01

MCG 1090

Level Alarm Probe

Get a Quote ↵

MCG 1090

Tank farm operators, refinery engineers, chemical plant supervisors, terminal automation teams, and EPC specifiers rely on accurate, fail-safe high-level alarms to prevent spills and maintain regulatory compliance.

The MCG 1090 Level Alarm Probe delivers proven overfill protection using a true self-test mechanism that physically moves the displacer during testing. This verifies both the mechanical movement and electrical alarm signaling, ensuring the system will perform correctly during real high-level events rather than only simulated test conditions.

Designed for hazardous-area service, the MCG 1090 offers:

  • Remote test capability
  • Multiplexed communication supporting up to 128 probes
  • Rugged stainless steel construction for long service life

The probe can operate as a standalone alarm device or integrate with the MCG 7030 Touch Panel Alarm Monitor. Together they help facilities reduce wiring costs, simplify testing routines, and maintain dependable alarm readiness across large tank installations.

MCG 1090
MCG 1090 Level Alarm Probe
MCG 1090

Features

True Self-Test Movement

Physically lifts the displacer to validate full mechanical and electrical operation, preventing silent failures and ensuring alarms work under real process conditions.

Explosion-Proof Safety

UL and ATEX flameproof housings meet stringent hazardous-area standards, enabling compliant operation in high-risk hydrocarbon and chemical environments.

Remote Test Capability

Optional remote self-testing allows validation from the control room or MCG 7030 monitor, reducing field labor and improving testing frequency.

Multiplexed Wiring Option

Supports up to 128 probes per tankway, lowering wiring cost and simplifying installation compared to individually wired alarm probes.

Proven Mechanical Reliability

Simplified stainless-steel construction and durable displacer design minimize wear, ensuring stable long-term performance across harsh or idle conditions.

Flexible Alarm Configurations

Supports Hi, Hi-Hi, or Low alarm setups and multiple I/O options, adapting easily to diverse process requirements and safety architectures.

Applications

  • Overfill Protection: Triggers independent high or high-high alarms to prevent spills, satisfy state fire codes, and support API-2350 compliant safety layers in storage tanks.
  • Pump & Valve Control: Provides reliable switching for pump shutdown or valve actuation, reducing response time and preventing equipment damage during abnormal conditions.
  • Hazardous Fluid Storage: Suitable for petroleum, chemical, and solvent tanks requiring certified explosion-proof instrumentation to maintain safe, compliant operations.
  • Remote-Test Facilities: Ideal for tanks in difficult-access or hazardous areas where remote self-testing ensures readiness even when probes remain idle for long periods.
  • Emergency Shutdown Systems: Integrates into shutdown logic to provide independent alarm verification, supporting facility risk-reduction and high-integrity protection layers.
  • Idle or Seasonal Tanks: Ensures reliable operation in tanks that see infrequent use, where mechanical verification prevents unnoticed failures during long dormant periods.
02

Specifications

Mounting Connection

1.5” or 2” NPT; 2”, 4”, 6” flange options

Alarms

Hi, Hi-Hi, Lo

I/O

NC/NO, NC/NC, or L&J Tankway

Self-Testing

Automatic (via Tankway), Manual (24VDC), or None

Construction

304 stainless steel housing (standard), nylon displacer (other materials available)

Approvals

UL Explosion Proof, Class I Div. 1 Groups C & D; ATEX II 1/2 G EEx d IIB T6

Dimensions

15″ length, compact footprint

Compatibility

MCG 7030 Touch Panel Alarm Monitor for multiplexed systems (up to 128 probes)

Ordering Options

Available in multiple body sizes, cable lengths (10 ft to 30 ft), stainless steel options, and displacer configurations for specific gravity ranges from 0.50 to 1.0

Contact Support
2026 COST ESTIMATE

Contact Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

Contact Us ↵

Does the self-test verify the entire alarm path?

−

Yes. The MCG 1090 physically moves the displacer during every test, confirming mechanical motion and electrical switching end-to-end—not just electronics simulation.

Can the MCG 1090 be tested remotely?

+

Absolutely. When paired with the MCG 7030 Touch Panel Alarm Monitor or Tankway wiring, tests can be triggered remotely from tank-side or the control room.

How many alarm probes can be multiplexed on one communication loop?

+

Up to 128 probes can be connected on a single Tankway loop, reducing total wiring cost and simplifying installation.

Is the probe certified for hazardous locations?

+

Yes. It carries UL Explosion-Proof and ATEX flameproof approvals for use in Class I, Div. 1 environments and Zone 1/2 areas.

What alarm types are supported?

+

Hi, Hi-Hi, and Lo alarms are available with NO/NC contact outputs or digital Tankway signaling.

What materials are available for the displacer?

+

Standard nylon displacers are offered, with additional materials available depending on specific gravity and chemical compatibility requirements.

Summary

The MCG 1090 Level Alarm Probe is Cognesense’s primary overfill protection solution for storage tanks in petroleum, chemical, and industrial applications. Its true self-test mechanism physically validates alarm function, while multiplexed communication supports up to 128 probes on a single highway. Designed for hazardous-area service with explosion-proof construction and FM/CSA approvals, the MCG 1090 delivers the reliable, independently verified alarm performance that API 2350 and site safety programs demand.

L&J
Measure.
Monitor.
Protect.