Delivery Contents; Unit Description; Installation - NORGREN 18D-LT x2 Bedienungsanleitung

®
Operation
• Operate the 18D-LT x2 only under the conditions
listed in the specifications and limit value informa-
tion. Failure to do so compromises the operational
reliability and safety of the switch and risks impaired
function or destruction.
• Replace the 18D-LT x2 immediately if malfunctions
occur.
Information about the device's year of manu-
facture: in the five-character date code on the
type plate, the first two characters specify the
decade and the year, with A representing the
years 2000 to 2009 and B representing the
years 2010 to 2019
(example: B0111 ≡ year 2010).
Please note the following special conditions:
The permitted environmental and fluid tem-
perature can be found on the corresponding
technical data sheet.
• It must be ensured that an impermissibly high
device temperature, which can occur during brief
cyclical pressure fluctuations, is prevented.
• If sudden pressure changes and pressure spikes
occur with liquid fluids, an absorption prechamber
must be connected upstream. Order code 0574773.
With a lateral flange (roughness of the flange
surface Rt < 12 mm), the 5 x 1.5 O-ring (order code.
0664098) is part of the delivery. The supporting
thread length is at least 7.5 mm. The maximum
diameter of the pressure connection hole is 3 mm.
• Please note that the connectors must not be dis-
connected under voltage!
3

Delivery contents

Delivery includes:
• 1 18D-LT x2 pressure switch
• 1 equipment socket
• 1 operating manual for the 18D-LT x2
• attachment screws are not included with
delivery
Scale drawing of connection: Inside thread
~84
48
30
B
4,3
27
5
1 Switch A
2 Switch B
08/10
All manuals and user guides at all-guides.com
English
®
4

Unit description

The 18D-LT x2 pressure switch functions as a
switch in signal, control and settling circuits. It
monitors the connected relative pressure and
depending on the model of 18D-LT x2 and the
set switching points or functions converts it to
an analogue current or voltage signal.
5

Installation

CAUTION
X Always ensure that the relevant part of the sy-
stem does not carry live voltage and is not under
pressure before the 18D-LT x2 is connected
pneumatically or electrically.
X The tightening torque for the attachment
screws is 1.6 + 0.4 Nm. Install in the open only
with sufficient protection against critical environ-
mental conditions (such as atmospheres which
are corrosive or contain salt).
Connecting compressed air
CAUTION
X Do not screw in any connection fittings with co-
nical threads! Use only connection fittings which
are axially sealed on the outside flange with a
maximum screw-in depth of 9 mm.
X Construct the counter piece for the plug-in con-
nection with a suitable Thread.
Scale drawing of connection: Flange
70
60
30
A
A B
G1/4
2 1
1 Switch A
2 Switch B
3 O-ring, 5 x 1.5
Subject to change without notice / Page 2
Risk of injury from
uncontrolled operation
If the 18D-LT x2 carries electric
voltage and/or pressure during
installation, uncontrolled
reactions can result which lead
to injuries or damage to the
system.
Damage to the device
The use of incorrect connection
fittings or failure to comply
with limit values can lead to
device damage. Stay within the
limit values for pressure and
temperature (see specifications
data sheet 5.11.006).
~84 70
48 60
30 30
B A
1,2
4,3
3
2
5
Risk of injury from
CAUTION
pressure hoses which
become disconnected
Unsuitable pressure hoses on
the 18D-LT x2 can become
disconnected under pressure,
cause injuries and damage the
18D-LT x2.
X Use only the pressure hoses specified by
Norgren.
Connecting the 18D-LT x2 electrically
• Connect the equipment socket carefully to ensure
safety class IP 65.
Please note the pin assignment.
• Use shielded cables if the 18D-LT x2 is exposed to
strong electromagnetic fields.
Switch function drawings
Switch functions as per DIN EN 175301-803
(DIN 43650) Form A
One single-pin microswitch (converter)
Switch A: NO
Contacts 1 – 2:
With increasing pressure
contact closes
Switch B: NC
Contacts 1 – 3:
With decreasing pressure
contact closes
Switch A: NC
Contacts 1 – 2:
With decreasing pressure
contact closes
Switch B: NO
Contacts 1 – 3:
With increasing pressure
contact closes
Switch A: NC
Contacts 1 – 2:
With decreasing pressure
contact closes
Switch B: NC
Contacts 1 – 3:
With decreasing pressure
contact closes
Switch A: NO
Contacts 1 – 2:
With increasing pressure
contact closes
Switch B: NC
Contacts 1 – 3:
With increasing pressure
contact closes
1
Figure 1
1
A
2
B
3
4
Figure 2
1
2
A
B
3
4
Figure 3
1
2
A
B
3
4
Figure 4
1
2
A
B
3
4
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