34
©
Germann Instruments, Inc.
Test Smart – Build Right
©
14.
Remarks on proper operation of the Proove’it
©
Unit
As a general rule, the current running from one channel’s red jack of the Power Supply Unit has to run
back through the same channel’s black jack.
Also, the unit will suffer irreversible damage if the cords from one channel are short-circuited or cross-
circuited between different channels.
The voltage for the power supply can be 110 V-AC or 220 V-AC. The unit itself will sense the voltage and
no adjustment has to be made by the operator.
The fuse for the AC line (mains) voltage is located on the back panel adjacent to the power cord
receptacle. The fuse rating is 4 amps at 250 V-AC. It is a slow-blow T4A/250V, 5 mm x 20 mm fuse. Other
internal fuses can only be replaced by personnel of Germann Instruments.
For proper operation:
-
Make sure the cell containing the concrete sample and the solutions is watertight before testing.
-
Make sure the exterior of the cell is dry.
-
The power supply is turned off when connecting or disconnecting.
-
Connect the red jack from one channel to the red terminal of the cell with the red cord. Similarly,
connect the same channels black jack to the black terminal of the cell with the black cord.
-
Never place the cell on top of the Power Supply Unit.
-
Never place the Power Supply Unit or the cells on a grounded steel table (
See figure 14
).
-
Always place an insulation material between the cell or Power Supply Unit and the table being
used, e.g. a heavy plastic sheet or a dry wooden plate.
-
Once all the connections have been made, check the connections again as instructed above, and
then turn on the Power Supply Unit.
-
Never touch the cords during testing.
-
If the testing has to be interrupted, first turn off the Power Supply Unit and then disconnect the
cords.
NOTES:
The
black jack
on each channel is
not a common ground.
Each channel
of the Power Supply
Unit is an
individual channel,
never cross-connect the channels.
Connection and disconnection of the cords has always to be made with the Power Supply Unit
turned
off.
