Barksdale D1T User manual

´ß0Electrical 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
Microswitch
with silver
contacts
125
250
10
10
10
10
6
to
24
0,50
0,5
Small hysteresis;
high AC / low DC
loads
M
Microswitch
with silver
contacts
125
250
10
10
10
10
12
24
250
5,00
1,00
0,25
15,0
2,0
0,4
Medium hysteresis;
high AC and DC
loads
GH
Microswitch
with gold plated
contacts for low
voltage and low
current
125
1
1
24
1,00
1,00
low change-back
values
GM
30
0.1
0.1
30
0,10
0,10
Medium hysteresis
IMPORTANT
480 V AC and 15 A only upon request
We recommend to use a prefuse of the maximum current rating from the table above according
to the load switched.
We recommend gold plated contacts for all intrinsically safe and other applications with low
voltage/power.
Operating life time
Normal expected service life (expressed in the number of cycles over the full adjustment
range) is appr. 1 million for the pressure switch. This may be extended to 2.5 million cycles
max. if only a part of the adjustment range is used (about 20%).
Switch sensor life may also be effected negatively by:
Media not compatible with the wetted materials.
Too high switch cycling speed or more than 20 cycles per minute.
System cycling pressure exceeding the top of the adjustable range.
Operating Instructions
Single/Dual Metal Diaphragm Pressure Switches D1T/D2T
Single/Dual Metal Diaphragm Differential Pressure Switches DPD1T/DPD2T
1Intended Applications..................................................................................................2
2Safety Instructions.......................................................................................................2
3Standards.....................................................................................................................3
4Warranty/Guaranty.......................................................................................................3
5Installation/Commissioning.........................................................................................4
6Maintenance/Cleaning.................................................................................................8
7Technical Data .............................................................................................................9
Barksdale GmbH
Dorn-Assenheimer Straße 27
D-61203 Reichelsheim
Phone: [phone]
Fax: [phone] and 949-113
email: [e-mail]
Internet: www.barksdale.de
1
14
Art. no.: 923-1545
Index L, 26.08.2022
Specifications are subject to
changes without notice!

1Intended Applications
The pressure switches are specifically applied for monitoring and controlling of operations
using maximum and minimum pressures. A micro switch triggers an electrical signal when
minimum or maximum pressure are reached.
DANGER
The switch may only be used in the specified fields of application (see type label).
The temperature has to be within the specified ranges, the pressure values and the
electrical rating must not exceed the values specified.
Observe also the applicable national safety instructions for assembly, commissioning and
operation of the switch.
The switch is not designed to be used as the only safety relevant element in pressurized
systems according to PED 2014/68/EU.
Without special provisions/actions, pressure switches must not be used for combustible
gas or pure hydrogen applications.
2Safety Instructions
The safety instructions are intended to protect the user from dangerous situations and/or
material damage.
In the operating instructions the seriousness of the potential risk is designated by the
following signal words:
DANGER
Refers to imminent danger to men.
Nonobservance may result in fatal injuries.
WARNING
Refers to a recognizable danger.
Nonobservance may result in fatal injuries, and destroy the equipment or plant parts.
CAUTION
Refers to a danger.
Nonobservance may result in light injuries and material damage to the equipment and/or to
the plant.
IMPORTANT
Refers to important information essential to the user.
Disposal
The equipment must be disposed of correctly in accordance with the local
regulations for electric/electronic equipment.
The equipment must not be disposed of with the household garbage!
3Standards
The standards applied during development, manufacture and configuration are listed in the
CE conformity and manufacturer's declaration.
4Warranty/Guaranty
Warranty
Our scope of delivery and services is governed by the legal warranties and warranty
periods.
Terms of guaranty
We guaranty for function and material of the single- / dual- pressure switch under normal
operating and maintenance conditions in accordance with the statutory provisions.
Loss of guaranty
The agreed guaranty period will expire in case of:
changes or modifications to the switch/housing/fitting
incorrect use,
incorrect installation or
incorrect handling or operation contrary to the provisions of these operating
instructions.
No liability is assumed for any damage resulting therefrom, or any consequential damage.
3
2

5Installation/Commissioning
DANGER
Only install or uninstall the switch when deenergized (electrically and
hydraulically/pneumatically).
Pressure 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 pressure Pmax is not
exceeded (see type label).
CAUTION
Alternating pressure - vacuum applications are not authorized in switch types which are
suitable for both vacuum and pressure applications.
WARNING
Pressure peaks and pressure shocks exceeding the maximum operating pressure are
inadmissible.
The maximum operating pressure is the upper final value of the adjustable range or, if
specified, the pressure indicated as maximum operating pressure. Exceeding the max.
operating pressure affects the performance and the life span of the product and may
damage it.
Pressure switches must be mounted vibrationless.
WARNING
Check the switch regularly for functioning.
If the switch does not work properly, stop operation immediately!
IMPORTANT
All pressure switches are tested for proper functioning before they leave the factory. The
factory proof pressures are stated on the type label.
Contact Protection
The micro switches used are normally suitable for both direct and alternating current
operation. Inductive, capacitive and lamp loads may, however, considerably reduce the life
expectancy of a micro switch and, under extreme circumstances, even damage the
contacts.
Depending on the application spark suppression and current limiting is recommended (see
succeeding figures).
Fig. 1: Protection in case of capacitive
loads R1: Protection against
starting current rushes R2,R3:
Protection against high discharge
currents
Fig. 2: Lamp load provided with resistance
in parallel or series connection to
switch of condensators
Fig. 3: Protection in case of continuous
current and inductive load by
recovery diode
Fig. 4: Protection in case of alternating
current and inductive load by RC-
link
5
4
MS
R1
R2
R3
Load
C cable
MS
R
R
MS
MS
U
=
Diod
e
Load
MS
U
C
Load
R

Set point adjustment
IMPORTANT
Factory-Provided: pressure (temperature) switch point setting
We confirm for pressure (temperature) switches that have been factory set the setting will
be detailed on the label name plate.
Warranty is not applicable for any changes that may occur due to transportation or
installation. For critical applications we recommend the setting is checked and re-set if
cecessary after installation and wirding of the pressure (temperature) switch.
In pressure switches, a displacement of the pressure sensing element occurs with a change
in pressure. Following the displacement of the pressure sensing element operates a
microswitch.
Upon delivery of the product, the set points are likely to be found in the middle of the
adjustable range. On request, fix set points may be adjusted by our factory. In this event, the
point will be indicated on the type plate or any separate plate, i = increasing, d = decreasing.
The set point is adjusted by turning the adjustment screw.
IMPORTANT
To reach the adjustment screw for pressure switches with housing, remove the cover (see
Fig. 7 or Fig. 8).
Allow pressure switch to reach the desired switch pressure.
Turn adjustment screw clockwise or counterclockwise to actuate the micro switch.
IMPORTANT
In case of overpressure:
+ –
Counterclockwise rotation: set point increasing
Clockwise rotation: set point decreasing
In case of vacuum:
–+
Counterclockwise rotation: set point decreasing
Clockwise rotation: set point increasing
IMPORTANT
Please consult the wiring diagram for the contact status at atmospheric pressure (see Fig.
5).
IMPORTANT
Particularly important for small pressures!
Set point adjustment must be performed in installation position.
Precise adjustment of set point to actuate on increasing pressure
Lower system pressure to 0 bar.
Increase pressure slowly and check if micro switch is actuated at desired switch
pressure.
If necessary, readjust by turning the adjustment screw
Repeat preceding steps until microswitch operates at desired switch pressure.
Precise adjustment of set point to actuate on decreasing pressure
Increase pressure up to a point clearly above the desired switch pressure (at least,
switch pressure plus max. hysteresis; not above max. operating pressure).
Lower pressure slowly and check if micro switch is actuated at desired switch
pressure.
If necessary, readjust by turning the adjustment screw
Repeat preceding steps until microswitch operates at desired switch pressure.
Following the adjustment of all set points, each set point must be checked and, if
necessary, be readjusted.
IMPORTANT
The adjustment of several set points occurs for each set point as specified above.
Wiring Code for all Types (Contact status at atm. pressure)
at vacuum NC/NO vice versa
Power circuit 
Power circuit 
C = purple
C = brown
NC = blue
NC = orange
NO = red
NO = black
Fig. 5: Wiring Code
7
6
NO
NC
C
NO
NC
C



Use in Hazardous Locations
Pressure switches with T-housing are marked as Ex i intrinsically safe. This switch must be
operated with a certified switch amplifier .
The wiring between switch and Ex i isolation amplifier must meet the local safety
requirements.
The customer must provide for a highly conductive connection between switch and
grounding.
WARNING
With option Ex i: The models having light-alloy (aluminium) enclosures or enclosure parts
must be protected against all impact or friction which can ignite the explosive atmosphere.
Fig. 6: Operation of pressure switches in intrinsically safe areas
6Maintenance/Cleaning
Maintenance
The pressure switch is maintenance free, however, the country specific test intervals for
preventive maintenance in plants, the PED guideline are to be carried out at all times.
Checking the set points lies within the discretion of the user.
Small setpoint drifts may occur during the initial use of the switch (run-in period). To
minimize the setpoint drift we can perform a run-in (ageing) process in our works on
request. Larger or continuing setpoints drifts during the normal use of the switch may
indicate that the measuring system is not used correctly within the specified limits,
exceeding the design criteria or is worn-out. This might lead to metal fatigue of the
measuring system and it therefore should be replaced before an ultimate rupture of the
metal diaphragm might take place. Please consult your supplier or Barksdale directly for
guidelines.
7Technical Data
See data sheet
Dimensions in mm (inch)
Fig. 7: Metal-diaphragm pressure switch type D1T .../D2T ...
9
8
Locking screw ½“ NPT
Locking screw
M20x1.5
2 pieces in scope
of supply
Cable gland M20x1.5
(clamping range ø5 ... 11
mm)
included in consignment
Set screw(s)
beneath the lid
46 (1.81)
90 (3.54)
Process
connection
¼“ NPT
internal
57 (2.24)
95 (3.74)
127 (5)
120 (4.72)
C
Zener barrier type
Switch amplifier NAMUR
Unprotected area
Ex ia area
NO
NC
GRD

Fig. 8 Metal-diaphragm differential pressure switch type DPD1T .../DPD2T ...
Adjustable Ranges Pressure Switch Type DPD1T/DPD2T
Pressure
range code
Adjustable range [bar] *
Differential pressure
Max.
operating
pressure
[bar)
Proof
pressure
[bar]
The resulting
hysteresis is approx.
... bar at the end of
range
Increasing
pressure
Decreasing
pressure
(short term)
H, GH
[bar]
M, GM
[bar]
Overpressur
e
3SS
0.02 …0,2
0.002 … 0.2
0.5
0.7
0.01
0.02
18SS
0.05 …1.2
0.030 … 1.2
3.0
4.0
0.02
0.05
80SS
0.40 …5.4
0.030 … 5.2
8.0
10.7
0.14
0.32
150SS
0.70 …10.2
0.100 … 9.7
15.0
20.0
0.26
0.60
* Static operating pressures up to 28 bar possible. Differential pressure of the adjustable range
must not be exceeded.
Adjustable Ranges Pressure Switch Type D1T/D2T
Pressure
range code
Adjustable range [bar]
Max
operation
pressure
[bar]
Proof
pressure
[bar]
The resulting
hysteresis is
approx. ... bar at the
end of range
Increasing
pressure
Decreasing
pressure
(short
term)
H, GH
[bar]
M, GM
[bar]
Overpressur
e
2SS
0.005 … 0.11
0.001 … 0.110
0.15
0.2
0.004
0.006
3SS
0.012 … 0.20
0.002 … 0.196
0.5
0.7
0.005
0.010
18SS
0.050 … 1.20
0.030 … 1.200
3.0
4.0
0.018
0.040
80SS
0.300 … 5.50
0.030 … 5.300
8.0
10.7
0.110
0.240
150SS
0.500 …10.30
0.100 … 9.900
15.0
20.0
0.190
0.420
Vaccum
3SS
-0.006 …-0.20
-0.002 ...-0.196
0.15
0.2
0.004
0.009
18SS
-0.040 …-1.00
-0.020 …-0.970
0.5
1.0
0.030
0.060
10
Locking screw
M20x1.5
2 pieces in
scope of supply
Cable gland M20x1.5
(clamping range ø5 ... 11
mm)
included in consignment
Set screw(s)
beneath the lid
46 (1.81)
90 (3.54)
Process
connection
1/8“ NPT
internal
(low
pressure)
57 (2.24)
95 (3.74)
127 (5)
159 (6.26)
Locking screw ½“ NPT
Process
connection 1/8“
NPT internal
(high pressure)
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Approval data for Ex i switches D1T, D2T
Approval:
II 1 G
II 1 D
Ex ia IIC Ga
Ex ia IIIC T200100°C Da
Certificate no.:
TÜV 20 ATEX 248753 X, IECEx TUN 21.0002X
Permissible ambient
temperature:
-40 °C < Ta < +75 °C
Electrical data for
intrinsically safe
application:
Ui = 28 V
Ii = 50 mA
Pi = 0,84 W
Li, Ci =negligibly small
Standards applied:
EN IEC 60079-0: 2018, IEC 60079-0:2017,
EN 60079-11: 2012, IEC 60079-11: 2011
Approval data for Ex i switches D1T/DPD1T with ST1, D2T/DPD2T with ST1 and ST3
Approval:
II 1 G
II 1 D
Ex ia IIB Ga
Ex ia IIIC T200100°C Da
Certificate no.:
TÜV 20 ATEX 248753 X, IECEx 21.0002X
Permissible ambient
temperature:
-40 °C < Ta < +75 °C
Electrical data for
intrinsically safe
application:
Ui = 28 V
Ii = 50 mA
Pi = 0,84 W
Li, Ci =negligibly small
Standards applied:
EN IEC 60079-0:2018, IEC 60079-0:2017,
EN 60079-11: 2012, IEC 60079-11: 2011
CAUTION
Special conditions for use:
1.For IIC Ga uses the pressure switches have to be installed and used in such a way, that electrostatic
charging from operation, maintenance and cleaning is excluded.
For IIIC Da uses process-related electrostatic charges, e.g. due to passing media have to be excluded
for pressure switches containing non-metallic parts.
2.Metallic parts have to be included in the local potential equalization.
3.The intrinsically safe supply is connected to the ground potential for safety reasons. Potential
equalization has to exist in the entire area of the installation of the intrinsically safe circuit.
4.For the uses in areas that require EPL Ga the devices have to be installed in such a way, that ignition
hazard due to impact or friction can be excluded.
CAUTION
No inadmissible heating can be expected that affect the maximum surface temperature. The maximum
surface temperature lies only a small amount above the permissible ambient temperature during
operation.
Approval data for Ex i switches DPD1T, DPD2T
Approval:
II 1 G
II 1 D
Ex ia IIC Ga
Ex ia IIIC T200100°C Da
Certificate no.:
TÜV 22 ATEX 322922 X, IECEx TUN 22.0011X
Permissible ambient
temperature:
-40 °C < Ta < +75 °C
Electrical data for
intrinsically safe
application:
Ui = 28 V
Ii = 50 mA
Pi = 0,84 W
Li, Ci =negligibly small
Standards applied:
EN 60079-0: 2018/AC:2020-02, IEC 60079-
0:2017, EN 60079-11:2012, IEC 60079-11:2011
Approval data for Ex i switches DPDT/DPD1T with ST1, DPDT/DPD2T with ST1 and ST3
Approval:
II 1 G
II 1 D
Ex ia IIB Ga
Ex ia IIIC T200100°C Da
Certificate no.:
TÜV 20 ATEX 322922 X, IECEx 22.0011X
Permissible ambient
temperature:
-40 °C < Ta < +75 °C
Electrical data for
intrinsically safe
application:
Ui = 28 V
Ii = 50 mA
Pi = 0,84 W
Li, Ci =negligibly small
Standards applied:
EN 60079-0: 2018/AC:2020-02, IEC 60079-
0:2017, EN 60079-11:2012, IEC 60079-11:2011
13
12
CAUTION
Special conditions for use:
1.The size of the nameplate exceeds the permissible area and can therefore be electrostatically
charged:
For IIC Ga uses the pressure switches have to be installed and used in such a way, that
electrostatic charging from operation, maintenance and cleaning is excluded.
For the use in explosive dust atmospheres process-related electrostatic charges, e.g. due to
passing media have to be excluded.
2.All metallic parts of the devices have to be included in the local potential equalization.
3.The intrinsically safe circuit of the device is connected to the earth potential, therefore potential
equalization has to exist in the entire area of the installation of the intrinsically safe circuit.
4.The housings of the devices consist of more than 10% aluminum, therefore in EPL Ga applications
the installation has to be carried out in such a way, that ignition hazard due to impact or friction
can be excluded.
No inadmissible heating can be expected that affect the maximum surface temperature. The maximum
surface temperature lies only a small amount above the permissible ambient temperature during
operation.
CAUTION