002 and BSH1004
Users Manual

Benchmark’s Digital Dry Baths are highly accurate, microprocessor controlled, dry block heating units capable of heating one, two or four aluminum blocks or aluminum or glass pans. They provide unsurpassed temperature uniformity and accuracy for heating microtubes, test tubes and other small vessels, including microplates and slides. Each dry bath has a bright green LED display, easy to set temperature and time controls and comes complete with a block lifter.

SPECIFICATIONS

increments
Size wxdxh (in.) / Weight|  7.9×9.1×3.2  (2.2kg)|  8.7×10.7×3.2 (2.5kg)| 8.7×14.3×3.2  (3.5kg)
Electrical 115/230VAC 50/60Hz| 100 watts|  150 watts| 300 watts

CAUTION: Hot surfaces, especially on the block, can cause serious injury or burns.
CAUTION: Do not put water or liquids into the well as shock, serious injury and death my occur.
CAUTION: Do not heat flammable or explosive substances as serious injury and death may occur.

SET UP and OPERATION

Place the dry bath on a stable, flat surface away from air vents and any equipment exhaust vents. Plug the dry bath into a properly grounded outlet of the correct voltage. Insert the block(s) into the heating well using the block lifter. Caution: blocks may be hot! Using the switch on the back of the unit, turn the power on. The dry bath will make a “beep” sound, illuminate each digit on the display left to right and briefly illuminate the LED lamps while it performs a unit test. After the unit test, the display will begin showing the block temperature and the unit will begin heating the block to the previously set temperature and flashing the Heating lamp.

Setting the Temperature

Use the Up and Down arrow buttons to increase or decrease the temperature setting. The temperature can be set in tenths of a degree C. Once the temperature is set, the display will then revert to showing the block temperature and the Heating lamp will flash until the set temperature has been reached. The temperature setting is automatically remembered if power is turned off or if the power is lost.

Using and Setting the Timer

The dry bath has a built-in, independent, digital timer function that sounds a “beeping” alarm when the set time has been reached. The timer is completely independent of the heating function and does NOT turn off the heater when set time is reached. This allows the Timer to alert the user that the time setting has been reached but does not disturb samples being heated. (continued on next page)

Using and Setting the Timer (cont.)
Press the Mode button to illuminate the Timer Set Mode lamp and place the dry bath into the timer set mode. Use the Up and Down arrow buttons to set the desired time in one minute increments on the display. Once time has been set and after about 3 seconds, the dry bath will make a “beep” sound and automatically begin the timer. The display will revert to showing the block temperature and the red Timer Set Mode lamp will be extinguished. When the display shows the block temperature, pressing the Mode button will cause the display to show how much time remains on the timer in minutes.
When time has expired, the dry bath will briefly sound the “beeping” alarm and flash the red Heating lamp. The display will show a set of characters that represent the word “oVEr”. Sample heating will be unaffected. At this point the user can press the Mode button to start the timed cycle over again or press the Down arrow button to cause the display to show the current block temperature without re-starting the timer.
It is best to allow the dry bath to first reach the desired temperature before setting and using the timer function. Because the timer does not affect sample heating, it can only be used as a general purpose timer including timing of other lab activities. The timer setting is automatically remembered if unit power is turned off or if power is lost.

User Calibration Function

The dry baths are calibrated at the factory and are highly accurate. The dry baths also have a user calibration feature which allows users to fine adjust the dry bath display to match certified lab reference thermometers or reference temperature sensing meters. Adjusting unit calibration should only be attempted using certified thermometers or temperature sensors with accuracy certificates. Use the following procedure to calibrate the dry bath:

1. The unit must be off. Press and hold down the Mode button. While holding down the Mode button, turn the unit on using the power switch at the back.
2. The display will step through the digits and then show the current temperature setting with the right hand digit flashing. Release the Mode button after the right hand digit begins flashing.
3.  Set the temperature to the desired calibration temperature using the Up and Down buttons.
4. Press and release the Mode button. The unit will start heating to the set calibration temperature.
5. Allow 45 minutes for the dry bath to equilibrate at the set calibration temperature. The right hand digit will begin flashing again when the dry bath has equilibrated at the calibration temperature.
6. After the display begins flashing, use a certified reference thermometer or temperature sensor to check the block or sample temperature. If the reference thermometer shows a difference from the display, you can adjust the display to match the thermometer by using the Up and Down buttons.
7. After using the reference thermometer and adjusting the display if necessary, press the Mode button to exit the calibration mode. The dry bath will then be calibrated to the reference thermometer at the selected temperature point and ready for operation.

ERR Code on the display
If the dry bath temperature sensor is shorted or senses an ambient temperature below 0C, the display will show the error code ERR.
Warranty: The dry bath comes with a 2-year warranty.

www.BenchmarkScientific.com 908-769-5555 Rev. 8-10

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