LF52 Differential Pressure Switch
Instruction Manual
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:
- Ul508
- GB14048-2000 ( Low voltage switchgear and control equipment general provision )
- GB14048.5-2000(Low voltageswitchgear and control equipment, part 5-1 Control equipment and switching elements )
- ROHS certificate.
Installation dimension（mm）
Wiring diagram
| Adjustable | Model | Differential pressure adjustable range kPa | Differential | Lap increment |
| Single Set Point Working Pressure range | 52-15 | 5—15 | 1—3 | 1 |
| 52-30 | 5—30 | 1—3 | 2.2 | |
| 52-70 | 6—70 | 3—5 | 5.5 | |
| 52-100 | 6—100 | 3—5 | 6.5 | |
| 52-200 | 10—200 | 5—7 | 16 | |
| 52-300 | 20—300 | 6—9 | 25 | |
| 52-400 | 30—400 | 6—12 | 38 | |
| Dual Set Point Working Pressure range | 52-30/100 | 5—30/6—100 | 1—3/3—5 | 2.2/6.5 |
| 52-70/100 | 6—70/6—100 | 3—5/3—5 | 5.5/6.5 | |
| 52-100/100 | 6—100/6—100 | 3—5/3—5 | 6.5/6.5 | |
| 52-100/200 | 6—100/10—200 | 3—5/5—7 | 6.5/16 | |
| 52-200/200 | 10—200/10—200 | 5—7/5—7 | 16/16 | |
| 52-300/300 | 20—300/20—300 | 6—9/6—9 | 25/25 | |
| 52-400/400 | 30—400/30—400 | 6—12/6—12 | 38/38 |
LF52Series Order Ref NO
LE52-A-B-C-D
| A Product set point | B Joint thread | C Instructions | D Wiring protection |
| Single set point | 7/16”Single set point（male thread） | Chinese/English | Rubber |
| Double set point | G1/4”Single set point（female thread） | Chinese | Plastic |
| English | Metal |
Specification
| Contact arrangement | Non hazardous media such as water, air, oil etc… |
| Media | One/two sets of SPDT (microswitch) |
| Electrical rating | 3A 250VAC 5A 12 VAC |
| Storage temperature | -29~82℃ |
| Ambient temperature | -20~71℃ |
| Media temperature | -20~93℃ |
| High and low pressure connections | 7/16″Single set point（male thread）；7/16″UNF double set point（male thread） G1/4″Single set point（female thread ）；G1/4″double set point（female thread ） |
| Maximum static pressure | 16bar |
| Maximum differential | 10bar |
| Setting repeatability tolerance | Ip54 |
| Degree of protection | ±1% |
| Accessories are optional (if there is no requirement, the default is selected) | Converted capillary, plastic/metal/rubber/line card, manual in Chinese/English |
Documents / Resources
 |
LEFOO LF52 Differential Pressure Switch [pdf] Instruction Manual 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, LF52 Differential Pressure Switch, LF52, Switch, Pressure Switch, LF52 Pressure Switch, Differential Pressure Switch |