The L4079 A, B and W PressureTrol, Limit controls are high pressure limit switches that break electrical circuits when pressure rises to a preset value.
The L4079 A and B can be used with steam, air, noncombustible gases, and fluids noncorrosive to the sensing element.
The L4079 W is for use on oil burner systems
FEATURES
- L4079 A has two ganged spst switches; breaks two circuits (may be both sides of the power supply) simultaneously.
- L4079 B has one spst switch.
- L4079 W is the same as L4079B but has seals for oil applications.
- MICRO SWITCH® snap-acting switches are visible through transparent cover.
- Switches open automatically but must be reset manually.
- Trip-free reset mechanisms do not permit the limiting role of the PressureTrol Control to be defeated by jamming the reset lever.
- Control does not need leveling.
- The L4079 is unaffected by moderate vibration.
TECHNICAL DATA
Electrical ratings
120 V AC: 9.8 A for full load; 58.8 A for locked rotor.
240 V AC: 4.9 A for full load; 29.4 A for locked rotor.
Pressure ratings
| Model number |
Range |
| |
psi |
kPa |
L4079A1) ,
L4079B2) |
2-15 |
15-100 |
|
L4079A1) ,
L4079B2) |
5-50 |
35-350 |
L4079A1) ,
L4079B2) |
10-150 |
70-1035 |
| L4079B10662) |
20-300 |
140-2070 |
| L4079W10002) |
10-50 |
70-1035 |
| Model number |
Max. diaphragm pressure |
Differentials |
|
| |
psi |
kPa |
psi |
kPa |
L4079A1) ,
L4079B2) |
25 |
170 |
3 |
20.7 |
L4079A1) ,
L4079B2) |
85 |
590 |
10 |
68.9 |
|
L4079A1) ,
L4079B2) |
225 |
1550 |
30 |
206.8 |
| L4079B10662) |
350 |
2410 |
60 |
413.7 |
| L4079W10002) |
225 |
1550 |
30 |
206.8 |
1) Ratings apply to each of two separate circuits.
2) One circuit only
Switching action
L4079A: Snap-switch. Breaks two circuits automatically on pressure rise. Each circuit must be manually reset.
L4079B, W: Snap-switch. Breaks one circuit automatically on pressure rise. Circuit must be manually reset.
Adjustment means
External adjustment screw. Scale is calibrated in psi and kPa
Maximum Ambient Temperature
150 °F (66 °C).
Mounting means
Pipe fitting: 1/4-18 NPT, connection on diaphragm assembly. These devices may be either boiler mounted directly to a boiler fitting, or may be surface mounted, such as on a wall, by using the knockouts in the case.
ACCESSORIES
50024585-001 Brass steam trap
14026 Steel steam trap
https://bnsens.en.made-in-china.com/product/NfTUhjyAXbVp/China-Honeywell-Midas-Gas-Detector-MIDAS-K-O3X.html
BNSENS (Nanjing) Sensor Technology Co., Ltd. is located in Nanjing, China. It is a high-tech enterprise specializing in the development, manufacturing and trade of sensor products. The company has brought together a group of outstanding technical experts in various fields such as automation, electronics, machinery and computers. All employees of the company have college degrees or above. It adopts the world-class management and operation model and 6 sigma quality system. At present, the company's main products are pressure, liquid level, flow, current, switches, etc. The company's users are all over the country, and some products have been exported to Japan, South Korea and Southeast Asia.
Since its inception, the company has been based on the technical accumulation and management standards of American sensor giants. It is composed of senior engineers and managers who have served in multinational companies for many years, and has rapidly developed various pressure sensors, transmitters, liquid level, flow meters, pressure switches, digital meters, current sensors, proximity switches and other products. After years of unremitting efforts, it has become one of the leading suppliers in the domestic automation industry. Our pressure transmitters can achieve an accuracy of more than 3/10, 000. The products have been widely used in oil, natural gas, electricity, chemical industry, metallurgy, building materials, food, light industry, environmental protection, aerospace, tap water, municipal and other industries.
It is a sensor science and technology innovation company that masters the core technology of MEMS chips. The company has a research and development center in Minnesota, USA. The leader is Dr. Pan Hanjin, a famous scientist in the sensor industry. Dr. Pan Hanjin has been deeply involved in the sensor industry for more than 20 years and is an expert in the sensor industry.
The company has a number of ASIC chips independently developed, which are widely used in industrial, automotive, home appliance and other markets.
BNSENS (Nanjing) Sensing Technology Co., Ltd. is a strategic partner of Honeywell in China. The two parties proposed a plan of East serving East and jointly developed several sensors specifically for the Chinese market. These sensors will be widely used in intelligent manufacturing, Internet of Things, artificial intelligence, and smart home fields. These sensors include: Magnetic sensors, temperature sensors, humidity sensors, force sensors, fire water pressure sensors, equipment vibration sensors, human body status monitoring sensors, motion sensors, etc.
History of BNSENS Company:
BNSENS is a company focusing on sensors, instruments, and electronic components. We are a young company, founded in 1999, just 25 years old, and we are still growing.
1999: The company's first pressure sensor was launched, mainly for the petroleum and petrochemical industries.
2002: The company expanded its product line and launched temperature sensors
2005: Started producing high-precision pressure sensors for the test and measurement market
2006: Became an official authorized agent of Honeywell
2009: Introduced the Six Sigma management system, and the product qualification rate was greatly improved
2010: Became a supplier of Emerson
2011: We started selling SICK sensors
2014: Introduced the sensor production line from Germany, developed more industrial control sensors, and cooperated with TSMC
2015: Cooperated with Siemens in Vietnam
2017: The factory moved to Nanjing High-tech Zone
2019: Became a national high-tech enterprise in China
2023: We started selling products from Infineon and Rohm
BNSENS, The Future Starts Here.
Audited Supplier 
){kind=link}