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BT37 MarkII: Service Manual MA200606 1.0.0
Introduction
1 Introduction
1.1 About the equipment
1.1.1
Theory of operation
The basic principle of operation is illustrated in the diagram below.
Samples are placed in dishes in the left and right chambers which are heated to
maintain a constant temperature. Pre-mixed gas is supplied from a pressurised cylinder,
bubbled through water contained in the humidifier bottle, and then passed to the left and
right chambers. This results in the samples being maintained at a controlled temperature
and within a controlled atmosphere.
If the lids are opened and then shut again, gas is provided at an increased flow rate to
reduce the time taken to restore the chambers back to the required gas concentration.
The BT37 can be in one of three modes: Standby, Run and Bottle change.
Mode Heaters Gas Note
Standby Off Off The system is
inactive and ready to
be switched off.
Bottle change On Off The system is
waiting for the
humidifier to be
changed.
Run Controlled Controlled This is the normal
operating state.
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