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Clarkson Price: This item has been discontinued by the manufacturer
Clarkson Catalog Number: H3505-HS20
Manufacturer: Torrey Pines Scientific
Supplier Catalog Number: HS20

Clarkson H3505-HS20
DigiLog Stirring Hot Plate 115VAC Stirs from 100 to 1500 rpm. Has solid ceramic glass top and heats to 450C.
Torrey Pines Scientific HS20
Also available at the same price:
HS20-1 DigiLog Stirring Hot Plate, 100VAC
HS20-2 DigiLog Stirring Hot Plate, 230VAC
Product Description:
The new Digilog series represents state of the art electronic technology applied to simple hot plates and stirrers. 
In effect, these units are hybrids of analog and digital units combining features of both to make reliable, easy to use units that are priced like simple analog units. 

All are UL, CSA and CE compliant.

Digital Features

  • 3-digit display of heater power as a percent of total range for easy resetting.  No need to mark the heater knob or front panel.
  • Membrane keyboard setting of all parameters.  Easy scroll up or down settings.  No mechanical controls at all!
  • Two memory keys for saving your 2 favorite combinations of temperature and stirring speed for one button instant recall at any time.
  • “Plate Hot” red LED illuminates when plate temperature goes above 50°C and stays lit when the plate is hot even after the unit is turned off.  A really nice safety feature.
  • Main power ON/OFF button on the front panel for easy, safe access. 
  • Prior settings are retained when the unit is turned off and the unit will return to those settings automatically when turned on again.
  • Indicator lights and ON/OFF buttons for heater and stirrer power.  Turn either off with a single button.  Turn on again and the prior settings remain.
  • Heater power regulated even through changes in line voltage.  Heater temperature stays much more stable than standard analog units.
  • Low plate temperature settings as low as 30ºC.
  • Heater drive software written to go up to setting quickly.  Reduced heating times.

Analog Features

  • Inexpensive price.  These units cost less than most strictly analog units.
  • Compact size.  They are 10” (25.4cm) deep by 7” (17.78cm) wide by 4.5” (11.43cm) high.
  • Ruggedness.  Will support over 30 pounds (66.6kg).
  • Simple to use.  Scroll up and scroll down settings.
  • Simple to service if needed. Service by anyone.  No special training required.
  • Fused AC input line.

Three models of DigiLog units are available: a hot plate Model HP20, a stirrer Model ST20 and a stirring hot plate Model HS20. 
All use the same compact, rugged cast aluminum chassis that is designed to keep spills out of the case.
All controls are mounted forward of the heater plate for safety.  All electronic controls are on one simple PC board, and all controls have red indicator LED’s that illuminate when activated. 

The stirrer features a circular disk magnet capable of lifting 20 pounds (9kg) coupled to a strong stirrer motor, making these units capable of stirring 2 liters of aqueous solution. 
The stirrer range is from 100 to 1500rpm.

The heating units, Models HS20 and HP20, will heat to 450°C in less than 5 minutes using just 400 watts of heating power.  
The heater is set using a digital display and UP/DOWN arrows to set the heater power in percentage of full power in 1% increments. 
The lowest setting is below 30°C on a setting of 1%.  The 50% setting is roughly one half of 450°C or about 250°C when the ambient room temperature is added. 
This type of control and indicator is not designed to give an exact temperature setting, just an easily repeated setting. 
Once the temperature reaches its set point, it will hold that temperature within ±2.0°C. 

There are two MEM (memory) keys on each unit, MEM1 and MEM2. 
Two frequently used heating/stirring combinations may be saved in memory. 
Simply set the stirrer and heater to those settings and then push and hold the MEM1 or MEM2 key depressed until the beep sounds.  Those settings are saved to memory. 
The next time that sample is run, just place it on the unit and touch the memory key.  The previously set heat and stir values will be run automatically.

Product Specification:

Hot Plate:
Solid ceramic top  
Maximum temperature of the plate surface 450°C
Time to maximum temperature, unloaded under 5 minutes
Temperature control ±2.0°C
Heater power, watts 400 watts


Speed range unloaded 100 to 1500 rpm
Maximum load, aqueous 2 liters
Magnet strength 20 pounds
Weight capacity on heater surface 35 pounds (15.75kg)


Operating voltages available 100, 115, 230VAC
Power consumption:
HP20 and HS20 . . . . . . . . . .
ST20 . . . . . . . . . . . . . . . . .

450 watts
35 watts
Current Draw 100/115VAC: 3.5A
230VAC: 1.8A


Unit size 10"(25.4cm) deep
7" (17.78cm) wide
4.5" (11.43cm) tall
Unit Weight, unpacked
ST20 and HS20 . . . . . . . . . .
HP20 . . . . . . . . . . . . . . . . . .

7 pounds (3.15kg)
6 pounds (2.7kg)
Unit Weight, packed
ST20 and HS20 . . . . . . . . . .
HP20 . . . . . . . . . . . . . . . . . .

8 pounds (3.6kg)
7 pounds(3.15kg)

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