• daadinstruments@gmail.com
  • +91 9810780146
  • +91 9958700156
  • daadinstruments@gmail.com
  • +91 9810780146

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WEATHERPROOF FRONT HEAD DIFFERENTIAL PRESSURE SWITCH HP/ LP PORT TYPE MODEL
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WEATHERPROOF FRONT HEAD DIFFERENTIAL PRESSURE SWITCH HP/ LP PORT TYPE MODEL

Parameter Specification
Features Fixed / Field Adjustable (External) / Differential Adjustment – External / Internal
Accuracy ± 1% / CL 1
Repeatability ±0.5% / CL 0.5, On Raising / On Falling
Mounting Bottom / Back Panel / 2″ Pipe Mounting Bracket
Enclosure Die Cast Aluminium – Weather Proof Design – IP68
Wetted Parts Body, Diaphragm
MOC SS316 / Monel / Inconel
Process Connection 1/4″ BSP (F) – 2 Nos – Standard, 3/8″, 1/2″ BSP / NPT
Options Mounting Bracket with bolt – Steel Plated / 2″ Pipe mounting bracket
Max. Process Temp. 150°C
Ambient Temp. -20 .. 65°C
Switch Type & Rating 1SPDT, 2SPDT, DPDT, 5A / 250 VAC / 0.2A 24VDC
Micro Switch Standard: Micro Switch with silver contact, Low/High Dead Band, Hermetically / Environment Sealed / Gold Contact
Ranges 10 mbar … 25 bar
Differential Fixed / Adjustable
Accessories Mounting Bracket with bolt – Steel Plated / 2″ Pipe mounting bracket
Cable Entry PG13.5 (standard)
Options 3/4″ ET / 1/2″ NPT / DIN Connector / 4-pin / 7-pin connectors, Single / Double Compression Gland – Weather proof – Brass / SS

Description

The Model WHDP-400 Weatherproof Front Head Differential Pressure Switch is engineered for precise monitoring of differential pressure in demanding outdoor and industrial environments. Featuring a rugged, weatherproof enclosure rated to IP65/IP67, this switch is designed with high-pressure (HP) and low-pressure (LP) front-mounted ports for easy installation and maintenance. Ideal for HVAC, filtration, and process control applications, it ensures accurate detection of pressure differences for system safety and efficiency.

Constructed from durable, corrosion-resistant materials, the WHDP-400 offers adjustable set points and a broad differential pressure range. It includes versatile electrical contact options (SPDT or DPDT) and standard threaded connections (NPT/BSP) for seamless integration. The model meets stringent industry standards for weather resistance and electrical safety, providing reliable, long-lasting performance in harsh operational conditions.

WEATHERPROOF FRONT HEAD DIFFERENTIAL PRESSURE SWITCH HP/ LP PORT TYPE MODEL

WEATHERPROOF FRONT HEAD DIFFERENTIAL PRESSURE SWITCH HP/ LP PORT TYPE MODEL

What People Say About Our Product


Customers consistently praise our temperature and pressure gauges for their accuracy, durability, and ease of installation. From HVAC professionals to industrial users, many highlight the clear readings and reliable performance under tough conditions. Whether for home systems or heavy-duty applications, our gauges are trusted for getting the job done right.

A temperature and pressure (T&P) gauge is used to monitor both the temperature and pressure levels within systems like boilers, water heaters, HVAC units, and other pressurized equipment. It helps ensure the system is operating safely and efficiently.

Installation typically involves threading the gauge into a designated port on the system (usually a 1/4" or 1/2" NPT fitting). Always ensure the system is depressurized before installation and use thread sealant to prevent leaks. Refer to the product manual for specific instructions.

For best performance, it’s recommended to check calibration annually, especially in industrial or high-usage environments. Replace the gauge if you notice inaccurate readings, a stuck needle, or visible damage to the dial or housing.

Our Product Review

This pressure gauge is spot-on accurate and durable. I installed it on a boiler system for a commercial client, and it’s been holding up perfectly under high pressure and heat. The stainless steel casing is rugged, and the glycerin fill really helps reduce needle vibration. Definitely a professional-grade product worth the price

Industrial Pressure Gauge

Very reliable temperature readings and the digital display is easy to read even in low light. I use it for monitoring HVAC systems and it has made diagnostics much quicker. The only downside is that the battery compartment is a bit tricky to open, but overall, it’s a solid product.

Digital Temperature Gauge

I’ve been using this temperature and pressure gauge for a few months on my residential boiler system, and it’s performed consistently well. The readings are accurate, and the dual-scale display is easy to interpret. It was easy to install and fit perfectly into the existing port. Build quality feels solid with a brass connection and clear lens. So far, it's been reliable under both high-temp and high-pressure conditions. I’ll be purchasing more for future installs.

Temperature & Pressure Gauge

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