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Product Introduction

Precision instrumentation engineered for back connection hvac pressure meter applications

The Back Connection HVAC Pressure Meter routes its process connection straight out of the rear of the case rather than the bottom, allowing the entire instrument to sit flush against a control panel with the connecting pipework completely concealed behind the panel sheet metal. This is the preferred configuration for cabinet builders who want a clean, professional dial layout on the visible face without a protruding stub pipe interrupting the line of gauges below the panel edge.

Behind the dial, a bronze or stainless steel Bourdon tube converts line pressure into pointer rotation through a movement mounted for stable operation regardless of the gauge's orientation on the panel, since back-connected gauges are frequently installed at various heights and sometimes even on angled or sloped control desks. The rear connection stub is sized to pass cleanly through a standard panel cut-out along with the mounting bracket, simplifying installation for panel assembly technicians working from the rear of the cabinet.

Assembly takes place in our 100,000-level clean workshop, where the rear stub-to-case weld or thread joint is pressure-tested individually before the movement is fitted, guaranteeing no hidden leak path exists behind the panel where it would be difficult to detect during routine visual inspection. Every unit's connection configuration and calibration record is logged in our Advanced MES digital tracking system.

A front bezel ring and U-clamp bracket secure the case to the panel from behind, so no visible fasteners interrupt the clean dial face from the front. This makes the back-connection configuration particularly popular for retail-facing equipment fronts, architecturally exposed plant rooms, and any installation where panel aesthetics matter as much as functional pressure indication.

Core Advantages

Engineered for reliability where it matters most

2"–4"

Available Dial Sizes

±1.6%

Accuracy Class

100%

Concealed Rear Pipework

Fully Concealed Rear Pipework — Process connection exits the back of the case, keeping all pipework hidden behind the panel face
Clean Panel Aesthetics — No visible fasteners or bottom-entry stub, ideal for architecturally exposed or retail-facing installations
Orientation-Stable Movement — Bourdon tube movement performs reliably regardless of panel mounting angle or height
Simplified Rear Assembly — Rear stub and U-clamp bracket pass cleanly through a standard panel cut-out for fast technician installation
Individually Leak-Tested Joint — Rear stub-to-case connection is pressure-tested before movement fitting to eliminate hidden leak paths
MES Traced Production — Serial-linked quality data from raw material to shipment for full after-sale traceability

Specifications

Standard technical parameters

Dial Size	2.0" (50mm), 2.5" (63mm), 4.0" (100mm)
Accuracy Class	Class 1.6 Full Scale (Class 1.0 on request)
Pressure Range	0-1 Bar to 0-60 Bar (custom ranges available)
Bourdon Tube	Phosphor Bronze (standard) or 316L Stainless Steel
Process Connection	1/4" NPT / BSPT Center Back Entry
Case Material	Chrome-Plated Brass or 304 Stainless Steel
Mounting Style	Panel Flush with Rear U-Clamp Bracket
Panel Cut-Out	Matched to case diameter, standard DIN sizing
Window Material	Polycarbonate (standard) or Mineral Glass (option)
Case Fill	Dry (standard) or Glycerin-Filled (anti-vibration option)

Technical Summary

Order & production details

MOQ	300 Pieces (Standard Range Back-Connection Models)
Lead Time	18-25 Days (custom rear stub lengths may extend timeline)
Packaging	Individual boxes with rear stub protected by a fitted end cap
Certifications	ISO9001:2015, CE, RoHS Compliant
Raw Materials	H59 Brass, 304 SS, Phosphor Bronze, U-Clamp Steel Bracket
Customization	Rear stub length, pressure range, case material, panel cut-out size
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 back connection hvac pressure meter performance is mission-critical

Control Cabinet Instrument Grids

Rows of back-connected gauges give a clean, uninterrupted dial line across a control cabinet front

Retail-Facing Equipment Fronts

Concealed pipework suits equipment where customers or the public may view the panel from the front

Architecturally Exposed Plant Rooms

Suits modern plant rooms designed with visible glazed walls where instrument tidiness is part of the design brief

Sloped or Angled Control Desks

Orientation-stable movement performs reliably on angled operator consoles and sit-stand control desks

Compact Skid-Mounted Equipment Panels

Rear connection saves front panel depth on compact skids where bottom-entry stubs would foul adjacent components

Technical Highlights & QC

Every unit validated for zero-defect performance

Rear Stub Weld Pressure Test: The rear connection stub-to-case joint is individually pressure-tested before the movement is fitted to guarantee no hidden leak path.
Multi-Orientation Calibration Check: Movement accuracy is verified with the case in multiple mounting orientations to confirm stable performance regardless of panel angle.
Panel Cut-Out Fit Verification: Sample units are fitted to a standard DIN panel cut-out template to confirm consistent, tool-free installation.
U-Clamp Bracket Torque Test: Rear mounting bracket fasteners are torque-tested to confirm secure panel retention without over-stressing the case.
Full-Scale Linearity Sweep: Each unit is stepped through the full pressure range to verify linearity within the specified accuracy class.
MES Serial Tracking: Connection configuration, stub length, and calibration data are stored digitally against each unit's serial number.

Environment & Media Compatibility

Engineered for demanding operating environments

Concealed Panel Cavity Conditions: Rear stub and fittings are rated for the confined, sometimes poorly ventilated space behind a sealed control panel.
Angled Console Mounting: Orientation-stable Bourdon tube movement maintains accuracy on sloped operator desks and angled equipment fronts.
Vibration from Panel-Mounted Equipment: Optional glycerin fill damps pointer flutter transmitted through the panel from adjacent motors or switchgear.
Humidity Behind Sealed Panels: Sealed case and gasketed window resist condensation that can form in poorly ventilated panel cavities.
Dust Accumulation in Cabinet Interiors: Rear stub design keeps the process connection joint away from front-panel dust that could otherwise obscure a bottom-entry stub.
Repeated Panel Access for Maintenance: Rear U-clamp bracket withstands repeated removal and refitting during panel maintenance without loosening over time.

Pro Tips for Longevity

Installation & maintenance best practices

Confirm Rear Clearance Before Installation: Verify sufficient depth exists behind the panel for the rear stub and connecting pipework before cutting the panel opening.
Support the Rear Pipework Independently: Do not let the connecting pipe hang solely from the gauge stub; support it separately to avoid stressing the rear joint.
Use the Correct Panel Cut-Out Size: Match the panel cut-out precisely to the case diameter specification to ensure the U-clamp bracket seats correctly.
Tighten the U-Clamp Evenly: Tighten the rear bracket screws evenly and progressively to avoid distorting the case or misaligning the dial face.
Label Rear Connections Clearly: Since pipework is hidden from the front, label rear connections clearly during installation to simplify future maintenance.
Specify Glycerin Fill for Panels Near Vibration Sources: Choose the glycerin-filled option when the panel is mounted near motors, compressors, or other vibration-generating equipment.

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.
Rear Stub Protected Packaging: Each gauge ships with a fitted end cap over the rear stub thread to prevent damage or 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 back-connection samples available within 5-7 working days. Custom stub lengths require 10-12 working days.
After-Sales Support: Our technical team provides panel cut-out drawings and rear clearance dimensional documentation for your cabinet builders.

About Us

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

Zhoushan Jiaerling Meter Co., Ltd. was established in 2004. It is China Back Connection HVAC Pressure Meter Manufacturers and Wholesale Back Connection HVAC Pressure Meter 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

How much clearance is needed behind the panel?

Typically 60-100mm depending on dial size and stub length; our dimensional drawing specifies the exact clearance for each model.

Can the rear stub length be customized?

Yes, standard and extended stub lengths are available to suit different panel thicknesses and pipework routing requirements.

Does back connection affect reading accuracy?

No, the connection location does not affect accuracy; the movement is calibrated identically to bottom-entry equivalents.

What panel material and thickness is compatible?

Standard steel and aluminum panels from 1.5mm to 4mm thickness are compatible with the standard U-clamp bracket.

Can I mix back-connection and bottom-entry gauges on the same panel?

Yes, but back-connection units are recommended for a uniformly clean front appearance across an entire instrument row.

Is a glycerin-filled version available for back-connection models?

Yes, glycerin fill is available as an option for installations near vibration sources such as motors or compressors.

How is the gauge removed for calibration or replacement?

Access from behind the panel to loosen the U-clamp bracket; the gauge then withdraws forward through the panel cut-out.

What is the standard panel cut-out tolerance?

Cut-out dimensions follow standard DIN sizing with a small clearance tolerance specified in our installation drawing.

Can this gauge be supplied with a switch contact for alarms?

Yes, back-connection models are available with an integral electrical switch contact for alarm or interlock applications.

What certifications does this gauge carry?

Standard units carry ISO9001:2015, CE, and RoHS compliance; additional certifications are available on request.

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