Explosion Proof Cable Gland Product Overview

The Explosion Proof Cable Gland is a small but important accessory for pressure transmitter wiring and field installation. It is installed at the electrical cable entry of a transmitter housing, junction box, control enclosure, or field instrument.

In most industrial pressure measurement applications, the transmitter is installed outdoors, near pipelines, tanks, vessels, pumps, chemical equipment, or hazardous process areas. The cable gland helps secure the cable, seal the entry point, and protect the instrument housing from environmental ingress.

For pressure transmitters and differential pressure transmitters, the most common electrical connection sizes are M20×1.5 and 1/2 NPT. Depending on the project specification, the cable gland can be supplied in explosion-proof, double sealed, stainless steel, brass, armoured cable, or non-armoured cable configurations.

Product Description

A cable gland is not the measuring element of the transmitter, but it directly affects installation safety and long-term reliability. If the cable entry is not properly sealed, moisture, dust, corrosive gas, or hazardous gas may enter the transmitter housing, which can cause wiring failure, corrosion, insulation problems, or unsafe operation in hazardous areas.

The explosion proof cable gland, also called an Ex cable gland, explosion proof cable connector, or double sealed cable gland, is designed to provide a secure cable entry for field instruments used in industrial environments.

For SIYelectric pressure transmitter products, we normally use explosion-proof electrical interfaces. When the customer requires higher sealing performance or hazardous area compliance, a double sealed explosion proof cable gland is usually recommended.

Typical installation position:

Cable → Explosion Proof Cable Gland → Pressure Transmitter Electrical Housing

For differential pressure transmitters, the cable gland is installed on the electronics housing, while the process side may be connected with manifolds, impulse lines, diaphragm seals, or other pressure accessories.

Common Names

This product may be called by different names in project documents or supplier lists:

Key Features

Suitable for Pressure Transmitters

Designed for use with pressure transmitters, differential pressure transmitters, smart transmitters, temperature transmitters, pressure switches, and explosion-proof instrument housings.

Common Electrical Thread Sizes

For pressure transmitter applications, the most common cable entry thread sizes are:

Double Sealed Design Option

When required, a double sealed cable gland can provide improved sealing performance at the cable entry, helping protect the instrument from moisture, dust, and gas ingress.

Explosion-Proof Installation Support

Suitable for transmitter installations in hazardous or explosive atmospheres, depending on the selected certification, material, thread type, and cable specification.

Cable Retention and Strain Relief

The gland helps clamp and support the cable, reducing mechanical stress on internal wiring terminals.

Stainless Steel or Brass Options

Common materials include stainless steel, nickel-plated brass, or other materials according to project requirements. Stainless steel is usually preferred for corrosive, outdoor, marine, or chemical environments.

Technical Specifications

Applications

Pressure Transmitter Cable Entry

Used on pressure transmitter electrical housings to seal the cable entry and protect wiring terminals from moisture, dust, and environmental contamination.

Differential Pressure Transmitter Installation

Commonly used with smart differential pressure transmitters for flow, level, filter differential pressure, and process pressure monitoring systems.

Explosion-Proof Instrument Housings

Suitable for field instruments installed in hazardous areas where explosion-proof electrical entry accessories are required.

Temperature Transmitters and Pressure Switches

Can also be used with temperature transmitters, pressure switches, junction boxes, and other industrial electrical housings.

Outdoor and Harsh Industrial Sites

Used in chemical plants, petrochemical plants, power plants, oil and gas sites, water treatment plants, and general industrial environments where field instruments are exposed to rain, dust, humidity, or corrosive atmosphere.

Advantages

• Common accessory for pressure transmitters and differential pressure transmitters.
• Helps seal and protect the transmitter cable entry.
• M20×1.5 and 1/2 NPT are commonly available for transmitter housings.
• Double sealed cable gland option improves sealing reliability when required.
• Explosion-proof design option supports hazardous area installations.
• Helps prevent dust, moisture, and gas ingress into the instrument housing.
• Provides cable clamping and strain relief for field wiring.
• Stainless steel option is suitable for outdoor, corrosive, marine, and chemical environments.
• Compatible with smart transmitters, pressure switches, junction boxes, and control enclosures.

Selection Notes

When selecting an explosion proof cable gland for a pressure transmitter, confirm the following details:

1. Electrical connection thread
   Confirm whether the transmitter housing uses M20×1.5, 1/2 NPT, G1/2, or another thread.
2. Cable type
   Confirm whether the cable is armoured or non-armoured.
3. Cable outer diameter
   The gland sealing range must match the actual cable diameter.
4. Sealing requirement
   If the project requires better sealing or hazardous area installation, a double sealed cable gland is usually recommended.
5. Material requirement
   • Nickel-plated brass: common for general industrial applications.
   • Stainless steel: better for corrosive, outdoor, coastal, chemical, or harsh environments.
6. Explosion-proof certification
   If used in hazardous areas, confirm the required certification and explosion-proof standard according to the project specification.
7. Instrument compatibility
   Confirm compatibility with the transmitter electrical housing, cable entry direction, and wiring space.