21
C
ALORIMETER
O
PERATION
Astral calorimeters are powered up by the indicators. To use an Astral calorimeter alone with a volt meter or
chart recorder, you must apply +/-8VDC to the mini DIN connector as shown below.
Calibration Using Electric Substitution Heating
The electric substitution heating option must be ordered and installed at the factory when the calorimeter is
purchased. It can not be retrofitted to a calorimeter at a later time. To calibrate using electric substitution
heating proceed as follows.
1. Remove the screws holding the calorimeter's ID tag and remove the plate to expose the circuit board.
2. Connect the calorimeter to the indicator, turn on the power and let the system equilibrate.
3. Connect a DVM to the test points labeled SUB and HTR on the calorimeter circuit board.
4. Measure the resistance of the substitution heater making sure to subtract the resistance of the patch cables
from the total resistance measurement. Compare this resistance to Rc in the calibration data in the front of
the manual. The two should agree within 2%. If not contact Scientech.
5. Remove the DVM. Connect a power supply to the SUB and HTR test points and connect the DVM to
monitor the power supply.
6. Set up the indicator in the Watts Mode and the 10W range for 25 mm calorimeters or the 3W range for 50
mm calorimeters.
7. Apply Vh volts, stated in the calibration data you received with the calorimeter, to the substitution heater.
8. If needed, adjust the calibration trimpot, R4 on the calorimeter circuit board, until Wh Watts, from the
calibration data, is displayed by the indicator.
Operation of Astral Calorimeters with a Digital Volt Meter
The calorimeters may be used with any digital volt meter (DVM) capable of reading 5 volts full scale. The
voltage output of the calorimeter is available on pins 6 and 8 as shown above.
1. Connect the output of the calorimeter to the DVM using the adapter cable.
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Содержание Vector S310
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