sensor. Note the use of shielded wiring and that the shield is connected at one end only. Counter 2 is
shown connected to an external turbine meter pre-amplifier.
When connecting to a turbine meter amplifier the manufacturer may have a specific current
requirement to power the pre-amplifier. The SCADAPack LP includes a 1000-ohm resistor from the
counter input to the DC input power source. This is the recommended wiring for a Halliburton Low
Power Pre-Amp when the SCADAPack LP is powered from 12V. If this resistor is not suitable for
your external amplifier then do not connect the jumper in either position. On Counter 1, the J11
jumper would be removed. On Counter 2, the J12 jumper would be removed. Wire the amplifier as
per the manufacturers recommendations.
Counter Inputs 1 and 2 can be used with conventional sources such as open collector transistors and
contacts. The SCADAPack LP includes a 1000-ohm resistor from the counter input to the DC input
power source. This resistor can be used when the SCADAPack LP is powered from 12V. On
Counter 1, J11 would be in the External Amplifier or bottom position. On Counter 2, J12 would be
in the External Amplifier or bottom position. If a higher voltage is used or a pullup current other than
12V at 1000-ohms is required then the user must wire an external resistor to an appropriate power
source. On Counter 1, the J11 jumper would be removed. On Counter 2, the J12 jumper would be
removed.
J9 J11
Internal
amplifier
To counter 1
Counter 1 input
Internal 1000
ohms connected
to Input Voltage
J10 J12
Internal
amplifier
To counter 2 Counter 2 input
Internal 1000
ohms connected
to Input Voltage
12VDC PWR IN
12VDC PWR
Figure 8: Counter Jumpers
SCADAPack LP Hardware Manual
May 26, 2006
23
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