Differential Pressure Gauge for Filter & Flow Monitoring

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Product Overview

Our Differential Pressure Gauges measure the pressure difference between two points in a process system, providing a direct and cost-effective indication of filter loading, flow rate, pump head, or fluid level — without the complexity of electronic instrumentation. Using a dual-chambered piston or diaphragm sensing element, the instrument deflects proportionally to the differential pressure, driving a clearly readable pointer across a color-coded scale. These gauges are essential in HVAC, industrial filtration, and cleanroom applications for detecting when filters require replacement, and in flow measurement applications when used in conjunction with an orifice plate or Venturi restriction.

Technical Specification Sheet

Parameter	Detail
Differential Pressure Range	0–100 mbar up to 0–10 bar
Static Line Pressure	Up to 250 bar (independent of DP range)
Accuracy Class	±2.5% or ±1.6% of full scale
Nominal Size	DN 100 mm (4"), 150 mm (6")
Sensing Element	Piston type or Diaphragm type
Wetted Parts Material	Stainless Steel 316L or Hastelloy (optional)
Process Connection	G1/4, NPT1/4 (High and Low ports)
Optional Contacts	SPDT microswitch for alarm output

Key Features

Directly displays pressure differential without requiring external power or signal converters.
High static pressure-rated body allows accurate DP measurement on high-line-pressure systems (up to 250 bar).
Optional microswitch contact for direct alarm or filter change signal output.

Typical Use Cases

Industrial Filter Monitoring: Indicating progressive clogging of strainers, cartridge filters, and bag filters in process pipelines.
HVAC Air Filtration: Monitoring air filter loading in air handling units (AHUs) and clean room systems.
Flow Indication: Combined with orifice plates for local flow rate indication without electronic instruments.
Pump Performance: Monitoring differential pressure across pumps to detect cavitation or impeller wear.
Heat Exchanger Monitoring: Detecting fouling by increased pressure drop across tube bundles.

Competitive Benefits

No Power Required: Fully mechanical operation eliminates electrical installation costs and provides reliable indication during power outages.
High Static Pressure Tolerance: Capable of accurately measuring small DP values even when both process ports are at high static pressure — a critical capability many gauges lack.
Direct Filter Status: Red/green/yellow color-coded scale provides an instant visual filter condition assessment readable from a distance.
Low Maintenance Design: No electronic components to fail; periodic zero-check is the only maintenance required.
Alarm Integration Option: SPDT microswitch contact directly triggers a filter change alarm or automatic bypass valve, enabling automation without a DP transmitter.

Payment and Shipping Details

We accept T/T, L/C, and PayPal for all order sizes. Standard shipping terms are FOB Shanghai/Ningbo or CIF destination port. Standard piston-type DP gauges ship within 7–10 working days; high-static-pressure and exotic-material variants require 15–20 working days. Units with factory-calibrated alarm setpoints are available and are shipped with a setpoint verification certificate.

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Differential Pressure Gauge for Filter & Flow Monitoring Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.