Model 114

Diaphragm Type

Tank Level Gauge

± 2% Full Scale Accuracy Decreasing. With the Diaphragm type tank level gauge the high and low-pressure ports are completely isolated from each other. There is no bypass and therefore they can be used for air, gas and liquids. They also come in a variety of dial scales allowing for very sensitive measurements. The Differential Pressure is sensed by the movement of an elastomer diaphragm against a precision calibrated range spring. The change in position of the diaphragm in response to the change in Differential Pressure moves an internal magnet. This magnet, in turn, causes a rotary magnet external to the gauge body to rotate, track the movement of the diaphragm and the attached pointer indicates ΔP on a dial.

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Product Features/Benefits

  • Competitively Priced Rugged Convoluted Diaphragm Design
  • Glass Reinforced Thermoplastic Dial case (Panel Mountable) (Anodized Aluminum Dial Case Option available contact sales for more information)
  • Weather Resistant & Corrosion Resistant
  • Shatter Resistant Lens
  • Over-Range Protection, High over Low and Low over High
  • Terminal Strip Switch & Transmitter options
  • 5 Year Warranty
  • For complete model details See Bulletin_114.pdf
  • Installation and Operation Manual See Bulletin: IOM_114.pdf

Specifications / Configuration

  • Dial Sizes available: 2-1/2”, 4-1/2” and 6” Diameters
  • Dial Scale Ranges: 0-20” H2O to 0-600” H2O
  • Differential Full Scale Descending Accuracy ±2% (ASME B40.100)
  • Available in a Variety of Dial Scales: LOX, Ar, O2, N2, LBS. CO2, CM H2O, MM H2O, KGS, LNG, etc.
  • Working Pressures up to 1000 PSIG (69 Bar)
  • Operating Temp -40°F to +200°F (-40°C to +93°C)
  • Weather Protection NEMA 4X/IP66
  • Material of Construction of Body - Aluminum, Brass, 316/316L Stainless Steel (Wetted Part)
  • Internal wetted parts-316 Stainless Steel, Ceramic Magnet and Teflon Guide Bushings
  • Multiple instrument process connection size and locations available
  • Elastomers (O-ring and Diaphragm Matertials): Buna-N, Viton, Ethylene Propylene.
  • For complete specifications see: Specificationssheet_114.pdf

Common Applications

  • Pressurized Tank Level Monitoring
  • Stationary Tanks – Horizontal or Vertical
  • Tanker Transport / Over the road trailers For materials such as LOX, CO2, Ammonia, Nitrogen Helium, Nitrogen, Hydrogen and Argon

Switch Electrical Specifications:

Diaphragm-Type Tank Level Gauges are available with one or two hermetically sealed reed switches. The switches are mechanically adjustable allowing the customer to set the switch within a defined adjustment span of range of the instrument. Mid-West can also pre-set switch set point(s) upon customer request. All Switches are CE marked per EU Low Voltage and RoHS Directive. The transmitter configuration is enclosed in an Aluminum enclosure with an  ½” FNPT conduit interface.

Mid-West Instrument 114 indicating / non-indicating differential pressure transmitter is a 2 wire loop powered microprocessor based 4-20 mA transmitter. The magnetic angle sensor & electronics senses the angle (relative to the transmitter sensor) of the magnet which moves linearly in the bore. Each transmitter is individually calibrated to the gauge using an 11 point calibration linearization technique. Transmitter options can be  CE marked to the EMC directive upon request.

  • No Power required to operate switches
  • 1-2 Independent adjustable Switches
  • 4-20 ma Transmitter (8-28 VDC Loop Power) 2% Accuracy (20%-100% of scale, Descending)
  • Available Switch Output Options
    • SPDT 3W, 0.25 Amp, 125 VAC/VDC
    • SPST 25W, 0.5 Amp, 230 VAC/VDC (Normally Open)
  • Electrical Enclosures Weather-Resistant, NEMA 4X /IP 66
  • Field Wireable terminal Strip
  • Switch units are  CE Marked in Accordance With Low Voltage & RoHS Directives

Additional Options:

  • ¾” FNPT Stub Mount
  • Pipe Mounting Kit - 2" U-Bolt
  • Wall Mounting Kit
  • Multiple 3-Valve Manifold options
  • Oxygen Cleaning
  • Maximum Follower Pointer

The Mid-West Advantage

Tank Level , Diaphragm Type

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 114 0-0.72 PSID (0-20" H20) to 0-20 PSID (0-600" H2O)
Tank Level Applications
±2% 1000 PSI CE / LVD, RoHS Compliant, NEMA 4X, 4-20mA Transmitter

Tank Level , Bellows Type

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 115 0-10" H2O to 0-69.9" H2O
Tank Level Applications
±1% 500 PSI (Optional 1,000 PSI) None available N/A
Model 116 0-70" H2O to 0-800" H2O
Tank Level Applications
±1% 500 PSI (Optional 1,000 PSI) MICRO SWITCHES
0-80" H2O to 0-800" H2O NEMA 4X, CSA LISTED IND. CONT. EQUIP.