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Level Measurement Technology for Seal Pot Applications

Measuring and ensuring proper liquid levels in your seal pots protects expensive equipment and your brand. Whatever your application, high-quality liquid level instrumentation is crucial. For end-users that means accurate performance, advanced diagnostics, and no calibration necessary regardless of specific gravity changes. For seal pot manufacturers that means a variety of price and performance options, with worldwide safety approvals and simple, easy to stock configurations.

Many seal pot users and manufacturers are looking to comply with the API Standard 682. The third edition of API 682 came out in September 2004 in order to combine with ISO 21049. Revision 3 specifically mentioned ultrasonic switches. API Standard 682 Revision 4 came out in May 2014. Revision 4 was the first mention of indicating transmitters, specifically hydrostatic, but it does open the standard to other technologies that meet purchaser approval if specified. This includes the substitution of switches in place of transmitters. However, if transmitters are selected, the recommendation is that they should be analog, two-wire type, and have 4-20 mA output. Operations seeking to adhere to API Standard 682, whether Revision 3 or Revision 4, should select liquid level measurement technology that meets these qualifications.

Level Instrumentation for Seal Pot Applications
Magnetrol® produces a series of level instruments to help protect your seal pot applications:

API 682 Revision 3 Compliant

1. Echotel® 961 Ultrasonic Single Point Relay Switch
Why Choose It: Offers the ultimate solution to reliable single point liquid level indication.
Key Benefits:

  • No calibration or density configuration required
  • LED indication with optional window
  • Provides enhanced diagnostic information
  • Stainless steel enclosure available
  • Time delay available to avoid false level alarms
  • Suitable for Safety Integrity Level (SIL) 2 loops

2. ECHOTEL 962 Ultrasonic Dual Point Relay Switch
Why Choose It: Has two independent switches in a single instrument to achieve low level and high level indication.
Key Benefits:

  • No calibration or density configuration required
  • Top mounted to eliminate taps and reduce costs
  • Provides enhanced diagnostic information
  • Stainless steel enclosure available
  • Time delay available to avoid false level alarms
  • Suitable for Safety Integrity Level (SIL) 2 loops

API 682 Revision 4 Compliant

1. ECHOTEL 961 Current Shift Model
Why Choose It: The most economical option for Revision 4.

All the benefits of the 961 Relay Switch Model plus:

  • Two-wire device
  • Provides discrete mA outputs with continuous indication (8 mA is normal operation, 16 mA is level alarm)
  • Meets NAMUR NE43 recommendations (3.6 mA or 22 mA) for malfunction indication to provide 4-20 mA range

2. ECHOTEL 962 Current Shift Model
Why Choose It: Top-mounted option that eliminates taps.

All the benefits of the 962 Relay Switch Model plus:

  • Two-wire device
  • Provides discrete mA outputs (8 mA is low level alarm, 12 mA is normal operating level, 16 mA is high level alarm)
  • Meets NAMUR NE43 recommendations (3.6 mA or 22 mA) for malfunction indication to provide 4-20 mA range

3. Horizon® 704 Guided Wave Radar Transmitter
Why Choose It: Provides all of the advantages of GWR and the most cost effective option.

Key Benefits:

  • Most cost effective GWR
  • Reduce taps and costs
  • Single compartment housing
  • Continuous 4-20mA/HART output
  • NAMUR NE43 Compliant
  • Easy to stock configuration

4. Eclipse® 706 Guided Wave Radar Transmitter
Why Choose It: Leading edge level transmitter designed to provide measurement performance well beyond that of many of the more traditional technologies.

Key Benefits:

  • Complete proactive diagnostics with automated waveform capture
  • Available with DTMs and allows for HART or Foundation Fieldbus installations
  • Accurately measures from the bottom to the top of the probe for small ranges without a dead zone or transition zone
  • Superior signal-to-noise ratio

More Information
For more information about level measurement technology for seal pot applications, and other technologies that can protect your applications, visit echotel.magnetrol.com.