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BT37 MarkII: Service Manual MA200606 1.0.0
Operation
1. From the main display, click Menu.
2. Select Set access code.
3. When prompted, enter the current access code. The default is 00000.
4. At the Enter access code screen, enter the new access code.
5. Select Display mode to return to the main screen.
2.2 Changing the control settings
The control settings will normally only need to be adjusted when the BT37 is first
installed. The default chamber temperature is 37.0 °C. The flow rates should not
normally be adjusted from their default settings.
1. From the main display, click Menu.
2. Select Configuration.
3. When prompted, enter your access code.
4. At the Select group to adjust screen, select Control settings.
5. Select from the following options to change the control settings:
Left temp C Adjust the left-hand chamber temperature.
Default 37.0 °C.
Right temp C Adjust the right-hand chamber temperature.
Default 37.0 °C.
Bleed on time s See Gas flow for details of these
settings.
Bleed off time s See Gas flow for details of these
settings.
Purge duration s See Gas flow for details of these
settings.
Extended purge duration s See Gas flow for details of these
settings.
Non-pulsed flow mL/min See Gas flow for details of these
settings.
Important
After changing any parameters, use the main display to check the setpoints are
correct. From the main screen you can keep pressing Display until the setpoints are
displayed.
2.2.1
Gas flow
The gas flow to the chamber can be in one of four states: off, bleed flow, purge flow,
extended purge.
The gas flow is only off when in standby or bottle change mode.
Bleed flow is the default flow condition and provides the background gas flow required
to maintain the gas concentration in the chambers. Bleed flow provides gas at a low
background rate but can operate in two modes: non-pulsed and pulsed .
Purge flow provides gas at a higher rate, factory set to 360 mL/min, for a length of time
defined by the Purge duration s setting. The default duration is 180 seconds. Purge
flow only occurs when both lids are shut and starts when the lids are closed. The flow
then returns to bleed flow.
Extended purge flow provides gas at the same flow as the normal purge flow but for an
extended duration defined by the Extended purge duration s setting. The default
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