MKS HPS 945 Series, Руководство по эксплуатации и обслуживанию

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12
Digital Pirani vacuum Sensor System
Connecting the Sensor to the Controller
A sensor cable with a standard octal socket (see Accessories, p. 24) is
required for operation but is purchased separately from the Pirani System.
This socket has an integrated polarizing tab.
The socket has sufficient contact pressure so that strain relief is
unnecessary in most applications, but when exerting excessive stress on the
cable, use separate strain relief to prevent damage to the Sensor or
Controller. Cables are available in standard lengths of 10, 25, 50, and 100 feet
and in custom lengths up to 500 feet.
Connect the cable to the rear of the Controller at the
Gauge port. Tighten the
connector jackscrews into the mating screw locks to ensure proper electrical
connection and to prevent stress on the connectors.
Turn off the Controller before connecting or disconnecting the
cable from the Sensor or Controller.
Pin 6 of the octal socket is intentionally shorter as a safety
measure. When the cable is connected or disconnected from
the Sensor, this feature prevents a voltage overload on the
Sensor in case the Controller has not been shut off.
However, it is not possible for this preventative feature to always work, so
avoid any possible damage by always turning off the Controller before any
connections are made.
In applications for which special cables are required, i.e., where the
connection must be routed through restrictive barriers or through a conduit,
customize a cable using the figure shown on the following page. Use a D-sub
connector with jackscrews for strain relief in all applications.
AC Power Cord
The Series 945 Pirani System includes a standard, 120 VAC, 50/60 Hz power
cord with a female IEC-320 connector.
If the available power source or connection is different, use only a detachable
cord set with conductors that have a cross-sectional area equal to or greater
than 0.75 mm
2
. The power cable should be approved by a qualified agency
such as VDE, Semko, or SEV.