DDS Calorimeters CAL3K Series Operation Manual page 69

98 PRESS FILL LOSS
This command applies to the CAL3KAP. The pressure filling loss is measured from just before firing to
the end of the main period. It should be less than 2bar. If it is more than the vessel leaked when the
pressure peaked after firing to approx. 60bar. The filling loss checking is disabled by entering ZERO. The
default is ZERO.
99 PRESS LEAK TEST
An CAL3K-AP command. This command sets the leak test pressure applied during SYSTEM LEAK TEST,
CMD=94. The leak test is useful when a leak is suspected. The default value is 25bar.
100 PRT CALCUL. DATA
After a determination a complete data set is available for printing. These data are important for the
engineer and have no use for the customer.
101 PRT PRESS. RECRD
An CAL3K-AP command. This command prints all (Max 16) pressure recordings which are caused by
either:
Exceeding the PRESS PEAK LIMIT
Exceeding the internal max pressure setting 90bar
The pressure recordings can be reset by CLEAR PRESS RCRD, CMD=38. The records can be read out on
the display with CMD=115 and a junk record can be simulated with CMD=126.
102 LOW AMBIENT LIMT
The ambient temperature affects the unit's operation and result. The result influence can be eliminated
by calibrating the unit at low ambient temperatures. The default setting is 8C. The lowest possible
temperature measurement is 2C.
103 HIGH AMBIENT LIM
The unit measures the Ambient temperature, which has an influence on the result and the operation.
The influence is mitigated by calibrating the unit at relatively high ambient temperatures. However, this
limit can be set up to warn the operator. The default setting is 36C.
104 LOW RISE LIMIT
The temperature rise after firing should be 12C+-2C. This can be managed by adjusting the sample mass.
A limit can be set up to warn the operator that the sample mass was too low. The default setting is 8C. A
lower rise can be achieved by calibrating the unit to an 8C+-2C. It is just difficult to split a Benzoic Acid
tablet to 2/3.
105 HIGH RISE LIMIT
The result is affected by the temperature rise after firing. This affect is minimised by calibrating the unit
for high rise (e.g., 0.75g Benzoic Acid). However, the sample mass should be adjusted so that the
temperature rise is near to the optimal 12C +-2C. The default setting is 16C.
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 64