Brooks Instrument SLA7840 - Manual (Page 16)

2-4
Model SLA7840
Section 2 Installation Installation and Operation Manual
X-PR-SLA7800-RT-eng
Part Number: 541B048AAG
August, 2009
e. When installing a controller with 1/4" (m) VCR end fittings and with full
scale flow rates of 10 slpm or greater, be aware that sharp, abrupt angles
in the system piping directly upstream of the device may cause a small
shift in accuracy. If possible, have at least ten pipe diameters of straight
tubing upstream of the controller.
2-10 Electrical Interface (Analog I/O)
The Model SLA7840 RT is controlled using analog 0-5 Vdc signals. The
minimum set of connections which must be made to the Model SLA7840
RT includes +15 Vdc, supply common, and a setpoint signal. The setpoint
signal is supplied as a 0 to 5 Vdc analog signal. All signals are supplied via
the 15-pin D-Connector. Refer to Figures 2-2, 2-3 and 2-4 for connections.
The Model SLA7840 RT electrical interface is designed to facilitate low-
loss, quiet signal connections. Separate returns (commons) are supplied
for the analog setpoint, analog flow signal, and the power supply. These
commons are electrically connected together on the Model SLA7840 RT
PC board.
Voltage I/O Version
• Signal Common
• Signal Output
• +15 Vdc Supply
• Setpoint Input
• Setpoint Common
• Supply Common