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Hotplate Stirrers | Setup, Operation and Maintenance

User guides specific to the Hotplate Stirrers

Applicable Models:
THS-135
THS-185

 

Electrical

THS-135 Controls

THS-185 Controls

Safety Temperature Setting

External Temperature Sensor

Countdown Timer (THS-185 only)

Maintenance

 

Electrical

The hotplate stirrer requires a 10amp, 230V, 50Hz power supply. Use a dedicated outlet for the hotplate stirrer, and avoid using power boards or extension cords. Each hotplate stirrer is supplied with a standard 3-pin moulded plug for connection to the mains.

Power Supply:

  • The hotplate stirrer comes with a 2.5m removable mains power lead, featuring a three-pin plug and a female IEC plug. Ensure the hotplate stirrer is positioned at a reasonable distance from the power supply.

  • The hotplate stirrer itself has a male IEC socket.

 

 

THS-135 Controls

  • Knob for Temperature Setting

    • Adjust the temperature by rotating the knob.
    • Start or stop heating by pressing the knob.

  • Knob for Speed Setting

    • Adjust the stirring speed by rotating the knob.
    • Start or stop stirring by pressing the knob.

  • Knob for Safety Temperature Setting

    • Rotate the knob to set the safety temperature.
    • If the heating temperature exceeds the safety temperature, the machine will automatically stop heating.

  • Temperature Display

    • During heating, displays the target temperature and the actual temperature alternately.
    • Displays "OFF" when heating stops.

  • Speed Display

    • During stirring, displays the target speed and the actual speed alternately.
    • Displays "OFF" when stirring stops.

  • Safety Temperature Display

    • When setting the safety temperature:
      • The first 4 digits display "SAFE."
      • The last 4 digits display the temperature value.

  • Heating Indicator

    • Illuminates when heating is active.

  • External Temperature Sensor Indicator

    • Lights up when the external temperature sensor is connected.
    • The LED displays the temperature measured by the external sensor.
    • If disconnected, the internal temperature sensor value is displayed.

  • Setting Indicator

    • Flashes when adjusting the temperature or speed settings.

  • Power Switch

    • Used to switch the device on or off.

THS-185 Controls

  • Knob for Temperature Setting

    • Rotate the knob to set the temperature.
    • Press the knob to start or stop heating.

  • Knob for Speed Setting

    • Rotate the knob to adjust the stirring speed.
    • Press the knob to start or stop stirring.

  • Knob for Safety Temperature Setting

    • Rotate the knob to set the safety temperature.
    • The device will stop heating automatically if the heating temperature exceeds the safety temperature.

  • Temperature Display

    • Displays the target temperature and the actual temperature alternately during heating.
    • Displays "OFF" when heating stops.

  • Time Display

    • Shows the set time during operation.
    • Displays "OFF" when the timer stops.

  • Speed Display

    • Displays the target speed and the actual speed alternately during stirring.
    • Displays "OFF" when stirring stops.

  • Key to Decrease the Timing

    • Use this key to reduce the set time.

  • Timer

    • Turn the timer on or off.

  • Key to Increase the Timing

    • Use this key to increase the set time.

  • Heating Indicator

    • Lights up when the unit is heating.

  • External Temperature Sensor Indicator

    • Lights up when the external temperature sensor is connected.
    • Displays the temperature measured by the external sensor.
    • If the sensor is disconnected, the internal temperature sensor reading is displayed.

  • Setting Indicator

    • Flashes when adjusting the temperature or speed settings.

  • Power Switch

    • Switches the device on or off.

 

Safety Temperature Setting

Safety Temperature Setting

  • The hotplate stirrer includes a safety (maximum) temperature setting.
  • This setting can be adjusted using the provided screwdriver through the designated hole next to the power on/off switch.
  • While adjusting, the display will show the word SAFE, along with the current safety setting.

Temperature Setting

  1. Adjust the temperature by rotating the temperature setting knob.
  2. The LED will alternate between displaying the target temperature and the current temperature when heating.
  3. Switch the heating on/off by pressing the temperature setting knob.
  4. When powered on, the set temperature from the last operation will be displayed.

Important Notes:

  • Variations may occur between the set temperature and the actual temperature due to:
    • Differences between the hotplate’s centre and outer edge.
    • The properties of the sample and container used.

Residual Heat Warning (HOT)

  • The instrument features a residual heat warning to help prevent burns.
  • If the hotplate temperature exceeds 50°C, the display will flash "HOT" as a safety warning.
  • The instrument will automatically power off once the hotplate temperature drops below 50°C.
  • Note: This function is only active when the power cord is connected. If disconnected, the residual heat warning will not operate.

Stirring Function

  1. Turn stirring on/off by pressing the speed control knob.
  2. Adjust the stirring speed (range: 50–1500 rpm) by rotating the knob.
  3. When powered on, the display will show the stirring speed from the last operation.

External Temperature Sensor

Both models of the hotplate stirrer come equipped with a PT1000 external sensor as a standard feature.

  • When the sensor is connected:

    • The sensor indicator will illuminate.
    • The unit will operate in PT1000 mode, displaying the temperature of the external sensor and the actual measured temperature.

  • Usage Instructions:

    • Insert the external sensor directly into the sample to ensure accurate temperature readings.
    • An optional stand and clamp are available for securing the sensor during operation (as shown in the figure above).

 

Countdown Timer (THS-185 only)

The THS-185 hotplate stirrer is equipped with a built-in countdown timer as a standard feature.

  • Activating the Timer:

    • Press the timer button to activate the countdown timer.
    • Hold the timer button for approximately three seconds until the value starts flashing, allowing you to adjust it.

  • Adjusting the Timer:

    • Use the controls to set the desired time.
    • While in edit mode, press the timer button again to toggle between minutes and hours.

  • Operation:

    • Once the timer is set, the flashing will stop after a few seconds.
    • The display will automatically begin counting down.

 

Maintenance

Cleaning Instructions

  • Clean with a soft cloth and soapy water as needed. Avoid abrasive cleaners or scouring pads, as they may scratch the surface and cause corrosion. Do not use caustic cleaning agents.

  • Electrical Components: Do not expose any electrical parts to moisture.

Cleaning Stainless Steel

Stainless steel is generally resistant to corrosion, but some chemicals and a lack of oxygen can cause rust or pitting. When routine cleaning, avoid deionized water and use water that meets the suggested quality requirements in the water quality section. Use a damp cloth for everyday cleaning, and avoid harsh chemicals.