Table of Contents
Advertisement
5.4 Pneumatic Switching Facility Connection
These instructions apply to the SHLD 2 source holders with a pneumatic
switching mechanism. Optional position switches signal the switching status of
the source holder. Using position switches is recommended. They give reliable
feedback and indicate if the switching mechanism has really reacted to the
pneumatic switching impulse.
Do not connect the position switches unless there is a complete
absence of line voltage.
!
If over-voltage surges are expected, install over-voltage arresters.
CAUTION
Potential Equalization
The terminal box of the position switches is mounted on the pneumatic switching
mechanism. In the terminal box, you can connect a signal line for a PLC/DCS to
the terminals.
Connect the position switches according to Figure 5.1. Take note of the general
installation regulations. As a rule, connect the SHLD 2 to vessel ground (PA), or in
case of plastic vessels, to the next ground available. Inside the housing there is a
ground terminal. On the outside of the lower housing part, there is an additional
hole for a grounding screw. This connection drains off electrostatic charges.
Connection Cable
The instrument is connected with standard two-wire cable without screen.
Use cable with round cross-section. A cable outer diameter of 5 ... 10 mm (0.2 ...
0.39 in) ensures the cable gland is sealed. If you are using cable with a different
diameter or cross-section, exchange the seal or use a suitable cable gland.
As an alternative you can insert the connection cable with conduit pipe connections.
63138-US-200110
47
Advertisement
Table of Contents
