Wise P945 User manual

P945 l P946
Pressure Switch
Manual

01. INTRODUCTION
02. FEATURES
03. SPECIFICATION AND STANDARDS
04. STRUCTURE AND FUNCTION
05. OPERATING PRINCIPLE
06. TRANSPORTATION, STORAGE AND OPENING
07. CONTACT POINT WORKING TYPE AND CONNECTION
08. INSTALLATION
09. WIRING
10. MAINTENANCE AND OPERATION
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04
04
06
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08
09
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02

■WARNING
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2.
3.
4.
5.
6.
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11.
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14.
Do not exceed the pressure range allowed.
Do not use it to measure the pressure of corrosive fluid.
Damage or rupture of pressure gauge may cause release of fluid which could lead to bodily injury or destroy surrounding area.
Do not apply excessive load, vibration or impact.
Please use within the specified temperature ranges.
Exceeding the temperature range may cause disruption in nearby area due to damage to the temperature indicator.
Please use this within the rated input and output specification range stipulated in the specification, or it may cause equipment trouble.
Please use a compression terminal with insulation sheath at the end of wire.
Please use a cable gland of the same class or upper class.
Please construct wiring in accordance with consumers' electrical installation guide and electrical facilities technical standards.
Make sure to turn off the valve to prevent the measuring fluid leak when dismounting the gauge.
Use a pressure gauge with no oil in an environment with hydrocarbon or oxygen.
Oil contained in the gauge may react with oxygen which may be flammable or explosive.
Please always follow the mounting instructions in the manual in cases of field installatio
Do not make any modifications to the product or to add more functions. Please consult with us for any repair.
Please be sure to close a valve and cut off pressure in advance in opening the case of this product.
Please be sure to cut off power because there is a risk of electric shock if wirig.
Work is carried out while electricity is applied. This product cannot be used in explosion proof area.
Please use P953 that is the product of our company, if necessary.
Please read instructions carefully prior to using the instrument for proper and safe operations.
Mishandling could cause device malfunctions and result in disastrous injuries or accidents.
03
Instructions for proper and safe operation

P945, P946 is a pressure switch product with a built-in micro switch, and is so designed that it can be used for corrosive fluid or high pressure process.
The switch is divided into a sensor part under pressure, a control part that regulates the set value and inflow pressure, and a micro switch that gives
contact output. Micro switch is a high-precision product designed so that it can be operated by minute pressure change, and has various rated current
values. Please correctly use this product after having thorough knowledge of this instruction manual that states how to use it respectively in case of
intending to use this product.
1. Introduction
This product can be used for turning on an abnormality alarm or warning light, or process control according to ON-OFF signal in case of reaching the
set pressure. And it cannot be used in explosion proof area.
2. Features
1) Nominal Diameter
2) Repeatability
3) Materials of Wetted Part
4) Working Temperature
5) Number of Contacts
6) Electrical Properties
: 125(W) X 101(H) X 89(T)
: ± 1.0 %, ± 0.5 % OF ADJUSTABLE RANGE
: STAINLESS STEEL 316L
: -20~60 °C
: 1 X DPDT
3. Specification and standards
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RESISTANCE LOAD (A) INDUCTIVE LOAD (A)
RATED
VOLTAGE
125V AC 10 6
10 4
10 4
0.5 0.05
0.25 0.03
10 6
10 614V DC
30V DC
125V DC
250V DC
250V AC
8V DC
NC NO NC NO

7) Measuring Pressure Range and Dead Band
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SETTING RANGE
DEAD BAND OVER RANGE
ONE DPDT
SETPOINT
barbar
PROOF RANGE
150% OF
ADJUSTABLE
RANGE
WITHIN 8%~20%OF
ADJUSTABLE
RANGE
-1~-0.1
0.1~1
0.2~2
0.3~3
0.4~4
0.6~6
1~10
1.5~15
2~20
3~30
5~50
7~70
10~100
15~150

4. Structure and Function
06
FRONT VIEW SIDE VIEW
NAMENO
CASE1
NAMENO
COVER2
NAMENO
BODY3

1)
2)
3)
Attention in Case of Transportation
Please pay sufficient attention to transportation because damage can be caused in terms of performance, in case of being impacted by a fall.
Attention in Case of Storage
Please store it at the place with little humidity and the place where there is no vibration and dust.
In case of multi-level stacking, the weight should be to a degree where packing box isn't deformed. And always store the product so that it
cannot fall.
Attention in Case of Opening a Package
Please carefully handle the object in case of opening a package.
Please take out the product at the sufficiently wide place in order not to drop the object by mistake in taking out it.
Bellows was used as pressure measurement device like figure. And the bellows displacement according to pressure change was enabled to open
and close the micro switch through rod.
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5. Operation Principle
6. Transport, Storage, and Opening

1) 2 Contact Point Type
7. Contact Point Working Type and Connection
08
NO COM NC
SW 1
SW 2
1
4
2
5
3
6

1)
2)
3)
4)
5)
6)
7)
Store this product free of moisture, vibration, dust or corrosive gas.
Avoid higher temperature than specified in this manual.
Be prepared for lightning or vapor.
Avoid direct sunlight.
Use M5 bolts when fixing the product to the panel or wall through fixing holes. When you use fittings, fix them firmly.
Use a flexible tube for the impulse line to prevent excessive force on the pressure gauge.
For pipe connection, do not grab and turn the product case, rather use a designated spanner.
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8. Installation
1)
2)
3)
4)
5)
6)
7)
Please be careful not to overstrain the body.
Please use vinyl sheathed wire, cabtyre cable, etc. suitable for load.
Please firmly wire a terminal block by using a compression terminal for M3.
Please carry out wiring after checking the contact type in the mark of wiring diagram.
Please use waterproof sealing fitting in case of conduit type.
Please use waterproof cable gland in case of cable gland type.
You should use a ground wire with a thickness of 0.7sq or over.
9. Wiring

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2)
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The commercial pressure shall be below 75% of the max graduation.
Do not impose a pressure beyond the allowable limit.
Avoid sudden pressure surge or drop.
If there is a risk of pulsation or impact pressure, install overpressure protection device like dampener or gauge protector.
Do not grease the operation parts in the pressure gauge.
The regular inspection shall be made once or twice in 6 months to check contact operation.
If the indication instrument makes a big error, remove it from the product for inspection.
It may have been caused by wear, corrosion, external shock, vibration, or shock of a part.
In this case, you must remove, adjust, or exchange the part.
Standard rated current is based on 3. 6) However, it may be different in case of having a MICRO S/W built-in.
Therefore, please use it with a tolerance in consideration of inrush current etc. within the rated current marked on this product.
The contact resistance of micro switch increases little by little, as time passes.
Especially, in case of small load, contact resistance increases in a short period of time because "SiO2" accompanied with contact operation is
accumulated at the contact part in the environment where "Si" is contained. Therefore, please carry out ventilation or in the environment
where "Si" is contained. Therefore, please carry out ventilation or use it in the clean environment. In particular, in case of using it for inputting
sequence for control, a contact fault may occur for this reason. Therefore, please use bufferrelay for AC 110/220V between contact and sequence.
Please open and close the cover surely after cutting off power, in case of carrying out work in order to repair or check the pressure gauge.
10. Maintenance and Operation
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