Model 116

Bellows Type

Tank Level Gauge

Mid-West® Instrument Model 116 Tank Level ΔP Gauge – ± 1% Full Scale Accuracy. System pressure is applied to the internal volume of a bellows and mechanical linkage assembly. As pressure changes, the bellows and linkage assembly is mechanically coupled to the gauge indicator pointer. If equipped with a micro-switch, a cam mechanically linked to the bellows, rotates and triggers the micro-switch. The major components of the Model 116 are a two-piece body, bellows sensing element and over-pressure assembly, a torque tube assembly, a range spring and the gauge front assembly.

This assembly incorporates a bi-directional over-pressure relief valve (OPV) which provides protection in both directions. When the Differential Pressure exceeds 130% of the range the OPV equalizes the pressure between the Hi and Lo sides.  ¼” FNPT Dual top and bottom connections are provided as standard.  Model 116 Tank Level gauge is also equipped with a Micro adjust pointer. If necessary, the pointer can be re-zeroed. Body is made of brass with 316 Stainless Steel internals. Viton Seals are provided as standard. The Dial is 6” diameter with white lettering on a black dial. (White dial with black lettering optional) The 116 temperature limits are rated at -40°C to 200°F. Proof pressure is Two Times working pressure at ambient temperature.

Contact Us Today For Availability

Product Features/Benefits

  • Rugged Bellows Sensing Element
  • Glass Reinforced Thermoplastic Dial case (Panel Mountable)
  • Weather Resistant & Corrosion Resistant Gauge Front
  • 270° Dial Arc
  • Shatter Resistant Lens
  • Over-Range Protection, High over Low and Low over High
  • 1 Year Warranty
  • For complete model details See Bulletin_115_116.pdf
  • Installation and Operation Manual See Bulletin: IOM_116.pdf

Specifications / Configuration

  • Dial Sizes available: 6” Diameters
  • Dial Scale Ranges: 0-70” H2O to 0-800” H2O
  • Differential Full Scale Ascending Accuracy available: ±1% (ASME B40.1 Grade 1A)
  • Available in a Variety of Dial Scales: LOX, Ar, O2, N2, LBS. CO2, CM H2O, MM H2O, KGS, LNG, etc.
  • Working Pressures 500 PSIG (34 Bar) 1000 PSI optional (69 Bar)
  • Operating Temp -40°F to +200°F (-40°C to +93°C)
  • Weather Protection & Corrosion Resistant
  • Material of Construction of Body - Brass (Wetted Part)
  • Internal wetted parts-316 Stainless Steel
  • Dual Top and Bottom Process connections
  • Brass Snubber fittings mounted in bottom process connections
  • Optional O-rings Materials: Buna-N, Viton, and Ethylene Propylene.
  • For complete specifications see: Specificationsheet_115_116.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

Micro-Switch Specifications:

See Installation and Operation Manual : IM116DPIS 6” DIAL ONLY

Model 116 can be equipped with one or two independently adjustable SPDT switches which can be set on decreasing or on increasing pressure.

Minimum range requirement for Micro-switch is 80” H2O. The model 116 switch adjust screw and a switch lock screw is accessible after removal of the lens and bezel (removal of 4 screws). Interface to the snap acting micro-switch is via color coded 18 AWG flying leads and a ½” FNPT conduit connection. The assembly does not need power to operate.

  • 1 or 2 Independently adjustable switches
  • SPDT Outputs
  • 4 AMP @ 30 VDC
  • 3 AMP @ 240 VAC
  • 5 AMP @ 120 VAC
  • Adjustable from 3% to 95% F.S. Decreasing
  • CSA Listed Industrial Control Equipment

Additional Options:

  • ¾” FNPT Stainless Steel Stub Mount Bracket
  • Pipe Mounting Kit - 2" U-Bolt
  • Multiple 3-Valve Manifold Options
  • Oxygen Cleaning
  • CRN – Canadian Registration Number

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.