Digital Block Heater Single and Double Block Models SBD110 and SBD120
1.0 General Specifications Temperature Range Temperature display resolution Temperature uniformity Temperature accuracy Control Dimensions (W x D x H) / Weight Electrical requirements: SBD100 115V SBD200 230V SBD200 115V SBD200 230V
Ambient +5C to 150C 0.1C 4 digit LED +/-0.2C (at 37C in block) +/-0.3C PI Microprocessor controller 20 x 26.5 x 8.3 cm 2.2 kg 115V, 50/60Hz, 0.8A, Fuse 1.5A 230V, 50/60Hz, 0.63A, Fuse T630mA 115V, 50/60Hz, 1.2A, Fuse 2.0A 230V, 50/60Hz, 1.0A, Fuse T1.0A
2.0 Safety Precautions: ! - Do not use this product in an explosive environment - Do not use in the presence of flammable or combustible material - Do not heat substances that react violently when heated - Do not touch block when hot or when unit is heating. Use block lifter. - Do not touch area around block or block well when unit is hot. - Do not spill liquids into the well area or into the unit side vent holes - Connect unit only to a properly grounded outlet Caution: HOT Surfaces that can burn or cause injury. Use of this product in any manner not specified by the manufacturer or modification of the product may cause injury and/or may void the warranty.
3.0 Installation Upon unpacking the Digital Block Heater inspect for damages. Shipping damage is the responsibility of the carrier. Inspect that the following are present: Users manual, Line cord, Block Lifter. Select a location that is dry and not subject to drafts or moving air from heating or air conditioning vents, or air blown by other equipment. Place the unit on a flat, preferably non-flammable surface. Allow sufficient room around the unit for access and cooling. Six inches minimum on all sides is suggested. Plug the unit into a properly grounded outlet. Using the lifter, insert the block(s) into the well. The unit is now ready for use.
4.0 Controls - On / Off rocker switch. Back of unit. Turns primary power on and off - “Start” LED, red. Illuminates when unit is in heating mode, off in temperature set mode. - “Set” LED, green. Illuminates when unit is in temperature set mode and off when in heating mode. - “Heating”LED, red. Illuminates when unit is in heating mode and unit is actually applying heat to the block. This LED is on continuously during heat-up and cycles on and off when the unit is at the set temperature - “UP” arrow key. Raises set temperature when unit is in set mode. - “Down” arrow key. Lowers set temperature when unit is in set mode - “Start / Stop” key. Switches the unit between set and heating mode.
5.0 Operation Power the unit up with the On / Off switch at the back of the unit. The unit powers up in set mode. Use the UP arrow and DOWN arrow keys to set the temperature to the desired operating temperature. Press the “START” key and the unit will begin heating to the set point.
The unit remembers the last set temperature at power down. However, the “START” key must be pressed to cause the unit to start heating to that set temperature. When first heating up a block, the unit will apply full heat to the block to rapidly increase the temperature. On this initial heat-up the display will show a temperature overshoot and then settle back to the set temperature. The actual block temperature (and sample) however do not overshoot but rise to the set temperature due to the mass and the natural heat lag time of the block. This control method allows for the quickest heat up time without temperature overshoot of the sample. To change temperature set point, press STOP to put the unit back into the temperature set mode then change the set point with the UP and DOWN arrow keys. Press the START key to start heating control again.
6.0 Calibration Calibration allows the unit temperature display to be adjusted or matched to the temperature of a single sample or to a calibrated thermometer making an independent temperature measure of the block. The Digital Block Heater is calibrated at the factory at 37C using a standard small-hole-pattern block. If you are using a block with a high heat loss rate such as a block with large holes or a platform style block, you may choose to recalibrate the unit to your specific application. Also, if you are using very loose or odd shaped vessels, the calibration function can help you match the display temperature to your actual sample temperature. To calibrate the unit for a given block or sample, first turn the unit off using the On / OFF switch. Then place a thermometer of known accuracy* into the block thermometer hole or a thermocouple or other sensor into your sample. Make sure there is a good fit between the thermometer and the block or good contact between any sensor and sample or sensor and block. To calibrate the block or sample to the display, use the following procedure: 1. Press and hold the START – STOP key then simultaneously power up the unit with the On / OFF switch. 2. You should hear a “DU-DU-DU.” sound from the dry bath and the display will have one segment flashing on the left and will show a set temperature. 3. Use the UP and DOWN arrow keys to set the desired temperature at which you want to calibrate the unit. Then press the START key. 4. Allow time (up to 40 or 50 minutes) for the unit to heat up to your set temperature and to equilibrate at this temperature. The entire LED display will start flashing when equilibration is reached. 5. After the entire display has started flashing, read the thermometer (or sensor meter) and use the UP and DOWN arrow keys to adjust the display to the thermometer or sensor reading. Then press the START-STOP key. 6. The unit will then begin to automatically adjust its operating temperature to your original set point with the re-calibration factor included. Allow sufficient time for the unit to re-equilibrate and then again compare the thermometer or sensor reading to the calibrated display. They should closely match. If not, repeat the calibration procedure. * Thermometers used for calibration purposes should have a written calibration certificate and be traceable back to NIST or some other certified body. General lab thermometers are often not accurate enough for calibration work.
7.0 Troubleshooting Guide / Service Problem
Explanation / Solution
Display / LEDs do not light up
1. Check power cord & outlet 2. Check ON / OFF switch 3. Check fuse 4. Call service
Unit not heating
1. Is set point below room temp 2. Is START” LED illuminated 3. Press “START” key 4. Call service
Unit display overshoots set point in heat-up
1. Normal operation. Display overshoots on initial heat-up but block and sample do not overshoot. See Operation section of this manual.
Block or Sample temp not same as display temp.
1. Is unit in heating mode 2. Is unit sitting in draft 3. Check accuracy of thermometer 4. Is thermometer making good contact 5. Follow calibration procedure
8.0 Cleaning and Maintenance Make sure that the dry bath and block are cool and the power cord disconnected before performing any cleaning or maintenance. The dry bath may be cleaned with a moist cloth containing a mild soap solution. Do not immerse the dry bath in water or any liquid. The blocks may also be cleaned in a mild soapy solution. Be sure that all items have thoroughly dried before attempting to connect the cord or use the unit. Spills: In the event liquid is accidentally spilled into the bath or well area, disconnect the plug from the outlet and turn the unit upside down to minimize liquid contact with the internal components. Remove the bottom cover and inspect to assure liquid has not contacted heater elements, electronic controls, or connectors. Have qualified service technician clean the unit and replace any damaged parts.