Inclined Manometer

The Locus Inclined Manometer is a precision instrument designed to measure very low differential pressures in air or gas systems with higher accuracy than standard U-tube manometers. With its inclined scale, it enhances readability and resolution for low-pressure measurements. Ideal for laboratory use, HVAC systems, air velocity testing, and cleanroom applications.

Model :- LM-INCL Series
Brand :- Locus
Body Material :- Acrylic / Aluminium
Tube Material :- Transparent Acrylic / Glass
Scale Type :- Calibrated Inclined Scale
Mounting Type :- Wall / Panel Mounted

Description

1. Product Specifications

Feature	Details
Measuring Range	0–10 mm WC to 0–300 mm WC
Tube Inclination	5° to 20° for fine resolution
Tube Material	Borosilicate Glass / Acrylic
Body Material	Rigid Acrylic / Aluminium
Fluid Used	Red/Blue Manometer Fluid (Low Viscosity)
Mounting	Wall / Panel Mounting
Scale Graduation	In mmWC or Pascal
End Connections	Brass / SS / Plastic Hose Nipples
Operating Pressure	Up to 2 bar
Accuracy	±1.0% of Full Scale

2. Working

An inclined manometer works by displacing a liquid (typically colored oil or water) within a transparent tube mounted at an angle. A small pressure difference causes the fluid to travel a longer distance along the inclined path, providing higher measurement resolution than vertical manometers.

3. Principle

It operates on the hydrostatic principle, where the pressure applied at one end causes the manometric fluid to move. Because the tube is inclined, the horizontal movement is magnified, making small pressure changes more visible.

P = ρgh
Where:
P = Pressure
ρ = Fluid density
g = Gravity
h = Fluid height in inclined tube

4. Assembly

Fix the base and scale plate onto the mounting surface.
Insert the inclined tube and secure with clamps.
Fill the manometer with the appropriate fluid to the zero level.
Attach input and reference pressure connections.
Calibrate if needed using a known pressure source.

5. Installation Process

Mount the manometer on a level wall or vertical panel.
Ensure the scale is visible and levelled using a spirit level.
Connect the pressure ports using flexible tubing.
Avoid bubbles or contaminants in the fluid.
Keep it away from vibration or high-temperature zones.

6. Technical Specifications

Parameter	Value
Measurement Type	Differential Low Pressure (Gas/Air)
Fluid Column Angle	5° to 20°
Fluid Compatibility	Non-reactive with glass/acrylic
Resolution	Up to 0.1 mm WC
Operating Temp.	0°C to 60°C
Storage Temp.	-10°C to 70°C
Protection	Optional Dust Cover / Acrylic Shield
Custom Sizes	Available on Request

7. Troubleshooting (Transparent Tubular Level Gauge)

(also applicable for inclined manometer issues)

Problem	Possible Cause	Solution
Fluid not visible	Leak or empty tube	Refill fluid, check for leaks
Bubbles in tube	Improper filling or air ingress	Refill carefully, vent system
Inaccurate readings	Tilted installation, dirty fluid	Re-level instrument, replace fluid
Fluid discolored	Contaminated or old fluid	Clean tube, refill with fresh fluid
Tube cracked or fogged	Chemical reaction or UV exposure	Replace tube, avoid direct sunlight

8. HS Code (Harmonized System Code)

Product	HS Code (India)	Description
Inclined Manometer	90262000	Instruments for measuring pressure (Manometers)

9. Frequently Asked Questions (FAQs)

Q1. What is the difference between inclined and U-tube manometer?
Inclined manometers are designed for higher accuracy at low pressures. They show more sensitive readings due to the longer scale created by inclination.

Q2. Can I use inclined manometers with water or oil?
Yes. Ensure compatibility with the body material. Usually, colored low-density oils are preferred.

Q3. How do I refill the manometer fluid?
Remove the top plug or open fill point and slowly pour the fluid until it reaches the calibrated zero level.

Q4. Can it be used for liquid pressure measurement?
No. It’s ideal for gas/air only and not suitable for direct liquid pressure.

Q5. Is customization possible?
Yes. Locus offers custom sizes, materials, and branding (OEM/white label) on bulk orders.

10. Applications

- HVAC duct and cleanroom pressure monitoring
- Airflow calibration systems
- Laboratory test benches
- Filter pressure drop measurement
- Laminar airflow cabinets
- Educational and demonstration models
- R&D and process monitoring in low-pressure gas systems

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