
Instruction Manual MM850432 ed. 05c
28
R
Replay
:
This symbol appears on display when the simulation of data function is active
3.3 Power
supply
MicroCal 20
can be powered from:
internal rechargeable Ni-MH battery.
External battery charger, supplied as a standard accessory (the batteries must be installed).
WARNING
F
OR THE
IS
MODELS USE THE EXTERNAL BATTERY CHARGER IN SAFE ZONE
ONLY
The Ni-MH rechargeable batteries allows a long time operation and do not need maintenance. The same batteries power both the instrument and the external pressure modules.
Battery life (typical):
10 h (8 h on IS models) on Tc and mV input/output (backlight Off)
4 h (3 h on IS models( with 20 mA simulation (backlight Off)
Recharging time (typical): 5 h (8 h on IS models) at 90% and 6 h (10 h on IS models) at 99% with instrument switched off.
During operation a fully battery symbol “
≠
” will be displayed on the display. This symbol means that the batteries are completely full. When the batteries will be discharged the symbol
“
–
” will appear and the instrument still has about 20 minutes operation capability to end the running analysis.
The battery symbol indicates that a full charge is required. Use only the dedicated battery charger supplied by Eurotron together the instrument.
CAUTION:
O
LD BATTERIES CAN LEAK AND CAUSE CORROSION
.
N
EVER LEAVE RUN DOWN BATTERIES IN THE INSTRUMENT
WARNING
T
HE INSTRUMENT IS SHIPPED WITH AN AVERAGE LEVEL OF BATTERY CHARGE
.
A
FTER UNPACKING
,
A FULL CHARGE OF THE BATTERY IS RECOMMENDED
,
BY CONNECTING THE INSTRUMENT TO THE MAIN
LINE THROUGH THE BATTERY CHARGER
(OFF
CONDITION
)
FOR
8/10
HOURS
.
3.4 Electrical
connections
Appropriate extension wires should be used between the thermocouple (or instrument under calibration) and the
MicroCal 20 DPC
unless the thermocouple leads allows direct
connection. Make sure that both thermocouple and compensating cable are connected with the correct polarity.
If in doubt, the polarity of the compensating leads can be checked by connecting a length of lead to the indicator, shortening the free ends of the wires together and noting that the
indicator reading increases when the wire connection is heated. Color codes of compensating cables change in different countries. Check the appropriate table.
For Rtd connection use a cable of adequate gauge to lower the overall input resistance.
The use of a cable with a good resistance balance between conductors is also necessary.