DDS CALORIMETERS OPERATIONS MANUAL V1.1
2022
Website:
www.ddscalorimeters.com
33
Digital Data Systems (Pty) Ltd.
CAL3K Advanced Bomb Calorimeters
www.ddscalorimeters.com
Fibre
4Kcal
16.736KJ
The last item (Fibre) is the interference factor: It burns nicely like the sawdust but….
To compensate for fibres:
25 FIBRE CV VALUE 1
The actual percentage of fibres is entered by:
23 FIBRE IN FOOD % 1
Entering a fibre percentage REDUCES the calorific value of the result.
The ‘FIBRE IN FOOD’ entry is retained. But not used during calibration or BA checks.
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LIMITS
Limits can be applied to warn the operator of possible bad operations. If a limit is violated the result is
flagged accordingly.
103 HIGH AMBIENT LIM 1
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.
102 LOW AMBIENT LIMT 1
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.
105 HIGH RISE LIMIT 1
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.
104 LOW RISE LIMIT 1
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.