Optional Air Purge; Electrical Connections - Hach CL17 Instrument Manual

Section 1
!
1.7

Optional Air Purge

!
1.8

Electrical Connections

Figure 7 Location of Air Purge and Electrical Connections
Intended for wiring relays.
Use sealing type fittings.
(Optional Air Purge Connection)
Network and 4-20 mA Connections
Use sealing type fittings.
Power Connections
Use sealing type fittings.
Page 20
Optional Air Purge
Air purge may be necessary if the analyzer is located in an environment with
high humidity and/or caustic vapors. The goal is to maintain a slight positive
pressure in the instrument with dry instrument air.
The air purge connection is located on the left side of the instrument
enclosure. To connect an air supply, remove the plug in the quick connect
fitting then connect ¼-inch poly tubing by pushing the tubing into the fitting.
Two distinct "stops" will be felt as the tubing is correctly attached. If the tubing
is not properly seated, it will come loose when air pressure is applied. Use
only dry, oil-free instrument air at 15 scfh.
All power connections are made through the conduit openings in the upper left
side of the instrument. The instrument is shipped with plugs in all of the
conduit openings. Wire the instrument for power, alarms, and relay
connections using sealing-type conduit fittings, to maintain the IP62
environmental rating.
If connections are not made through a conduit opening, install an oil-tight seal
in place of the plugs to maintain the IEC 529 IP62 rating. See
Accessories on page 67.
Optional
If relay connections are not
made, an Oil-tight seal
(Cat. No. 42210-00), must be
installed to maintain the
IEC 529 IP62 rating.
54400_install.fm