DIGIVAC 2L760 Instruction Manual Page 4
The instrument should be located in a clean, dry environment for best results. The gauge tube cable should be
identified by wire tags or markings specific to your environment.
Sensors perform best when installed in a thread-down orientation in a clean, dry vacuum system. While
threading the gauge tube into the manifold, the gauge tube cable should be disconnected to avoid damage. In
this way, twisting of the cable and the octal socket on the tube is avoided. Care should be exercised to install the
tubes in a dry part of the system. The gauge tube should be protected against oil and other contaminants by
installing it in such a way to protect it. A good practice is to mount the gauge tube in the most vertically distant
place from oil and other contaminants as applicable. The gauge tube should be mounted in the most stable
pressure region of the vessel to be measured. For example, it would be better to install the gauge tube on a tank
rather than on the pipe that is directly connected to a vacuum pump. In the event of contamination, see section
6.0 for gauge tube cleaning instructions.
The RS232 connection can be made to a PLC or computer via a male DB9 cable connection to the female jack on
the DIGIVAC. The DIGIVAC acts as a DCE, so a straight serial connection is appropriate.
Please use the supplied 5V AC adapter with your instrument. This adapter provides clean short protected power
to protect and insure accuracy of the internal circuitry.
5.0 OPERATION.
After installation, the DIGIVAC is ready for operation. The unit will normally provide accurate readings
immediately.
Make all connections to sensors, and relay outputs with the power disconnected. NEVER DISCONNECT SENSOR
OR OUTPUT WIRES WHILE UNIT IS POWERED UP.
In cases where the system has contaminants, as is often the case with metalizing and coating equipment, it is
often effective to isolate the gauge tube with a solenoid or manual valve during periods when contamination is
most active.
The user can purchase additional options:
•
RS232
–
The instrument puts out a standard RS232 serial stream with settings 9600, 8, N, and 1. The
unit transmits but does not receive, and displays the current vacuum indication in the current units.
•
Analog out
–
This output reads from 0 to 5 Volts from a pressure of 1 Torr to 760 Torr.
•
Relay Control outputs
Units configured with controls will have two set point SPDT relays adjustable with a potentiometer.
Operation:
