Scientech H410 Vector Manuale Utente Scaricare il pdf (Pagina 27)

CALIBRATION OF ASTRAL CALORIMETERS USING ELECTRIC SUBSTITUTION

HEATING:

For Astral calorimeters 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.

Figure 4

A. Remove the screws holding the calorimeter's ID tag and remove the plate to expose the circuit board as

shown in Figure 4.

B. Connect the calorimeter to the indicator, turn on the power and let the system equilibrate.

C. Connect a DVM to the test points labeled SUB and HTR on the calorimeter circuit board.

D. 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 R

in the calibration data in

the front of the manual. The two should agree within 2%. If not contact Scientech.

E. Remove the DVM. Connect a power supply to the SUB and HTR test points and connect the DVM to

monitor the power supply.

F. Set up the indicator in the Watts Mode and the 10W range for 25 mm calorimeters or the 3W range for

50 mm calorimeters.

G. Apply V

volts, stated in the calibration data you received with the calorimeter, to the substitution

heater.

H. If needed, adjust the calibration trim pot, R4 on the calorimeter circuit board, until W

Watts, from the

calibration data, is displayed by the indicator.

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Scientech H410 Vector Manuale Utente Pagina 27