Lefoo Lf52 Differential Pressure Switch Instruction Manual

LF52 Differential Pressure Switch

Product Information:

The LF52 Differential Pressure switch is a product that allows
you to set a pressure range and be notified when the pressure goes
above or below that range. It comes in single and double set point
options and has an adjustable differential pressure range. The
product is compliant with UL508 and GB14048-2000 standards, as well
as having a ROHS certificate. The switch is available in different
models with varying differential pressure adjustable ranges.

Reference Standards:

1. UL508
2. GB14048-2000 (Low voltage switchgear and control equipment
   general provision)
3. GB14048.5-2000 (Low voltage switchgear and control equipment,
   part 5-1 Control equipment and switching elements)
4. ROHS certificate

Specification:

• Media: Non-hazardous media such as water, air, oil etc…
• Contact arrangement: Converted capillary
• Electrical rating
• Storage temperature
• Ambient temperature
• Media temperature
• High and low pressure connections
• Maximum static pressure
• Maximum differential
• Setting repeatability tolerance
• Degree of protection
• Accessories are optional (if there is no requirement, the
  default is selected)

Order Ref NO:

The LF52Series Order Ref NO is LE52-A-B-C-D, where:

• A denotes the product set point – single set point or double
  set point
• B denotes the joint thread – 7/16Single set point male thread
  or G1/4Single set point female thread
• C denotes the instructions – Chinese or English
• D denotes the lap increment – 1, 2.2, 5.5, 6.5, 16, 25, 38,
  2.2/6.5, 5.5/6.5, 6.5/6.5, 6.5/16, 16/16, 25/25, 38/38

Wiring Diagram:

The wiring diagram for the LF52 Differential Pressure switch is
as follows:

Product Usage Instructions:

1. Select the appropriate model of the LF52 Differential Pressure
   switch based on your requirements.
2. Refer to the order ref no and select the appropriate product
   set point, joint thread, instructions, and lap increment.
3. Install the switch as per the installation dimensions mentioned
   in the user manual.
4. Refer to the wiring diagram and connect the switch to your
   system.
5. Adjust the differential pressure range based on your
   requirement using the adjustable range mentioned in the user
   manual.
6. The switch will notify you when the pressure goes above or
   below the set pressure range.

LF52
Differential Pressure switch

Installation dimensionmm

Single set point

double set point

Product introduction
This adjustable differential pressure switch LF52 is eveloped for sparingly using in different differential value requirements. It is widely applied for detecting the differential of water filter, pump, heat exchanger, chillers and its coil units. When the water flowing (differential) decrease or increase to the setting point, there will be an alarm or cut off output signal for the self-controlling system. It’s also available for indicating the status of pump or water filter. Double differential settings pressure switch can take the replacement of the vane flow switch and avoid changing the vane flow switch from chillers each year. A single set point is a high/low limit that controls the differential pressure between the front and rear ends of a section of pipeline. The double set point is to control the high and low limit of the pressure difference between the front and rear ends of a pipeline, and can also control the high/low limit of the pressure difference between the front and rear ends of the two pipelines.
Reference standard
1.Ul508 2.GB14048-2000 ( Low voltage switchgear and control equipment general provision ) 3.GB14048.5-2000(Low voltageswitchgear and control equipment, part 5-1 Control equipment and switching elements ) 4.ROHS certificate.

Wiring diagram

P1 OR
1C 2NO 3NC

P2

P1

4C 5NO 6NC 1C 2NO 3NC

Adjustable
Single Set Point Working Pressure range
Dual Set Point Working Pressure range

Model
52-15 52-30 52-70 52-100 52-200 52-300 52-400 52-30/100 52-70/100 52-100/100 52-100/200 52-200/200 52-300/300 52-400/400

Differential pressure adjustable range kPa
5–15 5–30 6–70 6–100 10–200 20–300 30–400 5–30/6–100 6–70/6–100 6–100/6–100 6–100/10–200 10–200/10–200 20–300/20–300 30–400/30–400

Differential
1–3 1–3 3–5 3–5 5–7 6–9 6–12 1–3/3–5 3–5/3–5 3–5/3–5 3–5/5–7 5–7/5–7 6–9/6–9 6–12/6–12

LF52Series Order Ref NO LE52-A-B-C-D

AProduct set point Single set point
Double set point

BJoint thread 7/16″Single set pointmale thread
G1/4″Single set pointfemale thread

CInstructions Chinese/English
Chinese English

Lap increment
1 2.2 5.5 6.5 16 25 38 2.2/6.5 5.5/6.5 6.5/6.5 6.5/16 16/16 25/25 38/38
DWiring protection Rubber Plastic Metal

Specification
Media Contact arrangement Electrical rating Storage temperature Ambient temperature Media temperature
High and low pressure connections
Maximum static pressure Maximum differential Setting repeatability tolerance Degree of protection Accessories are optional (if there is no requirement, the default is selected)

Non hazardous media such as water, air, oil etc…
One/two sets of SPDT (microswitch) 3A 250VAC 5A 125VAC -29~82 -20~71 -20~93 7/16″Single set pointmale thread7/16″UNF double set pointmale thread G1/4″Single set pointfemale threadG1/4″double set pointfemale thread 16bar 10bar ±1% Ip54
Converted capillar y, plastic/metal/rubber/line card, manual in Chinese/English