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The Sample Identification (SID) is a 16-character text string. It can be replaced with the time in
HH:MM:SS by entering 'YES'.
19 3K-AP PRESSURE COMMANDS
This section applies to the CAL3K-AP only which automatic oxygen filling. The performs the following:
1. It fills the vessel from the connected oxygen supply
2. It monitors the filling process to the specified pressure
3. It monitors the pressure during the initial period
4. It monitors the pressure during the main period
5. It records all pressure variables
6. It deflates the vessel
7. It optionally flushes the vessel to remove harmful gases
The vessel is filled to about 30bar (3000KPA) and this pressure is monitored with a pressure transducer.
This device needs a zero adjustment after prolonged use and storage. The adjustment must be done
with the lid open.
90
PRESS ZERO ADJST
The pressure is measured with a transducer which has a zero offset of +-1bar. This error can be
eliminated by using this command. The offset can be checked when the lid is open and the 'READ
PRESSURE', CMD=89., it should read ZERO. +-0.2bar. If not use the 'PRESS ZERO ADJ' to set it to zero.
89
READ PRESSURE
The actual vessel pressure is displayed until ESC.
The filling is done up to the filling target pressure. During filling the oxygen flows thru a filter and
restrictor to slow the filling down. The actual vessel pressure may be a little lower than the target
pressure as a combination of the vessel lid flow restrictions and the fill restrictor.
97
PRESS FILL SECND
The filling time is monitored and when it exceeds the limit the operator is warned. The reason for slow
filling could be: Empty oxygen bottle or blocked inlet filter. The filter (and filling restrictor) is a very
unlikely reason for slow filling and the oxygen pressure should be investigated first.
88
PRESS FILL TRGET
An CAL3K_AP command. The filling target is the nominal filling pressure when the filling valve is shut
down. The actual pressure may be 1bar down because of pressure settling. The target should be 30bar.
Lower filling pressures are indicated for powdery substances to reduce scattering of sample material.
The default is 30bar.
DDS CALORIMETERS OPERATIONS MANUAL V1.1
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2022
Digital Data Systems (Pty) Ltd.
CAL3K Advanced Bomb Calorimeters
www.ddscalorimeters.com
Website:
www.ddscalorimeters.com
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