Eaton MTL7764+ 2-Channel Zener Safety Barrier with Strain-Gauge Bridge Optimization and 12 V Working Voltage
Price:
negotiable
MOQ:
1
Delivery Time:
In stock
Brand:
MTL
Product Description
MTL7764+ Eaton MTL Zener Safety Barrier
Product Overview
The MTL7764+ is a high-performance 2-channel shunt-diode safety barrier (Zener barrier) from Eaton's Crouse-Hinds series MTL7700 range, specifically engineered for strain-gauge bridge circuits, load cells, and Wheatstone bridge applications requiring intrinsic safety protection in hazardous areas.
This passive device limits the voltage and current that can reach a hazardous area under fault conditions, preventing ignition of flammable atmospheres. With a working voltage of 12 V, end-to-end resistance of 1,000 Ω, and positive polarity configuration, the MTL7764+ is the ideal solution for protecting sensitive strain-gauge based measurement equipment in Zone 0, 1, and 2 hazardous locations (gas groups IIC, IIB, IIA).
Key Features & Benefits
- 2-Channel Efficiency: Two independent intrinsically safe channels in a single compact housing
- Strain-Gauge Bridge Optimization: Specifically designed for strain-gauge bridge circuits and load cell applications
- 12 V Working Voltage: Provides safe voltage limiting for strain-gauge bridge circuits
- 1,000 Ω End-to-End Resistance: Matches impedance requirements of typical strain-gauge bridge circuits
- Positive Polarity Configuration: Designed for positive ground applications
- Ultra-Slim DIN Rail Mounting: Compact 12.6 mm width for standard 35 mm DIN rail installation
- Removable Terminals: Unique removable terminal blocks for easy cabling and maintenance
- Bussed Power Capability: Reduces cabling requirements with integrated bussed power distribution
- High Accuracy Signal Transfer: Passive shunt-diode design ensures minimal signal distortion
- Wide Operating Temperature: Functions reliably from -20°C to +60°C
Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Eaton (Crouse-Hinds series MTL) |
| Series | MTL7700 Range |
| Product Model | MTL7764+ |
| Alternative Part Number | 5710-032-006 |
| Product Type | Shunt-Diode Safety Barrier (Zener Barrier) |
| Number of Channels | 2 (dual-channel) |
| Polarity | Positive (+) |
Electrical Ratings
| Parameter | Value |
|---|---|
| Working Voltage (Vwkg) | 12 V |
| Safety Description | 12 V, 1,000 Ω, 12 mA |
| End-to-End Resistance | 1,000 Ω (±10%) |
| Maximum Current | 12 mA |
| Fuse Rating | 50 mA |
| Max. End-to-End Resistance | 1,050 Ω |
Hazardous Area Specifications (Ex ia)
| Parameter | Value |
|---|---|
| Maximum Voltage (Vmax) | 10.9 V |
| Gas Groups | IIC, IIB, IIA |
| Zones | Zone 0, 1, 2 |
| Equipment Protection Level (EPL) | Ga, Gb, Gc |
| Permitted Capacitance (Co) | 9 μF |
| Permitted Inductance (Lo) | 226 mH |
| Intrinsically Safe Circuit Power | 0.072 W |
| Intrinsically Safe Circuit Current | 24 mA |
| Non-Intrinsically Safe Voltage | AC250V (50/60Hz), DC250V |
Mechanical Specifications
| Parameter | Value |
|---|---|
| Width | 12.6 mm / 13 mm |
| Height | 90 mm / 88 mm |
| Depth | 105 mm / 107 mm |
| Weight | 100 g / 0.119 kg |
| Enclosure Material | Polycarbonate |
| Mounting | DIN rail (35 mm) |
| Terminals | Removable screw terminals |
Environmental Specifications
| Parameter | Value |
|---|---|
| Minimum Operating Temperature | -20°C |
| Maximum Operating Temperature | +60°C |
| Storage Temperature | -40°C to +80°C |
| Humidity | 95% max (non-condensing) |
| Degree of Protection | IP20 |
Function Description
The MTL7764+ is a passive shunt-diode safety barrier that operates on the Zener barrier principle. It limits both voltage and current that can be delivered to a hazardous area circuit under fault conditions.
How it works:
- Voltage limiting: Zener diodes clamp the output voltage to a safe level (12 V)
- Current limiting: A series resistor (1,000 Ω) limits fault current to a safe value (12 mA)
- Fusing: Internal 50 mA fuses provide backup protection under severe fault conditions
- Grounding: The barrier requires a connection to a high-integrity earth ground
Safe Area (Control Side) → MTL7764+ → Hazardous Area (Field Side)
Indicator/Excitation → (Voltage/Current limiting) → Strain-Gauge Bridge/Load Cell
12 V DC supply → (Zener diodes + 1kΩ resistor + 50mA fuse)
[High-integrity earth ground required]
Applications
The MTL7764+ is specifically designed for strain-gauge and load cell applications in hazardous area installations:
| Industry | Application |
|---|---|
| Oil & Gas | Tank level measurement using load cells on storage tanks |
| Chemical Processing | Vessel weighing systems, hopper scales, and silo level monitoring |
| Pharmaceutical | Batch weighing systems for solvent handling equipment |
| Mining | Conveyor belt weighing systems, bin level monitoring |
| Food & Beverage | Tank weighing for flammable liquid storage |
| Marine & Offshore | Cargo tank monitoring, mooring line tension measurement |
Typical Field Devices Connected:
- Strain-gauge bridge sensors (full Wheatstone bridge configuration)
- Load cells (350 Ω to 800 Ω resistance)
- Torque sensors
- Pressure sensors based on strain-gauge technology
- Weighing systems in hazardous areas
Certifications & Approvals
| Certification | Status | Details |
|---|---|---|
| CCC Ex (China) | ✅ Certified | Certificate 2020322316002294 - Valid to 2030-09-01 |
| ATEX | ✅ Certified | BAS01 ATEX 7217 - II (1) GD [Ex ia] IIC |
| IECEx | ✅ Certified | International certification for explosive atmospheres |
| NEPSI | ✅ Certified | China certification body approval |
| RoHS | ✅ Compliant | Lead-free |
Installation Information
| Parameter | Detail |
|---|---|
| Mounting | Standard 35 mm DIN rail (EN 60715) |
| Terminals | Removable screw terminals |
| Grounding | Requires high-integrity earth ground connection |
| Clearance | Minimal - 12.6 mm width enables high-density installation |
| Operating Position | Any orientation |
Important Installation Notes:
- A high-integrity earth ground connection is mandatory for proper Zener barrier operation
- Do not install in areas where condensation may occur
- The barrier must be installed in a safe area (non-hazardous location)
- Maximum cable parameters for IIC gas group apply to field wiring: Co = 9 μF, Lo = 226 mH
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Company
Shenzhen Hengyo Power Technology Co., Limited
Location
Room 2407, B Block No.145 Chengshi Zhuchang Bld, Bagua 2nd Rd, Futian Dist. Shenzhen City, China 518029
Contact Person
Vivian Chan