WIKA A48 Bimetal Thermometer for HVAC Systems

$100.00

The WIKA A48 Bimetal Thermometer is designed for temperature measurement in air-conditioning, refrigeration and ventilation systems. Its mechanical measuring principle enables direct temperature indication without requiring an external power supply.

Available with 63, 80, 100 and 160 mm dial sizes, the A48 offers scale ranges from −30 to +50°C up to 0 to 120°C. Its adjustable mounting flange allows installation in air ducts with different insulation thicknesses.

🕑 Lead time: 6-8 weeks
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The WIKA A48 is a bimetal thermometer developed specifically for HVAC applications. It measures temperature through the mechanical deformation of a bimetal element and displays the result on an analog dial, making it suitable for straightforward temperature monitoring in ventilation ducts.

Key Features

  • Mechanical temperature measurement: No external power supply required.
  • Multiple dial sizes: 63, 80, 100 and 160 mm.
  • Temperature ranges: From −30 to +50°C to 0 to 120°C, depending on the version.
  • Accuracy class: Class 2 according to EN 13190.
  • Adjustable mounting flange: Accommodates different pipe insulation thicknesses.
  • HVAC-focused design: Suitable for air-conditioning, refrigeration and ventilation systems. WIKA USA+1

Suitable Applications

  • Ventilation ducts: Monitor air temperature in HVAC ductwork.
  • Air-conditioning systems: Check temperatures during system operation.
  • Refrigeration installations: Monitor air temperature within compatible HVAC equipment.
  • Commercial buildings: Support temperature monitoring in ventilation and climate-control systems.

Technical Highlights & Selection Considerations

When selecting the A48, confirm the temperature range, dial size, stem length and mounting requirements. The adjustable flange is particularly useful when the thermometer must pass through insulated duct walls. Also verify the installation position and ensure the selected range covers the expected operating temperature.

FAQ

Q1: Does the WIKA A48 require electrical power?

No. It is a mechanical bimetal thermometer and displays temperature without an external power supply.

Q2: What temperature ranges are available?

Depending on the version, scale ranges extend from −30 to +50°C to 0 to 120°C.

Q3: What dial sizes can I choose?

The available nominal sizes are 63, 80, 100 and 160 mm.

Q4: Can it be installed in insulated ventilation ducts?

Yes. Its adjustable flange is designed to accommodate different insulation thicknesses.

Q5: What information is needed when ordering a replacement?

Provide the full model or part number, temperature range, dial size, stem length and mounting requirements.

Design & Measurement Performance

Measuring Principle Helical bimetal coil sensor
Nominal Sizes (NS) & Models NS 63 mm (Model A48.10.063) | NS 80 mm (Model A48.10.080)
NS 100 mm (Model A48.10.100) | NS 160 mm (Model A48.10.160)
Accuracy Class Class 2 per EN 13190
Scale Ranges -30 to +50 °C | -20 to +60 °C | -10 to +50 °C
0 to 60 °C | 0 to 80 °C | 0 to 120 °C (others on request)
Connection Location Centre back mount (BM)

Materials & Mechanical Construction

Case Material Lightweight corrosion-resistant aluminium
Stem Material & Dimensions Ø 9 mm copper alloy stem; Insertion lengths: 160, 200, and 300 mm
(Minimum immersion depth: approx. 60 mm)
Process Connection Zinc-plated steel mounting flange, sliding/adjustable on stem (Standard Ø 61 mm, optional Ø 50 mm)
Dial & Pointer White aluminium dial with black lettering; Black aluminium pointer
Window Material Acrylic plastic
Zero Point Adjustment Accessible zero adjustment at the bottom tip of the stem

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