EN
Operating instructions
14306499.01 02/2019 EN
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg • Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de
© 02/2019 WIKA Alexander Wiegand SE & Co. KG
All rights reserved.
WIKA
®
is a registered trademark in various countries.
Prior to starting any work, read the operating instructions!
Keep for later use!
Contents
Declarations of conformity can be found online at www.wika.com.
1. General information
2. Design and function
3. Safety
4. Transport, packaging and storage
5. Commissioning, operation
6. Faults
7. Maintenance and cleaning
8. Dismounting, return and disposal
9. Specifications
Pressure switch, high adjustability of switch differential
For the process industry
Model PSM-700
2
14306499.01 02/2019 EN
WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
1. General information
■
The mechanical pressure switch described in the operating instructions has been
designed and manufactured using state-of-the-art technology. All components
are subject to stringent quality and environmental criteria during production. Our
management systems are certified to ISO 9001.
■
These operating instructions contain important information on handling the instrument. Working safely requires that all safety instructions and work instructions are
observed.
■
Observe the relevant local accident prevention regulations and general safety
regulations for the instrument’s range of use.
■
The operating instructions are part of the product and must be kept in the immediate vicinity of the pressure measuring instrument and readily accessible to skilled
personnel at any time.
■
Skilled personnel must have carefully read and understood the operating instructions prior to beginning any work.
■
The manufacturer‘s liability is void in the case of any damage caused by using
the product contrary to its intended use, non-compliance with these operating
instructions, assignment of insufficiently qualified skilled personnel or unauthorised
modifications to the instrument.
■
The general terms and conditions contained in the sales documentation shall apply.
■
Subject to technical modifications.
■
Further information:
- Internet address: www.wika.de / www.wika.com
- Relevant data sheet: PV 35.05
Abbreviations, definitions
DPDT Double pole double throw
SPDT Single pole double throw
NC Normally closed contact type (NC = normally closed)
NO Normally open contact type (NO = normally open)
COM Common contact
GND Ground connection
2. Design and function
2.1 Overview
2.2 Description
The pressure element of the model PSM-700 is a resilient bellow from stainless steel
which works against a spring mechanism with an adjustable pre-load force. On the
spring mechanism there is a contact arm for actuating the switch contact. The switch
is actuated as soon as the force generated by the pressure in the pressure element is
greater than the set pre-load force.
2.3 Terms used
Maximum operating pressure
The maximum static pressure with which the instrument can be used without changing
the assured performance data.
Reset point
The pressure value at which the switch returns to the starting position. Mathematically,
the pressure value for the reset point is equal to the pressure value of the switch point
minus the switch differential on rising pressure. On falling pressure, the pressure value
for the reset point is equal to the pressure value of the switch point plus the switch
differential.
Switch differential
The switch differential is the difference between the switch point and the reset point.
This is also known as the switch hysteresis.
2.4 Scope of delivery
Pressure switch, operating instructions
Cross-check scope of delivery with delivery note.
Switch differential setting (option)
Blow-out device
Electrical connection 1, lateral
Electrical connection 2, top
(only for DPDT or option)
Removable cover
Switch point setting
Locking plate with screw (tamper proofing)
Switch point setting display
Process connection
2
3
14306499.01 02/2019 EN
WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
3.4 Personnel qualification
WARNING!
Risk of injury should qualification be insufficient!
Improper handling can result in considerable injury and damage to equipment.
▶
The activities described in these operating instructions may only be carried
out by skilled personnel who have the qualifications described below.
Skilled electrical personnel
Skilled electrical personnel are understood to be personnel who, based on their
technical training, know-how and experience as well as their knowledge of country-specific regulations, current standards and directives, are capable of carrying out work on
electrical systems and independently recognising and avoiding potential hazards. The
skilled electrical personnel have been specifically trained for the work environment they
are working in and know the relevant standards and regulations. The skilled electrical
personnel must comply with current legal accident prevention regulations.
3.5 Labelling, safety marks
Product label (example)
Switching function and pin
assignment
Permissible switching voltage
Article number
Electrical rating
Serial number
Permissible ambient and medium
temperature ranges
Setting range
Ingress protection
P
max
= Maximum operating pressure
Coded date of manufacture
Before mounting and commissioning the instrument, ensure you read the
operating instructions!
PSM-700
NCNOCOM
WIKA Alexander Wiegand SE & Co. KG
63911 Klingenberg, Germany
3. Safety
3.1 Explanation of symbols
WARNING!
... indicates a potentially dangerous situation that can result in serious injury or
death, if not avoided.
CAUTION!
... indicates a potentially dangerous situation that can result in light injuries or
damage to property or the environment, if not avoided.
DANGER!
... identifies hazards caused by electrical power. Should the safety instructions not
be observed, there is a risk of serious or fatal injury.
WARNING!
... indicates a potentially dangerous situation that can result in burns, caused
by hot surfaces or liquids, if not avoided.
Information
... points out useful tips, recommendations and information for efficient and
trouble-free operation.
3.2 Intended use
Depending on the version, the model PSM-700 mechanical pressure switch is fitted with
an SPDT or DPDT switch contact and is used in industrial control, monitoring and alarm
applications. The switch point can be specified by the customer on site. Depending on
the version, the instrument can switch electrical loads of up to AC 250 V, 15 A.
The PSM-700 pressure switch offers many application possibilities for gaseous and
liquid aggressive media that are not highly viscous or crystallising.
Only use the instrument in applications that lie within its technical performance limits
(e.g. max. ambient temperature, material compatibility, ...).
→ For performance limits see chapter 9 “Specifications”.
This instrument is not permitted to be used in hazardous areas!
The instrument has been designed and built solely for the intended use described here,
and may only be used accordingly.
The manufacturer shall not be liable for claims of any type based on operation contrary
to the intended use.
3.3 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous situations and injuries.
▶
Refrain from unauthorised modifications to the instrument.
▶
Do not use the instrument within hazardous areas.
▶
Do not use the instrument with abrasive or highly viscous media.
Any use beyond or different to the intended use is considered as improper use.
2.2 Description
The pressure element of the model PSM-700 is a resilient bellow from stainless steel
which works against a spring mechanism with an adjustable pre-load force. On the
spring mechanism there is a contact arm for actuating the switch contact. The switch
is actuated as soon as the force generated by the pressure in the pressure element is
greater than the set pre-load force.
2.3 Terms used
Maximum operating pressure
The maximum static pressure with which the instrument can be used without changing
the assured performance data.
Reset point
The pressure value at which the switch returns to the starting position. Mathematically,
the pressure value for the reset point is equal to the pressure value of the switch point
minus the switch differential on rising pressure. On falling pressure, the pressure value
for the reset point is equal to the pressure value of the switch point plus the switch
differential.
Switch differential
The switch differential is the difference between the switch point and the reset point.
This is also known as the switch hysteresis.
2.4 Scope of delivery
Pressure switch, operating instructions
Cross-check scope of delivery with delivery note.
Switch differential setting (option)
Blow-out device
Electrical connection 1, lateral
Electrical connection 2, top
(only for DPDT or option)
Removable cover
Switch point setting
Locking plate with screw (tamper proofing)
Switch point setting display
Process connection
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