DDS CALORIMETERS OPERATIONS MANUAL V1.1
2022
Website:
www.ddscalorimeters.com
55
Digital Data Systems (Pty) Ltd.
CAL3K Advanced Bomb Calorimeters
www.ddscalorimeters.com
16 FIRING VOLTAGE 1
The firing voltage is default set at 25.0 volts. The setting depends on the sample and the oxygen
pressure.
The firing voltage must be decreased if the ‘semi-permanent’ firing wire melts too often. You should get
20 to 50 firings out of the wire depending on how corrosive the sample is.
17
FIRE MANUALY
1
This can be used to shorten the initial period. The firing conditions are circumvented and the Vessel
charge is ignited. It is useful to test the firing/ignition procedure. It is not recommended for use during
normal operation, as this will affect the accuracy of your sample being determined.
18 BENZOIC ACID VAL 1
This is the Benzoic Acid value in the specified units! See CMD=22 for specifying the units. The default
entry is 26.454KJ/g.
19 CALIBRATION 0
Prepare the vessel with Benzoic Acid (BA) and set the calibration on (YES).
Then close the LID and wait. You will notice that the calibration operation is indicated in the top left
corner. Once done, remove the vessel and repeat the procedure with the other vessels
(Except CAL3K-S)
which only has one vessel.
20 SIMULATION 0
This is a service command. It allows checking out the complete calorific determination but 6 times faster
without oxygen or balance. See: DEMO (CMD=108) for the slowed down version.
Note:
The simulated result is entered in to memory, but is suitable flagged.
21 MISFIRE LIMIT 1
If the sample is not igniting then it is called a misfire. The unit checks the temperature rise 30 seconds
after firing, and if the rise is below the limit a misfire is declared and the process is terminated. The
default value is 0.44C. The misfire limit checking can be disabled by entering zero.
22 UNIT: KJ,KCA,KBU 1
This command sets the measuring units. Note that the internal working are in KJ/g, but any output is
converted to the units. Enter:
KJ
KJ/g, MJ/Kg
KCA
KCAL/g
KBU
KBTU/lb
Enter the letters:
KJ
for KJ/g
KCA for KCAL/g
KBU for KBTU/lb
The following conversion applies:
1KJ/g
=
429.9226
BTU/lb
=
0.4299226
KBTU/lb
1KJ/g
=
0.2388459
KCAL/g
Therefore: The 26.454KJ/g =
11.373 KBTU/lb
=
6.3184 KCAL/g
