Barksdale L2H User Manual
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Installation/Commissioning
DANGER
Only install or uninstall the switch when de-energized (electrically and hydraulically/pneumatically).
Process connection and electrical connection must be carried out by trained or instructed
personnel according to state-of-the-art standards.
The switch must only be installed in systems where the maximum temperature T
max
is not
exceeded (see type label).
WARNING
Be aware of the fact that in case of operation with higher temperatures the casing surface may
become very hot!
Ambient temperature range: –40… +75 °C; max. pressure at sensor: 21 bar
WARNING
In case the temperature falls below or exceeds the permissible temperature limits specified for the
sensor and the permissible ambient temperature, the function of the temperature switch can no
longer be guaranteed and the temperature switch may be damaged.
Check the operation of the switch regularly. If the switch does not work properly, stop operation
immediately!
CAUTION
All standard temperature switches are supplied with conduit threads which must be sealed with
pipe sealant or Teflon tape to prevent moisture entry. The explosion-proof switches have threaded
plugs covering the electrical connection entry.
Threaded plugs must be removed to install the approved electrical connection of your choice.
The capillary system must be installed with care avoiding sharp bends.
Provide protection against damage where needed.
IMPORTANT
The temperature sensing element can be used up to 21 bar. In case of pressures higher than 21
bar the temperature sensing element must be provided with a thermowell suitable for the
respective application.
All temperature switches are tested for proper functioning before they leave the factory.
Electrical Ratings
Micro
switch
Special
Characteristics
Volt AC
50/60 Hz
Ind.
Load
A
Res.
Load
A
Volt DC
Ind.
Load
A
Res.
Load
A
Notes
H
Micro switch with
silver contacts
125
250
480
10
10
3
10
10
3
6
to
24
0.50
0.5
Small hysteresis;
high AC / low DC
loads
M
Micro switch with
silver contacts
125
250
480
10
10
3
10
10
3
12
24
250
5.00
1.00
0.25
15.0
2.0
0.4
Medium hysteresis;
high AC and DC
loads
GH
Micro switch with
gold plated
contacts for low
voltage and low
current
125
1
1
24
1.00
1.00
Small hysteresis
S
Micro switch with
silver contacts
125
250
480
15
15
15
15
15
15
12
24
250
10.00
5.00
0.03
15.0
6.0
0.2
Adjustable
hysteresis
J
Micro switch -
sealed - with
silver contacts
125
250
480
10
10
3
10
10
3
6
to
24
0.50
0.5
Small hysteresis
G…RD
Micro switch with
silver contacts
125
250
480
10
10
10
10
10
10
12
24
250
15.00
10.00
0.20
15.0
15.0
0.3
Manual reset
We recommend gold plated contacts for all applications with low voltage/power.
IMPORTANT
Data only valid for application in non-explosive atmosphere.
We recommend use of a pre-fuse of the maximum current rating from the table above according to the
load switched.
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