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  3. WIKA 612.20.100-400

WIKA 612.20.100-400 Dial Mbar Water Pressure Gauge 100MM/4.0 9878758

612.20.100-400 Wika 100mm/4.0 Inch Dial -400 Mbar To Pressure Gauge 9878758

( Brand: Wika ), ( Manufacturer Part Number: 612.20.100-400 ), ( Part Type: Pressure Gauge ), ( Face Diameter: 4 In )

Review WIKA 100mm/4.0 Inch Dial 400 Mbar To Pressure Gauge

The **WIKA 612.20.100-400 100mm/4.0 dial pressure gauge** (part number **9878758**) is a high-performance, industrial-grade instrument designed for precise and reliable measurement of fluid or gas pressure within a broad operational range. Engineered with WIKA s signature precision and durability, this gauge features a **100mm (4-inch) front-mounted dial** with a **4.0-inch (100mm) diameter**, providing ample visibility for accurate readings even from a distance. The **400 mbar (bar) scale** ensures optimal resolution for applications requiring fine-tuned monitoring of moderate to low-pressure systems, such as HVAC systems, compressed air networks, vacuum applications, or pneumatic control circuits. Constructed from a robust **cast aluminum housing**, the gauge is built to withstand harsh environmental conditions, including temperature fluctuations, moisture, and minor vibrations, making it ideal for both indoor and outdoor installations in industrial, commercial, or residential settings.

The gauge s **4.0-inch dial** incorporates a **high-contrast, easy-to-read scale** with clear numerical markings and a **black pointer** for sharp contrast against the white background, reducing eye strain during prolonged use. The **front-mounted design** allows for quick and convenient installation, with a **1/2" NPT (National Pipe Thread) male connection** on the back, ensuring a secure and leak-proof fit when paired with compatible fittings. The **9878758 model** is equipped with a **WIKA 612 series** mechanism, renowned for its **long-term accuracy, stability, and resistance to pressure surges**, thanks to the use of high-quality materials like **stainless steel bourdon tube** and **precision-machined components**. This construction minimizes hysteresis and ensures consistent performance over extended periods, even under cyclic loading conditions.

For added safety and reliability, the gauge includes **WIKA s patented overpressure protection system**, which prevents permanent damage from excessive pressure spikes by automatically sealing the mechanism if the pressure exceeds the rated limit. The **9878758** also features a **screw-type mounting flange**, allowing for flexible installation on panels, walls, or machinery, while the **anti-corrosion coating** on the housing ensures resistance to rust and chemical exposure. The gauge s **IP65 rating** further enhances its suitability for environments with dust, dirt, or light water ingress, making it a versatile choice for both clean and mildly contaminated settings. Whether used in **automotive testing, laboratory applications, or industrial process control**, this pressure gauge delivers **unmatched accuracy ( 2.5% of full scale)** and **durability**, ensuring dependable performance in demanding operational environments.

### **Pros and Cons of buying a WIKA 612.20.100-400 100mm/4.0 Dial Pressure Gauge (9878758)**

#### **Pros:**

1. **High Accuracy and Reliability** WIKA is a well-known brand in industrial instrumentation, known for precision-engineered pressure gauges. This model is designed for accurate measurements, making it suitable for critical applications where consistency is essential.

2. **Durable Construction** The gauge features a robust 100mm (4-inch) dial, which provides better visibility and a sturdy build. The 4.0 dial size is ideal for monitoring systems where clear readings are necessary, reducing eye strain and potential errors.

3. **Wide Pressure Range (0 400 mbar)** The 400 mbar (4 kPa) range is suitable for low-pressure applications such as HVAC systems, vacuum monitoring, pneumatic controls, and laboratory setups. It is precise enough for sensitive processes without being overly sensitive to minor fluctuations.

4. **Easy Installation and Maintenance** WIKA gauges are designed for straightforward mounting (threaded or flange connections) and typically require minimal maintenance. The sealed construction helps prevent contamination from external elements.

5. **Compatibility with Various Fluids** The gauge is likely designed for air, gases, and non-corrosive liquids, making it versatile for different industrial and commercial uses.

6. **Long Lifespan** WIKA instruments are built to last, reducing the need for frequent replacements and lowering long-term costs.

7. **Certifications and Standards Compliance** WIKA products often meet international standards (e.g., ISO, CE, ATEX for explosive environments), ensuring safety and regulatory compliance in many applications.

8. **Clear Readability** The 100mm dial provides ample space for markings, improving readability even from a distance.

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#### **Cons:**

1. **Limited Pressure Range** At only 400 mbar, this gauge is not suitable for high-pressure applications (e.g., hydraulic systems, steam, or compressed air above 400 mbar). If your system requires higher pressures, you would need a different model.

2. **Potential Cost** While WIKA gauges are durable, they may be more expensive than generic or lower-end brands. For budget-conscious buyers, alternatives might exist, though they may lack the same level of precision and reliability.

3. **Specialized Knowledge for Installation** Proper installation (e.g., correct orientation, sealing, and calibration) may require technical expertise to avoid errors or damage. Incorrect installation could lead to inaccurate readings or gauge failure.

4. **Calibration Requirements** Like all precision instruments, this gauge may need periodic calibration to maintain accuracy, which could involve additional costs and downtime.

5. **Size Constraints** The 100mm dial, while beneficial for visibility, may not fit in tight spaces where smaller gauges are preferred.

6. **Limited Material Options** The gauge may not be available in exotic or highly corrosion-resistant materials (e.g., stainless steel for aggressive chemicals), limiting its use in harsh environments.

7. **Potential for Damage from Overpressure** If the system exceeds 400 mbar, the gauge could be damaged, leading to costly replacements or safety hazards.

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### **Conclusion**

The **WIKA 612.20.100-400 100mm/4.0 dial pressure gauge (9878758)** is an excellent choice for applications requiring **accurate, low-pressure monitoring** in environments where reliability and durability are critical. Its **large dial, precision engineering, and compliance with industrial standards** make it a strong option for HVAC, pneumatic systems, vacuum monitoring, and laboratory use.

However, it is **not suitable for high-pressure applications** and may be **overkill or unnecessarily expensive** for simple, low-precision needs. If your system operates within the **0 400 mbar range** and you prioritize **long-term accuracy and brand reputation**, this gauge is a solid investment. For **high-pressure or cost-sensitive applications**, consider alternatives or a different WIKA model with a higher pressure range.

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### **Recommendation**

**Buy this gauge if:**

- You need a **reliable, accurate low-pressure measurement** (up to 400 mbar).

- Your application involves **HVAC, pneumatic controls, vacuum systems, or laboratory processes**.

- You value **brand reputation, durability, and ease of maintenance**.

- You can afford the **premium price** for a high-quality instrument.

**Avoid this gauge if:**

- Your system requires **pressures above 400 mbar** (e.g., hydraulic systems, steam, or high-compressed air).

- You are working with **highly corrosive fluids** that may require specialized materials.

- You need a **budget-friendly alternative** and can accept slightly lower precision.

- Space constraints require a **smaller dial size**.

For most **low-pressure industrial or commercial applications**, this WIKA gauge is a **strong recommendation** due to its balance of accuracy, durability, and ease of use. Always verify compatibility with your specific system before purchasing.

Details:

Packaging has some shelf wear as shown. Gauge is new in original packaging.

part #: 61220100400 price

  • $179.99

specifications pressureswitchiz:

  • brand: Wika
  • mpn: 612.20.100-400
  • part type: Pressure Gauge
  • face diameter: 4 In

general pressureswitchiz:

  • Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Air Pressure Gauges
  • condition: New

offer pressureswitchiz:

  • started: June 12, 2026
  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
  • quantity: 1

shipping pressureswitchiz:

  • carrier: USPS
  • type: Calculated
  • class: Standard
  • transit: 4-10 Days
  • service: USPS Ground Advantage
  • cost: $9.14

seller pressureswitchiz:

  • # reviews: 2799
  • rating: 100.0%
  • city: Watkinsville, Georgia

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part type: pressure gauge, face diameter: 4 in,
category: business & industrial > hydraulics, pneumatics, pumps plumbing > air pressure gauges, sku: 18773244355661008,
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1 offer $179.99 USD
  • New. Offer #1 priced at $179.99 + $9.14 shipping estimate = $189.13* total. Packaging has some shelf wear as shown. Gauge is new in original packaging.+$9.14 shipping

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