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Square Dial Capillary Thermometer

Remote Sensing Industry

Square Dial Capillary Thermometer

A square case breaks from the traditional round gauge silhouette to align cleanly with rectangular control panel cut-outs and modern instrument fascias, while the capillary-linked sensing bulb reads temperature safely away from hot or vibrating pipework.

ISO9001:2015 CE Certified RoHS Compliant MES Traced Square Case Capillary Remote

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Product Introduction

Precision instrumentation engineered for square dial capillary thermometer applications

The Square Dial Capillary Thermometer combines a distinctive square case geometry with proven capillary remote-sensing technology, giving panel designers a way to line up temperature indicators in a tidy grid alongside square pressure gauges, switches, and indicator lights rather than fighting for space among round bezels. The square footprint also makes more efficient use of panel real estate than a round dial of equivalent readability, which matters on crowded control fascias.

A liquid-filled sensing bulb is installed directly in the process line or tank, connected by a flexible copper or stainless steel capillary to the square display head, which can be positioned up to several meters away on the control panel. As the bulb fluid expands and contracts with temperature, it drives the Bourdon-tube style movement behind the square dial with no electronics, no signal conversion, and no calibration drift from electrical interference — the reading is a direct mechanical translation of process temperature.

Dial faces are printed in our 100,000-level clean workshop to keep the scale free of the dust inclusions that dull lesser instruments over time, and every capillary is vacuum-filled and degassed before final assembly so the pointer sweeps smoothly with no hesitation or micro-jumps. Each finished unit's capillary length, fill type, and calibration sweep are recorded in our Advanced MES digital tracking system against its serial number.

The square bezel is available with a flush, surface, or flange mounting style, and the case can be specified in chrome-plated brass or 304 stainless steel to suit indoor control rooms or outdoor plant installations. Because the sensing bulb and display head are mechanically separated, the square dial itself never has to touch the hot, cold, or vibrating surface it is monitoring, extending its service life well beyond a directly-mounted equivalent.

Core Advantages

Engineered for reliability where it matters most

100mm
Standard Case Size
±1.5%
Accuracy Class
0.5–5m
Capillary Length Range
  • Space-Efficient Square Case — Aligns naturally with square pressure gauges and switches for a clean, gridded panel layout
  • Capillary Remote Sensing — Bulb reads temperature at the process point while the dial stays accessible on the panel face
  • Zero Electronics — Fully mechanical liquid-fill system; immune to EMI, power loss, and control signal noise
  • Vacuum-Filled Capillary — Bubble-free fill guarantees a linear, hesitation-free pointer sweep across the full scale
  • Flexible Case Material — Chrome-plated brass for indoor panels or 304 stainless steel for humid and outdoor sites
  • MES Traced Production — Serial-linked quality data from raw material to shipment for full after-sale traceability

Specifications

Standard technical parameters

Dial Size80mm x 80mm, 100mm x 100mm, 150mm x 150mm
Accuracy ClassClass 1.5 Full Scale (Class 1 on request)
Temperature Range-40°C to +400°C in multiple fixed-range options
Capillary Length0.5 m, 1 m, 1.5 m, 2 m, 3 m, 5 m; custom on request
Capillary MaterialCopper or 304 SS with PVC protective sheath
Sensing Bulb SizeDiameter 10mm, length 100-250mm standard
Bourdon TubePhosphor Bronze (standard) or 316L Stainless Steel
Fill FluidDegassed Silicone Oil or Mercury-Free Alcohol Compound
Case MaterialChrome-Plated Brass or 304 Stainless Steel
Mounting StyleFlush, Surface, or Flange Mount

Technical Summary

Order & production details

MOQ200 Pieces (Standard Capillary Length Models)
Lead Time25-30 Days (custom capillary lengths may extend timeline)
PackagingIndividual foam-lined boxes; capillary coiled and secured to prevent kinking
CertificationsISO9001:2015, CE, RoHS Compliant
Raw MaterialsH59 Brass, 304 SS, Phosphor Bronze, PVC Sheath
CustomizationCapillary length, bulb size, dial range, case material
Port of ExportNingbo / Shanghai
Payment TermsT/T, L/C at Sight, Western Union

Our Partners

Trusted by leading brands worldwide

Industrial Applications

Where square dial capillary thermometer performance is mission-critical

Square-Grid Control Panels

Lines up flush with square pressure gauges and pilot lights for a tidy, professional panel layout

Storage Tank Farms

Bulb inserted through a tank-top thermowell while the dial reads at ground-level operator height

Food & Beverage Process Lines

Remote dial keeps the readable face away from washdown sprays while the bulb sits in the process pipe

Oven & Dryer Control Cabinets

Isolates the dial from radiant heat near the chamber while sensing accurate internal temperature

Marine Engine Control Rooms

Square case matches the instrument grid typical of ship engine control console layouts

Technical Highlights & QC

Every unit validated for zero-defect performance

  • Vacuum Fill Verification: All capillary assemblies are filled under controlled vacuum to eliminate air inclusions before the system is sealed.
  • Capillary Bend Cycle Test: Capillary tubes undergo repeated bend cycling at minimum radius to confirm the tube does not fatigue-crack in service.
  • Linearity Sweep Test: Each unit is stepped through multiple temperature points to verify hysteresis remains within specification across the scale.
  • Square Bezel Seal Test: Gasket and window seal on the square case are pressure-spray tested to confirm no moisture reaches the movement.
  • Bulb Response Time Check: Sensing bulb response is timed in a reference bath to confirm it meets the rated response specification.
  • MES Serial Tracking: Capillary length, fill batch, and calibration sweep data are stored digitally against each unit's serial number.

Environment & Media Compatibility

Engineered for demanding operating environments

  • High Process Temperature: Silicone oil fill reliably transmits temperature signals from hot process media while the display head stays at ambient temperature.
  • Washdown Environments: IP65-rated square case and gasketed window resist water ingress in food and beverage washdown areas.
  • Vibration Isolation: The capillary link decouples the display head from bulb-side vibration, keeping the pointer steady on rotating equipment.
  • Corrosive Media Contact: Stainless steel wetted bulb surfaces resist attack from mild acids, alkalis, and many industrial process fluids.
  • Cold Storage & Refrigeration: Low-temperature fill formulations maintain accurate response down to sub-zero cold-room conditions.
  • Outdoor Tank Farm Exposure: UV-stable case coating and sealed window suit uncovered outdoor tank and pipe rack installations.

Pro Tips for Longevity

Installation & maintenance best practices

  • Respect Minimum Bend Radius: Never bend the capillary tighter than the specified minimum radius; kinking permanently damages the inner tube.
  • Support Long Capillary Runs: Use soft clamps at regular intervals rather than letting the capillary hang under its own weight over long distances.
  • Apply Hydrostatic Correction: When the display head sits well above or below the bulb, a small zero-offset correction may be needed at commissioning.
  • Install a Thermowell for Pressurized Lines: A separable thermowell lets the bulb be withdrawn for service without draining the pressurized process line.
  • Route Away from Sharp Edges: Use grommets or conduit sleeves where the capillary passes through bulkheads to protect it from abrasion.
  • Do Not Field-Splice the Capillary: The system is sealed and vacuum-filled at the factory; field cutting or splicing destroys the fill and voids performance.

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.
  • Capillary-Safe Packaging: Capillary tubes are coiled to a safe radius and placed in custom foam-cut inner boxes to prevent kinking in 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-length samples available within 7-10 working days. Custom capillary length samples require 12-15 working days.
  • After-Sales Support: Our technical team provides installation guidance, dimensional drawings, and calibration documentation for your incoming inspection.

About Us

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

Zhoushan Jiaerling Meter Co., Ltd.

Zhoushan Jiaerling Meter Co., Ltd. was established in 2004. It is China Square Dial Capillary Thermometer Manufacturers and Wholesale Square Dial Capillary Thermometer 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.

20+
01.Corporate History
15,000M²
02.Factory Area
6,000,000
03.Annual Output (Pieces)
50+
04.Export Area

Honor

Certifications and proprietary achievements

Frequently Asked Questions

Everything you need to know before specifying or ordering

Why choose a square dial over a round one?
A square case tiles neatly against other square instruments on a panel, reducing wasted space compared with mixing round and square bezels on the same fascia.
How far can the capillary run from the bulb to the dial?
Standard lengths run from 0.5 m to 5 m; longer custom runs are possible but increase response lag and hydrostatic correction requirements.
Can the bulb be removed for calibration?
Only if a separable thermowell is installed; without one, the bulb and capillary form a single sealed assembly that should not be disturbed.
What fill fluid is used and is it food-safe?
Standard fill is degassed silicone oil; food-grade fill options are available for processing environments where accidental contact is a concern.
Does capillary length affect reading accuracy?
Length itself does not affect accuracy within rated range, but height difference between bulb and dial should be zero-corrected at installation.
Can I get a compound range that reads below zero?
Yes, sub-zero ranges are available for refrigeration and cold-chain applications; specify your minimum expected temperature when ordering.
What case finish options are available?
Chrome-plated brass suits dry indoor panels, while 304 stainless steel is recommended for humid, outdoor, or washdown environments.
Is the square case interchangeable with round-case panel cut-outs?
No, the square case requires a matching square panel cut-out; confirm your panel drawing before ordering.
What is the typical response time of the bulb?
Response is typically under 30 seconds for standard bulb sizes in a well-mixed liquid; slower in still air applications.
Can you supply custom scale printing?
Yes, custom dial scales, units (°C/°F), and OEM branding are available for qualifying order quantities.

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Ready to Order or Need a Custom Capillary Configuration?

Tell our engineering team your process temperature, capillary length, and panel cut-out size. We will configure the right square-dial capillary thermometer for your application. OEM & ODM branding available with fast sample service.

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