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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
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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
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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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WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused by transport.
Obvious damage must be reported immediately.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property can occur.
▶
When unloading packed goods upon delivery as well as during internal
transport, proceed carefully and observe the symbols on the packaging.
▶
With internal transport, observe the instructions in chapter 4.2 “Packaging
and storage”.
If the instrument is transported from a cold into a warm environment, the formation of
condensation may result in instrument malfunction. Before putting it back into operation,
wait for the instrument temperature and the room temperature to equalise.
4.2 Packaging and storage
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport (e.g. change
in installation site, sending for repair).
Permissible conditions at the place of storage:
■
Storage temperature: -50 ... +60 °C [-58 ... +140 °F]
■
Humidity: 35 ... 85 % relative humidity (no condensation)
Avoid exposure to the following factors:
■
Direct sunlight or proximity to hot objects
■
Mechanical vibration, mechanical shock (putting it down hard)
■
Soot, vapour, dust and corrosive gases
■
Hazardous environments, flammable atmospheres
Store the instrument in its original packaging in a location that fulfils the conditions listed
above.
5. Commissioning, operation
Before installation, commissioning and operation, ensure that the appropriate instrument has been selected in terms of design and specific measuring conditions.
Tools: 6.5 mm socket wrench, cross-head screwdreiver, 20 mm open-ended spanner,
6 mm Allen key
5.1 Requirements at the measuring point
■
The process pressure must not exceed the specified maximum operating pressure.
■
Permissible ambient and medium temperatures remain within the performance
limits.
■
Protected from weather influences.
■
Any vibrations or shocks which occur must not exceed accelerations of
1 g (9.81 m/s
2
) within a frequency range of 10 ... 150 Hz.
■
The measuring line and the process connection must be designed such that no
mechanical loads can occur on the instrument in the entire permissible ambient and
medium temperature ranges.
■
Sealing faces are clean and undamaged.
■
Maintain clearance for blow-out device of > 20 mm.
■
Sufficient space for a safe electrical installation.
→ For performance limits see chapter 9 “Specifications”
5.2 Mechanical mounting
■
After unpacking the instrument, a visual inspection for damage must be carried out.
■
Mounting is only permitted in the depressurised state. Reliably depressurise the
instrument using the available valves and protective devices.
■
Use seals suitable for the process connection provided.
■
When screwing the instruments in, the force required for sealing must not be applied
through the case, but only through the spanner flats provided for this purpose on the
process connection, and using a suitable tool. The tightening torque is dependent on
the selected process connection.
■
After screwing in, make sure that no damage or cracks have occurred at the process
connection.
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5.3 Electrical mounting
Integration of the pressure switch into the installation
Depending on the load characteristics, additional protective measures, e.g. for motor
protection, may be required.
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶
The instrument may only be installed and mounted by skilled personnel.
Switch off the load circuit before starting work and secure against being switched on
unauthorised.
Cable preparation
The cable gland(s) used must be suitable for achieving an IP66 ingress protection. Size
the connecting cables for the largest current strength in the circuits and ensure sufficient
UV resistance and mechanical stability.
Recommendation: 4-wire cable with conductor cross-section of 0.5 ... 2.5 mm²
(AWG 20 ... 14). Fit wire ends with end splices. Conductor cross-section for end splices
with plastic sleeve ≤ 1.0 mm² and for end splices without plastic sleeve ≤ 1.5 mm².
Grounding
Include the ground connection in the inside of the instrument into the grounding concept
of the installation. Maximum conductor cross-section 4 mm².
Clamping the cable
1. Remove 4 screws and open cover
2. Remove the cover(s) of the electrical
connection(s)
3. Fit suitable cable gland(s) and feed in
the cable
4. Carry out the terminal assignment
according to the switching function,
tightening torque: Approx. 0.4 ... 0.5 Nm
5. Close the cover again and fix it with the
4 supplied screws.
5.4 Switch point setting
For an exact setting of the switch point, a test assembly with pressure generation and
pressure reference is needed. This test assembly can, for example, be realised with a
model CPG1500 precision digital pressure gauge and a model CPP30 hand test pump
(not shown).
1. Connect the model PSM-700 pressure switch, pressure reference and pressure
generation to a common pressure system.
2. Ensure that the switch point setting does not switch any loads on or off by mistake.
For visualisation of the switching function, an equivalent circuit, e.g. with a light bulb,
is recommended.
3. Drive slowly towards the required switch point pressure with the pressure generation
and pressure reference. Depending on the definition of the switch point, this must be
carried out on rising/falling pressure.
- If the instrument switches before the required switch point is reached, the switch
point setting must be turned clockwise (+) with the socket wrench.
- If the instrument switches after the required switch point is reached, the switch
point setting must be turned anticlockwise (-) with the socket wrench.
After each correction, release/build up the pressure and repeat this procedure until
the switch point is set correctly.
For instruments with adjustable switch differential directly in the connection, follow the
instructions in the next chapter.
Figure 1: Instrument mounting at the test assembly (also see 5.2 “Mechanical mounting”)
Figure 2: Screwing out the locking plate
Figure 3: Switch point setting
Figure 1
Figure 3
Figure 2
Hold instrument
Screw in and seal the process
connection
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WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
6. Faults
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the listed measures, the instrument
must be taken out of operation immediately.
▶
Ensure that there is no pressure in the instrument and that the load circuit
is switched off. Protect against being put into operation accidentally.
▶
Contact the manufacturer.
▶
If a return is needed, please follow the instructions given in chapter 8.2
“Return”.
WARNING!
Physical injuries and damage to property and the environment caused
by media
Upon contact with hazardous media, harmful media (e.g. corrosive, toxic,
carcinogenic), and also with refrigeration plants and compressors, there is a
danger of physical injuries and damage to property and the environment.
Should a failure occur, aggressive media with extremely high temperature and
under high pressure or vacuum may be present at the instrument.
▶
For these media, in addition to all standard regulations, the appropriate
existing codes or regulations must also be followed.
For further information see chapter 1 “General information”.
Faults Causes Measures
Contact is not switching
in accordance with the
specification at the set
switch point/reset point
Electrical connection
is interrupted.
Carry out a continuity test on the electrical connection lines.
Wiring error, e.g.
short-circuit
Check the pin assignment and correct it
if necessary
Electrical load
unsuitable.
Maintain the permissible electrical loads.
Contact contaminated.
Replace instrument
Switch differential
greater than the
switch point.
Carry out switch point setting with
matching test assembly, see chapter
5.2.
Vibrations Decouple the instrument mechanically.
Short-circuit Moisture in the
instrument.
Only use in ambient conditions for which
the ingress protection is suitable.
Contact chatter
(repeated, shortduration opening and
closing).
Vibrations Decouple the instrument mechanically.
5.5 Setting of the switch differential (option)
The handling instructions described here cannot be carried out on instrument versions
with fixed switch differential.
Before setting the switch differential, the handling steps in chapter 5.2 “Switch point
setting” must be carried out.
4. Release/build up the pressure slowly and check the reset point.
- If the pressure value of the reset point is too high, the adjustment screw for the
switch differential must be turned clockwise with the Allen key.
- If the pressure value of the reset point is too low, the adjustment screw for the
switch differential must be turned anticlockwise with the Allen key.
After correcting the switch differential, the switch point must be re-checked.
5. If the switch point and the reset point coincide with the required pressure values, the
switch point and switch differential setting is complete.
6. Close the cover again and fix it with the 4 supplied screws,
see chapter 2.1 “Overview”.
5.6 Commissioning
■
Check that the following torques for screw connections are maintained:
- Clamping screws and screw for locking plate: Approx. 0.6 Nm
- Case screws: Approx. 1.25 ... 1.5 Nm
■
Check the sealing at the process connection over the entire operating pressure
range before commissioning.
■
Pressure surges must be avoided at all costs, open the shut-off valves slowly.
■
The instrument must not be subjected to any external loading (e.g. use as a climbing
aid, support for objects).
Figure 4: Removing the protective cap of the switch differential setting
Figure 5: Setting the switch differential with Allen key
Figure 6: Tamper proofing (option)
Figure 4 Figure 6Figure 5
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WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
Faults Causes Measures
Switching status
remains unchanged
despite reaching the
switch point/reset point.
Error with switch point
setting.
Carry out switch point setting with
matching test assembly.
Contacts defective
(e.g. fused contact
zone).
Replace instrument. Before recommissioning the new instrument, provide a
protective circuit for the contact.
Pressure port
blocked.
Replace instrument.
Leakage Carry out a leak test. Seal the process
connection or replace the instrument.
For the exchange of the instrument chapters 8 “Dismounting, return and disposal” and 5
“Commissioning, operation” must be observed.
7. Maintenance and cleaning
7.1 Maintenance
The instruments are maintenance-free.
The switch point setting must be checked after 6 months. Carry out switch point setting
with matching test assembly, see chapter 5.2.
Carry out the check with slow rate of change of pressure in the desired pressure direction 3 times with identical initial pressure values.
Repairs must only be carried out by the manufacturer.
7.2 Cleaning
WARNING!
Risk of burns
With cleaning there is a risk through hot surfaces.
▶
Before cleaning the instrument, allow it to cool sufficiently or use protective
equipment!
CAUTION!
Physical injuries and damage to property and the environment
Improper cleaning may lead to physical injuries and damage to property and
the environment. Residual media in the dismounted instrument can result in a
risk to persons, the environment and equipment.
▶
Carry out the cleaning process as described below.
1. Before cleaning, correctly disconnect the instrument from the pressure supply and
switch the load circuit off.
2. Use the requisite protective equipment.
3. Clean the instrument with a moist cloth.
Electrical connections must not come into contact with moisture!
CAUTION!
Damage to the instrument
Improper cleaning may lead to damage to the instrument!
▶
Do not use any aggressive cleaning agents.
▶
Do not use any hard or pointed objects for cleaning.
4. Wash or clean the dismounted instrument, in order to protect persons and the
environment from exposure to residual media.
8. Dismounting, return and disposal
WARNING!
Physical injuries and damage to property and the environment through
residual media
Residual media in the dismounted instrument can result in a risk to persons,
the environment and equipment.
▶
Observe the information in the material safety data sheet for the corresponding
medium.
▶
Wash or clean the dismounted instrument, in order to protect persons and
the environment from exposure to residual media.
8.1 Dismounting
WARNING!
Risk of burns
During dismounting there is a risk of dangerously hot media escaping.
▶
Let the instrument cool down sufficiently before dismounting it!
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶
The dismounting of the instrument may only be carried out by skilled personnel.
▶
Remove the instrument once the system has been isolated from power sources.
WARNING!
Physical injury
When dismounting, there is a danger from aggressive media and high
pressures.
▶
Observe the information in the material safety data sheet for the corresponding
medium.
▶
Dismount the instrument when there is no pressure.
8.2 Return
Strictly observe the following when shipping the instrument:
All instruments delivered to WIKA must be free from any kind of hazardous substances
(acids, bases, solutions, etc.) and must therefore be cleaned before being returned.
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WIKA operating instructions, pressure switch, high adjustability of switch differential, model PSM-700
WARNING!
Physical injuries and damage to property and the environment through
residual media
Residual media in the dismounted instrument can result in a risk to persons,
the environment and equipment.
▶
With hazardous substances, include the material safety data sheet for the
corresponding medium.
▶
Clean the instrument, see chapter 7.2 “Cleaning”.
When returning the instrument, use the original packaging or a suitable transport
packaging.
8.3 Disposal
Incorrect disposal can put the environment at risk.
Dispose of instrument components and packaging materials in an environmentally
compatible way and in accordance with the country-specific waste disposal regulations.
9. Specifications
Operating conditions
Ambient: -10 ... +60 °C [+14 ... +140 °F]
Medium: -30 ... +60 °C [-22 ... +140 °F]
Storage: -50 ... +60 °C [-58 ... +140 °F]
Reference conditions
Relative humidity per BS 6134
< 50 % r. h. at 40 °C (104 °F)
< 90 % r. h. at 20 °C (68 °F)
Ingress protection per IEC/EN 60529
IP66
Switch point repeatability
≤ 0.5 % of span
Switching function
1 x SPDT (single pole double throw) or 1 x DPDT (double pole double throw)
1 or 2 micro switches, contacts silver-plated
Electrical safety
Safety class I per IEC 61010-1:2010 (case grounded with protective conductor),
overvoltage category II, pollution degree 2
Contact version
Switch
type
Electrical rating AC Electrical rating DC
Resistive
load
Inductive
load
Resistive load Inductive load
125 V 250 V 125 V 250 V 30 V 125 V 250 V 30 V 125 V 250 V
Switch differential: Fixed
SPDT 10 A 10 A 10 A 10 A 2 A 0.4 A 0.2 A 1 A 0.03 A 0.02 A
DPDT - 15 A - 10 A 10 A 0.6 A 0.3 A 10 A 0.6 A 0.3 A
Switch differential: Adjustable
SPDT - 15 A - 10 A 10 A 0.6 A 0.3 A 10 A 0.6 A 0.3 A
DPDT - 15 A - 10 A 10 A 0.6 A 0.3 A 10 A 0.6 A 0.3 A
Setting range
Unit Setting
range
SP
1)
factory
set
P
max
2)
Fixed switch
dierential
3)
SPDT
Fixed switch
dierential 3)
DPDT
Adjustable
switch
dierential
3)
bar -1 ... 1.5 0.25 5 ≤ 0.06 ≤ 0.23 0.23 ... 0.9
0.2 ... 1.6 0.9 2.5 ≤ 0.06 ≤ 0.24 0.24 ... 0.95
0.4 ... 4 2.2 9 ≤ 0.16 ≤ 0.6 0.6 ... 2.4
0.7 ... 7 3.85 18 ≤ 0.28 ≤ 1.1 1.1 ... 4
1 ... 10 5.5 18 ≤ 0.4 ≤ 1.5 1.5 ... 6
1.6 ... 16 8.8 25 ≤ 0.64 ≤ 2.4 2.5 ... 9.5
4 ... 25 14.5 36 ≤ 1 ≤ 3.75 3.8 ... 15
7 ... 35 21 50 ≤ 1.4 ≤ 5.25 5.5 ... 20
psi -15 ... 21 3 72 ≤ 0.9 ≤ 3.3 3.3 ... 13
3 ... 23 13 36 ≤ 0.95 ≤ 3.5 3.5 ... 13.5
5.8 ... 58 32 130 ≤ 2.4 ≤ 8.7 8.7 ... 34
10 ... 100 55 260 ≤ 4.1 ≤ 15.5 15.5 ... 60
15 ... 145 80 260 ≤ 5.1 ≤ 22 22 ... 85
23 ... 230 126.5 360 ≤ 9.5 ≤ 35 35 ... 139
60 ... 360 210 520 ≤ 14.5 ≤ 54.5 55 ... 215
100 ... 500 300 720 ≤ 20.5 ≤ 76.5 76.5 ... 300
1) In the absence of customer specication, the switch point “SP” will be preset on falling pressure to the specied value
2) Pmax = Maximum operating pressure
3) The dierence between the switch point and the reset point is also known as switch hysteresis
For further specifications see WIKA data sheet PV 35.05 and the order documentation.
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