The Miljoco-Weiss LF251-5000-4B is a Weiss stainless steel case pressure gauge with a 2-1/2″ dial, a 0-5,000 psi pressure range and a 1/4″ NPT center back connection.
Where vibration, corrosion and pulsating conditions exist, the Weiss line of stainless steel cased industrial pressure gauges is designed for severe applications, with ranges from vacuum to 15,000 psi across the line.
Series LF251 uses Bronze internals in a 2-1/2″ 304 stainless steel case with glycerine fill.
Specifications on this page are taken from the Weiss Stainless Steel Case Gauges catalog (SSG-9/13). Verified 2026-09-11.
Markets
The manufacturer lists this series for the following applications.
- Agricultural equipment
- Hydraulic systems
- Oil field equipment
- Pumps
- Compressors
- Car wash systems
Warranty
Miljoco-Weiss warrants its products to be free from material defects in material and workmanship for 12 months from the date of shipment, or such other period as provided in the product documentation, per the published Miljoco-Weiss terms and conditions of sale (Section 15, Limited Warranty).
Key Features
2-1/2″ 304 stainless steel case
2-1/2″ type 304 stainless steel case with polished stainless steel crimped ring.
Bronze wetted parts
Phosphor bronze Bourdon tube with brass with threaded restrictor socket.
Accuracy ±1.6% of span
LF251 is published at ±1.6% of span.
Glycerine filled with relief valve
A relief valve on all liquid filled gauges compensates for internal case pressure build-up.
Clear acrylic window
Clear acrylic window over a abs dial.
Technical Specifications
| Model | LF251-5000-4B |
| Type | Glycerine filled stainless steel case pressure gauge |
| Ordering Code | Series LF251, range code 5000, connection code 4B |
| Range | 0-5,000 psi |
| Graduations | Figure interval 1000 psi, minor graduation 100 psi |
| Dial Size | 2-1/2″ |
| Case and Ring | 2-1/2″ type 304 stainless steel case with polished stainless steel crimped ring |
| Dial | ABS, white with black and red markings (psi and kPa) |
| Window | Clear acrylic |
| Bourdon Tube | Phosphor bronze (coiled spiral Bourdon tube is standard for 1,000 psi and above) |
| Socket | Brass with threaded restrictor |
| Movement | Brass |
| Pointer | Black anodized aluminum |
| Accuracy | ±1.6% of span |
| Connection | 1/4″ NPT center back |
| Liquid Fill | Glycerine (standard), suitable for +20°F to +150°F; silicone rated -40°F/150°F on special order |
| Relief Valve | Provided on all liquid filled gauges to compensate for internal case pressure build-up |
| Panel Mounting Versions (separate series) | U-clamp Series LF251U and front flange Series LF251F |
Service note. Glycerine can combine with strong oxidizing agents including chlorine, nitric acid and hydrogen peroxide and result in an explosion. Consult the factory for the proper filling medium in hazardous service.
Documentation
Related Products
Frequently Asked Questions
What range does the LF251-5000-4B read?
0-5,000 psi. Figure interval 1000 psi, minor graduation 100 psi.
What is the process connection?
1/4″ NPT center back.
How accurate is it?
The published accuracy for this series is ±1.6% of span.
What are the wetted materials?
Bourdon Tube: Phosphor bronze (coiled spiral Bourdon tube is standard for 1,000 psi and above); Socket: Brass with threaded restrictor.
Is there a service warning for this gauge?
Yes. Do not use glycerine fill with strong oxidizers such as chlorine, nitric acid or hydrogen peroxide, and consult the factory on fill medium for hazardous service.
Manufacturer Warranty
Miljoco-Weiss warrants this product to be free from material defects in material and workmanship for 12 months from date of shipment, per the published Miljoco-Weiss terms and conditions of sale.
Warranty service requires written notice of the defect within seven days of discovery. Remedy is repair, replacement or credit at the manufacturer's discretion. Normal wear, corrosion, misuse and unauthorized modification are excluded.
- Type:
- Pressure Gauge
- Series:
- LF251
- Dial Size:
- 2-1/2 in
- Pressure Range:
- 0-5000 psi
- Range Type:
- Pressure
- Connection Size:
- 1/4 in
- Connection Location:
- Back
- Case Material:
- Stainless Steel
- Wetted Material:
- Bronze
- Fill:
- Glycerine
- Accuracy:
- Plus or Minus 1.6 Percent
