OHAUS HB1AL Manuel D'instructions page 7

a d b H o
nalog ry lock eater
high temperature
adjust knob
low temperature
adjust knob
Ohaus Analog 1 Block Heater with modular block and tubes
6
i
Perating nstructions
rocker switch
heat indicator light
These multi-purpose units are ideal for incubation and activation of cultures, enzyme
reactions, immunoassays, melting/boiling points and a wide variety of other laboratory
procedures.
1. Switch the three (3) position rocker power switch from the center off position to
the low range or high range position as desired. The controls are divided into two
separate heating ranges, both thermostats having graduations to assist in setting
the desired temperatures. The left hand 'low temperature adjust' controls from
slightly above ambient to approximately 100°C. The right hand 'high temperature
adjust' controls from approximately 75°C to 150°C.
2. The rocker switch has a center off position and is used to select the desired operating
range. When operating at the point where the two thermostats overlap in temperature
range, the proper thermostat must be chosen for the task being performed. Move
the power switch to the desired operating range and turn the matching range
temperature control knob clockwise to increase the temperature within the range
selected. The heat indicator light will illuminate during the operation of the heater.
3. The temperature may be verified by placing a calibrated thermometer in the test
solution or by insertion in the modular block thermometer well provided. This hole
fits regular glass bulb thermometers or small diameter digital probes. Due to air
currents and radiation losses, the temperature in the test solution will be lower than
the temperature in the block itself. For the most accurate readings a thermometer
should be placed in a sample test tube with solution matching the samples being
tested. If the temperature is too high or too low, adjust clockwise to increase
temperature, counter-clockwise to decrease temperature. Slight adjustments will
usually suffice to correct the temperature setting. When the heat indicator light
flashes on and off intermittently, check the temperature again. Allow sufficient
time for the temperature to stabilize before re-adjusting. This procedure should be
followed until the desired temperature is reached.
EN