Brooks Instrument SLA5840 - Manual (Page 16)

2-4
Brooks ® Model SLA5840
Section 2 Installation Installation and Operation Manual
X-PR-SLA5800-RT-eng
Part Number: 541B120AAG
August, 2009
2-9 Electrical Interface
The Delta Class EL Series RT's are controlled using analog 0-5 Vdc
signals. For an analog unit the minimum set of connections which must be
made to the RT include +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.
The Delta Class EL Series 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 PC board.
Voltage I/O Version
• Chassis Ground
• Signal Common
• Signal Output
• +15 Vdc Supply
• Setpoint Input
• Setpoint Common
• Supply Common
For a DeviceNet unit, 11-25 Vdc power and communication I/O are
supplied via the standard 5-PIN Circular Micro-Connector.
2-10 Operation Check Procedure
a. Mount the RT in its final orientation.
b. Apply power to the RT and allow approximately 45 minutes for the
instrument to completely warm up and stabilize its temperature.
c. Make sure the RT is set for flow mode.
d. Do NOT supply gas to the RT. Ensure that the differential pressure
across the RT is zero.
e. Check the RT zero.
f. The analog output signal should be 0.000 Vdc ± 0.2%. If the zero
exceeds one of these limits, follow the re-zeroing procedure in Section 3-4.
g. Turn on the gas supply. A positive flow signal may be present due to
slight valve leak-thru (RT only).
h. Supply a setpoint signal between 1 and 5 Vdc.
i. Check the analog output signal. The output signal should match the
setpoint voltage (± 10mV) within 10 seconds after the setpoint is
changed.