Barksdale Series 8000 - Manual

Operating Instructions Compact Piston and
Diaphragm Pressure Switches Series 8000
1. Product description
The pressure switches are specifi cally designed 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.
Application according to instructions
Pressure switches must only be used for applications specifi ed in the instructions.
This means that the temperature has to be within the specifi ed ranges, the pressure values and the
electrical rating must not exceed the values specifi ed.
Attention: This device is not designed to be used as the only safety relevant element in pressurized
systems according PED 97/23/EC.
2. Instructions on the use of pressure switches
General instructions
Pressure peaks and pressure shocks exceeding the maximum operating pressure are inadmissible.
The maximum operating pressure is the upper fi nal value of the adjustable range or, if specifi ed, the
pressure indicated as maximum operating pressure. Exceeding the maximum operating pressure
affects the performance and the life span of the product and may damage it. Pressure switches
must be mounted as free of vibration as possible.
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 ap-
plication spark supression and current limiting is recommended.
Application in hazardous locations
The pressure switches Series 8000 with optional EXI are approved for applications in hazardous
locations for intrinsically safe circuits. Units designed for intrinsically safe EXI application must be
operated with a switch amplifi er (see page 2 fi g. 1). They are only for use in an approved intrinsically
safe circuit.
Approval class and identifi cation characteristics according to type label information must be
observed. The models having a lightalloy (Aluminum) enclosure or part of enclosure must be
protected against all impact or friction which can ignite the explosive atmosphere. EC-Design
approved types are marked with a label according to ATEX 95 (page 2).
Operating life time
The switches are designed for an operating life time of at least 1 million cycles when used under
normal design criteria.
3. Installation
Pressure and electrical connections must be provided by professional or trained staff following the
general state-of-the-art standards (See wiring diagram on page 4). Installation / removal must
only occur with all sources of energy (electrical and hydraulic / pneumatic) disconnected.
The standard fl ange version (CETOP) can be mounted directly on the hydraulic blocks. For pipe
connection mounting blocks with two or four bores are available for wall mounting (ø5.6 mm).
(see page 4)
4. Set point adjustment
In pressure switches, a displacement of the pressure sensing element occurs with a change in
pressure. The displacement of the pressure sensing element operates a microswitch.
Any set point adjustment may be performed by the user.
Upon delivery of the product, the set point is approximately in the middle of the adjustable range.
For an extra charge, fi x set points may be adjusted by our factory. In this event, the point will be
indicated on the type plate or separate plate, i = increasing, d = decreasing.
The set point is adjusted by turning the adjustment screw.
- Allow pressure switch to reach the desired switch pressure.
- Turn adjustment screw clockwise to increase pressure setpoint or counterclockwise to
decrease pressure setpoint.
Please note:
Please consult the wiring diagram for the contact status at atmospheric
pressure. (see wiring diagram page 4)
Precise adjustment of set point to actuate on increasing pressure
1. Lower system pressure to 0 bar.
2. Increase pressure slowly and check if micro switch is actuated at desired switch pressure.
3. If necessary, readjust by turning the adjustment screw
4. Repeat step 1 - 3 until microswitch operates at desired switch pressure.
Precise adjustment of set point to actuate on decreasing pressure
1. Increase pressure up to a point clearly above the desired switch pressure
(at least, switch pressure plus max. hysteresis; not above max. operating pressure).
2. Lower pressure slowly and check if micro switch is actuated at desired switch pressure.
3. If necessary, readjust by turning the adjustment screw.
4. Repeat step 1 - 3 until microswitch operates at desired switch pressure.
5. Maintenance
The country specifi c test intervals for monitoring plants should be base on the PED and ATEX
guideline are to be observed. The pressure switch is maintenance free.
Checking the set points lies within the discretion of the user.
6. Transport and storage
Severe shock and vibrations, also during transport, should be avoided. Storage should be dry and
clean.
Barksdale Control Products
3211 Fruitland Avenue
Los Angeles, CA 90058
Tel.: +1(323) 589-6181
Fax: +1(323) 589-3463
e-mail: [email protected]
www.barksdale.com