Specifications

Installation 1-9
SRS Residual Gas Analyzer
2. Power cables:
External 24V power supplies must have a cable with a 9 pin, type D, female
connector on the free end, wired as described in the “ECU- 24VDC power
connector” diagram shown below.
Note: A power cable, with a properly wired, female, DB-9 cable connector, is
provided by SRS with all RGA units that do not include the built-in power module
(Option 02). Attach the connector’s wires to a longer two-wire cable, of similar or
bigger gauge, to make a power cord compatible with the RGA’s power connector.
RGA units with the optional built-in power module (Option 02) are connected
directly to a wall outlet using the three wire power cord provided by SRS.
1 +24VDC
Pin # Voltage
2 +24VDC
3 Ground
4 Ground
5 Ground
6 +24 VDC
7 Ground
8 +24 VDC
9 Ground
12345
6789
Figure 2 ECU 24 VDC Power Connector
3. RS232 cable: A straight through RS232 cable with 9-pin, type D connectors is
needed to connect the IBM compatible PC to the ECU box.
An adapter will be needed if the RS232 port of the computer has a 25 pin Type D
connector.
4. The probe must be installed in the vacuum chamber before the ECU box is mounted
on its flange.