Method of reducing the effects of varying environmental conditions in a measuring instrument and measuring instrument using the method

A method of reducing effects of varying environmental conditions on a measuring instrument having a measuring unit, said method comprising:

• thermally insulating said measuring unit such that effects of varying environmental conditions on selected components of said measuring unit are substantially reduced, while allowing dissipated heat generated within said measuring unit to leave said measuring unit;
• and
• controlling a first temperature in said measuring unit by means of a control loop having a temperature sensor and means to influence said first temperature in said measuring unit in such a way that temperatures at locations with selected components are kept substantially constant,
• wherein said step of controlling a first temperature includes:
• directing air to said measuring unit utilizing a fan;
• heating said air directed to said measuring unit;
• and
• measuring the temperature of said heated air and using said measured temperature as an input signal to said control loop.

A measuring instrument that includes a measuring unit having components that are sensitive to varying environmental conditions, said measuring instrument comprising:

• thermal insulation arranged in said measuring instrument so as to substantially the reduce effects of said varying environmental conditions on selected components, and to permit dissipated heat generated within said measuring unit to leave said measuring unit;
• and
• a controller for controlling a first temperature in said measuring unit, said controller having:
• a temperature sensor;
• and
• means to influence said first temperature in such a way that temperatures at locations of said selected components are kept substantially constant,
• wherein said first temperature in said measuring unit is related to an ambient temperature, and
• wherein said first temperature is controlled within a range of an order of an expected variation of said ambient temperature.

A measuring instrument that includes a measuring unit having components that are sensitive to varying environmental conditions, said measuring instrument comprising:

• thermal insulation arranged in said measuring instrument so as to substantially reduce effects of said varying environmental conditions on selected components, and to permit dissipated heat generated within said measuring unit to leave said measuring unit;
• and
• a controller for controlling a first temperature in said measuring unit, said controller having:
• a temperature sensor;
• means to influence said first temperature in such a way that temperatures at locations with said selected components are kept substantially constant;
• a fan for directing air to said measuring unit;
• a heater for heating said directed air;
• a temperature sensor for measuring a temperature of said heated air;
• and
• a control loop connected to said temperature sensor and to said heater.

A measuring instrument that includes a measuring unit having components that are sensitive to varying environmental conditions, said measuring instrument comprising:

• thermal insulation arranged in said measuring instrument so as to substantially reduce effects of said varying environmental conditions on selected components, and to permit dissipated heat generated within said measuring unit to leave said measuring unit;
• and
• a controller for controlling a first temperature in said measuring unit, said controller having:
• a temperature sensor;
• and
• means to influence said first temperature in such a way that temperatures at locations with said selected components are kept substantially constant,
• wherein said measuring unit includes:
• a flow cell through which solvent can flow;
• and
• additional means for adapting a solvent inlet temperature of an environment of said flow cell.