Wholesale Ventilation System Differential Pressure Gauge Factory, Manufacturers

Related Products

Explore our full range of pressure gauge solutions

Pressure Sensor

View Details →

Medical Pressure Gauge

View Details →

Y50 Pressure Gauge

View Details →

Y50 Pressure Gauge

View Details →

Y50 Pressure Gauge

View Details →

Y50 Pressure Gauge

View Details →

Y50 Pressure Gauge

View Details →

Y50 Pressure Gauge

View Details →

Medical Pressure Gauge

View Details →

Medical Pressure Gauge

View Details →

Medical Pressure Gauge

View Details →

Medical Pressure Gauge

View Details →

Product Introduction

Precision instrumentation engineered for ventilation system differential pressure gauge applications

The Ventilation System Differential Pressure Gauge is built around a stretched-diaphragm or capsule-element movement specifically sized to resolve the very small pressure differences — often only a few hundred pascals — that indicate a loaded air filter, a slipping fan belt, or a partially closed damper long before airflow drops enough to be noticed by occupants. Two connection ports on the back of the case allow the gauge to be piped across a filter bank, coil, or fan to display the differential directly rather than requiring the reading to be calculated from two separate absolute-pressure gauges.

Unlike a standard Bourdon-tube pressure gauge, whose mechanical leverage is too coarse to give useful resolution below roughly one bar, the diaphragm or capsule element in this instrument amplifies tiny pressure differences into a readable pointer sweep across the full dial arc, giving building engineers the sensitivity needed to catch gradual filter loading trends over weeks rather than discovering a problem only after airflow has already dropped significantly.

Every diaphragm assembly is leak-tested and calibrated in our 100,000-level clean workshop, where the low-pressure element's zero point is set under controlled, draft-free conditions to guarantee accuracy at the low end of the scale where most filter-monitoring readings occur. Calibration data for each range and port configuration is logged in our Advanced MES digital tracking system against the unit's serial number for full traceability.

A surface, panel, or duct-mount case style is available to suit installation directly on an air handling unit door, a remote control panel, or in-line in ductwork, and an optional integral switch contact allows the same gauge to trigger a building automation alarm the moment differential pressure crosses a pre-set filter-change threshold, turning a passive indicator into an active maintenance-scheduling tool.

Core Advantages

Engineered for reliability where it matters most

0-500Pa

Typical Low-Range Scale

±2%

Accuracy Class

Dual Port

High/Low Differential Connection

High-Resolution Low-Pressure Element — Diaphragm or capsule movement resolves pressure differentials far finer than a standard Bourdon-tube gauge
Dual-Port Differential Connection — Two back-mounted ports pipe directly across a filter, coil, or fan for a true differential reading
Early Filter-Loading Warning — Catches gradual filter loading trends over weeks, before airflow drops enough to affect occupant comfort
Optional Alarm Switch Contact — Integral switch can trigger a building automation alarm at a pre-set differential pressure threshold
Flexible Mounting Styles — Available in surface, panel, and duct-mount case styles to suit AHU doors, panels, or in-line ductwork
MES Traced Production — Serial-linked quality data from raw material to shipment for full after-sale traceability

Specifications

Standard technical parameters

Dial Size	2.5" (63mm), 4.0" (100mm)
Accuracy Class	Class 2 Full Scale (Class 1.6 on request)
Pressure Range	0-100 Pa to 0-5000 Pa (custom low ranges available)
Sensing Element	Stretched Diaphragm or Capsule Element
Connection Ports	Two 1/8" NPT Back-Entry Ports (High / Low)
Case Material	ABS Plastic (standard) or Aluminum Alloy (option)
Mounting Style	Surface, Panel Flush, or Duct Mount
Switch Contact Option	SPDT Micro-Switch, Field-Adjustable Set Point
Media Compatibility	Clean, Dry, Non-Corrosive Air or Compatible Gas
Operating Temperature	-10°C to +60°C ambient

Technical Summary

Order & production details

MOQ	300 Pieces (Standard Low-Range Models)
Lead Time	18-25 Days (custom switch set points may extend timeline)
Packaging	Individual boxes with port protective caps installed
Certifications	ISO9001:2015, CE, RoHS Compliant
Raw Materials	ABS Engineering Plastic, Aluminum Alloy, Silicone Diaphragm
Customization	Pressure range, switch set point, case material, port thread
Port of Export	Ningbo / Shanghai
Payment Terms	T/T, L/C at Sight, Western Union

Our Partners

Trusted by leading brands worldwide

Industrial Applications

Where ventilation system differential pressure gauge performance is mission-critical

Air Handling Unit Filter Banks

Piped across pre-filter and final filter sections to display loading condition and schedule replacement

Fan Coil Unit Monitoring

Confirms fan performance by tracking the pressure rise generated across the fan wheel over time

Cleanroom Pressure Cascades

Monitors the small positive pressure differential maintained between adjacent cleanroom zones

Damper Position Verification

Confirms a motorized damper has reached its commanded position by the resulting pressure change

Laboratory Fume Hood Monitoring

Tracks face velocity indirectly via differential pressure to confirm safe fume hood containment

Technical Highlights & QC

Every unit validated for zero-defect performance

Diaphragm Leak Test: Each diaphragm assembly is pressure-decay tested to confirm zero leakage across the sensing element and case seals.
Low-End Zero Calibration: Zero point is set under draft-free conditions in a controlled chamber to guarantee accuracy at the low end of the scale.
Switch Set-Point Verification: Units with an integral switch contact are cycled through the set point multiple times to confirm reliable actuation.
Port Cross-Talk Test: High and low ports are tested independently to confirm no internal leakage path exists between the two chambers.
Full-Scale Linearity Sweep: Each unit is stepped through the full pressure range to verify linearity within the specified accuracy class.
MES Serial Tracking: Range, switch configuration, and calibration sweep data are stored digitally against each unit's serial number.

Environment & Media Compatibility

Engineered for demanding operating environments

Low-Velocity Airflow Zones: Diaphragm sensitivity is unaffected by the low air velocities typical near filter banks and fan coil units.
Dusty Filter Bank Locations: Sealed diaphragm chamber keeps sensing elements isolated from the dust load present downstream of dirty filters.
Cleanroom Pressure-Controlled Spaces: Non-contaminating case materials suit installation within or adjacent to controlled cleanroom environments.
Vibration from Adjacent Fan Motors: Diaphragm element and damped movement resist reading disturbance from nearby fan and motor vibration.
Variable Building Ambient Temperature: Case materials and diaphragm compound remain stable across typical unconditioned mechanical room temperature swings.
Corrosive Laboratory Exhaust: Optional corrosion-resistant wetted materials are available for fume hood and laboratory exhaust monitoring duty.

Pro Tips for Longevity

Installation & maintenance best practices

Confirm High and Low Port Orientation: Connect the high-pressure port to the upstream (dirty) side and the low-pressure port downstream to read a positive differential.
Use Matched Tubing Lengths: Keep both sensing lines a similar length and diameter to avoid introducing a false differential from unequal line resistance.
Protect Sensing Lines from Moisture: Install condensate traps on sensing lines in humid ductwork to prevent water from blocking the diaphragm ports.
Set Alarm Thresholds Conservatively: Set the switch contact threshold well before the filter manufacturer's maximum rated pressure drop to allow response time.
Zero-Check After Long Idle Periods: Verify the gauge reads zero with both ports open to atmosphere after extended system shutdown before returning to service.
Avoid Mounting Near Strong Vibration Sources: Where possible, mount the gauge on a stable panel rather than directly on a vibrating fan housing for best readability.

Payment & Logistics

Reliable global supply chain from factory to your site

Flexible Payment Terms: We support T/T (30% deposit, balance before shipment), L/C at sight for large orders, and secure B2B trade assurance platforms for new customers.
Global Freight Options: Sea freight from Ningbo or Shanghai for bulk orders; DHL, FedEx, or UPS air express for urgent sample and small-batch shipments.
Port-Protected Packaging: Each gauge ships with protective caps installed on both sensing ports to prevent contamination during transit.
Full Export Documentation: Commercial invoice, packing list, certificate of origin (CO), material certificates, and CE declaration of conformity provided with every shipment.
Sample Lead Time: Standard low-range samples available within 5-7 working days. Custom switch set points require 10-12 working days.
After-Sales Support: Our technical team provides installation guidance and switch wiring documentation to support your building automation integration.

About Us

Zhoushan Jiaerling Meter Co., Ltd. — 20 years of precision manufacturing

Zhoushan Jiaerling Meter Co., Ltd. was established in 2004. It is China Ventilation System Differential Pressure Gauge Manufacturers and Wholesale Ventilation System Differential Pressure Gauge Factory, which is a high-tech enterprise integrating design, research and development, manufacturing, import and export trade.

The company is located in Zhoushan City, Zhejiang Province, covering an area of 15,000 square meters, equipped with a 100,000-level clean workshop, conventional production and assembly workshop, automated production workshop, new laboratory and comprehensive office building.

After more than 20 years of hard work and development, the company has a stable design and development, production team, and advanced production and testing equipment. The company specializes in the production of various types of pressure gauges with complete specifications, and the annual output of pressure gauges reaches 6 million. In order to further develop, the company not only seeks improvement in technology, but also pays more attention to product quality and after-sales service. The company's purpose is to "regard quality as life, survive by reputation, promote development by technology, and serve customers with high-quality brands". The products are sold all over the world and are well received by domestic and foreign customers.

In 2019, the company participated in the compilation of the standard T/CECS10012-2019 "Gas Heating Hot Water Boiler and Water Heater Water Circuit Components" of the China Engineering Construction Standardization Association.

Under the implementation of modern and digital enterprise management, the company has successfully introduced the advanced MES system in 2023, and the order process is fully visualized to track data, ensuring the continuity of production and improving production efficiency.

The company will continue to adhere to the principles of excellence, accuracy, reliability, continuous improvement, and meeting customer needs, hoping to share harmony and prosperity with friends across the country.

Honor

Certifications and proprietary achievements

High-Tech Enterprise

Proprietary

Frequently Asked Questions

Everything you need to know before specifying or ordering

What pressure range should I choose for filter monitoring?

Most standard AHU filter banks fall between 0-250 Pa and 0-500 Pa; consult your filter manufacturer's rated pressure drop to size the range correctly.

Can this gauge trigger a building automation alarm?

Yes, models with an integral SPDT switch contact can be wired to a BAS input to trigger an alarm or maintenance ticket at a set differential.

Does the gauge need to be mounted level?

Diaphragm and capsule elements are generally less orientation-sensitive than liquid-filled instruments, but panel mounting is recommended for best accuracy.

Can I use this gauge for cleanroom pressure cascade monitoring?

Yes, the low-range scale options are well suited to the small positive differentials typically maintained between cleanroom zones.

What happens if only one port is connected?

Leaving one port open to atmosphere effectively converts the gauge into a low-range gauge-pressure instrument rather than a true differential.

How is the switch set point adjusted?

A field-accessible adjustment screw inside the case sets the switch trip point; our documentation provides the calibration procedure.

Can this gauge handle corrosive exhaust air?

Standard wetted materials are suited to clean air; specify the corrosion-resistant option for laboratory or corrosive exhaust monitoring.

What is the typical accuracy at very low pressure ranges?

Class 2 accuracy is standard; Class 1.6 is available for critical cleanroom or laboratory applications requiring tighter tolerance.

Is the gauge suitable for outdoor duct installation?

Standard cases are rated for indoor mechanical room use; consult us for weatherproof enclosure options for outdoor ductwork.

Can the dial be printed with a filter-change color band?

Yes, custom dial printing with green/yellow/red maintenance zones is available for qualifying order quantities.

Related Information

Latest insights and industry knowledge